DESCRIPTION
The M48T08,18 TIMEKEEPER™ RAM is an 8K x 8 non-volatile static RAM and real time clock which is pin and functional compatible with the MK48T08,18. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.

■ INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK and POWER-FAIL CONTROL CIRCUIT
■ BYTEWIDE RAM-LIKE CLOCK ACCESS
■ BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES and SECONDS
■ CLOCK ACCURACY of ± 1 MINUTE a MONTH, @ 25°C
■ SOFTWARE CONTROLLED CLOCK
■ CALIBRATION for HIGH ACCURACY APPLICATIONS
■ AUTOMATICPOWER-FAIL CHIP DESELECT and WRITE PROTECTION
■ CHOICE of TWO WRITE PROTECT VOLTAGES:
   – M48T08: 4.5V ≤ VPFD ≤ 4.75V
   – M48T18: 4.2V ≤ VPFD ≤ 4.5V
■ SELF CONTAINED BATTERY and CRYSTAL in the CAPHAT DIP PACKAGE
■ SMALL OUTLINE PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT HOUSING CONTAINING the BATTERY and CRYSTAL
■ SNAPHAT HOUSING (BATTERY and CRYSTAL) REPLACEABLE
■ 10 YEARS of DATA RETENTION and CLOCK OPERATION in the ABSENCE of POWER
■ PIN and FUNCTION COMPATIBLE with JEDEC STANDARD 8K x 8 SRAMs