RTC IC With 114x8 NVSRAM And NVSRAM Control,Real-Time Clock (RTC) With NVRAM Control
The CMOS BQ4285 is Real-Time Clock (RTC) With NVRAM Control a low-power Microprocessor peripheral providing a time-of-day Clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.
The BQ4285 write-protects the Clock calendar, and b8d storage Registers during power failure. A backup battery then maintains data and operates the Clock and calendar.
The BQ4285 is a fully compatible Real-Time Clock for IBM AT-compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.
The BQ4285 integrates a battery-backup controller to make a standard CMOS SRAM nonvolatile during power-fail conditions. During power-fail, the BQ4285 automatically write-protects the external SRAM and provides a VCC output sourced from the Clock backup battery.
By Texas Instruments
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