M41T256Y

www.DataSheet4U.com M41T256Y 256 Kbit (32K x8) Serial RTC 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 Figure 1. 44-pin, Hatless SOIC Package 44 1 SO44 (MT) Figure 2. 44-pin SOIC Package SNAPHAT (SH) Crystal/Battery 44 1 SOH44 (MH) June 2004 1/27 M41T256Y TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. 44-pin, Hatless SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. 44-pin SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . ....