M4TXX-BR12SH
TIMEKEEPER SNAPHAT (Battery & Crystal)
s
Provides Battery Backup Power for Non-Volatile
TIMEKEEPERs and Controllers in the
SNAPHAT SOIC Package
Removable Battery Avoids Heat Associated
with Surface Mount Process
Snaps Directly onto Surface-Mounted
SNAPHAT SOIC
Choice of Battery Capacities
– M4T28-BR12SH = 48 mAh
– M4T32-BR12SH = 120 mAh
SNAPHAT (SH)
Battery & Crystal
s
s
s
s
s
Keyed Insertion to Insure Proper Assembly
Removable for Replacement and Proper
Disposal
Available in Tubes or Tape & Reel
For Use with the 28 and 44 pin SOIC Versions
of the TIMEKEEPER Product Families
s
s
Figure 1. Logic Diagram
DESCRIPTION
The M4Txx-BR12SH SNAPHAT top is a detach-
able lithium power source for ST’s non-volatile
TIMEKEEPER surface mount SOIC (MH) pack-
age (28 and 44 pin).
The SNAPHAT top contains both the battery and
crystal and is designed to be "snapped on" after
the SOIC is surface mounted on the PC board.
Thus the two piece solution avoids the battery and
crystal from having to be exposed to the high tem-
peratures of the surface mount process.
X1
X2
SNAPHAT
VBAT–
VBAT+
AI02528
November 1999
1/7
STMICROELECTRONICS [ STMICROELECTRONICS ]
