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FEATURES

DESCRIPTION

APPLICATIONS

Typical Application Circuit

1.2V

3.3V

TPS3808G12

TPS3808G33

DSP

SENSE

V

DD

V

DD

SENSE

V

I/O

V

CORE

GPIO

GND

GND

GND

RESET

MR

C

T

C

T

RESET

DBV PACKAGE

SOT23

(TOP VIEW)

SENSE

RESET

GND

MR

1

2

3

6

5

4

RESET

GND

MR

6

5

4

V

DD

SENSE

C

T

1

2

3

DRV PACKAGE

2mm x 2mm QFN

(TOP VIEW)

Power

PAD

TPS3808

SBVS050E – MAY 2004 – REVISED OCTOBER 2005

Low Quiescent Current, Programmable-Delay

Supervisory Circuit

•

Power-On Reset Generator with Adjustable

Delay Time: 1.25ms to 10s

The

TPS3808xxx

family

of

microprocessor

supervisory circuits monitor system voltages from

•

Very Low Quiescent Current: 2.4

µA typ

0.4V to 5.0V, asserting an open drain RESET signal

•

High Threshold Accuracy: 0.5% typ

when the SENSE voltage drops below a preset

•

Fixed Threshold Voltages for Standard

threshold or when the manual reset (MR) pin drops to

Voltage Rails from 0.9V to 5V and Adjustable

a logic low. The RESET output remains low for the

Voltage Down to 0.4V Are Available

user adjustable delay time after the SENSE voltage

and manual reset (MR) return above their thresholds.

•

Manual Reset (MR) Input

•

Open-Drain RESET Output

The TPS3808 uses a precision reference to achieve

•

Temperature Range: –40

°C to +125°C

delay time can be set to 20ms by disconnecting the

•

Small SOT23 and 2mm

× 2mm QFN Packages

a resistor, or can be user-adjusted between 1.25ms

•

DSP or Microcontroller Applications

capacitor. The TPS3808 has a very low typical

quiescent current of 2.4

µA so it is well-suited to

•

Notebook/Desktop Computers

battery-powered applications. It is available in a small

•

PDAs/Hand-Held Products

SOT23 and an ultra-small 2mm

× 2mm QFN

•

Portable/Battery-Powered Products

PowerPAD™ package and is fully specified over a

•

FPGA/ASIC Applications

temperature range of –40

°C to +125°C (T

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PowerPAD is a trademark of Texas Instruments.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.