TS809/810/809R/810R

1-6

2004/09 rev. D

TS809/ 810/ 809R/ 810R

Microprocessor Reset Circuit

Pin assignment:

TS809/810

1. Gnd

2. RESET (RESET)

3. Vcc

Pin assignment:

TS809R/810R

1.

RESET (RESET)

2.

Gnd

3.

Vcc

Threshold Voltage Option

From 2.63V ~ 4.63V

General Description

The TS809/810/809R/810R are microprocessor (µP) supervisory circuit used to monitor the power supplies in µP and

digital systems. They provide excellent circuit reliability and low cost by eliminating external components and

adjustments when used with +5V, +3.3V, +3.0V powered circuits. These circuits perform a single function: they assert

a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least

240ms(typ) after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of

supply voltages are available. The TS809/810/809R/810R have push pull outputs. The TS809/809R have an active

low RESET output, while the TS810/810R has an active high RESET output. The reset comparator is designed to

ignore fast transients on VCC, and the output guaranteed to be in the correct logic state for VCC down to 1V. Low

supply correct makes the TS809/810/809R/810R ideal for use in portable equipment.

The TS809/810/809R/810R is available in a 3-pin SOT-23 package.

Features

Precision monitoring of +3V, +3.3V and +5V

power supply voltage

Fully specified over temperature

Available in three output configurations

140mS min. power-on reset pulse width

12uA supply current

Guaranteed reset valid to Vcc = +1V

Power supply transient immunity

No external components

Ordering Information

Note: x is the threshold voltage type, option as

A: 4.63V

B: 4.38V

C: 4.00V

D: 3.08V

E: 2.93V

F: 2.63V

Part No.

Enable Function

Package

TS809CX x

Active-Low

TS810CX x

Active-High

TS809RCXx

Active-Low

TS810RCXx

Active-High

SOT-23

Applications

Computers

Controllers

Intelligent instruments

Critical uP and uC power monitoring

Portable / Battery powered equipment

Automotive

Pin Descriptions

Name

Description

Gnd

Ground

RESET

(RESET)

Reset output pin

L: for TS809 & TS811

H: for TS809R & TS811R

Vcc

Operating voltage input