FEATURES
Precision power supply monitoring 31 reset threshold options 1.58 V to 5.0 V Four reset timeouts
1 ms, 20 ms, 140 ms, 1120 ms Manual reset input Reset output stage Push-pull active-low
Guaranteed reset output valid to VCC = 1 V Power supply glitch immunity
Specified over −40°C to +125°C temperature range 4-lead SC70 package
APPLICATIONS
Microprocessor systems Computers Controllers
Intelligent instruments Portable equipment
GENERAL DESCRIPTION
The ADM6384 is a supervisory circuit that monitors power supply voltage levels in microprocessor-based systems. A power-on reset signal is generated when the supply voltage rises to a preset threshold level. The debounced manual reset input of the ADM6384 can be used to initiate a reset by means of an external push-button or logic signal.
The part is available in a choice of 31 reset threshold options, from 1.58 V to 5.0 V. The minimum reset timeout periods are 1 ms, 20 ms, 140 ms, and 1120 ms.
The ADM6384 is available in a 4-lead SC70 package and typi-cally consumes only 7 μA, making it suitable for use in low power, portable applications.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
Microprocessor Supervisory Circuit in 4-Lead SC70ADM6384FUNCTIONAL BLOCK DIAGRAMS
ADM6384VCCRESETRESETVREFGENERATORMRDEBOUNCEGND100-50350 Figure 1.
VCCVCCADM6384μPMRRESETRESET100kΩGNDGND200-50350
Figure 2.
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ADM6384
TABLE OF CONTENTS Specifications.....................................................................................3 Absolute Maximum Ratings............................................................5 ESD Caution..................................................................................5 Pin Configuration and Function Descriptions.............................6 Typical Performance Characteristics.............................................7 Circuit Description...........................................................................9 Reset Output.................................................................................9
Manual Reset Input.......................................................................9 Application Information................................................................10 Negative-Going VCC Transients................................................10 Ensuring Reset Valid to VCC = 0 V...........................................10 Outline Dimensions.......................................................................11 Ordering Guide..........................................................................11
REVISION HISTORY
7/05—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
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ADM6384SPECIFICATIONS
VCC = full operating range; TA = −40°C to +125°C, unless otherwise noted. Table 1.
Parameter in Typ ax Unit Test Conditions/Comments SUPPLY VCC Operating Voltage Range 1 5.5 V Supply Current 7 13 μA VCC = 5.5 V, no load 6 11 μA VCC = 3.6 V, no load 4 7 μA VCC = 2.5 V, no load1 3 6 μA VCC = 1.8 V, no load1RESET THRESHOLD VOLTAGE ADM6384x50x 4.88 5.00 5.12 V ADM6384x49x 4.78 4.90 5.02 V
ADM6384x48x4.68 4.80 4.92 V ADM6384x47x 4.58 4.70 4.82 V
ADM6384x46x4.51 4.63 4.74 V ADM6384x45x 4.39 4.5 4.61 V
ADM6384x44x4.27 4.38 4.48 V ADM6384x43x 4.19 4.30 4.41 V ADM6384x42x 4.1 4.2 4.31 V ADM6384x41x 4.0 4.1 4.2 V ADM6384x40x 3.9 4.0 4.1 V ADM6384x39x 3.8 3.9 4.0 V
MMADM6384x38x 3.71 3.8 3.9 V
ADM6384x37x 3.61 3.7 3.79 V ADM6384x36x 3.51 3.6 3.69 V ADM6384x35x 3.41 3.5 3.59 V ADM6384x34x 3.32 3.4 3.49 V ADM6384x33x 3.22 3.3 3.38 V ADM6384x32x 3.12 3.2 3.28 V ADM6384x31x 3.00 3.08 3.15 V ADM6384x30x 2.93 3.0 3.08 V ADM6384x29x 2.85 2.93 3.00 V ADM6384x28x 2.73 2.8 2.87 V ADM6384x27x 2.63 2.70 2.77 V ADM6384x26x 2.56 2.63 2.69 V ADM6384x25x 2.44 2.5 2.56 V ADM6384x24x 2.34 2.4 2.46 V
ADM6384x23x2.26 2.31 2.37 V ADM6384x22x 2.13 2.19 2.24 V
ADM6384x17x1.62 1.67 1.71 V
ADM6384x16x1.54 1.58 1.61 V RESET THRESHOLD TEMPERATURE COEFFICIENT 60 ppm/°C
VCC to RESET DELAY 35 μs VCC falling at 10 mV/μs from VTH +
100 mV to VTH − 100 mV
RESET THRESHOLD HYSTERESIS 2 x VTH mV RESET TIMEOUT PERIOD ADM6384xxD1 1 2 ms ADM6384xxD2 20 40 ms ADM6384xxD3 140 280 ms ADM6384xxD4 1120 2240 ms
Rev. 0 | Page 3 of 12
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ADM6384 Parameter in Typ ax Unit Test Conditions/Comments MANUAL RESET INPUT MR Input Threshold VIL 0.3 × VCCV VCC < 4 V 0.8 V VCC > 4 V VIH0.7 × VCC V VCC < 4 V 2.4 V VCC > 4 V 1 μs MR Input Pulse Width 100 ns MR Glitch Rejection 32 63 100 kV MR Pull-Up Resistance 200 ns MR to Reset Delay RESET Output Voltage VOL VOH 0.3 V VCC > = 1.0 V, ISINK = 80 μA 0.3 V VCC > = 2.5 V, ISINK = 1.2 mA 0.4 V VCC > = 4.5 V, ISINK = 3.2 mA 0.8 × VCC V VCC > = 2.5 V, ISOURCE = 500 μA 0.8 × VCC V VCC > = 4.5 V, I SOURCE = 800 μA 1
TA = 25oC only.
