TS803

Microprocessor Reset Circuit

1/6

Version: A07

SOT-23

General Description

The TS803/TS803R 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 140ms

after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply

voltages are available. The TS803/TS803R are open –drain outputs. The TS803/TS803R have an active low RESET

output, while the TS803/TS803R 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 TS803/TS803R ideal for use in portable equipment.

Features

●

Precision monitoring of +3V, +3.3V & +5V power

supply voltage

●

Fully specified over temperature

●

Available in three output configurations

●

Open-Drain RESET low output

●

3uA supply current

●

Guaranteed reset valid to Vcc = +1V

●

Power supply transient immunity

●

No external components

Applications

●

Computers

●

Controllers

●

Intelligent Instruments

●

Critical uP and uC power monitoring

●

Portable / Battery Power Equipment

●

Automotive

Ordering Information

Note: x is the threshold voltage type, option as

TS803 Threshold Voltage

A : 4.63V

B : 4.38V

C : 4.00V

D : 3.08V

E : 2.93V

F : 2.63V

G : 2.32V

H : 2.1V

I : 2.0V

J : 1.8V

K :1.6V

TS803R Threshold Voltage

B : 4.20V

E : 2.93V

F : 2.70V

Contact factory for additional voltage options.

Part No.

Package

Packing

TS803CXx RF

SOT-23

3Kpcs / 7” Reel

TS803RCXx RF

SOT-23

3Kpcs / 7” Reel

Absolute Maximum Rating

Parameter

Symbol

Value

Unit

Supply Voltage

7

V

RESET & (RESET) Open Drain

V

20

mA

Output Current, RESET

20

mA

100

V/uS

ESD Classification

B

Note: Stress above the listed absolute maximum rating may cause permanent damage to the device

HBM B: 2000V~3999V

Pin Definition:

TS803

TS803R

1. Ground

1. Reset

2. Reset

2. Ground

3. Vcc

3. Vcc