M48T248VPM中文资料意法半导体数据手册PDF规格书

SUMMARY DESCRIPTION

The M48T248Y/V TIMEKEEPER® RAM is a 128Kbit x 8 non-volatile static RAM and real time clock organized as 131,072 words by 8 bits.

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):

– M48T248Y: 4.25V ≤ VPFD ≤ 4.50V

– M48T248V: 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

■ 128K x 8 NV SRAM DIRECTLY REPLACES

VOLATILE STATIC RAM OR EEPROM