Supervisory Circuits with Watchdog

and Manual Reset in 5-Lead SOT-23

Data Sheet

ADM6316/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322

Rev. J

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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

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

MR

GND

WDI

RESET

RESET

GENERATOR

WATCHDOG

DETECTOR

DEBOUNCE

Figure 1.

ADM6320

MR

GND

WDI

RESET

RESET

GENERATOR

WATCHDOG

DETECTOR

DEBOUNCE

Figure 2.

GENERAL DESCRIPTION

The ADM6316/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 devices feature different combinations of

watchdog input, manual reset input, and output stage

configuration, as shown in Table 1.

Each device 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). Not all device options are released

for sale as standard models. See the Ordering Guide for details.

The ADM6316/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

RESET

ADM6316

Yes

Yes

Push-pull

No

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