M48Z128V datasheet(3/21 Pages) STMICROELECTRONICS

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M48Z128, M48Z128Y, M48Z128V*

DESCRIPTION

The M48Z128/Y/V ZEROPOWER® RAM is a

128 Kbit x 8 non-volatile static RAM organized

as131,072 words by 8 bits. The device combines

an internal lithium battery, a CMOS SRAM and a

control circuit in a plastic, 32-pin DIP module. This

solution is available in two special packages to

provide a highly integrated battery backed-up

memory solution.

The M48Z128/Y/V is a non-volatile pin and func-

tion equivalent to any JEDEC standard 128K x 8

SRAM. It also easily fits into many ROM, EPROM,

and EEPROM sockets, providing the non-volatility

of PROMs without any requirement for special

WRITE timing or limitations on the number of

WRITEs that can be performed. The 32-pin,

600mil DIP Module houses the M48Z128/Y/V sili-

con with a long life lithium button cell in a single

package.

For surface-mount environments ST provides an

equivalent SMT solution consisting of a 28-pin,

330mil SOIC NVRAM SUPERVISOR (M40Z300/

W) and a 32-pin, (TSOP, 8 x 20mm) 1Mb

LPSRAM. Both 5V and 3V versions are available

(see Table 2, page 5).

The 28-pin, 330mil SOIC provides sockets with

gold plated contacts at both ends for direct con-

nection to a separate SNAPHAT® housing con-

taining the battery.

The unique design allows the SNAPHAT battery

package to be mounted on top of the SOIC pack-

age after the completion of the surface-mount pro-

cess. 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 keyed to pre-

vent reverse insertion.

The SNAPHAT battery package is shipped sepa-

rately in plastic anti-static tubes or in Tape & Reel

form. The part number is “M4Zxx-BR00SH” (see

Table 13, page 15).

Figure 2. Logic Diagram

Table 1. Signal Names

AI01194

A0-A16

DQ0-DQ7

VCC

M48Z128

M48Z128Y

M48Z128V

VSS

A0-A16

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

Chip Enable Input

Output Enable Input

WRITE Enable Input

VCC

Supply Voltage

VSS

Ground

Not Connected Internally

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