m48t37v STMicroelectronics, m48t37v Datasheet - Page 5

• Manufacturer Part Number: m48t37v
• Description: 5.0 Or 3.3v, 256 Kbit 32 Kbit X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

1
Caution:
Summary description
The M48T37Y/V TIMEKEEPER
clock. The monolithic chip is available in a special package which provides a highly
integrated battery backed-up memory and real time clock solution.
The 44-lead, 330mil 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
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” (see
Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the
lithium button-cell battery.
Figure 1.
Logic diagram
A0-A14
WDI
W
G
E
®
15
RAM is a 32 Kb x8 non-volatile static RAM and real time
®
V CC
V SS
M48T37Y
M48T37V
battery/crystal package to be mounted on top of
8
Table 18 on page
DQ0-DQ7
RST
IRQ/FT
AI02172
27).
5/29