1

FEATURES

DESCRIPTION

APPLICATIONS

RESET

MR

PFO

8

7

6

5

1

2

3

4

GND

PFI

DGK PACKAGE

(TOP VIEW)

ACTUAL SIZE

3,05 mm x 4,98 mm

TYPICAL OPERATING CIRCUIT

PFI

Backup

Battery

RESET

PFO

GND

External

Source

0.1

µF

Power

Supply

GND

RESET

I/O

Switchover

Capacitor

0.1

µF

TPS3619

TPS3620

Microcontroller

or

Microprocessor

Manual

Reset

MR

TPS3619-33,, TPS3619-50

TPS3620-33, TPS3620-50

SLVS387H – APRIL 2001 – REVISED DECEMBER 2007

www.ti.com

BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION

2

• Supply Current of 40 µA (Max)

• Battery-Supply Current of 100 nA (Max)

The TPS3619 and TPS3620 families of supervisory

circuits monitor and control processor activity by

• Precision Supply Voltage Monitor 3.3 V, 5 V,

providing backup-battery switchover for data retention

Other Options on Request

of CMOS RAM.

• Backup-Battery Voltage Can Exceed V

DD

During power on, RESET is asserted when the

• Power On Reset Generator With Fixed 100-ms

Reset Delay Time

V. Thereafter, the supply voltage supervisor monitors

• Voltage Monitor For Power-Fail or Low-Battery

Monitoring

timer delays the return of the output to the inactive

• Battery Freshness Seal (TPS3619)

state (high) to ensure proper system reset. The delay

• Pin-For-Pin Compatible With MAX819,

MAX703, and MAX704

• 8-Pin MSOP Package

active (low) again.

• Temperature Range –40°C to +85°C

The product spectrum is designed for supply voltages

of 3.3 V and 5 V. The TPS3619 and TPS3620 are

available in an 8-pin MSOP package and are

characterized for operation over a temperature range

• Fax Machines

of –40

°C to +85°C.

• Set-Top Boxes

• Advanced Voice Mail Systems

• Portable Battery-Powered Equipment

• Computer Equipment

• Advanced Modems

• Automotive Systems

• Portable Long-Time Monitoring Equipment

• Point-of-Sale Equipment

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

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2007, 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.