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M40Z111, M40Z111W

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

dition.

to write-protect the stored data in the SRAM.

During a power failure, the SRAM is switched from

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-

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).

Figure 2. Logic Diagram

Table 1. Signal Names

Figure 3. SOIC28 Connections

AI02238B

THS

VCC

M40Z111

M40Z111W

ECON

VSS

E

VOUT

THS

Threshold Select Input

E

Chip Enable Input

Conditioned Chip Enable Output

Supply Voltage Output

Supply Voltage

Ground

NC

Not Connected Internally

AI02239B

8

2

3

4

5

6

7

9

10

11

12

13

14

22

21

20

19

18

17

16

15

28

27

26

25

24

23

1

NC

NC

NC

NC

VCC

NC

VCC

NC

NC

NC

NC

NC

NC

NC

E

NC

NC

NC

NC

NC

THS

NC

VSS

ECON

NC

NC

VOUT

VCC

M40Z111

M40Z111W