M40Z300MH STMICROELECTRONICS [STMicroelectronics], M40Z300MH Datasheet - Page 2

• Manufacturer Part Number: M40Z300MH
• Description: NVRAM CONTROLLER for up to EIGHT LPSRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M40Z300, M40Z300W
Figure 2A. SOIC28 Connections
Table 1. Signal Names
2/16
THS
E
E1
A, B
RST
BL
V
V
V
B+
B–
NC
OUT
CC
SS
CON
V OUT
-E4
RST
THS
V SS
NC
NC
NC
NC
NC
NC
NC
BL
CON
A
B
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Threshold Select Input
Chip Enable Input
Conditioned Chip Enable Output
Decoder Inputs
Reset Output (Open Drain)
Battery Low Output (Open Drain)
Supply Voltage Output
Supply Voltage
Ground
Positive Battery Pin
Negative Battery Pin
Not Connected Internally
M40Z300W
M40Z300
AI02243
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V CC
E
NC
NC
NC
E1 CON
E2 CON
NC
E3 CON
NC
NC
NC
E4 CON
NC
Figure 2B. SOIC16 Connections
When an invalid V
tioned chip enable outputs (E1
forced inactive to write-protect the stored data in
the SRAM. During a power failure, the SRAM is
switched from the V
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.
( ) = M40Z300W
V OUT
RST
THS
V SS
NC
BL
A
B
1
2
3
4
5
6
7
8
CC
M40Z300W
CC
M40Z300
condition occurs, the condi-
pin to the lithium cell within
16
15
14
13
12
11
10
CON
9
to E4
V CC
B+ (B–)
E
E1 CON
E2 CON
E3 CON
E4 CON
B– (B+)
CON
AI03624
) are