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M4Z28-BR00SH1 Scheda tecnica(PDF) 5 Page - STMicroelectronics

Il numero della parte M4Z28-BR00SH1
Spiegazioni elettronici  5V or 3V NVRAM supervisor for up to two LPSRAMs
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M4Z28-BR00SH1 Scheda tecnica(HTML) 5 Page - STMicroelectronics

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M40Z111, M40Z111W
Description
5/21
1
Description
The M40Z111/W NVRAM supervisor is a self-contained device which converts a standard
low-power SRAM into a non-volatile memory.
A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance
condition.
When an invalid VCC condition occurs, the conditioned chip enable (ECON) output is forced
inactive to write-protect the stored data in the SRAM.
During a power failure, the SRAM is switched from the VCC pin to the lithium cell within the
SNAPHAT® to provide the energy required for data retention. On a subsequent power-up,
the SRAM remains write protected until a valid power condition returns.
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. 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 damage due to the
high temperatures required for device surface-mounting. The SNAPHAT housing is keyed to
prevent reverse insertion.
The SOIC and battery packages are shipped separately in plastic anti-static tubes or in Tape
& Reel form. For the 28-lead SOIC, the battery package (e.g., SNAPHAT) part number is
“M4Z28-BR00SH1” or “M4Z32-BR00SH1” (See Table 11 on page 19).
Figure 1.
Logic diagram
AI02238B
THS
VCC
M40Z111
M40Z111W
ECON
VSS
E
VOUT


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