M48T08, M48T08Y, M48T18

Summary description

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Summary description

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 solution.

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

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” (see Table 17 on page 28).

Figure 1.

Logic diagram

AI01020

13

A0-A12

W

DQ0-DQ7

VCC

M48T08

M48T08Y

M48T18

G

E2

VSS

8

E1

INT