M48T08 datasheet(4/27 Pages) STMICROELECTRONICS

4 / 27 page

M48T08, M48T08Y, M48T18

4/27

SUMMARY DESCRIPTION

The M48T08/18/08Y TIMEKEEPER® RAM is an

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

which is pin and functional compatible with the

DS1643. The monolithic chip is available in two

special packages to provide a highly integrated

battery backed-up memory and real time clock so-

lution.

The M48T08/18/08Y is a non-volatile pin and func-

tion equivalent to any JEDEC standard 8K 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

M48T08/18/08Y 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 bat-

tery/crystal package (e.g., SNAPHAT) part num-

ber is “M4T28-BR12SH” or “M4T32-BR12SH”

(see Table 17., page 25).

Figure 3. Logic Diagram

Table 1. Signal Names

AI01020

A0-A12

DQ0-DQ7

VCC

M48T08

M48T08Y

M48T18

VSS

INT

A0-A12

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

INT

Power Fail Interrupt (Open Drain)

Chip Enable 1

Chip Enable 2

Output Enable

WRITE Enable

VCC

Supply Voltage

VSS

Ground

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