TPS3618-50DGKT

The TPS3618-50DGKT is a Battery-backup Supervisor that monitor 5V 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 expires. During power on, RESET is asserted when the supply voltage (VDD or VBAT) goes higher than 1.1 V. The PFI and PFO pins are provided if additional voltage monitoring is needed. If the voltage at PFI is 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. These devices also feature a watchdog timer pin (WDI) that monitors processor activity and asserts RESET if the processor is inactive longer than the watchdog timeout period.