1

FEATURES

DESCRIPTION

APPLICATIONS

RESET

GND

MR

6

5

4

V

DD

SENSE

C

T

1

2

3

DRVPACKAGE

2mmx2mmQFN

(TOPVIEW)

Power

PAD

DBVPACKAGE

SOT23

(TOPVIEW)

V

DD

SENSE

C

T

RESET

GND

MR

1

2

3

6

5

4

1.2V

3.3V

TPS3818G12

TPS3818G33

DSP

SENSE

V

DD

V

DD

SENSE

V

I/O

V

CORE

GPIO

GND

GND

GND

RESET

MR

C

T

C

T

RESET

TypicalApplicationCircuit

TPS3818

Low Quiescent Current, Accurate Programmable-Delay

Supervisory Circuit

23

• Power-On Reset Generator with Adjustable

The

TPS3818xxx

family

of

microprocessor

Delay Time: 1.25ms to 10s

supervisory circuits monitor system voltages from

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

• Very Low Quiescent Current: 2.4µA typ

when the SENSE voltage drops below a preset

• High Threshold Accuracy: 0.5% typ

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

• Fixed Threshold Voltages for Standard Voltage

a logic low. The RESET output remains low for the

Rails from 0.9V to 5V and Adjustable Voltage

user-adjustable delay time after the SENSE voltage

Down to 0.4V Are Available

and manual reset (MR) return above the respective

thresholds.

• Manual Reset (MR) Input

The TPS3818 uses a precision reference to achieve

• Open-Drain RESET Output

• 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

capacitor. When used with an external capacitor, the

• DSP or Microcontroller Applications

TPS3818xxx gives a more accurate delay time than

• Notebook/Desktop Computers

the similar TPS3808xxx device. The TPS3818 has a

• PDAs/Hand-Held Products

very low typical quiescent current of 2.4

µA so it is

• Portable/Battery-Powered Products

well-suited to battery-powered applications. It is

• FPGA/ASIC Applications

available in either a small SOT23 and an ultra-small

2mm × 2mm QFN PowerPAD™ package, and is fully

specified over a temperature range of –40°C to

1

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.

2

PowerPAD is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, 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.