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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

■ INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL

CONTROL CIRCUIT, AND BATTERY

■ FREQUENCY TEST OUTPUT FOR REAL

TIME CLOCK SOFTWARE CALIBRATION

■ AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

■ WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

– M48T59: VCC = 4.75 to 5.5V

4.5V ≤ VPFD ≤ 4.75V

– M48T59Y: VCC = 4.5 to 5.5V

4.2V ≤ VPFD ≤ 4.5V

– M48T59V*: VCC = 3.0 to 3.6V

2.7V ≤ VPFD ≤ 3.0V

■ SELF-CONTAINED BATTERY AND

CRYSTAL IN THE CAPHAT? DIP

PACKAGE

■ PACKAGING INCLUDES A 28-LEAD SOIC

AND SNAPHAT? TOP (to be ordered

separately)

■ SOIC PACKAGE PROVIDES DIRECT

CONNECTION FOR A SNAPHAT TOP

WHICH CONTAINS THE BATTERY AND

CRYSTAL

■ MICROPROCESSOR POWER-ON RESET

(Valid even during battery back-up mode)

■ PROGRAMMABLE ALARM OUTPUT

ACTIVE IN THE BATTERY BACK-UP MODE

■ BATTERY LOW FLAG