KAVAILABLERS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,General DescriptionFeatures
The MAX3160E/MAX3161E/MAX3162E are programma-♦Single Supply Operation from +3V to +5.5Vble RS-232/RS-485/RS-422 multiprotocol transceivers.The MAX3160E/MAX3161E are pin programmable as a♦ESD Protection
2Tx/2Rx RS-232 interface or a single RS-485/RS-422±15kV Human Body Model
transceiver. The MAX3162E is configured as a 2Tx/2Rx♦Pin-Selectable as 2Tx/2Rx RS-232 or Single RS-232 interface, and a single RS-485/RS-422 trans-RS-485/RS-422 (MAX3160E/MAX3161E)ceiver simultaneously.
♦2Tx/2Rx RS-232 and Single RS-485/RS-422The MAX3160E/MAX3161E/MAX3162E feature enhanced(MAX3162E)
electrostatic discharge (ESD) protection. All of the trans-♦Pin-Selectable RS-232/RS-485 Transmitter Slewmitter outputs and receiver inputs are protected to ±15kVRates Reduce EMI
using the Human Body Model.
♦10Mbps RS-485 and 1Mbps RS-232 Data RatesAll devices incorporate a proprietary low-dropout trans-♦Pin-Selectable Half-Duplex or Full-Duplex
mitter output stage, and an on-board dual charge pumpRS-485/RS-422 Operation (MAX3160E/MAX3161E)to allow RS-232- and RS-485-/RS-422-compliant perfor-♦RS-485/RS-422 True Fail-Safe Receiversmance from a +3V to +5.5V supply. The receivers feature♦10nA Shutdown Supply Current
true fail-safe circuitry that guarantees a logic-high receiv-er output when the receiver inputs are open or shorted.♦1/8-Unit Load Allows up to 256 Transceivers on the Bus
These devices also feature pin-selectable transmitterslew rates for RS-232 and RS-485/RS-422 modes. Slew-Ordering Information
rate limiting minimizes EMI and reduces reflectionscaused by improperly terminated cables, allowing error-P IN-P ACKAGEfree data transmission up to 250kbps. Disabling slew-rateP ARTT EMP RANGEPACKAGECODElimiting allows these devices to transmit at data rates up MAX3160ECAP0 °C to +70°C2 0 SSOPA 20-2to 10Mbps in RS-485/RS-422 mode and up to 1Mbps in MAX3160EEAP- 40°C to +85°C 20 SSOP A20-2RS-232 mode. The MAX3160E/MAX3161E/MAX3162Efeature a 10nA shutdown mode, short-circuit limiting, andM AX3161ECAG 0°C to +70°C 24 SSOP A24-3thermal shutdown circuitry to protect against excessiveM AX3161EEAG- 40°C to +85°C2 4 SSOPA 24-3power dissipation.
M AX3162ECAI 0°C to +70°C2 8 SSOPA 28-1The MAX3160E/MAX3162E offer a flow-through pin-M AX3162EEAI- 40°C to +85°C2 8 SSOPA 28-1out that facilitates board layout. The MAX3160E/MAX3161E/MAX3162E are available in tiny SSOP pack-ages and operate over the commercial and extendedTypical Operating Circuit
temperature ranges.
+3V TO +5.5V________________________Applications
2VCCPoint-of-Sales EquipmentPeripheralsRS-485/RS23211Industrial ControlsNetworkingMAX3160ETX13DI/T1IN16Z(B)/T1OUT5RS-232 to RS-485
Security Systems
RTSDE485/T2INY(A)/T2OUTInterface Converters
MAX310011156DB9RX128RO/R2OUTA/R2IN13CTS7R1OUTB/R1IN1014GNDFASTHDPLXSHDNSPI410129RJ45µPSHDNPin Configurations appear at end of data sheet.Selector Guide appears at end of data sheet.
________________________________________________________________Maxim Integrated Products
1
For price, delivery, and to place orders,please contact Maxim Distributionat 1-888-629-4642,or visit Maxim’s website at www.maxim-ic.com.
MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162E ABSOLUTE MAXIMUM RATINGS
VCCto GND..............................................................-0.3V to +6VV+ to GND................................................................-0.3V to +7VV- to GND.................................................................-7V to +0.3VV+ - V- (Note 1)....................................................................+13VInput Voltages
T1IN, T2IN, DI, DE485, RE485, TE232, RE232, SHDN,
FAST, HDPLX, RS485/RS232to GND..................-0.3V to +6VA, B, R1IN, R2IN to GND.................................................±25VOutput Voltages
T1OUT, T2OUT, Y, Z to GND (VCC= 0 or
SHDN= GND)..............................................................±13.2VT1OUT, T2OUT to GND (VCC= 5.5V and
SHDN= VCC).....................................................-13.2V to +9V R2OUT, R1OUT, RO to GND..................-0.3V to (VCC+ 0.3V)
Output Short-Circuit Duration
T1OUT, T2OUT, Y, Z..............................................ContinuousContinuous Power Dissipation (TA= +70°C)
20-Pin SSOP (derate 8.0mW/°C above +70°C)...........640mW24-Pin SSOP (derate 8.0mW/°C above +70°C)...........640mW28-Pin SSOP (derate 9.1mW/°C above +70°C)...........727mWOperating Temperature Ranges
MAX316_CA_......................................................0°C to +70°CMAX316_EA_...................................................-40°C to +85°CStorage Temperature Range.............................-65°C to +150°CJunction Temperature......................................................+150°CLead Temperature (soldering, 10s).................................+300°C
Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 2)PARAMETERDC CHARACTERISTICSSYMBOLCONDITIONSMAX3160E/MAX3161E, no load,RS-485/ RS-232 = GNDVCC Standby CurrentICCMAX3160E/MAX3161E, no load,RS-485/ RS-232 = VCCMAX3162E, no loadVCC Shutdown CurrentISHDNSHDN = GND, receiver inputs open orgroundedMINTYPMAXUNITS1.22.530.012.85.561µAmATRANSMITTER AND LOGIC INPUTS (DI, T1IN, T2IN, DE485, RE485, TE232, RE232, FAST, HDPLX, SHDN, RS-485/RS-232 )Logic-Input LowLogic-Input HighLogic-Input Leakage CurrentTransmitter Logic HysteresisReceiver Output-Voltage LowReceiver Output-Voltage HighReceiver Output Short-CircuitCurrentReceiver Output LeakageCurrentVILVIHIINLVHYSVOLVOHIOSRIOZRIOUT = 2.5mAIOUT = -1.5mA0 ≤ VO ≤ VCCReceivers disabledVCC - 0.6±20±0.05±85±1VCC = +3.3VVCC = +5V2.02.4±0.010.50.4±10.8VVµAVVVmAµA RS-232 AND RS-485/RS-422 RECEIVER OUTPUTS (R1OUT, R2OUT, RO)2_______________________________________________________________________________________元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 2)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSRS-232 RECEIVER INPUTS (R1IN, R2IN)Input Voltage Range-25+25VLogic-Input Low0.8Logic-input HighVCC = +3.3V2.0VVCC = +5V2.4Input Hysteresis0.5VInput ResistanceVCC = +3.0V to 5.5V357VkΩCC = 061116RS-485/RS-422 RECEIVER INPUTS (Note 3)MAX3160E48Input ResistanceRIN-7V < VCM < +12VMAX3161E/MAX3162E96kΩMAX3160EVCM = +12V0.25Input CurrentIINVCM = -7V-0.15MAX3161E/MAX3162EVCM = +12V0.125mAVCM = -7V-0.075Input Differential ThresholdVTH-7V ≤ VCM ≤ +12V-200-50mVInput Hysteresis∆VTH30mVRS-232 TRANSMITTER OUTPUTS (T1OUT, T2OUT)Output Voltage SwingBoth transmitter outputs loaded with 3kΩto GND±5±5.4VOutput ResistanceVCC = V+ = V- = 0, T_OUT = ±2V30010MΩOutput Short-Circuit CurrentISCT_OUT = GND±30±60mAVOUT = ±9VMAX3160E±125Output Leakage CurrentIOTE232 = GND or SHDN =MAX3161E±25µAGNDMAX3162E±25RS-485/RS-422 TRANSMITTER OUTPUTS (Y, Z)R = 27Ω(RS-485)1.5Differential Output VoltageVODFigure 1R = 50ΩV(RS-422)2Change in Magnitude ofDifferential Output Voltage for|∆VOD|R = 27Ω or 50Ω, Figure 10.2VComplementary Output StatesCommon-Mode Output VoltageVOCR = 27Ω or 50Ω, Figure 13VChange in Magnitude ofCommon-Mode Output Voltagefor Complementary Output|∆VOC|R = 27Ω or 50Ω, Figure 10.2VStates_______________________________________________________________________________________3
MAX3160E/MAX3161E/MAX3162E 元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162E ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 2)PARAMETEROutput Short-Circuit CurrentOutput Leakage CurrentSYMBOLISCIOCONDITIONSVY or VZ = -7V to +12VVY or VZ = -7V or +12V,DE485 = GND or SHDN =GNDRL = 3kΩ, CL = 1000pFtTSKEWRL = 3kΩ, CL = 150pF, Figure 6VCC = +3.3V, TA = +25°C,RL = 3kΩ to 7kΩ,measured from +3.0V to-3.0V or -3.0V to +3.0VCL = 150pFto 1000pFCL = 150pFto 2500pF64MAX3160EMAX3161EMAX3162E2502530V/µs30MINTYPMAX±250±125±25±25kbpsnsµAUNITSmARS-232 TRANSMITTER TIMING CHARACTERISTICS (SLOW MODE, FAST = GND, 250kbps, one transmitter switching)Maximum Data RateTransmitter SkewTransition-Region Slew Rate RS-232 TRANSMITTER TIMING CHARACTERISTICS (FAST MODE, FAST = VCC, 1Mbps, one transmitter switching)VCC = +3V to +4.5V, RL = 3kΩ, CL = 250pFMaximum Data RateTransmitter SkewtTSKEWVCC = +4.5V to +5.5V, RL = 3kΩ,CL = 1000pFRL = 3kΩ, CL = 150pF, Figure 6VCC = +3.3V, TA = +25°C, RL= 3kΩ to 7kΩ, CL = 150pF to1000pF, measured from +3.0Vto -3.0V or -3.0V to +3.0VtPHL,tPLHtRZL,tRZHtRLZ,tRHZtRSKEWtDPHL,tDPLHtDR,tDFtDSKEWtDZH, tDZLtDLZ, tDHZMAX3160EMAX3161EMAX3162E13241110150V/µs150MbpsnsTransition-Region Slew Rate RS-232 RECEIVER TIMING CHARACTERISTICSReceiver Propagation DelayReceiver Output Enable TimeReceiver Output Disable TimeReceiver SkewDifferential Driver PropagationDelayDifferential Driver Rise and FallTimeDifferential Driver PropagationDelay SkewDriver Output Enable TimeDriver Output Disable TimeR_IN to R_OUT, CL = 15pF, Figure 5CL = 50pF, Figures 2, 10, MAX3162ECL = 15pF, Figures 2, 10, MAX3162ECL = 50pF, Figure 50.15200200100µsnsnsns RS-485/RS-422 DRIVER TIMING CHARACTERISTICS (SLOW MODE, FAST = GND, 250kbps)RDIFF = 54Ω, CL = 50pF, Figures 3, 7RDIFF = 54Ω, CL = 50pF, Figures 3, 7RDIFF = 54Ω, CL = 50pF, Figures 3, 7CL = 50pF, Figures 4, 8CL = 50pF, Figures 4, 8400200200200400400800800200900400nsnsnsnsns4_______________________________________________________________________________________
元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3V to +5.5V, C1–C4 = 0.1µF when tested at +3.3V ±10%; C1 = 0.047µF and C2, C3, C4 = 0.33µF when tested at +5V±10%;TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 2)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSRS-485/RS-422 DRIVER TIMING CHARACTERISTICS FAST MODE, FAST = VCC, 10Mbps)Differential Driver PropagationtDPHL,DelaytDPLHRDIFF = 54Ω, CL = 50pF, Figures 3, 760120nsDifferential Driver Rise and FallTimestDR, tDFRDIFF = 54Ω, CL = 50pF, Figures 3, 71025nsDifferential Driver PropagationDelay SkewtDSKEWRDIFF = 54Ω, CL = 50pF, Figures 3, 710nsDriver Output Enable TimetDZH,tDZLCL = 50pF, Figures 4, 8400900nsDriver Output Disable TimetDHZ,tDLZCL = 50pF, Figures 4, 8200400nsRS-485/RS-422 RECEIVER TIMING CHARACTERISTICSReceiver Propagation DelaytRPLH,tRPHLCL = 15pF, Figures 9, 1180150nsReceiver Propagation DelaySkewtRSKEWCL = 15pF, Figures 9, 11110nsReceiver Output Enable TimetRZL, tRZHMAX3162E, CL = 50pF, Figures 2, 10100nsReceiver Output Disable TimetRLZ, tRHZMAX3162E, CL = 15pF, Figures 2, 10100nsESD PROTECTIONR_IN, T_OUT, A, B, Y, ZHuman Body Model±15kVNote 2:All currents into the device are positive. All currents out of the device are negative.Note 3:Applies to A, B for MAX3162E and MAX3160E/MAX3161E with HDPLX = GND, or Y, Z for MAX3160E/MAX3161E with
HDPLX = VCC.
Typical Operating Characteristics
(VCC= +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩtoground, TA= +25°C, unless otherwise noted.)
