GENERAL DESCRIPTION

The ADM682x 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 means of an external push-button through a manual reset input. The parts feature different combinations of watchdog input and manual reset input and output stage configurations, as shown in Table 1.

FEATURES

Precision low voltage monitoring

9 reset threshold options: 1.58 V to 4.63 V

140 ms (min) reset timeout

Watchdog timer with 1.6 sec timeout

Manual reset input

Reset output stages

Push-pull active-low

Open-drain active-low

Push-pull active-high

Low power consumption (7 μA)

Guaranteed reset output valid to VCC = 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