Microprocessors Supervisory Circuit in 4-Lead SOT-143, Logic High RESET Output

The ADM811/ADM812 are reliable voltage monitoring devices suitable for use in most voltage monitoring applications. The ADM811/ADM812 are designed to monitor six different voltages, each allowing a 5% or 10% degradation of standard PSU voltages before a reset occurs. These voltages have been selected for the effective monitoring of 2.5 V, 3 V, 3.3 V, and 5 V supply voltage levels.

Included in this circuit is a debounced manual reset input. Reset can be activated using an electrical switch (or an input from another digital device) or by a degradation of the supply voltage. The manual reset function is very useful, especially if the circuit in which the ADM811/ADM812 are operating enters into a state that can only be detected by the user. Allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system.

Applications

* Microprocessor systems

* Controllers

* Intelligent instruments

* Automotive systems

* Safety systems

* Portable instruments

* Superior upgrade for MAX811/MAX812

* Specified over temperature

* Low power consumption: 5 μA typical

* Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options

* Reset assertion down to 1 VCC

* Power-on reset: 140 ms minimum

* Logic high RESET output

* Built-in manual reset