M41ST87WSS6F STMicroelectronics, M41ST87WSS6F Datasheet - Page 6
![IC SUPERVISOR RTC/NVRAM 20-SSOP](/photos/37/60/376091/ssop-20_sml.jpg)
M41ST87WSS6F
Manufacturer Part Number
M41ST87WSS6F
Description
IC SUPERVISOR RTC/NVRAM 20-SSOP
Manufacturer
STMicroelectronics
Type
Clock/Calendar/Supervisorr
Specifications of M41ST87WSS6F
Memory Size
160B
Time Format
HH:MM:SS:hh (24 hr)
Date Format
YY-MM-DD-dd
Interface
I²C, 2-Wire Serial
Voltage - Supply
2.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-SSOP
Function
Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
Rtc Memory Size
1280 bit
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.7 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Rtc Bus Interface
Serial
Supply Current
500 nA
Clock Format
Ss
Clock Ic Type
RTC
Interface Type
I2C
Memory Configuration
128 X 8
Supply Voltage Range
2.7V To 3.6V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-10616-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
M41ST87WSS6F
Manufacturer:
FSC
Quantity:
6 000
Part Number:
M41ST87WSS6F
Manufacturer:
ST
Quantity:
20 000
Description
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Description
The M41ST87Y/W secure serial RTC and NVRAM supervisor is a low power 1280-bit, static
CMOS SRAM organized as 160 bytes by 8 bits. A built-in 32.768 kHz oscillator (internal
crystal-controlled) and 8 bytes of the SRAM (see
function and are configured in binary coded decimal (BCD) format.
An additional 11 bytes of RAM provide calibration, status/control of alarm, watchdog,
tamper, and square wave functions. 8 bytes of ROM and finally 128 bytes of user RAM are
also provided. Addresses and data are transferred serially via a two line, bidirectional I
interface. The built-in address register is incremented automatically after each WRITE or
READ data byte. The M41ST87Y/W has a built-in power sense circuit which detects power
failures and automatically switches to the battery supply when a power failure occurs. The
energy needed to sustain the SRAM and clock operations can be supplied by a small lithium
button-cell supply when a power failure occurs.
Functions available to the user include a non-volatile, time-of-day clock/calendar, alarm
interrupts, tamper detection, watchdog timer, and programmable square wave output. Other
features include a power-on reset as well as two additional debounced inputs (RSTIN1 and
RSTIN2) which can also generate an output reset (RST). The eight clock address locations
contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a
second in 24-hour BCD format. Corrections for 28, 29 (leap year), 30 and 31 day months are
made automatically.
Security features
Two fully independent tamper detection Inputs allow monitoring of multiple locations within
the system. User programmable bits provide both normally open and normally closed switch
monitoring. Time stamping of the tamper event is automatically provided. There is also an
option allowing data stored in either internal memory (128 bytes), and/or external memory to
be cleared, protecting sensitive information in the event tampering occurs. By embedding
the 32 kHz crystal in the SOX28 package, the clock is completely isolated from external
tampering. An oscillator fail bit (OF) is also provided to ensure correct operation of the
oscillator.
The M41ST87Y/W is supplied in a 28-pin, 300 mil SOIC package (MX) which includes an
embedded 32 kHz crystal and a 20-pin SSOP package (SS) for use with an external crystal.
The SOIC and SSOP packages are shipped in plastic anti-static tubes or in tape & reel form.
The 300 mil, embedded crystal SOIC requires only a user-supplied battery to provide non-
volatile operation.
Doc ID 9497 Rev 8
Table 7
) are used for the clock/calendar
M41ST87Y, M41ST87W
2
C