RS-232 TRANSMITTER OUTPUT VOLTAGERS-232 TRANSMITTER OUTPUT VOLTAGERS-232 TRANSMITTER SLEW RATEvs. LOAD CAPACITANCE (FAST = GND)
vs. LOAD CAPACITANCE (FAST = VCC)
vs. LOAD CAPACITANCE (FAST = GND)
10.00110.00218
3000cccooott EDATA RATE = 1Mbpst EE000)6)66V13V1161(7.50X(7.5033 A XEMEAGGMAA14RISINGXAMT5.00T5.00LL)OOsVVµ12 /T2.50T2.50VUU( PPET0TT10FALLINGUUAOO0R RRW8E-2.50EETTLTT-2.50SIIMM6SNA-5.00SNA-5.004RRT-7.50
T-7.50
2-10.00
-10.00
0
0
1000
2000
3000
4000
5000
0
500
1000
1500
2000
2500
010002000300040005000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
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MAX3160E/MAX3161E/MAX3162E 元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162E Typical Operating Characteristics (continued)(VCC= +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩtoground, TA= +25°C, unless otherwise noted.)
RS-232 TRANSMITTER SLEW RATEvs. LOAD CAPACITANCE (FAST = VCC)
MAX3160E toc04OPERATING SUPPLY CURRENTvs. LOAD CAPACITANCE WHENTRANSMITTING DATA (RS-232 MODE)
DATA RATE = 1MbpsMAX3160E to05MAX3160E/MAX3161ENO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
MAX3160E toc0611010090SLEW RATE (V/µs)807060504030201000
400
800
1200
1600
FALLINGRISING6050SUPPLY CURRENT (mA)40
3.02.5SUPPLY CURRENT (mA)2.01.51.00.50
RS-485 MODEDATA RATE = 250kbps3020
DATA RATE = 20kbps100
RS-232 MODE2000010002000300040005000-40-1510356085
LOAD CAPACITANCE (pF)LOAD CAPACITANCE (pF)TEMPERATURE (°C)
SHUTDOWN CURRENTvs. TEMPERATURE
MAX3160E toc07RS-485/RS-422 OUTPUT CURRENTvs. DRIVER-OUTPUT LOW VOLTAGE
MAX3160E toc08RS-485/RS-422 OUTPUT CURRENTvs. DRIVER-OUTPUT LOW VOLTAGE
MAX3160E toc09250140120OUTPUT CURRENT (mA)10080604020
140120OUTPUT CURRENT (mA)100806040200
SHUTDOWN CURRENT (nA)200
150
100
50
0-40
-15
10
35
60
85
TEMPERATURE (°C)
00
2
4
6
8
10
12
OUTPUT LOW VOLTAGE (V)
-7-5-3-1135
OUTPUT LOW VOLTAGE (V)
RS-485/RS-422 DRIVER OUTPUT CURRENTvs. DIFFERENTIAL OUTPUT VOLTAGE
MAX3160E toc10RS-485/RS-422 DRIVER DIFFERENTIAL
OUTPUT vs. TEMPERATURE
2.92.8OUTPUT VOLTAGE (V)2.72.62.52.42.32.22.12.0
RDIFF = 100ΩFIGURE 1MAX3160E toc11RECEIVER OUTPUT CURRENT vs. RECEIVER-OUTPUT LOW VOLTAGE
MAX3160E toc121009080OUTPUT CURRENT (mA)7060504030201000
0.5
1.0
1.5
2.0
2.5
3.0
3.5
3.03025OUTPUT CURRENT (mA)20151050
4.0-40-1510356085
00.51.01.52.02.53.03.5
OUTPUT LOW VOLTAGE (V)TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
6_______________________________________________________________________________________
元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,RS-232/RS-485/RS-422 Multiprotocol Transceivers
Typical Operating Characteristics (continued)(VCC= +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩtoground, TA= +25°C, unless otherwise noted.)
RECEIVER OUTPUT CURRENTvs. RECEIVER-OUTPUT HIGH VOLTAGE
MAX3160E toc13MAX3160E/MAX3161E/MAX3162E RS-485/RS-422 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3160E toc14RS-485/RS-422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (FAST = VCC)
CL = 50pFRDIFF = 54ΩDATA RATE = 10MbpsRISINGFALLINGMAX3160E toc151412OUTPUT CURRENT (mA)10864200
0.5
1.0
1.5
2.0
2.5
3.0
10090PROPAGATION DELAY (ns)80706050403020100
RISINGFALLING5045PROPAGATION DELAY (ns)4035302520
3.5-40-1510356085-40-1510356085
OUTPUT-HIGH VOLTAGE (V)TEMPERATURE (°C)TEMPERATURE (°C)
RS-485/RS-422 DRIVER PROPAGATION DELAY
vs. TEMPERATURE (FAST = GND)
MAX3160E toc16RS-485/RS-422 DRIVER PROPAGATION
(FAST = VCC, 10Mbps)
CL = 50pFRDIFF = 54ΩRS-485/RS-422 DRIVER PROPAGATION
(FAST = GND, 250kbps)
CL = 50pFRDIFF = 54ΩMAX3160E toc17MAX3160E toc18400350PROPAGATION DELAY (ns)300250200150100
-40
-15
10
35
60
CL = 50pFRDIFF = 54ΩDATA RATE = 250kbpsRISINGDI2V/div
DI2V/div
FALLINGVY - VZ2V/div
VY - VZ2V/div
85
20ns/div
1.0µs/div
TEMPERATURE (°C)
I-V OUTPUT IMPEDANCE CURVEIN RS-232 SHUTDOWN MODE
MAX3160E toc19RS-485/RS-422 RECEIVER PROPAGATION
(FAST = VCC, 5Mbps)
MAX3160E toc20RS-485/RS-422 RECEIVER PROPAGATION
(FAST = VCC, 5Mbps)
MAX3160E toc21400200OUTPUT CURRENT (µA)0-200-400-600-800-1000
-20
-15
-10
-5
0
5
10
15
CL = 15pFVY - VZ2V/div
CL = 50pFRDIFF = 54ΩDE4852V/div
RO2V/div
VY - VZ2V/div
20
4ns/div100ns/div
OUTPUT VOLTAGE (V)
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元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol Transceivers62ETypical Operating Characteristics (continued)(VCC= +3.3V, 250kbps data rate, CBYPASS, C1, C2, C3, C4 = 0.1µF, all RS-232 transmitters (RS-232 mode) loaded with 3kΩtoground, TA= +25°C, unless otherwise noted.)
