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1/12 august 2002 m4t28-br12sh m4t32-br12sh timekeeper ? snaphat ? (battery & crystal) features summary n provides battery backup power for non-volatile timekeeper ? and supervisor devices in the 28- or 44- pin snaphat soic package n removable battery avoids heat associated with surface mount process n snaps directly onto surface- mounted snaphat soic n choice of battery capacities: C m4t28-br12sh = 48mah C m4t32-br12sh = 120mah n keyed insertion to insure proper assembly n removable for replacement and proper disposal n available in tubes or tape & reel figure 1. snaphat top package snaphat (sh) battery/crystal
m4t28-br12sh, m4t32-br12sh 2/12 table of contents summarydescription...........................................................3 logicdiagram(figure2.).........................................................3 signalnames(table1.)..........................................................3 maximumrating.................................................................4 absolutemaximumratings(table2.) ...............................................4 dc and ac parameters. . ........................................................4 operating and ac measurement conditions (table 3.) ..................................4 mechanical information .......................................................5 snaphatinsertion/extractionforces(figure3.) ......................................5 batterycharacteristics ...........................................................6 ulrecognition .................................................................6 batterylife ....................................................................6 general notes ..................................................................6 batterydischargerates(figure4.) .................................................7 dipextractortool(figure5.)......................................................7 partnumbering ................................................................8 package mechanical information . . . ...........................................9 revisionhistory...............................................................11
3/12 m4t28-br12sh, m4t32-br12sh summary description the m4txx-br12sh snaphat ? top is a detach- able lithium power source for sts non-volatile timekeeper ? surface-mount soic (mh) pack- age (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 tem- peratures of the surface mount process. figure 2. logic diagram table 1. signal names ai02528 snaphat v batC v bat+ x1 x2 x1 crystal input x2 crystal output v batC negative voltage v bat+ positive voltage
m4t28-br12sh, m4t32-br12sh 4/12 maximum rating stressingthedeviceabovetheratinglistedinthe 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 indicat- ed in the operating sections of this specification is not implied. exposure to absolute maximum rat- ing conditions for extended periods may affect de- vice reliability. refer also to the stmicroelectronics sure program and other rel- evant quality documents. table 2. absolute maximum ratings note: 1. only the m4t32-br12sh is available in industrial temperature (grade 6). caution: do not wave solder soic to avoid damaging snaphat sockets. dc and ac parameters this section summarizes the operating and mea- surement 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 measure- ment conditions listed in the relevant tables. de- signers should check that the operating conditions in their projects match the measurement condi- tions when using the quoted parameters. table 3. operating and ac measurement conditions symbol parameter value unit t a ambient operating temperature grade 1 0 to 70 c grade 6 (1) C40 to 85 c t stg storage temperature (v cc off, oscillator off) C40 to 85 c parameter m4t28-br12sh m4t32-br12sh unit nominal battery voltage (v cc ) 2.8 2.8 v nominal battery capacity 48 120 mah battery chemistry li(cf) li(cf) crystal load capacitance (c l ) 12.5 12.5 pf nominal crystal frequency 32.768 32.768 khz crystal accuracy (@ 25c) 35 35 ppm
5/12 m4t28-br12sh, m4t32-br12sh mechanical information electrical connection to the soic is made through four pins that connect to the four press fitted sock- ets 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 resis- tance. 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 pass- es variable frequency testing in accordance with mil-std-883, method 2007.2, condition a. figure 3 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 3. snaphat insertion/extraction forces 0 2.5 5 7.5 10 12.5 15 12345678910 number of extractions force (pounds) average insertion average extraction ai02526
m4t28-br12sh, m4t32-br12sh 6/12 battery characteristics figure 4, page 7 illustrates the lithium coin cell dis- charge 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). ul recognition the m4txx-br12sh has been recognized by un- derwriters laboratories under their component recognition program and carries u.l. file num- ber e89556. battery life for information on data retention life and battery storage life, please refer to the application note an1012. 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 3, page 5 specifies, only an average of less than 13 force-pounds is re- quired 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 5). 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. for battery disposal information, see on the web at www.rayovac.com .
7/12 m4t28-br12sh, m4t32-br12sh figure 4. battery discharge rates figure 5. dip extractor tool ai02519 0 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) 15k w 30k w 50k w 100k w 0 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) 100k w 800 1000 1400 2000 15k w 30k w br1225 br1632 ai02527
m4t28-br12sh, m4t32-br12sh 8/12 part numbering table 4. 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, 3v, 48mah 32-br12 = br1632, 3v, 120mah package sh = snaphat ? temperature range 1 = 0 to 70c 6 = C40 to 85c (m4t32-br12sh only) shipping method blank = tubes tr = tape & reel
9/12 m4t28-br12sh, m4t32-br12sh package mechanical information figure 6. sh C 4-pin snaphat housing for 48mah battery & crystal, package outline note: drawing is not to scale. table 5. sh C 4-pin snaphat housing for 48mah battery & crystal, package mechanical data 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 shtk-a a1 a d e ea eb a2 b l a3
m4t28-br12sh, m4t32-br12sh 10/12 figure 7. sh C 4-pin snaphat housing for 120mah battery & crystal, package outline note: drawing is not to scale. table 6. sh C 4-pin snaphat housing for 120mah battery & crystal, package mechanical data 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 shtk-a a1 a d e ea eb a2 b l a3
11/12 m4t28-br12sh, m4t32-br12sh revision history table 7. document revision history date rev. # revision details november 1999 1.0 first issue 03/01/01 2.0 reformatted 06/04/01 2.1 basic textual changes from reformatting activity 07/10/01 2.2 changes references to supervisor from controller; clarify temperature characteristics 01/21/02 2.3 change to include crystal accuracy (table 3); add text for snaphat insertion force tolerance and battery characteristics note 08/20/02 2.4 updated insertion/extraction data (figure 3)
m4t28-br12sh, m4t32-br12sh 12/12 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is registered trademark of stmicroelectronics all other names are the property of their respective owners. ? 2002 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. www.st.com

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