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M41ST87Y fiches techniques PDF

STMicroelectronics - 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor

Numéro de référence M41ST87Y
Description 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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M41ST87Y fiche technique
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: VPFD4.63 V; VCC = 4.75 to 5.5 V
THS = 0: VPFD4.37 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 power-
on
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)
SSOP20 (SS)
Security features
Tamper indication circuits with timestamp and
RAM clear
LPSRAM clear function (TPCLR)
Packaging includes a 28-lead, embedded
crystal SOIC and a 20-lead SSOP
Oscillator stop detection
April 2010
www.DataSheet.in
Doc ID 9497 Rev 8
1/52
www.st.com
1

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