M41T94 - ST Microelectronics

M41T94 512 Bit 64 bit x8 SERIAL RTC SPI SRAM

. . . . . 4 Figure 3. Logic Diagram . . . . 5 Table 1. Signal Names . . .

Features

SUMMARY s 2.7 TO 5.5V OPERATING VOLTAGE s s Figure 1. 16-pin SOIC Package SERIAL PERIPHERAL INTERFACE (SPI) 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE AUTOMATIC SWITCH-OVER and DESELECT CIRCUITRY CHOICE OF POWER-FAIL DESELECT VOLTAGES (VCC = 2.7 to 5.5V):
  – THS = VSS; 2.55V ≤ VPFD ≤ 2.70V
  – THS = VCC; 4.20V ≤ VPFD ≤ 4.50V Figure 2. 28-pin SOIC Package 16 1 s SO16 (MQ) s s 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) W.