©

1999 IMP, Inc.

408-432-9100/www.impweb.com

1

Key Features

Applications

4-Pin

visor

wit

eset

N Computers and controllers

N Embedded controllers

N Battery operated systems

N Intelligent instruments

N Wireless communication systems

N PDAs and handheld equipment

N Improved Maxim MAX811/MAX812 replacement

—

Specified to 105°C

—

New 4.0V threshold option

N 6µA supply current

N Monitor 5V, 3.3V and 3V supplies

N Manual reset input

N 140ms min. reset pulse width

N Guaranteed over temperature

N Active-LOW reset valid with 1.1V supply

(IMP811)

N Small 4-pin SOT-143 package

N No external components

N Power-supply transient-immune design

Block Diagrams

IMP811

(IMP812)

VCC

VCC

VCC

GND

GND

RESET

(RESET)

Manual

Reset

MR

811/12_01.eps

µC or µP

RESET

Input

The IMP811/IMP812 are low-power supervisors designed to monitor

voltage levels of 3.0V, 3.3V and 5.0V power supplies in low-power

microprocessor (µP), microcontroller (µC) and digital systems. Each fea-

tures a debounced manual reset input. The IMP811/812 are improved

drop-in replacements for the Maxim MAX811/812 with extended

temperature specifications to 105°C.

A reset signal is issued if the power supply voltage drops below a preset

threshold and is asserted for at least 140ms after the supply has risen

above the reset threshold. The IMP811 has an active-low output RESET

IMP812 has an active-high output RESET. The reset comparator is

Low power consumption makes the IMP811/IMP812 ideal for use in

portable and battery-operated equipment. Available in a compact 4-pin

SOT143 package, the devices use minimal board space.

Six voltage thresholds are available to support 3V to 5V systems:

IMP8

Reset Threshold

Suffix

Voltage (V)

L

4.63

M

4.38

J

4.00

T

3.08

S

2.93

R

2.63