13XAM/E1613XAM/E0613XAM8MAX3160E
MAX3160E
RS-232 TRANSMITTER PROPAGATION
RS-232 TRANSMITTER PROPAGATION
(FAST = GND, 250kbps)
MAX3160E toc22(FAST = VCC, 250kbps)
MAX3160E toc23CL = 1000pFCRΩL = 150pFL = 7kRL = 7kΩDIDI2V/div
2V/div
T_OUTT_OUT5V/div
5V/div
1.0µs/div
1.0µs/div
MAX3161E/MAX3162E
MAX3161E/MAX3162E
RS-232 TRANSMITTER PROPAGATION
RS-232 TRANSMITTER PROPAGATION
(FAST = GND, 250kbps)
(FAST = VCC, 250kbps)
MAX3160E toc24MAX3160E toc25CL = 1000pFCL = 150pFRL = 7kΩRL = 7kΩDIDI2V/div
2V/div
T_OUTT_OUT5V/div
5V/div
1.0µs/div
1.0µs/div
TRANSMITTER OUTPUT VOLTAGESUPPLY CURRENT vs. SUPPLY VOLTAGEvs. SUPPLY VOLTAGE (FAST = GND)
WITH RS-232 RUNNING (FAST = GND)
10.00621272INPUTS AT VccCC AND GNDoott EE00)66V7.5011(2 TRANSMITTERS LOADED WITH 3kΩ33 XXEA10AGMMA)T5.00ALOm(V T8T2.50NUEPRTRU0UOC6 RYELTPT-2.50PIMU4SSN-5.00ART-7.50
2CL = 50pFRL = 3kΩ1 TRANSMITTER AT 250kbps-10.00
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,Pin Description
PINMAX3160EMAX3161EMAX3162ENAMEFUNCTION111C1+Positive Terminal of the Positive Flying Capacitor222VCCPositive Supply Voltage333C1-Negative Terminal of the Positive Flying Capacitor444GNDGround—55T1OUTRS-232 Driver OutputInverting RS-485/RS-422 Driver Output in Full-Duplex Mode5——Z(B)/T1OUT(and Inverting RS-485/RS-422 Receiver Input in Half-DuplexMode)/RS-232 Driver Output——6ZInverting RS-485/RS-422 Driver OutputInverting RS-485/RS-422 Driver Output in Full-Duplex Mode—6—Z(B)(and Inverting RS-485/RS-422 Receiver Input in Half-DuplexMode)Noninverting RS-485/RS-422 Driver Output in Full-Duplex6——Y(A)/T2OUTMode (and Noninverting RS-485/RS-422 Receiver Input inHalf-Duplex Mode)/RS-232 Driver Output——7YNoninverting RS-485/RS-422 Driver OutputNoninverting RS-485/RS-422 Driver Output in Full-Duplex—7—Y(A)Mode (and Noninverting RS-485/RS-422 Receiver Input inHalf-Duplex Mode)799R1OUTRS-232 Receiver Output—88T2OUTRS-232 Driver Output810—RO/R2OUTRS-485/RS-422 Receiver Output/RS-232 Receiver Output91113SHDNActive-Low Shutdown-Control Input. Drive SHDN low to shutdown transmitters and charge pump.——10R2OUTRS-232 Driver OutputTransmitter Speed-Select Input. Select slew-rate limiting for101214FASTRS-232 and RS-485/RS-422. Slew-rate limits with a logic-levellow.——11RORS-485/RS-422 Receiver OutputPin-Selectable Mode Functionality Input. Operates as1113—RS - 485/RS - 232RS-485/RS-422 with a logic-level high; operates as RS-232with a logic-level low.——12RE485RS-485/RS-422 Receiver Enable Input. Logic-level low enablesRS-485/RS-422 receivers.Pin-Selectable Mode Functionality Input. Operates in full-1214—HDPLXduplex mode when low; operates in half-duplex mode whenhigh._______________________________________________________________________________________9
MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162EPin Description (continued)
PINMAX3160E1314——15——16—17—181920————MAX3161E———1519—1620172118222324————MAX3162E——1517—1618—19252026272821222324NAMEA/R2INB/R1INRE232ADE485/T2INTE232BDI/T1INR2INV-R1INC2-C2+V+T2INDE485DIT1INFUNCTIONNoninverting RS-485/RS-422 Receiver Input/RS-232 ReceiverInputInverting RS-485/RS-422 Receiver Input/RS-232 Receiver InputRS-232 Receiver Enable. Logic-level low enablesRS-232 receivers.Noninverting RS-485/RS-422 Receiver InputRS-485/RS-422 Driver Enable/RS-232 Driver InputRS-232 Transmitter Output EnableInverting RS-485/RS-422 Receiver InputRS-485/RS-422 Driver Input/RS-232 Driver InputRS-232 Receiver InputNegative Charge-Pump RailRS-232 Receiver InputNegative Terminal of the Negative Flying CapacitorPositive Terminal of the Negative Flying CapacitorPositive Charge-Pump RailRS-232 Driver InputRS-485/RS-422 Driver Enable InputRS-485/RS-422 Driver InputRS-232 Driver Input10______________________________________________________________________________________
元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,MAX3160E Functional Diagram
RS-232 MODERS-485 MODEVCCVCC1C1+V+201C1+V+20C1C3C1C22VCCC2+192VCCC2+CHARGEC2CHARGE19C33C1-PUMPC2-C1-PUMPC2-18318CBYPASSCBYPASS4GNDV-174GNDV-17C4C4ZNOI16RS-2325NOT1I16DTDTSCOUTPUTSSCLOGICRS-4855EEEETYTDLOGICOINPUTS6ORRT2PP15INPUTSOUTPUTS6DE485157R1NNOOBI147I14LOGICDTDTOUTPUTSSCSCRS-485EERS-232EET8R2TOOINPUTSRRAP13INPUTSLOGICOUTPUT8R0RP139SHDNHDPLX129SHDNMAX3160EHDPLX12LOGICINPUT10FASTRS-485/RS-2321110FASTMAX3160ERS-485/RS-23211______________________________________________________________________________________11
MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162EMAX3161E Functional Diagram
RS-232 MODEVCC1C123CBYPASS4RS-232OUTPUT5ESDPROTECTION67RS-232OUTPUT89LOGICOUTPUTS1011SHDN12FASTGNDT1V-21C4201918171615HDPLX14RS-232INPUTS56RS-485OUTPUTS789LOGICOUTPUT10R0RC1+VCCC1-CHARGEPUMPV+C2+C2-24C323C2223CBYPASS4C12VCC1C1+VCCC1-GNDRS-485 MODEV+C2+CHARGEPUMPC2-V-2423C2222120ESDPROTECTIONZY19DDE4851817ESDPROTECTIONBA16RS-485INPUTS1514LOGICINPUTC3C4LOGICINPUTSLOGICINPUTST2R1R2ESDPROTECTIONMAX3161E11SHDN12FASTMAX3161EHDPLXRS-485/RS-23213RS-485/RS-2321312______________________________________________________________________________________
元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,MAX3162E Functional DiagramTest Circuits
YRVCC1C1+V+28VODC1C32VCCC2+RVOCCHARGE273C1-PUMPC2-C2Z26CBYPASS4GNDV-25Figure 1. RS-485/RS-422 Driver DCTest Load
RS-232T1C4OUTPUT524RECEIVERTEST POINT1kΩ6ZVNCCOOUTPUTIRS-485DT23CLS1COUTPUTSSEE1k7YTDLOGICORDE485INPUTSP22RS-232T2S2OUTPUT8211R1Figure 2. RS-485/RS-422 and RS-232 Receiver Enable/Disable920Timing Test Load
