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FEATURES

DESCRIPTION

APPLICATIONS

PFI

Backup

Battery

RESET

WDI

PFO

GND

External

Source

0.1

µF

Power

Supply

GND

RESET

I/O

I/O

Switchover

Capacitor

0.1

µF

TPS3617

TPS3618

Microcontroller

or

Microprocessor

ACTUAL SIZE

3,05 mm x 4,98 mm

RESET

WDI

PFO

GND

PFI

MSOP (DGK) Package

(TOP VIEW)

TPS3617

TPS3618

SLVS339D – DECEMBER 2000 – REVISED DECEMBER 2006

BATTERY-BACKUP SUPERVISOR FOR RAM RETENTION

• Supply Current of 40 µA (Max)

The TPS3617 and TPS3618 are battery-backup

supervisors that monitor 5 V supplies. They provide

• Battery Supply Current of 100 nA (Max)

a battery-backup function ideal for applications that

• Precision 5-V Supply Voltage Monitor, Other

require data retention of CMOS RAM during fault

Voltage Options on Request

• Backup-Battery Voltage Can Exceed V

DD

• Watchdog Timer With 800-ms Time-Out

• Power-On Reset Generator With Fixed 100-ms

Reset Delay Time

The RESET output remains low until the delay time

• Voltage Monitor for Power-Fail or Low-Battery

Monitoring

than 1.1 V.

• Battery Freshness Seal (TPS3617 Only)

• 8-Pin MSOP Package

The PFI and PFO pins are provided if additional

voltage monitoring is needed. If the voltage at PFI is

• Temperature Range: –40° to +85°C

less than 1.15 V, the push-pull PFO pin will assert

low. When the voltage at PFI exceeds the threshold

voltage, PFO will go high.

• Fax Machines

These devices also feature a watchdog timer pin

• Set-Top Boxes

(WDI) that monitors processor activity and asserts

• Advanced Voice Mail Systems

RESET if the the processor is inactive longer than

• Portable Battery Powered Equipment

the watchdog timeout period. If the watchdog timer is

• Computer Equipment

not used, the WDI pin should be left floating.

• Advanced Modems

The TPS3617 and TPS3618 are available in an 8-pin

• Automotive Systems

MSOP package and are characterized for operation

over a temperature range of –40

°C to +85°C.

• Portable Long-Time Monitoring Equipment

• Point-of-Sale Equipment

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2006, 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.