M48T58, M48T58Y

Summary description

5/31

1

Summary description

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 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

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” (see Table 17 on page 29).

Figure 1.

Logic diagram

AI01374B

13

A0-A12

W

DQ0-DQ7

VCC

M48T58

M48T58Y

G

E2

VSS

8

E1

FT