features

Supply Current of 40 μA (Max)

Battery Supply Current of 100 nA (Max)

Precision Supply-Voltage Monitor,

1.8 V, 5 V; Other Options on Request

Watchdog Timer With 800-ms Time-Out

Backup-Battery Voltage Can Exceed VDD

Power-On Reset Generator With Fixed

100-ms Reset Delay Time

Battery-OK Output

Voltage Monitor for Power-Fail or

Low-Battery Monitoring

Manual Switchover to Battery-Backup

Mode

Chip-Enable Gating . . . 3 ns (at VDD = 5 V)

Max Propagation Delay

Battery-Freshness Seal

14-pin TSSOP Package

Temperature Range . . . –40°C to 85°C

typical applications

Fax Machines

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

description

The TPS3610 family of supervisory circuits monitors and controls processor activity by providing backup-battery

switchover for data retention of CMOS RAM. Other features include an additional power-fail comparator,

low-line indication, watchdog function, battery-status indicator, manual switchover, and write protection for

CMOS RAM.

The TPS3610 family allow usage of 3-V or 3.6-V lithium batteries as the backup supply in systems with, e.g.,

VDD= 1.8 V. During power-on, RESET is asserted when the supply voltage (VDD or VBAT) becomes higher than

1.1 V. Thereafter, the supply-voltage supervisor monitors VDD and keeps RESET output active as long as VDD

remains below the threshold voltage VIT. An internal timer delays the return of the output to the inactive state

(high) to ensure proper system reset. The delay time starts after VDD has risen above the threshold voltage VIT.

When the supply voltage drops below the threshold voltage VIT, the output becomes active (low) again.

The product spectrum is designed for supply voltages of 1.8 V and 5 V. The circuits are available in a 14-pin

TSSOP package. TPS3610 devices are characterized for operation over a temperature range of –40°C to 85°C.