RS-232LOGICR2INPUTSNOUTPUTS10O19IDTSCEE11TOBROR183VRPRS-485DE485LOGICRE485AINPUTSINPUT1217DIY13SHDN16VODRDIFFCLMAX3162ETE232LOGICZ14FASTRE-23215INPUTSFigure 3. RS-485/RS-422 Driver Timing Test CircuitVCCOUTPUT500ΩS1UNDER TESTCLS2Figure 4. RS-485/RS-422 Driver Enable/Disable Timing Test Load
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MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162ETest Circuits(continued)
+3V0VINPUT1.5V1.5V+3VINPUT1.5V0V1.5VOUTPUT50%50%GNDVCCOUTPUTV+0VV-tPHLtRSKEW = | tPLH - tPHL |tPLHtPLHtSKEW = | tPLH - tPHL |tPHLFigure 5. RS-232 Receiver Propagation-Delay Timing
3VDI0ZYVOVDIFF0-VOVO1/2 VO10%tDR90%VDIFF = Vy - Vz90%1.5VtDPLHtDPHL1.5V1/2 VOFigure 6. RS-232 Transmitter Propagation-delay Timing3VDE48501.5V1.5VY, ZVOLY, Z10%0tDZLtDLZVOL + 0.5V2.3VOUTPUT NORMALLY LOWOUTPUT NORMALLY HIGH2.3VtDZHtDHZVOH - 0.5VtDFtDSKEW = | tDPLH - tDPHL |Figure 7. RS-485/RS-422 Driver Propagation Delays
Figure 8. RS-485/RS-422 Driver Enable and Disable Times
RO1V-1VVOHVOLABVCC/2tRPHLINPUTtRSKEW = | tRPLH - tRPHL |OUTPUTtRPLHVCC/23VRE232 OR RE48501.5V1.5VVCCROtRZLtRLZVOL + 0.5V1.5VOUTPUT NORMALLY LOWOUTPUT NORMALLY HIGHRO01.5VtRZHtRHZVOH - 0.5VFigure 9. RS-485/RS-422 Receiver Propagation Delays
Figure 10. MAX3162 RS-485/RS-422 and RS-232 ReceiverEnable and Disable Times
BVIDARROCLFigure 11. RS-485/RS-422Receiver Propagation Delays TestCircuit14
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元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,RS-232/RS-485/RS-422 Multiprotocol Transceivers
Detailed Description
The MAX3160E/MAX3161E/MAX3162E +3V to +5.5V,multiprotocol transceivers can be pin-configured in anumber of RS-232 and RS-485/RE-422 interface combi-nations. These circuit configurations are ideal for thedesign of RS-232 to RS-485 converters, multiprotocolbuses, or any application that requires both RS-232 andRS-485 transceivers. The slew rate of these devices ison-the-fly pin selectable, allowing reduced EMI datarates, or up to 10Mbps RS-485 communications. Powerconsumption can be reduced to 10nA by using theshutdown function, but the RS-232 receivers remainactive allowing other devices to query the interface con-troller. A flow-through pinout and the space-savingSSOP packages (available in commercial and extendedtemperature ranges) facilitate board layout.
MAX3161E
The MAX3161E is a 2TX/2RXRS-232 transceiver in RS-232 mode or a single RS-485/RS-422 transceiver inRS-485 mode. When in RS-485 mode, the unused RS-232 transmitter and receiver outputs are disabled. Whenin RS-232 mode, the RS-485 transmitter outputs are dis-abled and the RS-232 receiver inputs are 5kΩto GND.The RS-485 receiver inputs are always 1/8-unit load.Logic lines are shared between the two protocols and areused for signal inputs and as an RS-485 driver enable.MAX3162E
The MAX3162E is a 2Tx/2Rx RS-232 transceiver and asingle RS-485/RS-422 transceiver simultaneously. Alldrivers, receivers, and transmitters can be enabled ordisabled by pin selection. All outputs are high-imped-ance when not activated. RS-232 receiver inputs are5kΩwhen enabled, and RS-485 receiver inputs are 1/8-unit load.
MAX3160E/MAX3161E/MAX3162EDevice Selection
The MAX3160E/MAX3161E/MAX3162E contain RS-232transceivers and an RS-485/RS-422 transceiver. Theprimary difference between the devices is the multi-plexing of the I/O ports.
The MAX3160E has common transmitter outputs andreceiver inputs for its RS-232 and RS-485/RS-422 trans-ceivers, and common digital I/O ports. The MAX3160Eis optimized for multiprotocol operation on a singleinterface bus and comes in a 20-pin SSOP package.The MAX3161E has separate transmitter outputs andreceiver inputs for its RS-232 and RS-485/RS-422 trans-ceivers, and common digital I/O ports. The MAX3161E isoptimized for multiplexing a single UART across two inter-face buses and is available in a 24-pin SSOP package.Fast-Mode Operation
The FAST control input is used to select the slew-ratelimiting of the RS-232 transmitters and the RS-485/RS-422 drivers. With FAST unasserted, the RS-232transmitters and the RS-485/RS-422 driver are slew-ratelimited to reduce EMI. RS-232 data rates up to 1Mbpsand RS-485/RS-422 data rates up to 10Mbps are possi-ble when FAST is asserted. FAST can be changed dur-ing operation without interrupting data communications.
Half-Duplex RS-485/RS-422 Operation
Asserting HDPLX places the MAX3160E/MAX3161E inhalf-duplex mode. The RS-485 receiver inputs are inter-nally connected to the driver outputs. To receive The MAX3162E has separate transmitter outputs andRS-485 data, disable the RS-485 outputs by drivingreceiver inputs for its RS-232 and RS-485/RS-422 trans-DE485 low. HDPLX has no affect on RS-232 operation.
ceivers, and separate digital I/O ports. The MAX3162Eis optimized for protocol translation between two inter-Low-Power Shutdown
face buses and comes in a 28-pin SSOP package.
The MAX3160E/MAX3161E/MAX3162E have an active-See Tables 1–12, the Functional Diagrams, and the fol-low shutdown control input, SHDN. When SHDNisdri-lowing descriptions for details on each device.
ven low, the charge pump and transmitters are shutdown and supply current is reduced to 10nA. The MAX3160E
RS-232 receiver outputs remain active if in RS-232The MAX3160E is a 2TX/2RXRS-232 transceiver in mode. The charge-pump capacitors must beRS-232 mode, capable of RS-232-compliant communi-recharged when coming out of shutdown before resum-cation. Assertion of RS-485/RS-232converts the deviceing operation in either RS-232 or RS-485/RS-422modeto a single RS-485 transceiver by multiplexing the RS-(Figure 12).
