SGS Thomson Microelectronics M4T32-BR12SH1, M4T28-BR12SH1, M4T32-BR12SH6 Datasheet
TIMEKEEPER SNAPHAT (Battery & Crystal)
■ Provides Ba ttery Backup Power for Non -Volatile
TIMEKEEPE Rs 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
■ 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
M4TXX-BR12SH
SNAPHAT (SH)
Battery & Crystal
Figure 1. Logic Diagram
DESCRIPTION
The M4Txx-BR12SH SNAP HAT 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 cont ains 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 temperatures of the surface mount process.
X1 X2
SNAPHAT
V
BAT–VBAT+
AI02528
1/7November 1999
M4TXX-BR12SH
MECHANICAL INFORMATION
Electrical connection to the SOIC is made through
four pins that connect to the four press fitted sockets at each end of the SOIC. Critical contact
points between the pins and sockets are gold-plated to resist oxidation. Internally, each socket contains six independent contact fingers to form
redundant connections between the two components. These sockets were designed with high
point contact force to provide the lowest possible
contact resistance. The SNAPHAT top also incorporates four molded-in retaining clips which hold
onto the ends of the SOIC insuring mechanical
and electrical connection even under severe mechanical shock and vibration. The combined SOIC
and SNAPHAT assembly can sustain shock levels
in excess of 100 g without separating. This package also passes variable frequency testing in accordance with MIL-STD-883, method 2007.2,
condition A.
Figure 2 illustrates the affect of repeated insertion
and extraction of the SNAPHA T top to the SOIC.
The force required to extract the SNAPHAT, and
then to re-insert it, reduces each time. After three
or four extractions, though, the reduction starts to
become unnoticeable, and the force required
remains at a fairly constant figure. Typically,
though, the SNAPHAT will only need to be
extracted and re-inserted once in its lifetime.
BATTERY CHARACTERISTICS
Figure 3 illust rates the lithi um coin cell disc harge
rate for a given load. This demonstrates the char-
Table 1. Description
Parameter Value
Operating
Temperature
Storage
Temperature
Nominal Crystal
Frequency
Load Capacitance 12.5 pF
Nominal
Battery Voltage
Nominal
Battery Capacity
Battery Chemistry Li(CF)x
1 = 0 to 70 °C
6 = –40 to 85 °C
–40 to 85 °C
32.768 kHz
2.8 V
48 mAh M4T28
120 mAh M4T32
acteristically flat voltage level supplied by t he ba ttery until very near the end of its life. These
discharge levels have been great ly acc ele rated in
comparison to the normal, actual usage.
UL RECOGNITION
The M4Txx-BR12SH has been recognized by Underwriters Laboratories under their Component
Recognition Program and carries U.L. File Number E89556.
Figure 2. SNAPHAT Insertion/Extraction Forces
20
7.5
Force (pounds)
2/7
5
12.5
10
7.5
5
2.5
0
123
Average Insertion Force
Average Extraction Force
45
Number of Extractions
6
7
98
10
AI02526
Figure 3. Batt ery D is cha rge Rates
LOAD CHARACTERISTICS Temp: 20˚C
3.5
3.0
2.5
M4TXX-BR12SH
2.0
Voltage (V)
1.5
1.0
0
LOAD CHARACTERISTICS Temp: 20˚C
3.5
3.0
2.5
2.0
Voltage (V)
1.5
1.0
0
15kΩ 30kΩ
200 400 600 1200 1600 1800
15kΩ 30kΩ 50kΩ 100kΩ
1000 2000 3000 4000 5000 6000
800 1000 1400 2000
Duration (hrs.)
(A)
Duration (hrs.)
(B)
100kΩ
AI02519
BATTER Y LI FE
For information on Data Retention Life and Battery
Storage Life, please refer to the Application Note
AN1012.
GENERAL NOTES
To remove the SNAPHAT top for replacement, a
DIP/IC extractor tool should be used.
Caution: To avoid draining battery do NOT place
SNAPHAT pins in a conductive foam.
Caution: To avoid damaging SNAPHAT s ockets
do NOT wave solder SOIC.
For battery disposal information, see on the web at
www.rayovac.com.
Figure 4. DIP Extractor Tool
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