M48T37Y datasheet(5/30 Pages) STMICROELECTRONICS

5 / 30 page

M48T37Y, M48T37V

Description

Doc ID 7019 Rev 9

5/30

Description

The M48T37Y/V TIMEKEEPER® RAM is a 32 Kb x 8 non-volatile static RAM and real-time

clock. The monolithic chip is available in a special package which provides a highly

integrated battery-backed memory and real-time clock solution.

The 44-lead, 330 mil SOIC package 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/crystal 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 packages are shipped separately in plastic anti-static tubes or in tape

& reel form. For the 44-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part

number is “M4T28-BR12SH” or “M4T32-BR12SH”.

Caution:

Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the

lithium button-cell battery.

Figure 1.

Logic diagram

AI02172

DQ0-DQ7

VCC

M48T37Y

M48T37V

VSS

WDI

RST

IRQ/FT

A0-A14

M48T37Y Fiches technique(PDF) 5 Page - STMicroelectronics