
Supervisory Circuits with Watchdog
and Manual Reset in 5-Lead SOT-23
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
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 (Min)
4 watchdog timeout options:
6.3 ms, 102 ms, 1600 ms, and 25.6s (Typ)
Manual reset input
Reset output stages:
Push-pull active-low
Open-drain active-low
Push-pull active-high
Low power consumption (3 μA)
Guaranteed reset output valid to V
CC
= 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
Rev.PrC
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FUNCTIONAL BLOCK DIAGRAM
ADM6316
V
CC
V
CC
MR
GND
WDI
RESET
RESET
GENERATOR
WATCHDOG
DETECTOR
DEBOUNCE
V
REF
0
Figure 1.
GENERAL DESCRIPTION
The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/
ADM6321/ADM6322 are supervisory circuits which 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 means of 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
(min) and four watchdog timeout options of 6.3 ms, 102 ms,
1600 ms, and 25.6s (typ).
The ADM6316-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
Output Stage
Part No.
ADM6316
ADM6317
ADM6318
ADM6319
ADM6320
ADM6321
ADM6322
Watchdog
Yes
Yes
Yes
–
Yes
Yes
–
Manual Reset
Yes
Yes
–
Yes
Yes
-
Yes
RESET
Push-Pull
–
Push-Pull
Push-Pull
Open-Drain
Open-Drain
Open-Drain
RESET
–
Push-Pull
Push-Pull
Push-Pull
–
Push-Pull
Push-Pull
PRELIMINARY TECHNICAL DATA