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.

■ 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: 4.2V ≤ VPFD ≤ 4.5V

– M48T129V: 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

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

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

■ SNAPHAT? HOUSING (BATTERY/CRYSTAL) IS REPLACEABLE

M48T129Y-70PM1屬于集成電路（IC） > 實時時鐘。意法半導體（ST）集團制造生產(chǎn)的M48T129Y-70PM1實時時鐘實時時鐘 (RTC) 為幾乎所有需要保持精確時間的電子設備提供時間和/或日期信息。時鐘類型有二進制計數(shù)器、時鐘/日歷/監(jiān)控器、歷時計時器、幻時鐘芯片、便攜式系統(tǒng)控制器、溫度記錄器、時間事件記錄器和計時器時鐘外設。其包含 2 B 至 2 MB 不等的存儲器，接口選項有 I2C、并行、串行、SPI、1 線式、2 線式、3 線式和 4 線式。