M4T28-BR12SH(2003) Просмотр технического описания (PDF) - STMicroelectronics

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производитель

M4T28-BR12SH
(Rev.:2003)

TIMEKEEPER® SNAPHAT® (BATTERY & CRYSTAL)

STMicroelectronics 

M4T28-BR12SH, M4T32-BR12SH

SUMMARY 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 prevents the battery

and crystal from being exposed to the high tem-

peratures of the surface mount process.

Figure 2. Logic Diagram

X1

X2

Table 1. Signal Names

X1

Crystal Input

X2

Crystal Output

VBAT–

Negative Voltage

VBAT+

Positive Voltage

SNAPHAT

VBAT– VBAT+

AI02528

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