M41T256YMT7屬于集成電路（IC）的實(shí)時時鐘。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的M41T256YMT7實(shí)時時鐘實(shí)時時鐘 (RTC) 為幾乎所有需要保持精確時間的電子設(shè)備提供時間和/或日期信息。時鐘類型有二進(jìn)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(shè)。其包含 2 B 至 2 MB 不等的存儲器，接口選項(xiàng)有 I2C、并行、串行、SPI、1 線式、2 線式、3 線式和 4 線式。

SUMMARY DESCRIPTION

The M41T256Y Serial TIMEKEEPER? SRAM is a low power 256 Kbit static CMOS SRAM organized as 32K words by 8 bits. A built-in 32.768kHz oscillator (external crystal controlled) and 8 bytes of the SRAM (see Table 3., page 14) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format.

FEATURES SUMMARY

■ 5V OPERATING VOLTAGE

■ SERIAL INTERFACE SUPPORTS EXTENDED I2C BUS ADDRESSING (400kHz)

■ AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY

■ POWER-FAIL DESELECT VOLTAGES:

– M41T256Y: VCC = 4.5 to 5.5V;

VPFD = 4.2 < VPFD < 4.5V

■ COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, and YEAR

■ PROGRAMMABLE SOFTWARE CLOCK CALIBRATION

■ 32,752 BYTES OF GENERAL PURPOSE RAM

■ MICROPROCESSOR POWER-ON RESET

■ HOLDS MICROPROCESSOR IN RESET UNTIL SUPPLY VOLTAGE REACHES STABLE OPERATING LEVEL

■ AUTOMATIC ADDRESS-INCREMENTING

■ TAMPER INDICATION CIRCUIT WITH TIMESTAMP

■ SLEEP MODE FUNCTION

■ PACKAGING INCLUDES A 44-LEAD SOIC AND SNAPHAT? TOP (to be ordered separately)

■ SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT? TOP WHICH CONTAINS THE BATTERY AND CRYSTAL