M48T129V(2005) 查看數據表（PDF） - STMicroelectronics

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M48T129V
(Rev.:2005)

5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T129Y

M48T129V

5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER® SRAM

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)

Figure 1. 32-pin Module

32

1

PMDIP32 (PM)

Module

February 2005

1/30

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