M4T32-BR12SH6TR - STMicroelectronics, Inc.

November 2008 Rev 3 1/16

M4T28-BR12SH

M4T32-BR12SH

TIMEKEEPER® SNAPHAT® (battery and crystal)

Features

■Provides battery backup power for 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 or tape

& reel

SNAPHAT (SH)

battery/crystal

www.st.com

Contents M4T28-BR12SH, M4T32-BR12SH

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Contents

1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

M4T28-BR12SH, M4T32-BR12SH List of tables

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List of tables

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

List of figures M4T28-BR12SH, M4T32-BR12SH

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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

M4T28-BR12SH, M4T32-BR12SH Description

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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

the battery and crystal from being exposed to the high temperatures of the surface mount

process.

Figure 1. Logic diagram

Table 1. Signal names

X1 Crystal input

X2 Crystal output

VBAT– Negative voltage

VBAT+ Positive voltage

AI02528

SNAPHAT

VBAT– VBAT+

X1 X2

Maximum ratings M4T28-BR12SH, M4T32-BR12SH

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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. Absolute maximum ratings

Caution: Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.

Symbol Parameter Value Unit

TAAmbient operating temperature Grade 1 0 to 70 °C

Grade 6(1)

1. Only the M4T32-BR12SH is available in industrial temperature (grade 6).

–40 to 85 °C

TSTG Storage temperature (VCC off, oscillator off) –40 to 85 °C

M4T28-BR12SH, M4T32-BR12SH DC and AC parameters

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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 M4T28-BR12SH M4T32-BR12SH Unit

Nominal battery voltage (VCC)2.82.8V

Nominal battery capacity 48 120 mAh

Battery chemistry Li(CF) Li(CF)

Crystal load capacitance (CL) 12.5 12.5 pF

Nominal crystal frequency 32.768 32.768 kHz

Crystal accuracy (at 25°C) ± 35 ± 35 ppm

Mechanical information M4T28-BR12SH, M4T32-BR12SH

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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® 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. SNAPHAT® insertion/extraction forces

2.5

7.5

12.5

12345678910

Number of Extractions

Force (pounds)

Average Insertion

Average Extraction

AI02526

M4T28-BR12SH, M4T32-BR12SH Mechanical information

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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®, 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.

Mechanical information M4T28-BR12SH, M4T32-BR12SH

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Figure 3. Battery discharge rates

Figure 4. DIP extractor tool

AI02519

1.0

1.5

2.0

2.5

3.0

3.5

Voltage (V)

LOAD CHARACTERISTICS Temp: 20˚C

1000 2000 3000 4000 5000 6000

Duration (hrs.)

(B)

15kΩ30kΩ50kΩ100kΩ

1.0

1.5

2.0

2.5

3.0

3.5

Voltage (V)

LOAD CHARACTERISTICS Temp: 20˚C

200 400 600 1200 1600 1800

Duration (hrs.)

(A)

100kΩ

800 1000 1400 2000

15kΩ30kΩ

BR1225

BR1632

AI02527

M4T28-BR12SH, M4T32-BR12SH Package mechanical data

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5 Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK®

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® housing for 48 mAh battery & crystal, package

outline

Note: Drawing is not to scale.

Table 4. SH – 4-pin SNAPHAT® housing for 48 mAh battery & crystal, package

mechanical data

SHTK-A

A1 A

Symb

mm inches

Typ Min Max Typ Min Max

A 9.78 0.385

A1 6.73 7.24 0.265 0.285

A2 6.48 6.99 0.255 0.275

A3 0.38 0.015

B 0.46 0.56 0.018 0.022

D 21.21 21.84 0.835 0.860

E 14.22 14.99 0.560 0.590

eA 15.55 15.95 0.612 0.628

eB 3.20 3.61 0.126 0.142

L 2.03 2.29 0.080 0.090

Package mechanical data M4T28-BR12SH, M4T32-BR12SH

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Figure 6. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package

outline

Note: Drawing is not to scale.

Table 5. SH – 4-pin SNAPHAT® housing for 120 mAh battery & crystal, package

mechanical data

SHTK-A

A1 A

Symb

mm inches

Typ Min Max Typ Min Max

A 10.54 0.415

A1 8.00 8.51 0.315 0.335

A2 7.24 8.00 0.285 0.315

A3 0.38 0.015

B 0.46 0.56 0.018 0.022

D 21.21 21.84 0.835 0.860

E 17.27 18.03 0.680 0.710

eA 15.55 15.95 0.612 0.628

eB 3.20 3.61 0.126 0.142

L 2.03 2.29 0.080 0.090

M4T28-BR12SH, M4T32-BR12SH Part numbering

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6 Part numbering

Table 6. Ordering information scheme

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.

Example: 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®

Temperature range

1 = 0 to 70°C

6 = –40 to 85°C (M4T32-BR12SH only)

Shipping method

blank = Ecopack® package, tubes

TR = Ecopack® package, tape & reel

Environmental information M4T28-BR12SH, M4T32-BR12SH

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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".

M4T28-BR12SH, M4T32-BR12SH Revision history

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8 Revision history

Table 7. Document revision history

Date Revision Changes

Nov-1999 1 First issue

01-Mar-2001 2 Reformatted

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 (Tab le 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, Ta b le 6 ; added Section 7: Environmental information.

M4T28-BR12SH, M4T32-BR12SH

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