V

DD

Reset

GND

Microprocessor,

PMU

V

= 1.6 V to 6.5 V

IN

RST

GND

PB1

PB2

TS

VCC

1

2

3

6

5

4

TPS3420, TPS3421

DRY PACKAGE

1,45-mm x 1-mm SON

(TOP VIEW)

RST

GND

PB1

TST

TS

VCC

1

2

3

6

5

4

TPS3422

DRY PACKAGE

1,45-mm x 1-mm SON

(TOP VIEW)

VCC

PB1

RST

GND

TPS3421

PB2

TS

Push-

Button

Switch

Push-

Button

Switch

TPS3420

TPS3421

TPS3422

www.ti.com

SBVS211A – AUGUST 2012 – REVISED MARCH 2013

Low-Power, Push-Button Controllers with Configurable Delay

Check for Samples: TPS3420, TPS3421, TPS3422

1

FEATURES

DESCRIPTION

The TPS3420, TPS3421, and TPS3422 (TPS342x)

23

•

Very Small Package: 1.45-mm × 1-mm SON

are low-current, ultrasmall, push-button reset timers.

•

Operating Range: 1.6 V to 6.5 V

These devices use a long timing setup delay to

•

Single (TPS3422) or Dual (TPS3420 and

provide the intended system reset, and avoid resets

TPS3421) Push-Button Inputs

from short push-button closures or key presses. This

reset configuration also allows for differentiation

•

Low Supply Current: 250 nA

between software interrupts and hard system resets.

•

Two-State Logic, User-Selectable Input Delay:

The TPS3420 and TPS3421 monitor two inputs (PB1

–

For Example: 7.5 s and 0 s

and PB2) and output an active-low reset pulse signal

–

Multiple Timing Options Available

(RST) when both inputs are low for the selected time

•

Fixed Timeout Pulse at RST (TPS3421 and

delay. For the TPS3421, RST remains low for a

factory-programmed fixed time. For the TPS3420,

TPS3422): 400 ms

RST remains low until one of the PBx inputs is

–

Other Timing Options Available on Request

released. The need for a dedicated reset button is

•

Active Low, Open-Drain Output

eliminated because two inputs are used to ensure

reset. The TPS3422 monitors one input (PB1) and

APPLICATIONS

outputs an active-low reset pulse signal (RST) when

PB1 is low for the selected time delay.

•

Smart Phones

The TPS342x have an open-drain output that can be

•

Tablets, Ultrabooks™

wire ORed with other open-drain devices. The

•

Gaming Consoles

TPS342x operate from 1.6 V to 6.5 V over the –40°C

•

Portable Consumer

to +125°C temperature range, and provide a precise,

space-conscious micropower solution for system

•

Navigation Devices

resetting needs.

•

Consumer Medical

•

Toys

NOTE: Connect TS to VCC or ground for different PB time delays. Connect one PB input to ground for use as a single channel.

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

Ultrabooks is a trademark of Intel Corporation.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012–2013, 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.