232 I/O ports to an RS-485 driver and receiver pair. Thelogic inputs now control the driver input and the driverDual Charge-Pump Voltage Converter
enable. One logic output carries the RS-485 receiver out-The MAX3160E/MAX3161E/MAX3162E’s internal powerput, and the other is tri-stated. The receiver input imped-supply consists of a regulated dual charge pump thatance is dependent on the device mode and is 1/4-unitprovides output voltages of +5.5V (doubling chargeload for RS-485 operation and 5kΩfor RS-232 operation.
pump), and -5.5V (inverting charge pump), for inputvoltages (VCC) over the +3.0V to +5.5V range. Thecharge pumps operate in a discontinuous mode. If the
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元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162Emagnitude of either output voltage is less than +5.5V,the charge pumps are enabled. If the magnitude ofboth output voltages exceeds +5.5V, the chargepumps are disabled. Each charge pump requires a fly-ing capacitor (C1, C2) and a reservoir capacitor (C3,C4) to generate the V+ and V- supplies (see theFunctional Diagrams).
The receivers convert RS-232 signals to CMOS-logic out-put levels. All receivers have inverting outputs thatremain active in shutdown. The MAX3160E/MAX3161E/MAX3162E permit their receiver inputs to be driven to±25V. Floating receiver input signals are pulled toground through internal 5kΩresistors, forcing the out-puts to a logic-high. The MAX3162E has transmitter andreceiver enable pins that allow its outputs to be tri-stated.
RS-485/RS-422 Transceivers
The MAX3160E/MAX3161E/MAX3162E RS-485/RS-422transceivers feature fail-safe circuitry that guarantees alogic-high receiver output when the receiver inputs areopen or shorted, or when they are connected to a ter-minated transmission line with all drivers disabled (seethe Fail-Safe Section). The MAX3160E/MAX3161E/MAX3162E also feature pin-selectable reduced slew-rate drivers that minimize EMI and reduce reflectionscaused by improperly terminated cables, allowingerror-free data transmission up to 250kbps The trans-mitters can operate at speeds up to 10Mbps with theslew-rate limiting disabled. Drivers are short-circuit cur-rent limited and thermally limited to protect themagainst excessive power dissipation. Half-duplex com-munication is enabled by driving HDPLX high(MAX3160E/MAX3161E.)
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures areincorporated on all pins to protect against ESD encoun-tered during handling and assembly. The MAX3160E/MAX3161E/MAX3162E receiver inputs and transmitteroutputs have extra protection against static electricityfound in normal operation. Maxim’s engineers developedstate-of-the-art structures to protect these pins against±15kV ESD, without damage. After an ESD event, theMAX3160E/MAX3161E/MAX3162E continue workingwithout latchup.
The receiver inputs and transmitter outputs are charac-terized for ±15kV ESD protection using the HumanBody Model
ESD Test Conditions
ESD performance depends on a number of conditions.Contact Maxim for a reliability report that documentstest setup, methodology, and results.
Human Body Model
Figure 13a shows the Human Body Model, and Figure13b shows the current waveform it generates when dis-charged into a low impedance. This model consists ofa 100pF capacitor charged to the ESD voltage of inter-est, which is then discharged into the device through a1.5kΩresistor.
Fail-Safe
The MAX3160E/MAX3161E/MAX3162E guarantee alogic-high RS-485 receiver output when the receiverinputs are shorted or open, or when they are connectedto a terminated transmission line with all drivers dis-abled. This is done by having the receiver thresholdbetween -50mV and -200mV. If the differential receiverinput voltage (A-B) is greater than or equal to -50mV,RO is logic-high. If A-B is less than or equal to -200mV,RO is logic-low. In the case of a terminated bus with alltransmitters disabled, the receiver’s differential inputvoltage is pulled to 0 by the termination. This results ina logic-high with a 50mV minimum noise margin.
RS-232 Transceivers
The MAX3160E/MAX3161E/MAX3162E RS-232 trans-mitters are inverting-level translators that convertCMOS-logic levels to ±5V EIA/TIA-232-compliant lev-els. The transmitters are guaranteed at a 250kbps datarate in slew-rate limited mode (FAST = GND) withworst-case loads of 3kΩin parallel with 1000pF. Datarates up to 1Mbps can be achieved by asserting FAST. When powered down or in shutdown, the MAX3160E/MAX3161E/MAX3162E outputs are high impedanceand can be driven to ±13.2V. The transmitter inputs donot have pullup resistors. Connect unused inputs toground or VCC.
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元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,SHDNRCRD 5V/div1MΩ1.5kΩT1OUTCHARGE-CURRENTDISCHARGE2V/divLIMIT RESISTORRESISTANCEGNDHIGH-T2OUTVOLTAGECSTORAGEDEVICE2V/divDC100pFsCAPACITORUNDERTESTSOURCE40µs/divFigure 12. RS-232 Transmitter Outputs when Exiting ShutdownFigure 13a. Human Body ESD Test Model
Machine Model
The Machine Model for ESD testing uses a 200pF stor-age capacitor and zero-discharge resistance. It mimicsIP 100%IrPEAK-TO-PEAK RINGINGthe stress caused by handling during manufacturing and90%(NOT DRAWN TO SCALE)assembly. Of course, all pins (not just RS-485 inputs)require this protection during manufacturing. Therefore,AMPERESthe Machine Model is less relevant to the I/O ports than36.8%are the Human Body Model and IEC 1000-4-2.
Applications Information
10%00tRLTIMECapacitor Selection
tDLThe capacitor type used for C1–C4 is not critical forCURRENT WAVEFORMproper operation; polarized or nonpolarized capacitorscan be used. Ceramic chip capacitors with an X7Rdielectric provide the best combination of performance,Figure 13b. Human Body Model Current Waveform
cost, and size. The charge pump requires 0.1µFcapacitors for 3.3V operation. For other supply volt-ages, see Table 13for required capacitor values. Dousually rises at low temperatures, influences thenot use values smaller than those listed in Table 13.amount of ripple on V+ and V-.
Increasing the capacitor values reduces ripple on thetransmitter outputs and slightly reduces power con-Power-Supply Decoupling
sumption. C2, C3, and C4 can be changed withoutIn applications that are sensitive to power-supply noise,changing C1’s value. However, do not increase C1decouple VCCto ground with a capacitor of the samewithout also increasing the values of C2, C3, C4,value as reservoir capacitors C2, C3, and C4. Connectand Cthe bypass capacitor as close to the IC as possible.
BYPASSto maintain the proper ratios to theother capacitors.
