M48T251Y-70PM1集成電路（IC）的實時時鐘規(guī)格書PDF中文資料

M48T251Y-70PM1屬于集成電路（IC）的實時時鐘。由意法半導(dǎo)體集團制造生產(chǎn)的M48T251Y-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(shè)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(shè)。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。

SUMMARY DESCRIPTION

The M48T251Y/V TIMEKEEPER? RAM is a 512Kbit x 8 non-volatile static RAM and real time clock organized as 524,288 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. In the event of power instability or absence, a self-contained battery maintains the timekeeping operation and provides power for a CMOS static RAM. Control circuitry monitors VCC and invokes write protection to prevent data corruption in the memory and RTC.

FEATURES SUMMARY

■ 5.0V OR 3.3V OPERATING VOLTAGE

■ REAL TIME CLOCK KEEPS TRACK OF TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAYS, DATE OF THE MONTH, MONTHS, AND YEARS

■ AUTOMATIC LEAP YEAR CORRECTION VALID UP TO THE YEAR 2100

■ AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY

■ CHOICE OF POWER-FAIL DESELECT VOLTAGES: (VPFD = Power-fail Deselect Voltage):

– M48T251Y: 4.25V ≤ VPFD ≤ 4.50V

– M48T251V: 2.80V ≤ VPFD ≤ 2.97V

■ FULL 10 VCC OPERATING RANGE

■ OVER 10 YEARS’ DATA RETENTION IN THE ABSENCE OF POWER

■ WATCH FUNCTION IS TRANSPARENT TO RAM OPERATION

■ 512K x 8 NV SRAM DIRECTLY REPLACES VOLATILE STATIC RAM OR EEPROM