M48T129V-85PM1

DESCRIPTION

The M48T129Y/V TIMEKEEPER® RAM is a 128 Kb x 8 non-volatile static RAM and real-time clock with programmable alarms and a watchdog timer.

FEATURES SUMMARY
■ INTEGRATED, ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL
CONTROL CIRCUIT, BATTERY, AND
CRYSTAL
■ YEAR 2000 COMPLIANT
■ BCD CODED CENTURY, YEAR, MONTH,
DAY, DATE, HOURS, MINUTES, AND
SECONDS
■ BATTERY LOW WARNING FLAG
■ AUTOMATIC POWER-FAIL CHIP
DESELECT AND WRITE PROTECTION
■ TWO WRITE PROTECT VOLTAGES:
(VPFD = Power-fail Deselect Voltage)
– M48T129Y: VCC = 4.5 to 5.5V
4.2V ≤ VPFD ≤ 4.5V
– M48T129V: 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 DIP PACKAGE
■ MICROPROCESSOR POWER-ON RESET
(Valid even during battery back-up mode)
■ PROGRAMMABLE ALARM OUTPUT
ACTIVE IN BATTERY BACK-UP MODE
■ SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP
WHICH CONTAINS THE BATTERY AND
CRYSTAL
■ SNAPHAT HOUSING (BATTERY/CRYSTAL)
IS REPLACEABLE
■ EQUIVALENT SURFACE-MOUNT (SMT)
SOLUTION REQUIRES A 44-PIN M48T201Y/
V AND A STAND-ALONE 128K x8 LPSRAM
(SNAPHAT® Top to be ordered separately)