M40Z111 データシートの表示（PDF） - STMicroelectronics

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M40Z111

5 V or 3 V NVRAM supervisor for up to two LPSRAMs

STMicroelectronics 

M40Z111, M40Z111W

1

Description

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 VCC input for an out-of-tolerance

condition.

When an invalid VCC condition occurs, the conditioned chip enable (ECON) output is forced

inactive to write-protect the stored data in the SRAM.

During a power failure,

SNAPHAT® to provide

the

the

SRAM

energy

is switched

required for

from

data

the VCC pin to the lithium cell within the

retention. On a subsequent power-up,

the SRAM remains write protected until a valid power condition returns.

t(s) The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct

connection to a separate SNAPHAT housing containing the battery. The unique design

c allows the SNAPHAT battery package to be mounted on top of the SOIC package after the

du completion of the surface mount process.

ro Insertion of the SNAPHAT housing after reflow prevents potential battery damage due to the

P high temperatures required for device surface-mounting. The SNAPHAT housing is keyed to

te prevent reverse insertion.

le The SOIC and battery packages are shipped separately in plastic anti-static tubes or in tape

o & reel form. For the 28-lead SOIC, the battery package (e.g., SNAPHAT) part number is

s “M4Z28-BR00SH1” (SNAPHAT housing for 48 mAh battery) or “M4Z32-BR00SH1”

b (SNAPHAT housing for 120 mAh battery).

) - O Figure 1. Logic diagram

ct(s VCC

te Produ THS

Obsole E

M40Z111

M40Z111W

VOUT

ECON

VSS

AI02238B

Doc ID 5676 Rev 5

5/20

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