M48T58Y datasheet(4/27 Pages) STMICROELECTRONICS

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M48T58, M48T58Y

4/27

SUMMARY DESCRIPTION

The M48T58/Y TIMEKEEPER® RAM is a 8Kb x 8

non-volatile static RAM and real time clock. The

monolithic chip is available in two special packag-

es to provide a highly integrated battery backed-up

memory and real time clock solution.

The M48T58/Y is a non-volatile pin and function

equivalent to any JEDEC standard 8Kb 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 28-pin, 600mil DIP CAPHAT™ houses the

M48T58/Y silicon with a quartz crystal and a long

life lithium button cell in a single package.

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 and crystal. 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. Inser-

tion of the SNAPHAT housing after reflow pre-

vents potential battery and crystal damage due to

the high temperatures required for device surface-

mounting. The SNAPHAT housing is keyed to pre-

vent reverse insertion. The SOIC and battery/crys-

tal 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

“M4T28-

BR12SH” (see Table 13, page 21).

Figure 3. Logic Diagram

Table 1. Signal Names

AI01374B

A0-A12

DQ0-DQ7

VCC

M48T58

M48T58Y

VSS

A0-A12

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

Frequency Test Output (Open

Drain)

Chip Enable 1

Chip Enable 2

Output Enable

WRITE Enable

VCC

Supply Voltage

VSS

Ground

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