M48T35AY datasheet(4/25 Pages) STMICROELECTRONICS

4 / 25 page

M48T35AY, M48T35AV

4/25

SUMMARY DESCRIPTION

The M48T35AY/V TIMEKEEPER® RAM is a 32Kb

x 8 non-volatile static RAM and real time clock.

The monolithic chip is available in two special

packages to provide a highly integrated battery

backed-up memory and real time clock solution.

The M48T35AY/V is a non-volatile pin and func-

tion equivalent to any JEDEC standard 32Kb 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

M48T35AY/V 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/crystal 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 “M4T28-BR12SH”

(see Table 17., page 23).

Figure 3. Logic Diagram

Table 1. Signal Names

AI02797B

A0-A14

DQ0-DQ7

VCC

M48T35AY

M48T35AV

VSS

A0-A14

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

Chip Enable

Output Enable

WRITE Enable

VCC

Supply Voltage

VSS

Ground

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