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september 2006 rev 4 1/19 1 m41t56c64 serial real time clock with 56 bytes of nvram + 64 kbit (8192 bit x 8) eeprom feature summary 5v 10% supply voltage i 2 c bus compatible operating temperature of ?40 to 85c packaging includes: ? 18-lead soic (with embedded crystal) rohs compliant serial rtc features counters for seconds, minutes, hours, day, date, month, years, and century embedded crystal package software clock calibration automatic power-fail detect and switch circuitry 56 bytes of general purpose sram ultra-low battery supply current of 450na automatic leap year compensation special software programmable output two-wire i 2 c serial interface supports 100khz protocol serial eeprom features 8192 bytes of general purpose eeprom (more than 1e6 erase/write cycles) two-wire i 2 c serial interface supports 400khz protocol byte and page write (up to 32 bytes) more than 40 year data retention self-timed programming cycle 1 18 embedded crystal sox18(my) 18-pin (300mil) soic www.st.com
contents m41t56c64 2/19 contents 1 summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.1 serial rtc device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.2 eeprom device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
m41t56c64 list of tables 3/19 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 2. device select code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 4. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 5. capacitance and input parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 table 6. dc characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 7. ac characteristics, (serial rtc, m41t56) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 8. ac characteristics (serial eeprom, m24c64) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 9. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal, package mech. . . . . . 16 table 10. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 11. revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
list of figures m41t56c64 4/19 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. 18-pin soic connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 4. crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 5. ac measurement i/o waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 figure 6. ac bus timing requirements sequence (serial rtc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 7. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal . . . . . . . . . . . . . . . . . . 16
m41t56c64 summary description 5/19 1 summary description the m41t56c64 is a low power, serial real time clock with 56 bytes of nvram plus a 64kb eeprom (see figure 3 ). a built-in 32,768hz oscillator (c rystal controlled) and the first 8 bytes of the ram are used for the clock/calendar function and are configured in binary coded decimal (bcd) format. addresses and data are transferred serially via a two-line, bi- directional bus. the built-in address register is incremented automatically after each write or read data byte. the m41t56c64 clock has a built-in power sens e circuit which detects power failures and automatically switches to the battery supply during power failures. the energy needed to sustain the ram and clock operations can be supplied from a small lithium coin cell. typical data retention time for the serial rtc is in excess of 10 years with a 50mah, 3v lithium cell. the m41t56c64 is supplied in an 18-lead plastic soic package. 1.1 calibration as the crystal is molded toge ther with the silicon in this package, st can program the appropriate calibration value necessary to achieve 5 ppm accuracy at 25c after two smt reflows (see figure 4 ). this calibration value will be written into address 1550h of the eeprom. this clock accuracy can then be guar anteed to drift no mo re than 3 ppm the first year, and 1 ppm for each following year due to crystal aging. figure 1. logic diagram 1. open drain output ai09123 v cc m41t56 + m24c64 (eeprom) v ss scl e 0 e 1 e 2 wc sda ft/out (1) v bat
pin settings m41t56c64 6/19 2 pin settings 2.1 pin description 2.2 pin connections figure 2. 18-pin soic connection 1. no connect (nc) pins should be tied to v ss 2. no function (nf) pins should be tied to v ss. pins 2 and 3, and pins 16 and 17 are internally shorted together. 3. open drain output table 1. signal names ft/out (1) 1. open drain output frequency test / output driver (open drain) sda serial data address input / output scl serial clock wc write control e0, e1, e2 chip enables v bat battery supply voltage v cc supply voltage v ss ground nc (2) 2. no connect (nc) pins should be tied to v ss . no connect nf (3) 3. no function (nf) pins should be tied to v ss . pins 2 and 3, and pins 16 and 17 are internally shorted together. no function ai09124 8 2 3 4 5 6 7 9 12 11 10 18 17 16 15 14 13 1 wc e1 nf (2) nf (2) nc (1) nf (2) nf (2) nc (1) v ss v bat v cc e0 nc (1) e2 sda scl nc (1) ft/out (3) m41t56 + m24c64 (eeprom)
m41t56c64 application 7/19 3 application figure 3. block diagram figure 4. crystal accuracy across temperature ai09125 seconds oscillator 32.768 khz voltage sense and switch circuitry serial bus interface divider control logic address register m24c64 8192 x8 (eeprom) minutes century/hours day date month year control 56 x8 (sram) ft/out v cc v ss v bat e 0 e 1 e 2 scl sda 1 hz ai09159 ?160 0 10203040506070 frequency (ppm) temperature c 80 ?10 ?20 ?30 ?40 ?100 ?120 ?140 ?40 ?60 ?80 20 0 ?20 k = ?0.034 ppm/ c 2 0.004 ppm/ c 2 ? f = offset + k x (t ? 25) 2 f offset = 6 ppm 6 ppm
application m41t56c64 8/19 table 2. device select code device type identifier (1) 1. the most significant bit, b7, is sent first. chip enable address (2) 2. e0, e1, and e2 are compared against the respec tive external pins on the memory device. rw b7 b6 b5 b4 b3 b2 b1 b0 m24c64 1 0 1 0 e2 e1 e0 rw m41t561101000 rw
m41t56c64 operation 9/19 4 operation 4.1 serial rtc device the m41t56c64 contains one serial rtc (m41t56). for detailed information on how to use the devices, see the m41t56 datasheet, which is available from your local stmicroelectronics distributor or from the stmicroelectronics website, http://www.st.com/rtc/ . 4.2 eeprom device the m41t56c64 contains a 64 kbit serial eeprom (m24c64). for detailed information on how to use the devices, see the m24c64 datasheet, which is available from your local stmicroelectronics distributor or from the stmicroelectronics website, http://www.st.com/eeprom/.