MM
Rev. 0 | Page 4 of 12
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ADM6384
Rating −0.3 V to +6 V −0.3 V to +6 V 20 mA −40°C to +125°C −65°C to +150°C 331°C/W 240°C, 30 sec 260°C, 40 sec ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted. Table 2. Parameter VCCRESETOutput Current ( RESET) Operating Temperature Range Storage Temperature Range θJA Thermal Impedance, SC70 Soldering Temperature Sn/Pb Pb-Free Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degrada-tion or loss of functionality.
Rev. 0 | Page 5 of 12
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ADM6384
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND14ADM6384TOP VIEW(Not to Scale)VCCRESET23MR05305-003
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions Pin No. Name 1 GND 2 RESET 3 MR Description Ground. Active-Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. Push-pull output stage. Manual Reset Input. This is an active-low input which, when forced low for at least 1 μs, generates a reset. It features a 52 kV internal pull-up. Power Supply Voltage Being Monitored. 4 VCC
Rev. 0 | Page 6 of 12
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ADM6384TYPICAL PERFORMANCE CHARACTERISTICS
10.09.59.08.58.07.5)A7.0μ(C6.5CI6.05.55.04.54.03.5–40–20020406080100120TEMPERATURE (°C)Figure 4. Supply Current vs. Temperature
1009080)μs(70 AYL60DE T50ESRE40 OT C30CV20100–40–20020406080100120TEMPERATURE (°C)Figure 5. VCC to RESET Output Delay vs. Temperature
1.201.15TUO1.10MEIT1.05 TES1.00RE DEZ0.95ILAMR0.90NO0.850.80–40–20020406080100120TEMPERATURE (°C)Figure 6. Normalized Reset Timeout Period vs. Temperature
1.051.04DL1.03HOS1.02REHT1.01 TES1.00RE D0.99EZILA0.98MR0.97NO0.9660.950010-53–40–200204060801001200-53540
TEMPERATURE (°C)540
Figure 7. Normalized Reset Threshold vs. Temperature
0.200.15)(V T0.10UOV0.058700100--55301234567355440 ISINK (mA)0
Figure 8. Output Voltage Low vs. ISINK
2.922.902.88)(V TUOV2.862.8470802.821-05-300.20.40.60.81.0553450
ISOURCE (mA)40
Figure 9. Output Voltage High vs. ISOURCE
Rev. 0 | Page 7 of 12
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ADM6384
16014012010080604020010RESET OCCURS ABOVE CURVE340320300280260240220200180160140120–200204060TEMPERATURE (°C)8010012005305-011MAXIMUM TRANSIENT DURATION (μs)VTH = 4.63VVTH = 2.93V100OVERDRIVE VOD (mV)100005305-010MANUAL RESET TO RESET DELAY (ns)100–40
Figure 11. Manual Reset Minimum Pulse Width vs. Temperature
Figure 10. Maximum VCC Transient Duration vs. Reset Threshold Overdrive
Rev. 0 | Page 8 of 12
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ADM6384CIRCUIT DESCRIPTION
The ADM6384 provides microprocessor supply voltage supervision by controlling the microprocessor’s reset input. Code execution errors are avoided during power-up, power-down, and brownout conditions by asserting a reset signal
when the supply voltage is below a preset threshold. In addition, the ADM6384 allows supply voltage stabilization with a fixed timeout before the reset deasserts after the supply voltage rises above the threshold. If the user detects a problem with the system’s operation, a manual reset input is available to reset the microprocessor by means of an external push-button, for example.
