SUMMARY DESCRIPTION

The M48T512Y/V TIMEKEEPER? RAM is a 512Kb x 8 non-volatile static RAM and real time clock organized as 524,288 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution.

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)

– M48T512Y: VCC = 4.5 to 5.5V

4.2V ≤ VPFD ≤ 4.5V

– M48T512V*: 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

■ PIN AND FUNCTION COMPATIBLE WITH

INDUSTRY STANDARD 512K x 8 SRAMS

■ SELF-CONTAINED BATTERY AND

CRYSTAL IN DIP PACKAGE