stm704 5伏的電池切換

the stm690a/692a/703/704/802/805/817/818/819 supervisors are self-contained devices which provide microprocessor supervisory functions with the ability to non-volatize and write-protect external lpsram. a precision voltage reference and comparator monitors the vcc input for an out-of-tolerance condition. when an invalid vcc condition occurs, the reset output (rst) is forced low (or high in the case of rst). these devices also offer a watchdog timer (except for stm703/704/819) as well as a power-fail comparator (except for stm818) to provide the system with an early warning of impending power failure.

these devices are available in a standard 8-pin soic package or a space-saving 8-pin tssop package.

stm704 產品特性:

• 5 v operating voltage
• nvram supervisor for external lpsram
• chip-enable gating (stm818 only) for external lpsram (7 ns max prop delay)
• rst and rst outputs
• 200 ms (typ) trec
• watchdog timer - 1.6 sec (typ)
• automatic battery switchover
• low battery supply current - 0.4 μa (typ)
• power-fail comparator (pfi/pfo)
• low supply current - 40 μa (typ)
• guaranteed rst (rst) assertion down to vcc = 1.0 v
• operating temperature:
  –40°c to +85°c (industrial grade)
• rohs compliance
  – lead-free components are compliant with the rohs directive.

stm704 訂購型號:

stm704 技術支持

1. stm704 數據手冊datasheet 下載.pdf
2. 微處理器監控器選型指南
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