VCCVCC1V0VVTHVTHVCCRESET0VtRPtRD05305-012
Figure 12. Reset Timing Diagram
MANUAL RESET INPUT
The ADM6384 features a manual reset input (MR) which, when driven low, asserts the reset output. When MR transitions from low to high, reset remains asserted for the duration of the reset active timeout period before deasserting. The MR input has a 52 kΩ internal pull-up so that the input is always high when unconnected. An external push-button switch can be connected between MR and ground so that the user can generate a reset. Debounce circuitry for this purpose is integrated on-chip. Noise immunity is provided on the MR input, and fast, negative-going transients of up to 100 ns (typ) are ignored. A 0.1 μF capacitor between MR and ground provides additional noise immunity.
RESET OUTPUT
The ADM6384 features an active-low push-pull reset output. The reset signal is guaranteed to be logic low for VCC down to 1 V.
The reset output is asserted when VCC is below the reset threshold (VTH) or when MR is driven low. Reset remains asserted for the duration of the reset active timeout period (tRP) after VCC rises above the reset threshold or after MR
transitions from low to high. Figure 12 illustrates the behavior of the reset outputs.
Rev. 0 | Page 9 of 12
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ADM6384
APPLICATION INFORMATION
NEGATIVE-GOING VCC TRANSIENTS
To avoid unnecessary resets caused by fast power supply transients, the ADM6384 is equipped with glitch rejection circuitry. The typical performance characteristic in Figure 10 plots VCC transient duration versus the transient magnitude. The curves show combinations of transient magnitude and duration for which a reset is not generated for 4.63 V and 2.93 V reset threshold parts. For example, with the 2.93 V threshold, a transient that goes 100 mV below the threshold and lasts 8 μs typically does not cause a reset, but if the transient is any bigger in magnitude or duration, a reset is generated. An optional 0.1 μF bypass capacitor mounted close to VCC provides additional glitch rejection.
ENSURING RESET VALID TO VCC = 0 V
Both active-low and active-high reset outputs are guaranteed to be valid for VCC as low as 1 V. However, by using an external resistor with push-pull configured reset outputs, valid outputs for VCC as low as 0 V are possible. For an active-low reset
output, a resistor connected between RESET and ground pulls the output low when it is unable to sink current. A large resistance such as 100 kΩ should be used so that it does not overload the reset output when VCC is above 1 V.
VCCADM6384RESET100kΩ05305-013GND
Figure 13. Ensuring Reset Valid to VCC = 0 V
Rev. 0 | Page 10 of 12
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ADM6384KKK
OUTLINE DIMENSIONS
1.351.152.201.80432.401.8012PIN10.65 BSC1.000.800.50 BSC0.400.1012°8°1.100.800.10 MAX0.300.15SEATING*0.70PLANE0.500.10 COPLANARITY0.180.100.300.10*PACKAGE OUTLINE CORRESPONDS IN FULL TO EIAJ SC82EXCEPT FOR WIDTH OF PIN-2 AS SHOWN
Figure 14. 4-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-4)
Dimensions shown in millimeters
ADM6384YKS_x_x D_-xRL7GENERIC NUMBERTEMPERATURE RANGEY:–40°C TO +125°CPACKAGE CODEKS: 4-LEAD SC70Z: LEAD FREEORDERING QUANTITYRL7: 3,000 PIECE REELRESET TIMEOUT PERIOD1: 1ms (MIN)2: 20ms (MIN)3: 140s (MIN)4: 1120s (MIN)RESET THRESHOLD NUMBER(16 TO 50)05305-014
Figure 15. Ordering Code Structure
ORDERING GUIDE
Standard Models1Reset Threshold (V) ADM6384YS29D1-RL7 2.93 ADM6384YS23D3-RL7 2.31 ADM6384YS29D3-RL7 2.93 Reset Timeout (ms) 1 140 140 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C Quantity Package Type Branding 3k SC70-4 N0J 3k SC70-4 N0J 3k SC70-4 N0J
1
If ordering nonstandard models, complete the ordering code shown in Figure 15 by inserting reset timeout and reset threshold suffixes. Contact Sales for availability of nonstandard models.
Rev. 0 | Page 11 of 12
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ADM6384
NOTES
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05305–0–7/05(0)
Rev. 0 | Page 12 of 12
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