TPS3617

TPS3617 TPS3618 www.ti.com SLVS339D – DECEMBER 2000 – REVISED DECEMBER 2006 BATTERY-BACKUP SUPERVISOR FOR RAM RETENTION FEATURES Supply Current of 40 µA (Max) Battery Supply Current of 100 nA (Max) Precision 5-V Supply Voltage Monitor, Other Voltage Options on Request Backup-Battery Voltage Can Exceed VDD Watchdog Timer With 800-ms Time-Out Power-On Reset Generator With Fixed 100-ms Reset Delay Time Voltage Monitor for Power-Fail or Low-Battery Monitoring Battery Freshness Seal (TPS3617 Only) 8-Pin MSOP Package Temperature Range: –40° to +85°C 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 MSOP (DGK) Package (TOP VIEW) VOUT VDD GND PFI VBAT RESET WDI PFO Power Supply 0.1 µF External Source ACTUAL SIZE 3,05 mm x 4,98 mm DESCRIPTION The TPS3617 and TPS3618 are battery-backup supervisors that monitor 5 V supplies. They provide a battery-backup function ideal for applications that require data retention of CMOS RAM during fault conditions. When the voltage at VDD drops below a preset threshold (VIT), the active low push-pull RESET output asserts, and VOUT switches from VDD to VBAT. When VDD rises above the trip threshold, VOUT switches immediately from VBAT to VDD. The RESET output remains low until the delay time (td) expires. During power on, RESET is asserted...