M40Z111MH6 STMICROELECTRONICS [STMicroelectronics], M40Z111MH6 Datasheet - Page 3

• Manufacturer Part Number: M40Z111MH6
• Description: 5V OR 3V NVRAM SUPERVISOR FOR UP TO TWO LPSRAMs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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 V
dition.
When an invalid V
tioned chip enable (E
to write-protect the stored data in the SRAM.
During a power failure, the SRAM is switched from
the V
SNAPHAT
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-
Figure 2. Logic Diagram
CC
THS
E
®
pin to the lithium cell within the
to provide the energy required for
CC
input for an out-of-tolerance con-
CC
V CC
M40Z111W
V SS
M40Z111
CON
condition occurs, the condi-
) output is forced inactive
V OUT
E CON
AI02238B
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).
Table 1. Signal Names
Figure 3. SOIC28 Connections
E
V
THS
V
V
NC
CON
OUT
E
CC
SS
V OUT
V CC
V CC
THS
V SS
NC
NC
NC
NC
NC
NC
NC
NC
NC
Threshold Select Input
Chip Enable Input
Conditioned Chip Enable Output
Supply Voltage Output
Supply Voltage
Ground
Not Connected Internally
1
2
3
4
5
6
7
8
9
10
11
12
13
14
M40Z111W
M40Z111
M40Z111, M40Z111W
AI02239B
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V CC
E
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
E CON
NC
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