Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsPMIC - system monitor Reset/power-on reset SOT 23 5

Supervisory Circuits with Watchdog

and Manual Reset in 5-Lead SOT-23

Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322

Rev. F Document Feedback

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FEATURES

26 reset threshold options

2.5 V to 5 V in 100 mV increments

4 reset timeout options

1 ms, 20 ms, 140 ms, and 1120 ms (minimum)

4 watchdog timeout options

6.3 ms, 102 ms, 1600 ms, and 25.6 sec (typical)

Manual reset input

Reset output stages

Push-pull active low

Open-drain active low

Push-pull active high

Low power consumption: 5 µA

Guaranteed reset output valid to V

= 1 V

Power supply glitch immunity

Specified over industrial temperature range

5-lead SOT-23 package

APPLICATIONS

Microprocessor systems

Computers

Controllers

Intelligent instruments

Portable equipment

FUNCTIONAL BLOCK DIAGRAMS

ADM6316

GND

WDI

RESET

GENERATOR

WATCHDOG

DETECTOR

DEBOUNCE

REF

04533-001

Figure 1.

ADM6320

GND WDI

RESET

GENERATOR

WATCHD

DETECTOR

DEBOUNCE

REF

04533-028

Figure 2.

GENERAL DESCRIPTION

The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/

ADM6321/ADM6322 are supervisory circuits that monitor

power supply voltage levels and code execution integrity in

microprocessor-based systems. As well as providing power-

on reset signals, an on-chip watchdog timer can reset the

microprocessor if it fails to strobe within a preset timeout

period. A reset signal can also be asserted by an external push

button through a manual reset input. The seven parts feature

different combinations of watchdog input, manual reset input,

and output stage configuration, as shown in Table 1.

Each part is available in a choice of 26 reset threshold options

ranging from 2.5 V to 5 V in 100 mV increments. There are also

four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms

(minimum) and four watchdog timeout options of 6.3 ms, 102 ms,

1600 ms, and 25.6 sec (typical).

The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/

ADM6321/ADM6322 are available in 5-lead SOT-23 packages

and typically consume only 3 µA, making them suitable for use

in low power portable applications.

Table 1. Selection Table

Part No. Watchdog Manual Reset

Output Stage

RESET

ADM6316 Yes Yes Push-pull No

ADM6317 Yes Yes No Push-pull

ADM6318 Yes No Push-pull Push-pull

ADM6319 No Yes Push-pull Push-pull

ADM6320 Yes Yes Open-drain No

ADM6321 Yes No Open-drain Push-pull

ADM6322 No Yes Open-drain Push-pull

Summary of content (16 pages)

