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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