features
Supply Current of 40 μA (Max)
Precision Supply Voltage Monitor
− 2.0 V, 2.5 V, 3.3 V, 5.0 V
− Other Versions 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
Manual Reset
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 TPS3600 family of supervisory circuits monitor and control processor activity. In case of power-fail or
brownout conditions, the backup-battery switchover function of TPS3600 allows to run a low-power processor
and its peripherals from the installed backup battery without asserting a reset beforehand.
During power on, RESET is asserted when the supply voltage (VDD or VBAT) becomes higher than Vres.
Thereafter, the supply voltage supervisor monitors VOUT and keeps RESET output active as long as VOUT
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. This delay timer starts its time-out, after VOUT has risen above the
threshold voltage (VIT). In case of a brownout or power failure of both supply sources, a voltage drop below the
threshold voltage (VIT) get detected and the output becomes active (low) again.
The product spectrum is designed for supply voltages of 2 V, 2.5 V, 3.3 V, and 5 V. The circuits are available
in a 14-pin TSSOP package. They are characterized for operation over a temperature range of −40°C to 85°C.