M4T28-BR12SH03 数据手册 ( 数据表 ) - STMicroelectronics

SUMMARY DESCRIPTION
The M4TXX-BR12SH SNAPHAT® top is a detachable lithium power source for ST’s non-volatile
TIMEKEEPER® surface-mount SOIC (MH) package (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 prevents the battery and crystal from being exposed to the high temperatures of the surface mount process.

FEATURES SUMMARY
■ PROVIDES BATTERY BACKUP POWER FOR NON-VOLATILE TIMEKEEPER® and  
    SUPERVISOR DEVICES IN THE 28- OR 44-PIN 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 = 48mAh
   – M4T32-BR12SH = 120mAh
■ KEYED INSERTION TO INSURE PROPER ASSEMBLY
■ REMOVABLE FOR REPLACEMENT and PROPER DISPOSAL
■ Pb-FREE PACKAGE
■ AVAILABLE IN TUBES OR TAPE & REEL