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M41ST87W - STMicroelectronics

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M41ST87W 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor

. . . . 6 1.1 Security features . . . . . . . . 6 2 Operating modes . . . . . . . 12 2.1 2-wire bus characteristics . . . . .

Features







■ 5.0, 3.3, or 3.0 V operation 400 kHz I2C bus NVRAM supervisor to non-volatize external LPSRAM 2.5 to 5.5 V oscillator operating voltage Automatic switchover and deselect circuitry Choice of power-fail deselect voltages
  – M41ST87Y: THS = 1: VPFD≈ 4.63 V; VCC = 4.75 to 5.5 V THS = 0: VPFD≈ 4.37 V; VCC = 4.5 to 5.5 V
  – M41ST87W: THS = 1: VPFD ≈ 2.9 V; VCC = 3.0 to 3.6 V THS = 0: VPFD ≈ 2.63 V; VCC = 2.7 to 3.6 V Two independent power-fail comparators (1.25 V reference) Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century 128 bytes of.

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