PAGE 1
Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SOT-23 ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 FEATURES FUNCTIONAL BLOCK DIAGRAMS 26 reset threshold options 2.5 V to 5 V in 100 mV increments 4 reset timeout options 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) 4 watchdog timeout options 6.3 ms, 102 ms, 1600 ms, and 25.
PAGE 2
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Open-Drain RESET Output ........................................................9 Applications ....................................................................................... 1 Manual Reset Input .......................................................................9 Functional Block Diagrams ............
PAGE 3
Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 SPECIFICATIONS VCC = full operating range, TA = TMIN to TMAX, unless otherwise noted. Table 2. Parameter SUPPLY VCC Operating Voltage Range Supply Current Min RESET THRESHOLD VOLTAGE VTH − 1.5% VTH − 2.
PAGE 4
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 Parameter MANUAL RESET INPUT (ADM6316, ADM6317, ADM6319, ADM6320, ADM6322) MR Input Threshold MR Input Pulse Width MR Glitch Rejection MR Pull-Up Resistance MR to Reset Delay Min Typ 0.8 0.3 × VCC 1 35 100 52 230 Data Sheet Max Unit Test Conditions/Comments 2.0 0.7 × VCC V V µs ns kΩ ns VTH > 4.0 V VTH < 4.0 V 75 Rev.
PAGE 5
Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 3. Parameter VCC RESET (ADM6320, ADM6321, ADM6322) All Other Pins Output Current (RESET, RESET) Operating Temperature Range Storage Temperature Range θJA Thermal Impedance, SOT-23 Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating −0.3 V to +6 V −0.3 V to +6 V −0.3 V to (VCC + 0.
PAGE 6
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 4 WDI RESET 1 5 RESET 1 VCC TOP VIEW (Not to Scale) GND 2 4 WDI 04533-003 MR 3 4 WDI Figure 5. ADM6318/ADM6321 Pin Configuration ADM6317 GND 2 VCC TOP VIEW (Not to Scale) RESET 3 Figure 3. ADM6316/ADM6320 Pin Configuration 5 ADM6318/ ADM6321 04533-004 GND 2 TOP VIEW (Not to Scale) MR 3 RESET 1 VCC RESET 3 Figure 4.
PAGE 7
Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 TYPICAL PERFORMANCE CHARACTERISTICS 10.0 100 9.5 90 9.0 80 VCC = 5V 7.0 6.5 6.0 VCC = 3V 5.5 5.0 4.5 VCC = 1.5V –20 0 80 60 40 20 TEMPERATURE (°C) 40 30 20 –20 0 20 40 TEMPERATURE (°C) 60 80 Figure 10. VCC Falling to Reset Propagation Delay vs. Temperature 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 VCC (V) 3.5 4.0 4.5 5.0 5.
PAGE 8
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 1.20 Data Sheet 190 MR MINIMUM PULSE WIDTH (ns) 1.10 1.05 1.00 0.95 160 150 140 130 120 –20 0 20 40 TEMPERATURE (°C) 80 60 100 –50 Figure 13. Normalized Watchdog Timeout Period vs. Temperature (ADM6316/ADM6317/ADM6318/ADM6320/ADM6321) 160 50 Figure 15. Manual Reset Minimum Pulse Width vs. Temperature (ADM6316/ADM6317/ADM6319/ADM6320/ADM6322) 3.8 RESET OCCURS ABOVE CURVE 3.6 140 MINIMUM PULSE WIDTH (ns) 120 100 VTH = 4.
PAGE 9
Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 CIRCUIT DESCRIPTION RESET OUTPUT The ADM6316 features an active-low push-pull reset output, while the ADM6317/ADM6321/ADM6322 have active-high push-pull reset outputs. The ADM6318/ADM6319 feature dual active-low and active-high push-pull reset outputs. For activelow and active-high outputs, the reset signal is guaranteed to be logic low and logic high, respectively, for VCC down to 1 V.
PAGE 10
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 Data Sheet APPLICATIONS INFORMATION WATCHDOG INPUT CURRENT WATCHDOG SOFTWARE CONSIDERATIONS To minimize watchdog input current (and minimize overall power consumption), leave WDI low for the majority of the watchdog timeout period. When driven high, WDI can draw as much as 160 µA. Pulsing WDI low-to-high-to-low at a low duty cycle reduces the effect of the large input current.
PAGE 11
Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 OPTIONS Table 5. Reset Voltage Threshold Options Part No. ADM63xxx50 ADM63xxx49 ADM63xxx48 ADM63xxx47 ADM63xxx46 ADM63xxx45 ADM63xxx44 ADM63xxx43 ADM63xxx42 ADM63xxx41 ADM63xxx40 ADM63xxx39 ADM63xxx38 ADM63xxx37 ADM63xxx36 ADM63xxx35 ADM63xxx34 ADM63xxx33 ADM63xxx32 ADM63xxx31 ADM63xxx30 ADM63xxx29 ADM63xxx28 ADM63xxx27 ADM63xxx26 ADM63xxx25 Min 4.925 4.827 4.728 4.630 4.561 4.433 4.314 4.236 4.137 4.039 3.940 3.842 3.743 3.645 3.546 3.
PAGE 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 Data Sheet Table 8.
PAGE 13
Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 OUTLINE DIMENSIONS 3.00 2.90 2.80 1.70 1.60 1.50 5 1 4 2 3.00 2.80 2.60 3 0.95 BSC 1.90 BSC 1.45 MAX 0.95 MIN 0.15 MAX 0.05 MIN 0.50 MAX 0.35 MIN 0.20 MAX 0.08 MIN SEATING PLANE 10° 5° 0° 0.60 BSC 0.55 0.45 0.35 11-01-2010-A 1.30 1.15 0.90 COMPLIANT TO JEDEC STANDARDS MO-178-AA Figure 22.
PAGE 14
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 NOTES Rev.
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Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 NOTES Rev.
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ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 NOTES ©2004–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04533-0-5/13(F) Rev.