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M41T11 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M41T11
Description  Serial Real Time Clock with 56 Bytes of NVRAM
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com

M41T11 Datasheet(HTML) 5 Page - STMicroelectronics

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Summary description
Summary description
The M41T11is a low power Serial Real Time Clock with 56 bytes of NVRAM. A built-in
32.768kHz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used
for the clock/calendar function and are configured in binary coded decimal (BCD) format.
Addresses and data are transferred serially via a two-line bi-directional bus. The built-in
address register is incremented automatically after each write or read data byte.
The M41T11 clock has a built-in power sense circuit which detects power failures and
automatically switches to the battery supply during power failures. The energy needed to
sustain the RAM and clock operations can be supplied from a small lithium coin cell.
Typical data retention time is in excess of 5 years with a 50mA/h 3V lithium cell. The
M41T11 is supplied in 8 lead Plastic Small Outline package or 28 lead SNAPHAT® package.
The 28-pin, 330mil SOIC provides sockets with gold plated contacts at both ends for direct
connection to a separate SNAPHAT housing containing the battery and crystal. The unique
design allows the SNAPHAT battery package to be mounted on top of the SOIC package
after the completion of the surface mount process. Insertion of the SNAPHAT housing after
reflow prevents potential battery and crystal damage due to the high temperatures required
for device surface-mounting. The SNAPHAT housing is keyed to prevent reverse insertion.
The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or
in Tape & Reel form.
For the 28-lead SOIC, the battery/crystal package (i.e. SNAPHAT) part number is “M4Txx-
BR12SH” (see Table 16 on page 27).
Do not place the SNAPHAT battery/crystal package “M4Txx-BR12SH” in conductive foam
since this will drain the lithium button-cell battery.
Figure 1.
Logic diagram

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