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SUMMARY DESCRIPTION

The M48T59/Y/V TIMEKEEPER? RAM is an 8 Kb x8 non-volatile static RAM and real time clock. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.

FEATURES SUMMARY

¡ö INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL

CONTROL CIRCUIT, AND BATTERY

¡ö FREQUENCY TEST OUTPUT FOR REAL

TIME CLOCK SOFTWARE CALIBRATION

¡ö AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

¡ö WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

¨C M48T59: VCC = 4.75 to 5.5V

4.5V ¡Ü VPFD ¡Ü 4.75V

¨C M48T59Y: VCC = 4.5 to 5.5V

4.2V ¡Ü VPFD ¡Ü 4.5V

¨C M48T59V*: VCC = 3.0 to 3.6V

2.7V ¡Ü VPFD ¡Ü 3.0V

¡ö SELF-CONTAINED BATTERY AND

CRYSTAL IN THE CAPHAT? DIP

PACKAGE

¡ö PACKAGING INCLUDES A 28-LEAD SOIC

AND SNAPHAT? TOP (to be ordered

separately)

¡ö SOIC PACKAGE PROVIDES DIRECT

CONNECTION FOR A SNAPHAT TOP

WHICH CONTAINS THE BATTERY AND

CRYSTAL

¡ö MICROPROCESSOR POWER-ON RESET

(Valid even during battery back-up mode)

¡ö PROGRAMMABLE ALARM OUTPUT

ACTIVE IN THE BATTERY BACK-UP MODE

¡ö BATTERY LOW FLAG