M4T28-BR12SH
M4T32-BR12SH
Real-time clock and TIMEKEEPER® SNAPHAT®
battery with crystal
Datasheet - production data
Description
The M4Txx-BR12SH SNAPHAT® top is a
detachable lithium power source for ST’s serial
real-time clock and non-volatile TIMEKEEPER®
surface-mount SOIC 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.
SNAPHAT® battery with crystal
Features
Provides battery backup power for serial realtime clock, 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 = 48 mAh
– M4T32-BR12SH = 120 mAh
Keyed insertion to ensure proper assembly
Removable for replacement and proper
disposal
Pb-free package
Available in Ecopack® packages, tubes
February 2014
This is information on a product in full production.
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www.st.com
Contents
M4T28-BR12SH, M4T32-BR12SH
Contents
1
Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1
Battery characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2
UL recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3
Battery life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4
General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7
Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package mechanical data . 11
SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal,
package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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List of figures
M4T28-BR12SH, M4T32-BR12SH
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
4/16
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SNAPHAT® insertion/extraction forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Battery discharge rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DIP extractor tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package outline. . . . . . . . . 11
SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package outline. . . . . . . . 12
Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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1
Device overview
Device overview
Figure 1. Logic diagram
X1
X2
SNAPHAT
VBAT–
VBAT+
AI02528
Table 1. Signal names
X1
Crystal input
X2
Crystal output
VBAT–
Negative voltage
VBAT+
Positive voltage
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Maximum ratings
2
M4T28-BR12SH, M4T32-BR12SH
Maximum ratings
Stressing the device above the rating listed in the absolute maximum ratings table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Table 2. Absolute maximum ratings
Symbol
TA
TSTG
Parameter
Ambient operating temperature
Grade 1
Grade
6(1)
Storage temperature (VCC off, oscillator off)
1. Only the M4T32-BR12SH is available in industrial temperature (grade 6).
Caution:
6/16
Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
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Value
Unit
0 to 70
°C
–40 to 85
°C
–40 to 85
°C
M4T28-BR12SH, M4T32-BR12SH
3
DC and AC parameters
DC and AC parameters
This section summarizes the operating and measurement conditions, as well as the DC and
AC characteristics of the device. The parameters in the following DC and AC characteristic
tables are derived from tests performed under the measurement conditions listed in the
relevant tables. Designers should check that the operating conditions in their projects match
the measurement conditions when using the quoted parameters.
Table 3. Operating and AC measurement conditions
Parameter
Nominal battery voltage (VCC)
Nominal battery capacity
M4T28-BR12SH
M4T32-BR12SH
Unit
2.8
2.8
V
mAh
48
120
Li(CF)
Li(CF)
12.5
12.5
pF
Nominal crystal frequency
32.768
32.768
kHz
Crystal accuracy (at 25°C)
± 35
± 35
ppm
Battery chemistry
Crystal load capacitance (CL)
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Mechanical information
4
M4T28-BR12SH, M4T32-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 ensuring 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 SNAPHAT top to the
SOIC. The force required to extract the SNAPHAT, and then to re-insert it, reduces each
time. After four or five extractions, 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.
Figure 2. SNAPHAT® insertion/extraction forces
15
12.5
Average Insertion
Average Extraction
Force (pounds)
10
7.5
5
2.5
0
1
2
3
4
5
6
7
8
9
10
Number of Extractions
AI02526
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4.1
Mechanical information
Battery characteristics
Figure 3 on page 10 illustrates the lithium coin cell discharge rate for a given load. This
demonstrates the characteristically flat voltage level supplied by the battery until very near
the end of its life. These discharge levels have been greatly accelerated in comparison to
the normal, actual usage.
Note:
These batteries contain no mercury (Hg), cadmium (Cd), or lead (Pb).
4.2
UL recognition
The M4Txx-BR12SH has been recognized by Underwriters Laboratories under their
Component Recognition Program and carries U.L. File Number E89556.
4.3
Battery life
For information on data retention life and battery storage life, please refer to the application
note AN1012.
4.4
General notes
ST has conducted experiments using a manual press which determined that if
approximately 60 pounds of force is applied to the top of the SNAPHAT®, battery damage
and/or die cracks could be induced. As Figure 2 on page 8 specifies, only an average of
less than 13 force-pounds is required for proper insertion. We recommend that no more
than 40 pounds of force be applied during SNAPHAT insertion.
If a manual press in employed, it is very important that it be calibrated such that it cannot
exceed this limit.
