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SS811, SS812

Rev.1.01 4/06/2004

Reset Circuits with Manual Reset Input

FEATURES

Ultra-low supply current of 1

µA (typ.)

Guaranteed reset valid to Vcc=0.9V

Available in two output yypes:

Push-pull active-low (SS811)

Push-pull active-high (SS812)

Power-on reset pulse width minimum 140ms

Internally fixed threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V,

4.4V, and 4.6V

Tight voltage threshold tolerance: 1.5%

Low profile package: SOT-23-5

APPLICATIONS

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Notebook Computers

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Digital Still Cameras

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PDAs

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Critical Microprocessor Monitoring

DESCRIPTION

The SS811 and SS812 are low-power microprocessor

(µP) supervisory circuits used to monitor power supplies

in µP and digital systems. They improve circuit reliability

and reduce cost by eliminating external components.

The SS811 and SS812 also offer a manual reset input.

These devices perform as valid singles in applications

with Vcc ranging from 6.0V down to 0.9V. The reset

signal lasts for a minimum period of 140ms whenever the

the SS811 and SS812 were designed with a reset

comparator to help identify invalid signals lasting less

than 140ms. The only difference between the SS811 and

the SS812 is that one has an active-low

RESET output

and the other has an active-high RESET output.

A low supply current (1

µA) makes the SS811 and

SS812 ideal for portable equipment. The devices are

available in a SOT-23-5 package.

TYPICAL APPLICATION CIRCUIT

VCC

VCC

GND

GND

µP

RESET

INPUT

RESET

(RESET)

MR

SS811

(SS812)

Pushbutton

Switch