When using the minimum required capacitor values,make sure the capacitance value does not degradeexcessively with temperature or voltage. This is typicalof Y5V and Z5U dielectric ceramic capacitors. If indoubt, use capacitors with a larger nominal value. Thecapacitor’s equivalent series resistance (ESR), which
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MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162ERS-232 Transmitter Outputs
when Exiting Shutdown
Figure 12shows two transmitter outputs when exitingshutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low). Eachtransmitter is loaded with 3kΩin parallel with 1000pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note thatthe transmitters are enabled only when V- exceedsapproximately -3V.
VCCCBYPASSC1+C1 C1-C2+C2 C2-T_ INVCCV+C3MAX3160EMAX3161EMAX3162EV-C4High Data Rates
The MAX3160E/MAX3161E/MAX3162E maintain the RS-232 ±5V required minimum transmitter output voltageeven at high data rates. Figure 14shows a transmitterloopback test circuit. Figure 15 shows a loopback testresult at 250kbps, and Figure 16shows the same test at1Mbps. Figure 15 demonstrates a single slew-rate limit-ed transmitter driven at 250kbps (FAST = GND) into anRS-232 load in parallel with 1000pF. Figure 17 shows asingle transmitter driven at 1Mbps (FAST asserted),loaded with an RS-232 receiver in parallel with 1000pF.These transceivers maintain the RS-232 ±5V minimumtransmitter output voltage at data rates up to 1Mbps.
T_ OUTR_ OUTR_ IN1000pF5kVCCSHDNGNDFigure 14. Loopback Test Circuit
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ(one-unit load), and the standard driver can drive up to32-unit loads. The MAX3160E has a 1/4-unit loadreceiver input impedance (48kΩ), allowing up to 128transceivers to be connected in parallel on one com-munication line. The MAX3161E/MAX3162E have a 1/8-unit load receiver input impedance (96kΩ), allowing upto 256 transceivers to be connected in parallel on onecommunication line. Any combination of these devicesand/or other RS-485 transceivers with a total of 32-unitloads or fewer can be connected to the line.
The MAX3160E/MAX3161E/MAX3162E inputs are pro-tected to RS-232 levels of ±25V for the receiver inputsand ±13V for the transmitter/driver outputs. This pro-vides additional protection for the RS-485 transceiversagainst ground differential or faults due to miswiring.
RS-485/RS-422 Reduced
EMI and Reflections
The MAX3160E/MAX3161E/MAX3162E can be config-ured for slew-rate limiting by pulling FAST low. This mini-mizes EMI and reduces reflections caused by improperlyterminated cables. Operation in slew-rate limited modereduces the amplitudes of high-frequency harmonics.
RS-485/RS-422
Driver Output Protection
Two mechanisms prevent excessive output current andpower dissipation caused by faults or by bus con-tention. The first, a foldback current limit on the outputstage, provides immediate protection against short cir-cuits over the whole common-mode voltage range (seethe Typical Operating Characteristics). The second, athermal shutdown circuit, forces the driver outputs intoa high-impedance state if the die temperature becomesexcessive, typically over +150°C.
RS-485/RS-422 Line Length vs. Data
Length
The RS-485/RS-422 standard covers line lengths up to4000ft. For line lengths greater than 4000ft, use therepeater application shown in Figure 17.
RS-232/RS-485 Protocol Translator
Figure 18shows the MAX3162E configured as an RS-232/RS-485 protocol translator. The direction oftranslation is controlled through the RTS signal (R1IN).The single-ended RS-232 receiver input signal is trans-lated to a differential RS-485 transmitter output.Similarly, a differential RS-485 receiver input signal istranslated to a single-ended RS-232 transmitter output.RS-232 data received on R2INis transmitted as an RS-485 signal on Z and Y. RS-485 signals received on Aand B are transmitted as an RS-232 signal on T1OUT.
Protection Against Wiring Faults
EIA/TIA-485 standards require a common input voltagerange of -7V to +12V to prevent damage to the device.
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元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,TINTINRTOUTTOUTOUT
5V/div
5V/div
1µs/div
ROUTROUT
1µs/div200ns/div
Figure 15. MAX3161E/MAX3162E RS-232 Loopback Test ResultFigure 16. MAX3161E/MAX3162E RS-232 Loopback Test Resultat 250kbps, FAST = Low
at 1Mbps, FAST = High
Multiprotocol Bus
Multiprotocol Bus Multiplexer
The Typical Operating Circuitshows a standard appli-The Typical Application Circuitshows the MAX3161Ecation for the MAX3160E. The MAX3160E’s outputs areconfigured as a multiprotocol bus multiplexer. Themultiplexed between RS-232 and RS-485 protocols byMAX3161E separates the RS-232 and RS-485 lines, buta microprocessor (µP). The µP also directs the shut-shares the logic pins between modes. This applicationdown functions, enable lines, and the duplex of theallows the µP to monitor a point-to-point RS-232 bus, andMAX3160E. Data is transmitted to the MAX3100 UARTa multidrop RS-485 interface. The MAX3100 UART asyn-through an SPI™ port. The UART asynchronouslychronously transfers data through the MAX3161E to thetransfers data through the MAX3160E to the pin-select-pin-selected RS-232 or RS-485 protocol.
ed RS-232 or RS-485 protocal. See Table 14 for com-monly used cable connections.
SPI is a registered trademark of Motorola, Inc.
