M48T12 sram equivalent, 16kbit (2 kb x 8) timekeeper sram.
* Integrated, ultra low power SRAM, real-time clock, and power-fail control circuit
* BYTEWIDE™ RAM-like clock access
* BCD coded year, month, day, date, hour.
* Automatic power-fail chip deselect and WRITE protection
* WRITE protect voltages (VPFD = power-fail deselect v.
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