M40SZ100WMH6E STMICROELECTRONICS [STMicroelectronics], M40SZ100WMH6E Datasheet - Page 5

• Manufacturer Part Number: M40SZ100WMH6E
• Description: 5 V or 3 V NVRAM supervisor for LPSRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M40SZ100Y, M40SZ100W
1
Caution:
Description
The M40SZ100Y/W NVRAM controller 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
When an invalid V
inactive to write protect the stored data in the SRAM. During a power failure, the SRAM is
switched from the V
the 16-lead SOIC) 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 separate SNAPHAT
plated pins which mate with the sockets, ensuring reliable connection. The housing is keyed
to prevent improper 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 soldered holder. Providing non-volatility becomes a
“SNAP.” This feature is also available in the “topless” 16-pin SOIC package (MQ).
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 also
keyed to prevent reverse insertion.
The 28-pin SOIC and battery packages are shipped separately in plastic anti-static tubes or
in tape & reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part
number is M4Z28-BR00SH (for 48 mAh battery) or M4Z32-BR00SH (for 120 mAh battery).
Do not place the SNAPHAT battery top in conductive foam, as this will drain the lithium
button-cell battery.
Figure 1.
1. For 16-pin SOIC package only.
Logic diagram
CC
input for an out-of-tolerance condition.
CC
CC
condition occurs, the conditioned chip enable output (E
®
pin to the lithium cell within the SNAPHAT
housing containing the battery. The SNAPHAT housing has gold
RSTIN
PFI
E
Doc ID 7528 Rev 3
M40SZ100W
V CC
M40SZ100Y
V SS
V BAT
(1)
V OUT
BL
E CON
PFO
RST
®
(or external battery for
CON
Description
) is forced
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