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M40Z300MH1TR Folha de dados(PDF) 2 Page - STMicroelectronics

Nome de Peças M40Z300MH1TR
Descrição Electrónicos  NVRAM CONTROLLER for up to EIGHT LPSRAM
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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M40Z300, M40Z300W
2/16
When an invalid VCC condition occurs, the condi-
tioned chip enable outputs (E1CON to E4CON ) are
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, 330 mil SOIC provides sockets with
gold plated contacts for direct connection to a sep-
arate SNAPHAT housing containing the battery.
The SNAPHAT housing has gold plated pins
which mate with the sockets, ensuring reliable
connection. The housing is keyed to prevent im-
proper insertion. This unique design allows the
SNAPHAT battery package to be mounted on top
of the SOIC package after the completion of the
surface mount process which greatly reduces the
board manufacturing process complexity of either
directly soldering or inserting a battery into a sol-
dered holder. Providing non-volatility becomes a
"SNAP".
The 16 pin SOIC provides battery pins for an ex-
ternal user supplied battery.
Figure 2A. SOIC28 Connections
AI02243
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
BL
NC
A
NC
B
RST
NC
NC
NC
E1CON
NC
E3CON
E
E2CON
NC
NC
NC
NC
THS
NC
VSS
E4CON
NC
NC
VOUT
VCC
M40Z300
M40Z300W
Table 1. Signal Names
THS
Threshold Select Input
E
Chip Enable Input
E1CON-E4CON
Conditioned Chip Enable Output
A, B
Decoder Inputs
RST
Reset Output (Open Drain)
BL
Battery Low Output (Open Drain)
VOUT
Supply Voltage Output
VCC
Supply Voltage
VSS
Ground
B+
Positive Battery Pin
B–
Negative Battery Pin
NC
Not Connected Internally
Figure 2B. SOIC16 Connections
AI03624
8
2
3
4
5
6
710
16
15
14
13
12
11
1
A
RST
B
E1CON
E
E2CON
B– (B+)
VSS
NC
VOUT
VCC
M40Z300
M40Z300W
BL
THS
E3CON
E4CON
9
B+ (B–)
( ) = M40Z300W


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