Supervisory Circuit with Watchdog, Manual Reset, and Active-Low/Open-Drain

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 of the data sheet.

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 in the data sheet 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.

APPLICATIONS

* Microprocessor systems

* Computers and controllers

* Intelligent instruments

* Portable equipment

* 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