TPS3610U18

The TPS3610U18/TPS3610T50 belong to TPS3610 family. The family 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.

The features of TPS3610U18/TPS3610T50 can be summarized as (1)supply current of 40 A (Max); (2)battery supply current of 100 nA (Max); (3)precision supply-voltage monitor,18 V, 5 V; other options on request; (4)watchdog timer with 800-ms time-out; (5)backup-battery voltage can exceed VDD; (6)power-on reset generator with fixed 100-ms reset delay time; (7)battery-ok output; (8)voltage monitor for power-fail or low-battery monitoring; (9)manual switchover to battery-backup mode; (10)chip-enable gating:3 ns (at VDD = 5 V) max propagation delay; (11)battery-freshness seal; (12)14-pin TSSOP package; (13)temperature range: -40°C to 85°C.

The absolute maximum ratings of TPS3610U18/TPS3610T50 are (1)Supply voltage, VDD (see Note 2): 7 V; (2)all other pins (see Note 2): 03 V to 7 V; (3)continuous output current at VOUT, IO(VOUT):  400 mA; (4)continuous output current (all other pins) IO:±10 mA; (5)continuous total power dissipation  see dissipation rating table; (6)operating free-air temperature range, TA: -40°C to 85°C; (7)storage temperature range, Tstg: 65°C to 150°C; (8)lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds:  260°C.(Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to VSS.).