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Low Voltage Supervisory Circuit with
Watchdog and Manual Reset in 5-Lead SOT-23
Data Sheet
ADM6823
Rev. D Document Feedback
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FEATURES
Precision low voltage monitoring
9 reset threshold options: 1.58 V to 4.63 V
140 ms (minimum) reset timeout
Watchdog timer with 1.6 sec timeout
Manual reset input
Reset output stage
Push-pull active-low
Low power consumption: 7 µA
Guaranteed reset output valid to V
CC
= 1 V
Power supply glitch immunity
Specified from −40°C to +125°C
5-lead SOT-23 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
ADM6823
V
CC
V
CC
MR
GND WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
04535-001
Figure 1.
GENERAL DESCRIPTION
The ADM6823 is supervisory circuit that monitors 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 means of an
external push-button through a manual reset input.
The part is available in nine reset threshold options, ranging
from 1.58 V to 4.63 V. The reset and watchdog timeout periods
are fixed at 140 ms (minimum) and 1.6 sec (typical),
respectively.
The ADM6823 is available in a 5-lead SOT-23 package and
typically consumes only 7 µA, making it suitable for use in low
power, portable applications.
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