maximum rating m41t56c64 10/19 5 maximum rating 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 imp lied. exposure to absolute ma ximum rating conditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality documents. caution: negative undershoots below ?0.3v are not allowed on any pin while in the battery back-up mode. table 3. absolute maximum ratings symbol parameter value unit t a ambient operating temperature ?40 to 85 c t stg storage temperature (v cc off, oscillator off) ?55 to 125 c t sld (1) 1. for sox18 package, lead-free (pb-free) lead finish: reflow at peak te mperature of 240c (total thermal budget not to exceed 180c for between 90 to 150 seconds). no direct exposure to infrared (ir) reflow, or ir preheat allowed, to avoid damaging the embedded 32khz crystal. lead solder temperature for 10 seconds 240 c v io input or output voltages ?0.3 to 6.5 v v cc supply voltage ?0.3 to 6.5 v i o output current 20 ma p d power dissipation 0.25 w
m41t56c64 dc and ac parameters 11/19 6 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. figure 5. ac measurement i/o waveform table 4. operating and ac measurement conditions (1) 1. output hi-z is defined as the point where data is no longer driven. parameter value unit supply voltage (v cc ) 4.5 to 5.5 v ambient operating temperature (t a ) ?40 to 85 c load capacitance (c l ) 100 pf input rise and fall times 50 (max) ns input pulse voltages 0.2v cc to 0.8v cc v input and output timing ref. voltages 0.3v cc to 0.7v cc v ai02568 0.8v cc 0.2v cc 0.7v cc 0.3v cc
dc and ac parameters m41t56c64 12/19 table 5. capacitance and input parameters symbol parameter (1) (2) 1. effective capacitance measur ed with power supply at 5v; sampled, not 100% tested. 2. at 25c, f = 400khz.. test condition min max unit c in input capacitance (scl) 13 pf input capacitance (sda) 18 pf input capacitance (other pins) 6 pf z wcl wc input impedance v in < 0.5v 5 20 k ? z wch wc input impedance v in < 0.7v cc 500 k ? c out (3) 3. outputs deselected. output capacitance (sda) 18 pf output capacitance (ft/out) 10 pf table 6. dc characteristics symbol parameter test condition (1) 1. valid for ambient operating temperature: t a = ?40 to 85c; v cc = 4.5 to 5.5v (except where noted). min typ max unit i li input leakage current 0v v in v cc 3 a i lo output leakage current 0v v out v cc 3 a i cc1 supply current (serial rtc active) switch frequency = 100khz 310 a supply current (serial eeprom active) v cc = 5v, f c =400khz (rise/fall time < 30ns) 2.2 ma i cc2 supply current (standby) scl, sda = v cc ? 0.3v 100 a v il input low voltage (scl, sda) ?0.3 1.5 v input low voltage (e2, e1, e0) ?0.45 0.3v cc v input low voltage (wc ) ?0.45 0.5 v v ih input high voltage (scl, sda) 3 v cc + 0.8 v input high voltage (e2, e1, e1, wc ) 0.7v cc v cc + 1 v v ol output low voltage i ol = 3ma, v cc = 5v 0.4 v v bat (2) 2. stmicroelectronics recommends the rayovac br1225 or br1632 (or equivalent) as the battery supply. battery supply voltage 2.5 3 3.5 v i bat battery supply current t a = 25c, v cc = 0v, oscillator on, v bat = 3v 450 550 na
m41t56c64 dc and ac parameters 13/19 figure 6. ac bus timing requirements sequence (serial rtc) table 7. ac characteristics, (serial rtc, m41t56) symbol parameter (1) 1. valid for ambient operating temperature: t a = ?40 to 85c; vcc = 4.5 to 5.5v (except where noted). min max unit f scl scl clock frequency 0 100 khz t low clock low period 4.7 s t high clock high period 4 s t r sda and scl rise time 1 s t f sda and scl fall time 300 ns t hd:sta start condition hold time (after this period the first clock pulse is generated) 4s t su:sta start condition setup time (only relevant for a repeated start condition) 4.7 s t su:dat data setup time 250 ns t hd:dat (2) 2. transmitter must internally provi de a hold time to bridge the undefined region (300ns max.) of the falling edge of scl. data hold time 0 s t su:sto stop condition setup time 4.7 s t buf time the bus must be free before a new transmission can start 4.7 s t lp low-pass filter input time constant (sda and scl) for serial rtc 0.25 1 s ai00589 sda p tsu:sto tsu:sta thd:sta sr scl tsu:dat tf thd:dat tr thigh tlow thd:sta tbuf s p
dc and ac parameters m41t56c64 14/19 table 8. ac characterist ics (serial eeprom, m24c64) symbol alt. parameter test condition min. max. unit f c f scl clock frequency 400 khz t chcl t high clock pulse width high 600 ns t clch t low clock pulse width low 1300 ns t dl1dl2 (1) 1. sampled only, not 100% tested. t f sda fall time 20 300 ns t dxcx t su:dat data in set up time 100 ns t cldx t hd:dat data in hold time 0 ns t clqx t dh data out hold time 200 ns t clqv (2) 2. to avoid spurious start and stop conditions, a minimum delay is placed between scl=1 and the falling or rising edge of sda. t aa clock low to next data valid (access time) 200 900 ns t chdx (3) 3. for a restart condition, or following a write cycle. t su:sta start condition set up time 600 ns t dlcl t hd:sta start condition hold time 600 ns t chdh t su:sto stop condition set up time 600 ns t dhdl t buf time between stop condition and next start condition 1300 ns t w t wr write time 5 ms t ns pulse width ignored (input filter on scl and sda for serial eeprom) single glitch 100 ns
m41t56c64 package mechanical data 15/19 7 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
package mechanical data m41t56c64 16/19 figure 7. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal 1. drawing is not to scale. table 9. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal, package mech. symbol millimetres inches typ min max typ min max a 2.44 2.69 0.096 0.106 a1 0.15 0.31 0.096 0.012 a2 2.29 2.39 0.090 0.094 b 0.41 0.51 0.016 0.020 c 0.20 0.31 0.008 0.012 d 11.61 11.56 11.66 0.457 0.455 0.459 ddd 0.10 0.004 e 7.57 7.67 0.298 0.302 e 1.27 ? ? 0.050 ? ? h 10.16 10.52 0.400 0.414 l 0.51 0.81 0.020 0.032 a08 08 n18 18 e 9 e d c h 10 18 1 b so-j a1 l a1 h x 45 a a2 ddd
m41t56c64 order codes 17/19 8 order codes for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. table 10. ordering information scheme example: m41t 56 c64 my 6 e device type m41t = serial rtc supply voltage and write protect voltage 56 = v cc = 4.5 to 5.5v eeprom density c64 = 64 kbit (8192 bit x 8) package my (1) = sox18 1. the sox18 package includes an embedded 32,768hz crystal. temperature range 6 = ?40c to 85c shipping method e = ecopack? package, tubes f = ecopack? package, tape & reel
revision history m41t56c64 18/19 9 revision history table 11. revision history date version description 14-sep-2004 1 first edition 25-mar-2005 2 clarify pin connections, maximum rating 4-sep-2006 3 datasheet status updated to full datasheet; changed title on page 1; small text changes to section 1: summary description ; reformatted figure in the feature summary , reformatted figure 1 , figure 2 , ta b l e 2 and ta bl e 9 ; ecopack compliant; updated disclaimer 22-sep-2006 4 added information on eeprom density table 10: ordering information scheme
m41t56c64 19/19 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2006 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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