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ADM8321WCY46ARJZR7

P1-P3P4-P6P7-P9P10-P12P13-P15
Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
Data Sheet
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Rev. B Document Feedback
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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.
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Tel: 781.329.4700 ©2013–2016 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
27 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, 1.6 sec, and 25.6 sec (typical)
Manual reset input
Multiple reset output options
Low power consumption
Specified over wide temperature range (−40°C to +125°C)
Qualified for automotive applications
5-lead SOT-23 package
APPLICATIONS
Automotive infotainment
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAMS
Figure 1. ADM8316
Figure 2. ADM8320
GENERAL DESCRIPTION
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 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 switch through a manual reset input.
The six devices feature different combinations of watchdog
input, manual reset input, and output stage configuration,
as shown in Table 6.
Each device is available in a choice of 27 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,
1.6 sec, and 25.6 sec (typical).
The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/
ADM8322 are available in 5-lead SOT-23 packages and typically
consume only 10 µA, making them suitable for use in low
power, portable applications.
ADM8316
V
CC
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
11779-001
ADM8320
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
V
REF
11779-002
DEBOUNCE
ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322 Data Sheet
Rev. B | Page 2 of 15
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 10
Circuit Description..................................................................... 10
Push-Pull Reset Output ............................................................. 10
Open-Drain
RESET
Output ..................................................... 10
Manual Reset Input .................................................................... 10
Watchdog Input .......................................................................... 10
Applications Information .............................................................. 11
Watchdog Input Current ........................................................... 11
Negative Going V
CC
Transients ................................................. 11
Ensuring Reset Valid to V
CC
= 0 V ........................................... 11
Watchdog Software Considerations ......................................... 11
Options ............................................................................................ 12
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
Automotive Products ................................................................. 15
REVISION HISTORY
9/2016—Rev. A to Rev. B
Change to Features Section ............................................................. 1
Changes to Table 9 .......................................................................... 12
Changes to Table 10 ........................................................................ 13
Changes to Ordering Guide .......................................................... 14
9/2015—Rev. 0 to Rev. A
Changes to Table 1 0 ........................................................................ 13
10/13—Revision 0: Initial Version
Data Sheet ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322
Rev. B | Page 3 of 15
SPECIFICATIONS
V
CC
= (V
TH
+ 1.5%) to 5.5 V, T
A
= −40°C to +125°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
V
CC
Operating Voltage Range
1
5.5
V
V
CC
that Guarantees Valid Output 0.9 V
Supply Current (WDI Floating) 10 20 µA V
CC
= 5.5 V
10 18 µA V
CC
= 3.6 V
RESET THRESHOLD VOLTAGE
2
V
TH
− 1% V
TH
V
TH
+ 1% V T
A
= 25°C
V
TH
− 1.5% V
TH
V
TH
+ 1.5% V T
A
= −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT 20 ppm/°C
RESET THRESHOLD HYSTERESIS 2.5 × V
TH
mV
RESET TIMEOUT PERIOD See Table 7
Reset Timeout Option A 1 1.4 1.8 ms
Reset Timeout Option B 20 28 36 ms
Reset Timeout Option C
200
260
ms
Reset Timeout Option D 1120 1600 2080 ms
V
CC
TO RESET DELAY, t
RD
90 µs V
CC
falling at 1 mV/µs
PUSH-PULL OUTPUT (ADM8316, ADM8318, ADM8319,
ADM8321, ADM8322)
RESET Output Voltage
0.2
V
V
CC
≥ 0.9 V, I
SINK
= 25 µA
0.2 V V
CC
≥ 1.2 V, I
SINK
= 100 µA
0.2 V V
CC
≥ 2.7 V, I
SINK
= 1.2 mA
0.3 V V
CC
≥ 4.5 V, I
SINK
= 3.2 mA
0.9 × V
CC
V V
CC
≥ 2.7 V, I
SOURCE
= 500 µA
0.9 × V
CC
V V
CC
≥ 4.5 V, I
SOURCE
= 800 µA
RESET Rise Time
50
100
ns
From 10% to 90% V
CC
, C
L
= 5 pF,
V
CC
= 3.3 V
RESET Output Voltage 0.2 V V
CC
≥ 2.7 V, I
SINK
= 1.2 mA
0.3 V V
CC
≥ 4.5 V, I
SINK
= 3.2 mA
0.9 × V
CC
V V
CC
≥ 2.7 V, I
SOURCE
= 500 µA
0.9 × V
CC
V V
CC
≥ 4.5 V, I
SOURCE
= 800 µA
OPEN-DRAIN OUTPUT (ADM8320, ADM8321, ADM8322)
RESET Output Voltage
0.2 V V
CC
≥ 0.9 V, I
SINK
= 25 µA
0.2
V
V
CC
≥ 1.2 V, I
SINK
= 100 µA
0.2 V V
CC
≥ 2.7 V, I
SINK
= 1.2 mA
0.3 V V
CC
≥ 4.5 V, I
SINK
= 3.2 mA
Open-Drain Reset Output Leakage Current 1 µA
WATCHDOG INPUT (ADM8316, ADM8318, ADM8320,
ADM8321)
Watchdog Timeout Period, t
WD
See Table 8
Watchdog Timeout Option W 4.5 6.3 8.1 ms
Watchdog Timeout Option X 72 102 132 ms
Watchdog Timeout Option Y 1.12 1.6 2.24 sec
Watchdog Timeout Option Z 18.0 25.6 33.2 sec
WDI Pulse Width 50 ns V
IL
= 0.3 × V
CC
, V
IH
= 0.7 × V
CC
WDI Input Threshold 0.3 × V
CC
0.7 × V
CC
V
WDI Input Current 35 100 µA
P1-P3P4-P6P7-P9P10-P12P13-P15

ADM8321WCY46ARJZR7

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Supervisory Circuits WD ODb PP 200msTO 1.6sWD 4.63V
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