Àû²©¡¤(¼¯ÍÅ)ÓÐÏÞ¹«Ë¾¹ÙÍø

DESCRIPTION

The M48T129Y/V TIMEKEEPER RAM is a 128Kb x 8 non-volatile static RAM and real time clock, with programmable alarms and a watchdog timer. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The M48T129Y/V directly replaces industry standard 128Kb x 8 SRAM. It also provides the non-volatility of Flash without any requirement for special write timing or limitations on the number of writes that can be performed.

¡ö INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY AND CRYSTAL

¡ö YEAR 2000 COMPLIANT

¡ö BCD CODED CENTURY, YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS

¡ö BATTERY LOW WARNING FLAG

¡ö AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION

¡ö TWO WRITE PROTECT VOLTAGES: (VPFD = Power-fail Deselect Voltage)

¨C M48T129Y: 4.2V ¡Ü VPFD ¡Ü 4.5V

¨C M48T129V: 2.7V ¡Ü VPFD ¡Ü 3.0V

¡ö CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES

¡ö SOFTWARE CONTROLLED CLOCK CALIBRATION for HIGH ACCURACY APPLICATIONS

¡ö 10 YEARS of DATA RETENTION and CLOCK OPERATION in the ABSENCE of POWER

¡ö SELF CONTAINED BATTERY and CRYSTAL in DIP PACKAGE

¡ö MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode)

¡ö PROGRAMMABLE ALARM OUTPUT ACTIVE in BATTERY BACK-UP MODE

¡ö SURFACE MOUNT CHIP SET PACKAGING INCLUDES a 44-PIN SOIC and a 32-LEAD TSOP (SNAPHAT TOP TO BE ORDERED SEPARATELY)

¡ö SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT TOP WHICH CONTAINS the BATTERY and CRYSTAL

¡ö SNAPHAT? HOUSING (BATTERY/CRYSTAL) IS REPLACEABLE