M48T129Y

M48T129Y M48T129V 5.0 or 3.3 V, 1 Mbit (128 Kbit x 8) TIMEKEEPER® SRAM Not recommended for new design Features ■ Integrated, ultra low power SRAM, real-time clock, power-fail control circuit, battery, and crystal )■ BCD coded century, year, month, day, date, t(shours, minutes, and seconds c■ Battery low warning flag du■ Automatic power-fail chip deselect and WRITE roprotection P■ Two WRITE protect voltages: te(VPFD = power-fail deselect voltage) le– M48T129Y: VCC = 4.5 to 5.5 V; 4.2 V ≤ VPFD ≤ 4.5 V so– M48T129V: VCC = 3.0 to 3.6 V; b2.7 V ≤ VPFD ≤ 3.0 V O■ Conventional SRAM operation; unlimited -WRITE cycles t(s)■ Software controlled clock calibration for high accuracy applications uc■ 10 years of data retention and clock operation din the absence of power ro■ Self-contained battery and crystal in DIP Ppackage te■ Microprocessor power-on reset le(valid even during battery backup mode) so■ Programmable alarm output active in battery Obbackup mode...