To remove the SNAPHAT top for replacement, a DIP/IC extractor tool should be used (see
Figure 4). The SNAPHAP top should be grabbed by the narrow end to avoid bending the
pins.
Caution:
To avoid draining battery do NOT place SNAPHAT pins into conductive foam.
Caution:
To avoid damaging SNAPHAT sockets do NOT wave solder SOIC.
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Mechanical information
M4T28-BR12SH, M4T32-BR12SH
Figure 3. Battery discharge rates
LOAD CHARACTERISTICS
3.5
Temp: 20˚C
Voltage (V)
3.0
2.5
BR1225
2.0
15kΩ
100kΩ
30kΩ
1.5
1.0
0
200 400 600 800 1000 1200 1400 1600 1800 2000
Duration (hrs.)
(A)
LOAD CHARACTERISTICS
3.5
Temp: 20˚C
Voltage (V)
3.0
2.5
BR1632
2.0
15kΩ
30kΩ
50kΩ
100kΩ
1.5
1.0
0
1000
2000
3000
4000
5000
Duration (hrs.)
(B)
6000
AI02519
Figure 4. DIP extractor tool
AI02527
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5
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 5. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package outline
1011860_J
Note:
Drawing is not to scale.
Table 4. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package mechanical data
Symbol
mm
Typ
Min
A
inches
Max
Typ
Min
9.779
Max
0.385
A1
7.239
7.747
0.285
0.305
A2
6.477
6.985
0.255
0.275
A3
0.000
0.381
0.000
0.015
B
0.457
0.559
0.018
0.022
D
21.082
21.844
0.830
0.860
E
14.224
14.986
0.560
0.590
eA
15.545
15.951
0.612
0.628
eB
3.200
3.607
0.126
0.142
L
2.032
2.286
0.080
0.090
T
6°
8°
6°
8°
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Package mechanical data
M4T28-BR12SH, M4T32-BR12SH
Figure 6. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package outline
7027195_H
Note:
Drawing is not to scale.
Table 5. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package mechanical data
Symb
mm
Typ
Min
A
12/16
inches
Max
Typ
Min
Max
10.541
N/A
0.415
A1
8.001
8.509
0.315
0.335
A2
7.239
7.747
0.285
0.305
A3
0.000
0.381
0.000
0.015
B
0.457
0.559
0.018
0.022
D
21.082
21.844
0.830
0.860
E
17.272
18.034
0.680
0.710
eA
15.545
15.951
0.612
0.628
eB
3.200
3.607
0.126
0.142
L
2.032
2.286
0.080
0.090
T
6°
8°
6°
8°
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6
Part numbering
Part numbering
Table 6. Ordering information scheme
Example:
M4T
28-BR12
SH
1
Device type
M4T
Battery voltage and capacity
28-BR12 = BR1225, 3 V, 48 mAh
32-BR12 = BR1632, 3 V, 120 mAh
Package
SH = SNAPHAT®
Temperature range
1 = 0 to 70°C
6 = –40 to 85°C (M4T32-BR12SH only)
Shipping method
blank = Ecopack® package, tubes
For a list of available options (e.g., speed, package) or for further information on any aspect
of this device, please contact the ST sales office nearest to you.
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Environmental information
7
M4T28-BR12SH, M4T32-BR12SH
Environmental information
Figure 7. Recycling symbols
This product contains a non-rechargeable lithium (lithium carbon monofluoride chemistry)
button cell battery fully encapsulated in the final product.
Recycle or dispose of batteries in accordance with the battery manufacturer's instructions
and local/national disposal and recycling regulations.
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8
Revision history
Revision history
Table 7. Document revision history
Date
Revision
Nov-1999
1
Changes
First issue
01-Mar-2001
2
04-Jun-2001
2.1
Basic textual changes from reformatting activity
10-Jul-2001
2.2
Changes references to “supervisor” from “controller;” clarify temperature
characteristics
21-Jan-2002
2.3
Change to include crystal accuracy (Table 3); add text for SNAPHAT®
insertion force tolerance and battery characteristics note
20-Aug-2002
2.4
Updated insertion/extraction data (Figure 2)
14-Mar-2003
2.5
Add pb-free note on page 1
20-Nov-2008
3
Reformatted document; updated cover page, Section 5: Package
mechanical data, Table 6; added Section 7: Environmental information.
4
Updated title, package representation on page 1, Features, Description,
Section 5: Package mechanical data and Section 7: Environmental
information
Removed tape and reel shipping option from Features and Table 6:
Ordering information scheme
20-Feb-2014
Reformatted
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M4T28-BR12SH, M4T32-BR12SH
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