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 V_DD drops below a preset threshold (V_IT), the active low push-pull RESET output asserts, and V_OUT switches from V_DD to V_BAT. When V_DD rises above the trip threshold, V_OUT switches immediately from V_BAT to V_DD. The RESET output remains low until the delay time (t_d) expires. During power on, RESET is asserted when the supply voltage (V_DD or V_BAT) 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 the processor is inactive longer than the watchdog timeout period. If the watchdog timer is not used, the WDI pin should be left floating.

The TPS3617 and TPS3618 are available in an 8-pin MSOP package and are characterized for operation over a temperature range of -40°C to +85°C.

• 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

• Number of supplies monitored
• 1
• Threshold voltage 1 (Typ) (V)
• 4.55
• Features
• Battery backup switchover, Watchdog timer, PFI/PFO
• Reset threshold accuracy (%)
• 2
• Output driver type/reset output
• Active-low, Push-pull
• Time delay (ms)
• 100
• Rating
• Catalog
• Watchdog timer WDI (sec)
• 0.8
• Operating temperature range (C)
• -40 to 125

TPS3618-50的完整型号有：TPS3618-50DGKT，以下是这些产品的关键参数及官网采购报价：

TPS3618-50DGKT，工作温度：-40 to 125，封装：VSSOP (DGK)-8，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网TPS3618-50DGKT的批量USD价格：1.704（1000+）

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