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M41ST87W

Part Number	M41ST87W
Manufacturer	STMicroelectronics
Description	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor
Published	Dec 9, 2010
Detailed Description	M41ST87Y M41ST87W 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clea...
Datasheet	M41ST87W PDF File

Overview

M41ST87Y M41ST87W 5.
0 V and 3.
3/3.
0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM 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, da...

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