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MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162E3.3VMAX3160EMAX3161EMAX3162EARORE485RB120ΩDATA IN227C2100nFC2+VCCC1+13CBYPASS100nFDE485ZDY120ΩDATA OUTRCV261351023C1100nFC2-MAX3162EC1-SHDNT1OUTR2OUTDIR2INR1INRE232TE232FASTV+GNDT1INDI24NOTE: RE485 ON MAX3162E ONLYTXRTS192015161428C3100nF11RO9R1OUT12RE48522DE485ABZYV-17186725C4100nFFigure 17. RS-485 Line Repeater
Figure 18. Protocol Translator20______________________________________________________________________________________
元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,RS-232 Transmitters Truth TablesRS-232 Receivers Truth TablesTable 1. MAX3160ETable 4. MAX3160EINPUTSOUTPUTSINPUTSOUTPUTSSHDNRS-485/DI/T1IN,Z(B)/T1OUT,RS-232RS-485/B/R1IN,R1OUT,DE485/T2INY(A)/T2OUTSHDNRS-232A/R2INRO/R2OUT0XX1/8-unit loadX0011001X0101010X0Inputs open111XRS-485 modeR1OUTX1XHigh-impedance,Table 2. MAX3161ERO/R2OUT inRS-485 modeINPUTSOUTPUTSSHDNRS-485/DI/T1IN,RS-232DE485/T2INT1OUT, T2OUTTable 5. MAX3161E0XXHigh-impedanceINPUTSOUTPUTS1001SHDNRS-485/RS-232R1IN, R2INR1OUT,RO/R2OUT101011XHigh-impedanceX001X010X0Inputs open1Table 3. MAX3162ER1OUT High-impedance,INPUTSOUTPUTSX1XSHDNTE232T1IN,T2INT1OUT, T2OUTRO/R2OUT inRS-485 mode0XXHigh-impedanceX0XHigh-impedance1101Table 6. MAX3162E1110INPUTSOUTPUTSSHDNRE232R1IN, R2INR1OUT, R2OUTX1XHigh-impedanceX001X010X0Inputs open1______________________________________________________________________________________21
MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162ERS-485/RS-422 Drivers Truth TablesTable 7. MAX3160EINPUTSSHDN0111XRS-485/RS-232X1110DE485/T2INX011XDI/T1INXX01XZ(B)/T1OUT1/8-unit load1/8-unit load10RS-232 modeOUTPUTSY(A)/T2OUT1/8-unit load1/8-unit load01Table 8. MAX3161EINPUTSSHDN0XX11RS-485/RS-232X0X11DE485/T2INXX011DI/T1INXXX01Z(B)1/8-unit load1/8-unit load1/8-unit load10OUTPUTSY(A)1/8-unit load1/8-unit load1/8-unit load01Table 9. MAX3162EINPUTSSHDN0X11DE485X011DIXX01ZHigh-impedanceHigh-impedance10OUTPUTSYHigh-impedanceHigh-impedance01RS-485/RS-422 Receivers Truth TablesTable 10. MAX3160EINPUTSRS-485/RS-23211111110SHDN0111111XHDPLXX000111X(A - B)*X≥-50mV≤-200mVFloatingXXXX(Y - Z)*XXXX≥-50mV≤-200mVFloatingXOUTPUTRO/R2OUTHigh-impedance up to VCC101101RS-232 mode*Y and Z correspond to pins Y(A)/T2OUT and Z(B)/T1OUT. A and B correspond to pins A/R2IN and B/R1IN.22
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元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,RS-485/RS-422 Receivers Truth Tables (continued)
Table 11. MAX3161EINPUTSOUTPUTRS-485/RS-232SHDNHDPLXA - BY(A) - Z(B)RO/R2OUT10XXXHigh-impedance up to VCC110≥-50mVX1110≤-200mVX0110FloatingX1111X≥-50mV1111X≤-200mV0111XFloating10XXXXRS-232 modeTable 12. MAX3162ETable 13. Required Minimum CapacitanceINPUTSOUTPUTValuesSHDNRE485A - BROSUPPLY0XXHigh-impedanceVOLTAGE (V)C1 (µF)C2, C3, C4,CBYPASS (µF)X1XHigh-impedance+3.0 to +3.60.10.110≥-50mV1+4.5 to +5.50.0470.3310≤-200mV0+3.0 to +5.50.10.4710Inputs1______________________________________________________________________________________23
MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162ETable 14. Cable Connections Commonly Used for EIA/TIA-232 and V.24 Asynchronous InterfacesEIA/TIA-232STANDARDDCDRDTDDTRSGDSRRTSCTSRICONNECTORPIN123456789MAX3160EMAX3161EMAX3162EEQUIVALENT—R2INT1OUT—GND—T2OUTR1IN—PIN NUMBERMAX3160E—135—4—614—MAX3161E—175—4—818—MAX3162E—195—4—820—Data carrier detectReceived dataTransmitted dataData terminal readySignal groundData set readyReq uest to send ( = D TE ready)Clear to send (= DCE ready)Ring indicatorFUNCTION(AS SEEN BY DTE)Typical Application Circuit
+3.3V2VCC14HDPLXRS-232517818RS-485Y(A)DB9TXMAX3100UARTRXRTSCTS131211102010199DI/T1INRO/R2OUTDE485/T2INR1OUTMAX3161ET1OUTR2INT2OUTR1IN1RJ45SPIGND4FAST127Z(B)RS-485/6RS-232SHDN1311µPRS-485/RS-232SHDNMULTIPROTOCOL BUS MULTIPLEXER24______________________________________________________________________________________元器件交易网www.cecb2b.comRS-232/RS-485/RS-422 Multiprotocol Transceivers
±15kV ESD-Protected, +3.0V to +5.5V, 10nA,Pin ConfigurationsTOP VIEWC1+120V+C1+124V+C1+128V+VCC219C2+VCC223C2+VCC227C2+C1-318C2-C1-322C2-C1-326C2-GND417V-GND421V-GND425V-Z(B)/T1OUT5MAX3160E16DI/T1INT1OUT5MAX3161E20DI/T1INT1OUT524T1INY(A)/T2OUT615DE485/T2INZ(B)619DE485/T2INZ6MAX3162E23DIR1OUT714B/R1INY(A)718R1INY722DE485RO/R2OUT813A/R2INT2OUT817R2INT2OUT821T2INSHDN912HDPLXR1OUT916BR1OUT920R1INFAST1011RS-485/RS-232RO/R2OUT1015AR2OUT1019R2INSHDN1114HDPLXSSOPRO1118BFAST1213RS-485/RS-232RE4851217ASSOPSHDN1316TE232FAST1415RE232SSOPSelector GuideChip Information
P ARTD R S-485TRANSISTOR COUNT: 1805UALF LOW-MODETHROUGHINPUTPROCESS: CMOS
PINOUTUNITLOADS MAX3160E No Yes 1/4 MAX3161E No No 1/8M AX3162EY esY es1 /8______________________________________________________________________________________25
MAX3160E/MAX3161E/MAX3162E元器件交易网www.cecb2b.com±15kV ESD-Protected, +3.0V to +5.5V, 10nA,
RS-232/RS-485/RS-422 Multiprotocol TransceiversMAX3160E/MAX3161E/MAX3162EPackage Information
21SSOP.EPSINCHESDIMAA1BCEHDEeHLMIN0.0680.0020.010MAX0.0780.0080.015MILLIMETERSMIN1.730.050.25MAX1.990.210.38DDDDDINCHESMIN0.2390.2390.2780.3170.397MAX0.2490.2490.2890.3280.407MILLIMETERSMIN6.076.077.078.0710.07MAX6.336.337.338.3310.33N14L16L20L24L28L0.200.090.0040.008SEE VARIATIONS0.2050.3010.0250∞0.2120.3110.0378∞5.207.650.630∞5.387.900.958∞0.0256 BSC0.65 BSCNACBeDA1LNOTES:1. D&E DO NOT INCLUDE MOLD FLASH.2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006\").3. CONTROLLING DIMENSION: MILLIMETERS.4. MEETS JEDEC MO150.5. LEADS TO BE COPLANAR WITHIN 0.10 MM.PROPRIETARY INFORMATIONTITLE:PACKAGE OUTLINE, SSOP, 5.3 MMAPPROVALDOCUMENT CONTROL NO.REV.21-0056C11Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
26____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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