M48T08 datasheet(5/31 Pages) STMICROELECTRONICS

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M48T08, M48T08Y, M48T18

Description

Doc ID 2411 Rev 10

5/31

Description

The M48T08/18/08Y TIMEKEEPER® RAM is an 8 K x 8 non-volatile static RAM and real-

time clock which is pin and function compatible with the DS1643. The monolithic chip is

available in two special packages to provide a highly integrated battery-backed memory and

real-time clock solution.

The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard

8 K 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, 600 mil 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, 330 mil SOIC provides sockets with gold-plated contacts at both ends for direct

connection to a separate SNAPHAT® housing containing 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. Insertion of the SNAPHAT® housing after

reflow prevents potential battery and crystal damage due to the high temperatures required

for device surface-mounting. The SNAPHAT® housing is keyed to prevent 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” or “M4T32-BR12SH”.

Figure 1.

Logic diagram

AI01020

A0-A12

DQ0-DQ7

VCC

M48T08

M48T08Y

M48T18

VSS

INT

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