November 2008 Rev 31/16
M4T28-BR12SH
M4T32-BR12SH
TIMEKEEPER ® SNAPHA T ® (battery and crystal)
Features
■Provides battery backup power for non-volatile TIMEKEEPER ® and supervisor devices in the
28- or 44-pin SNAPHAT ® SOIC package生产性活动 ■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
■Keyed insertion to ensure proper assemblytopmodel
■Removable for replacement and proper disposal
■Pb-free package
■
Available in Ecopack ® packages, tubes or tape
& reel
www.st
新美国梦
Contents M4T28-BR12SH, M4T32-BR12SH
Contents
1Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4Mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1Battery characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2UL recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3Battery life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6Part numbering . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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M4T28-BR12SH, M4T32-BR12SH List of tables List of tables
激情5月天Table 1.Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 2.Absolute maximum ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3.Operating and AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4.SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package mechanical data 11 Table 5.SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal,
package mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 6.Ordering information scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 7.Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3/16
List of figures M4T28-BR12SH, M4T32-BR12SH List of figures
Figure 1.Logic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2.SNAPHAT® insertion/extraction forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 3.Battery discharge rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 4.DIP extractor tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 5.SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package outline . . . . . . . . 11 Figure 6.SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package outline . . . . . . . 12 Figure 7.Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4/16
M4T28-BR12SH, M4T32-BR12SH Description 1 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
江杨清the battery and crystal from being exposed to the high temperatures of the surface mount
process.
Table 1.Signal names
X1Crystal input
X2Crystal output
V BA T–Negative voltage
人体芝术
V BA T+Positive voltage
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