STMicroelectronics M41ST87Y
5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor
| Part No. | M41ST87Y |
|---|---|
| Datasheet | M41ST87Y Download |
| Manufacturer |  STMicroelectronics |
| Description | 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor |
| Buy | Stock & Price |
FEATURES
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● 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 clearable, general purpose NVRAM Programmable alarm and interrupt function (valid even during battery backup mode) Programmable watchdog timer Unique electronic serial number (8-byte) 32 kHz frequency output available upon poweron Microprocessor power-on reset output Battery low flag Ultra-low battery supply current of 500 nA (typ) Embedded crystal 28-pin, (300 mil) SOX28 (MX)
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