M40SZ100Y, M40SZ100W

Description

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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

inactive to write protect the stored data in the SRAM. During a power failure, the SRAM is

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

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 “M4ZXX-BR00SH” (see Table 13 on page 23).

Caution:

Do not place the SNAPHAT battery top in conductive foam, as this will drain the lithium

button-cell battery.

Figure 1.

Logic diagram

1.

For 16-pin SOIC package only.

AI03933

VCC

M40SZ100Y

M40SZ100W

BL

VSS

E

VOUT

PFI

ECON

PFO

RST

RSTIN

VBAT

(1)