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M4T28-BR12SH M4T32-BR12SH
TIMEKEEPER(R) SNAPHAT(R) (battery and crystal)
Features
Provides battery backup power for non-volatile TIMEKEEPER(R) and supervisor devices in the 28- or 44-pin SNAPHAT(R) 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(R) packages, tubes or tape & reel
SNAPHAT (SH) battery/crystal

November 2008
Rev 3
1/16
www.st.com 1
Contents
M4T28-BR12SH, M4T32-BR12SH
Contents
1 2 3 4 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1 4.2 4.3 4.4 Battery characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 UL recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Battery life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 6 7 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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M4T28-BR12SH, M4T32-BR12SH
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(R) housing for 48 mAh battery & crystal, package mechanical data 11 SH - 4-pin SNAPHAT(R) 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. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SNAPHAT(R) insertion/extraction forces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Battery discharge rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 DIP extractor tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SH - 4-pin SNAPHAT(R) housing for 48 mAh battery & crystal, package outline . . . . . . . . 11 SH - 4-pin SNAPHAT(R) housing for 120 mAh battery & crystal, package outline . . . . . . . 12 Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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M4T28-BR12SH, M4T32-BR12SH
Description
1
Description
The M4TXX-BR12SH SNAPHAT(R) top is a detachable lithium power source for ST's nonvolatile TIMEKEEPER(R) 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. Figure 1. Logic diagram
X1
X2
SNAPHAT
VBAT-
VBAT+
AI02528
Table 1.
X1 X2 VBAT- VBAT+
Signal names
Crystal input Crystal output Negative voltage Positive voltage
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Maximum ratings
M4T28-BR12SH, M4T32-BR12SH
2
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. Refer also to the STMicroelectronics SURE program and other relevant quality documents. Table 2.
Symbol TA TSTG
Absolute maximum ratings
Parameter Ambient operating temperature Grade 1 Grade 6(1) Value 0 to 70 -40 to 85 -40 to 85 Unit C C C
Storage temperature (VCC off, oscillator off)
1. Only the M4T32-BR12SH is available in industrial temperature (grade 6).
Caution:
Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
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M4T28-BR12SH, M4T32-BR12SH
DC and AC parameters
3
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 Battery chemistry Crystal load capacitance (CL) Nominal crystal frequency Crystal accuracy (at 25C) M4T28-BR12SH 2.8 48 Li(CF) 12.5 32.768 35 M4T32-BR12SH 2.8 120 Li(CF) 12.5 32.768 35 pF kHz ppm Unit V mAh
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Mechanical information
M4T28-BR12SH, M4T32-BR12SH
4
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(R) 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 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.
15
SNAPHAT(R) insertion/extraction forces
12.5 Average Insertion Average Extraction 10 Force (pounds)
7.5
5
2.5
0 1 2 3 4 5 6 7 8 9 10
AI02526
Number of Extractions
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M4T28-BR12SH, M4T32-BR12SH
Mechanical information
4.1
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(R), 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: Caution:
To avoid draining battery do NOT place SNAPHAT pins into conductive foam. To avoid damaging SNAPHAT sockets do NOT wave solder SOIC.
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Mechanical information Figure 3. Battery discharge rates
M4T28-BR12SH, M4T32-BR12SH
3.5 3.0 Voltage (V) 2.5 2.0 1.5 1.0 0
LOAD CHARACTERISTICS
Temp: 20C
BR1225 15k 30k 100k
200 400 600 800 1000 1200 1400 1600 1800 2000 Duration (hrs.) (A)
3.5 3.0 Voltage (V) 2.5 2.0 1.5 1.0 0
LOAD CHARACTERISTICS
Temp: 20C
BR1632 15k 30k 50k 100k
1000
2000
3000
4000
5000
6000
Duration (hrs.) (B)
AI02519
Figure 4.
DIP extractor tool
AI02527
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M4T28-BR12SH, M4T32-BR12SH
Package mechanical data
5
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 5. SH - 4-pin SNAPHAT(R) housing for 48 mAh battery & crystal, package outline
A1
A2 A A3
eA D
B eB
L
E
SHTK-A
Note:
Drawing is not to scale. Table 4. SH - 4-pin SNAPHAT(R) housing for 48 mAh battery & crystal, package mechanical data
mm Symb Typ A A1 A2 A3 B D E eA eB L 0.46 21.21 14.22 15.55 3.20 2.03 6.73 6.48 Min Max 9.78 7.24 6.99 0.38 0.56 21.84 14.99 15.95 3.61 2.29 0.018 0.835 0.560 0.612 0.126 0.080 0.265 0.255 Typ Min Max 0.385 0.285 0.275 0.015 0.022 0.860 0.590 0.628 0.142 0.090 inches
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Package mechanical data Figure 6.
M4T28-BR12SH, M4T32-BR12SH
SH - 4-pin SNAPHAT(R) housing for 120 mAh battery & crystal, package outline
A1
A2 A A3
eA D
B eB
L
E
SHTK-A
Note:
Drawing is not to scale. Table 5. SH - 4-pin SNAPHAT(R) housing for 120 mAh battery & crystal, package mechanical data
mm Symb Typ A A1 A2 A3 B D E eA eB L 0.46 21.21 17.27 15.55 3.20 2.03 8.00 7.24 Min Max 10.54 8.51 8.00 0.38 0.56 21.84 18.03 15.95 3.61 2.29 0.018 0.835 0.680 0.612 0.126 0.080 0.315 0.285 Typ Min Max 0.415 0.335 0.315 0.015 0.022 0.860 0.710 0.628 0.142 0.090 inches
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M4T28-BR12SH, M4T32-BR12SH
Part numbering
6
Part numbering
Table 6.
Example:
Ordering information scheme
M4T 28-BR12 SH 1 TR
Device type M4T
Battery voltage and capacity 28-BR12 = BR1225, 3 V, 48 mAh 32-BR12 = BR1632, 3 V, 120 mAh
Package SH = SNAPHAT(R)
Temperature range 1 = 0 to 70C 6 = -40 to 85C (M4T32-BR12SH only)
Shipping method blank = Ecopack(R) package, tubes TR = Ecopack(R) package, tape & reel
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
M4T28-BR12SH, M4T32-BR12SH
7
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. Please refer to the following web site address for additional information regarding compliance statements and waste recycling. Go to www.st.com/nvram, then select "Lithium Battery Recycling" from "Related Topics".
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M4T28-BR12SH, M4T32-BR12SH
Revision history
8
Revision history
Table 7.
Date Nov-1999 01-Mar-2001 04-Jun-2001 10-Jul-2001 21-Jan-2002 20-Aug-2002 14-Mar-2003 20-Nov-2008
Document revision history
Revision 1 2 2.1 2.2 2.3 2.4 2.5 3 First issue Reformatted Basic textual changes from reformatting activity Changes references to "supervisor" from "controller;" clarify temperature characteristics Change to include crystal accuracy (Table 3); add text for SNAPHAT(R) insertion force tolerance and battery characteristics note Updated insertion/extraction data (Figure 2) Add pb-free note on page 1 Reformatted document; updated cover page, Section 5: Package mechanical data, Table 6; added Section 7: Environmental information. Changes
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M4T28-BR12SH, M4T32-BR12SH
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