SGM811/SGM812

Microprocessor Supervisory

with Manual Reset Input

GENERAL DESCRIPTION

The SGM811/SGM812 supervisory circuits monitor the

power supply voltage in microprocessor and digital

systems. The SGM811/SGM812 is designed to monitor

seven different voltages; these voltages have been

selected for the effective monitoring of 1.8V, 2.5V, 3V,

3.3V and 5V supply voltage levels.

They provide a reset output during power-up, power-

down and brownout conditions. On power-up, an internal

timer holds reset asserted for 240ms. This holds the

microprocessor in a reset state until conditions have

active high signal (RESET) output.

The SGM811/SGM812 has a manual reset input. The

manual reset function is very useful, especially if the

circuit in which the SGM811/SGM812 is 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. The devices come in

SOT-143 and SOT-23-5 packages.

APPLICATIONS

Microprocessor Systems

Controllers

Intelligent Instruments

Automotive Systems

Safety Systems

Portable Instruments

FEATURES

● Superior Upgrade for MAX811/MAX812 and

ADM811/ADM812

● Specified Over Temperature

● Low Power Consumption (13μA TYP)

● Precision Voltage Monitor: 1.8V, 2.5V, 3V, 3.3V

and 5V Options

● 150ms Min Power-On Reset

Logic High RESET Output (SGM812)

● Manual Reset Input

● Green SOT-143 and SOT-23-5 Packages

1

3

4

SOT-23-5

GND

RESET/RESET

5

MR

2

NC

1

2

3

4

SOT-143

GND

RESET/RESET

MR

TYPICAL OPERATION CIRCUIT

MICROPROCESSOR

SYSTEM

SGM811

GND

RESET

MR

RESET

GND

100kΩ

REV. B. 4

SG Micro Corp

www.sg-micro.com