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M40Z111MH6TR データシート(PDF) 3 Page - STMicroelectronics

部品番号 M40Z111MH6TR
部品情報  5V OR 3V NVRAM SUPERVISOR FOR UP TO TWO LPSRAMs
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M40Z111MH6TR データシート(HTML) 3 Page - STMicroelectronics

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M40Z111, M40Z111W
SUMMARY 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 con-
dition.
When an invalid VCC condition occurs, the condi-
tioned 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 con-
nection to a separate SNAPHAT housing contain-
ing 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-mount-
ing. The SNAPHAT housing is keyed to prevent
reverse insertion.
The SOIC and battery packages are shipped sep-
arately 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-
BR00SH” or “M4Z32-BR00SH” (See Table 8,
page 10).
Figure 2. Logic Diagram
Table 1. Signal Names
Figure 3. SOIC28 Connections
AI02238B
THS
VCC
M40Z111
M40Z111W
ECON
VSS
E
VOUT
THS
Threshold Select Input
E
Chip Enable Input
ECON
Conditioned Chip Enable Output
VOUT
Supply Voltage Output
VCC
Supply Voltage
VSS
Ground
NC
Not Connected Internally
AI02239B
8
2
3
4
5
6
7
9
10
11
12
13
14
22
21
20
19
18
17
16
15
28
27
26
25
24
23
1
NC
NC
NC
NC
VCC
NC
VCC
NC
NC
NC
NC
NC
NC
NC
E
NC
NC
NC
NC
NC
THS
NC
VSS
ECON
NC
NC
VOUT
VCC
M40Z111
M40Z111W


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