SUMMARY DESCRIPTION
The M48T128Y/V TIMEKEEPER® RAM is a 128Kb x 8 non-volatile static RAM and real time clock. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The M48T128Y/V directly replaces industry standard 128Kb x 8 SRAM.

FEATURES SUMMARY
■ INTEGRATED, ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY, AND CRYSTAL
■ BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, AND SECONDS
■ AUTOMATIC POWER-FAIL CHIP DESELECT AND WRITE PROTECTION
■ WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage):
    – M48T128Y: VCC = 4.5 to 5.5V 4.1V ≤ VPFD ≤ 4.5V
    – M48T128V*: VCC = 3.0 to 3.6V 2.7V ≤ VPFD ≤ 3.0V
■ CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES
■ SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS
■ 10 YEARS OF DATA RETENTION AND CLOCK OPERATION IN THE ABSENCE OF POWER
■ SELF-CONTAINED BATTERY AND CRYSTAL IN THE DIP PACKAGE
■ PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD 128K x 8 SRAMs