OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

ADM8324WCA29ARJZR7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Supervisory Circuits with Windowed
Watchdog and Manual Reset in 5-Lead SOT-23
Data Sheet
ADM8323/ADM8324
Rev. A Document Feedback
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2013–2016 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
Windowed watchdog, 8 timeout options
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)
Manual reset input
Open-drain or push-pull
RESET
outputs
Low power consumption
Specified over wide temperature range (−40°C to +125°C)
Qualified for automotive applications
5-lead SOT-23 package
APPLICATIONS
Automotive
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAMS
ADM8323
V
CC
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WINDOWED
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
11802-001
Figure 1.
ADM8324
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WINDOWED
WATCHDOG
DETECTOR
V
REF
11802-002
DEBOUNCE
Figure 2.
GENERAL DESCRIPTION
The ADM8323/ADM8324 are supervisory circuits that monitor
power supply voltage levels and code execution integrity in
microprocessor-based systems. An on-chip watchdog timer checks
for activity within a preset timeout window. A reset signal can also
be asserted by an external push-button switch through a manual
reset input. The
RESET
output is either push-pull (ADM8323)
or open-drain (ADM8324).
A watchdog failure results in a low output on the
RESET
pin. A
failure can be triggered either by a fast watchdog error (watchdog
pulses too close together) or by a slow watchdog error (no watchdog
pulse within the timeout period). This effectively gives a window
to observe the watchdog pulse. The watchdog timeout is measured
from the last falling edge of the watchdog input (WDI). There are
eight different watchdog windows available, as shown in Table 5.
Each device is available in a choice of 26 reset threshold options
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).
The ADM8323/ADM8324 are available in a 5-lead SOT-23
package and typically consume only 10 μA, making them suitable
for use in low power portable applications.
ADM8323/ADM8324 Data Sheet
Rev. A | Page 2 of 16
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 Configuration 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
Windowed 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
Model Options ................................................................................ 12
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
Automotive Products ................................................................. 14
REVISION HISTORY
3/16—Rev. 0 to Rev. A
Change to Model Options Section Title ...................................... 12
Changes to Table 7 .......................................................................... 13
10/13—Revision 0: Initial Version
Data Sheet ADM8323/ADM8324
Rev. A | Page 3 of 16
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
0.9 5.5 V
V
CC
that Guarantees Valid Output 0.9
Supply Current 10 20 µA V
CC
= 5.5 V, WDI = 0 V
10 18 µA V
CC
= 3.6 V, WDI = 0 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 4
Reset Timeout Option A 1 1.4 1.8 ms
Reset Timeout Option B 20 28 36 ms
Reset Timeout Option C 140 200 260 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 (ADM8323)
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
OPEN-DRAIN OUTPUT (ADM8324)
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
See Table 5
Watchdog Timeout Period (Fast), t
WD-FAST
Watchdog Timeout Option A
1
1.5
ms
Watchdog Timeout Option B 10 15 ms
Watchdog Timeout Option C 10 15 ms
Watchdog Timeout Option D 10 15 ms
Watchdog Timeout Option E 10 15 ms
Watchdog Timeout Option F 16 24 ms
Watchdog Timeout Option G 27 41 ms
Watchdog Timeout Option H 512 768 ms
Watchdog Timeout Period (Slow), t
WD-SLOW
Watchdog Timeout Option A 10 15 ms
Watchdog Timeout Option B 100 150 ms
Watchdog Timeout Option C 300 450 ms
Watchdog Timeout Option D
10
15
sec
Watchdog Timeout Option E 60 90 sec
Watchdog Timeout Option F 44 66 ms
Watchdog Timeout Option G 76 114 ms
Watchdog Timeout Option H 1.24 1.86 sec
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ADM8324WCA29ARJZR7

Mfr. #:
Buy ADM8324WCA29ARJZR7
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits WWD MRb ODb 200msTO 1.5ms/10msWD 2.93V
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet