The M48T18-150PC1 is a TIMEKEEPER? Non-volatile Static RAM and Real-time Clock which is pin and function compatible with the DS1643. This is a non-volatile pin and function equivalent to any JEDEC standard 8K x 8 SRAM. It also easily fits into many ROM, EPROM and EEPROM sockets providing the non-volatility of PROMs without any requirement for special write timing or limitations on the number of write that can be performed.
Integrated ultralow power SRAM, real-time clock, power-fail control circuit and battery
BYTEWIDE?RAM-like clock access
BCD coded year, month, day, date, hours, minutes and seconds
Typical clock accuracy of ±1 minute a month at 25°C
Software controlled clock calibration for high accuracy applications
Automatic power-fail chip deselect and WRITE protection
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