M41ST84Y

M41ST84Y M41ST84W 5.0 or 3.0V, 512 bit (64 x 8) SERIAL RTC with SUPERVISORY FUNCTIONS FEATURES SUMMARY s 5.0 OR 3.0V OPERATING VOLTAGE s Figure 1. 16-pin SOIC Package SERIAL INTERFACE SUPPORTS I2C BUS (400 KHz) OPTIMIZED FOR MINIMAL INTERCONNECT TO MCU 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE AUTOMATIC SWITCH-OVER and DESELECT CIRCUITRY CHOICE OF POWER-FAIL DESELECT VOLTAGES: – M41ST84Y: VCC = 4.5 to 5.5V; 4.20V ≤ VPFD ≤ 4.50V – M41ST84W: VCC = 2.7 to 3.6V; 2.55V ≤ VPFD ≤ 2.70V 1.25V REFERENCE (for PFI/PFO) COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, and CENTURY 44 BYTES OF GENERAL PURPOSE RAM PROGRAMMABLE ALARM and INTERRUPT FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE) WATCHDOG TIMER MICROPROCESSOR POWER-ON RESET BATTERY LOW FLAG ULTRA-LOW BATTERY SUPPLY CURRENT OF 500 nA (max) OPTIONAL PACKAGING INCLUDES A 28LEAD SOIC and SNAPHAT® TOP (to be ordered separately) SNAPHAT PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT TOP, WHICH CONTAINS THE BATTERY and CRYSTAL 28 1 s 16 1 s SO16 (MQ) s s Figure 2. 28-pin SOIC Package* SNAPHAT (SH) Battery & Crystal s s s s SOH28 (MH) s s s s s s * Contact Local Sales Office June 2003 Rev. 4.0 1/31 M41ST84Y, M41ST84W TABLE OF CONTENTS SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 3. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...