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1/14 preliminary data september 2004 this is preliminary information on a new product now in development or undergoing evaluation. details are subject to change wit hout notice. m41t56c64 512 bit (64 bit x8) serial access timekeeper ? sram + 64 kbit (8192 bit x8) eeprom features summary 5v 10% supply voltage i 2 c bus compatible operating temperature of ?40 to 85c packaging includes: ? 18-lead soic (with embedded crystal) 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 figure 1. package 1 18 sox18 (my) 18-pin (300mil) soic embedded crystal
m41t56c64 2/14 table of contents features summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 serial rtc features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 serial eeprom features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 figure 1. package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 summary description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 figure 2. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 figure 3. 18-pin soic connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 figure 4. crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 5. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 table 2. device select code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 serial rtc device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 eeprom device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 maximum rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 dc and ac parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 4. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 6. ac measurement i/o waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 5. capacitance and input parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 6. dc characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 7. bus timing requirements sequence (serial rtc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 7. ac characteristics, (serial rtc, m41t56) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 8. ac waveforms (serial eeprom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 8. ac characteristics (serial eeprom, m24c64) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 9. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal, package outline. 11 table 9. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal, package mech. . 11 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 10. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 11. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3/14 m41t56c64 summary description the m41t56c64 timekeeper ? is a low power, 512- bit static cmos ram organized as 64 words by 8 bits plus a 64kb eeprom. a built-in 32,768 hz oscillator (crystal controlled) and the first 8 bytes of the ram are used for the clock/calendar function and are configured in binary coded deci- mal (bcd) format. addresses and data are trans- ferred serially via a two-line, bi-directional bus. the built-in address register is incremented auto- matically after each write or read data byte. the m41t56c64 clock has a built-in power sense circuit which detects power failures and automati- cally 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. calibration as the crystal is molded together with the silicon in this package, st can program the appropriate cal- ibration value necessary to achieve 6 ppm accu- racy at 25c after two reflows (see figure 4., page 4 ). this calibration value will be written into address 1550h of the eeprom. this clock accuracy can then be guaranteed to drift no more than 4 ppm the first year, and 2 ppm for each following year due to crystal aging. figure 2. logic diagram note: 1. open drain output table 1. signal names figure 3. 18-pin soic connections note: 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 ft/out 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 ai09124 8 2 3 4 5 6 7 9 12 11 10 18 17 16 15 14 13 1 wc e1 nc nc nc nc nc nc v ss v bat v cc e0 nc e2 sda scl nc ft/out (1) m41t56 + m24c64 (eeprom)
m41t56c64 4/14 figure 4. crystal accuracy across temperature figure 5. block diagram 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 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
5/14 m41t56c64 table 2. device select code note: 1. the most significant bit, b7, is sent first. 2. e0, e1, and e2 are compared against the respective external pins on the memory device. operation 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 dis- tributor or from the stmicroelectronics website, ht- tp://www.st.com/rtc/. eeprom device the m41t56c64 contains a 64 kbit serial ee- prom (m24c64). for detailed information on how to use the devices, see the m24c64 datasheet, which is available from your local stmicroelec- tronics distributor or from the stmicroelectronics website, http://www.st.com/eeprom/. 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 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 3. absolute maximum ratings note: 1. for sox18 package, lead-free (pb-free) lead finish: reflow at peak temperature of 240c (total thermal budget not to exc eed 180c for between 90 to 150 seconds). caution: negative undershoots below ?0.3v are not allowed on any pin while in the battery back-up mode. device type identifier (1) chip enable address (2) rw m24c64 b7 b6 b5 b4 b3 b2 b1 b0 1010e2e1e0 rw m41t56 1101000 rw 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) 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 6/14 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 4. operating and ac measurement conditions note: output hi-z is defined as the point where data is no longer driven. figure 6. ac measurement i/o waveform table 5. capacitance and input parameters note: 1. effective capacitance measured with power supply at 5v; sampled, not 100% tested. 2. at 25c, f = 400khz. 3. outputs deselected. 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 symbol parameter (1,2) 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 520k ? z wch wc input impedance v in < 0.7v cc 500 k ? c out (3) output capacitance (sda) 18 pf output capacitance (ft/out) 10 pf
7/14 m41t56c64 table 6. dc characteristics note: 1. valid for ambient operating temperature: t a = ?40 to 85c; v cc = 4.5 to 5.5v (except where noted). 2. stmicroelectronics recommends the rayovac br1225 or br1632 (or equivalent) as the battery supply. symbol parameter test condition (1) 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) 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 8/14 figure 7. bus timing requirements sequence (serial rtc) table 7. ac characteristics, (serial rtc, m41t56) note: 1. valid for ambient operating temperature: t a = ?40 to 85c; v cc = 4.5 to 5.5v (except where noted). 2. transmitter must internally provide a hold time to bridge the undefined region (300ns max.) of the falling edge of scl. symbol parameter (1) 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) 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
9/14 m41t56c64 figure 8. ac waveforms (serial eeprom) scl sda in scl sda out scl sda in tchcl tdlcl tchdx start condition tclch tdxcx tcldx sda input sda change tchdh tdhdl stop condition data valid tclqv tclqx tchdh stop condition tchdx start condition write cycle tw ai00795c start condition
m41t56c64 10/14 table 8. ac characteristics (serial eeprom, m24c64) note: 1. for a restart condition, or following a write cycle. 2. sampled only, not 100% tested. 3. to avoid spurious start and stop conditions, a minimum delay is placed between scl=1 and the falling or rising edge of sda. 4. the write time of 5 ms only applies to devices bearing the process letter ?b? in the package marking (on the top side of the p ack- age), otherwise (for devices bearing the process letter ?n?) the write time is 10 ms. for further details, please contact your nearest st sales office, and ask for a copy of the product change notice pcee0036. 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 (2) 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 (3) t aa clock low to next data valid (access time) 200 900 ns t chdx (1) 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 or (4) 10 ms t ns pulse width ignored (input filter on scl and sda for serial eeprom) single glitch 100 ns
11/14 m41t56c64 package mechanical figure 9. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal, package outline note: drawing is not to scale. table 9. sox18 ? 18-lead plastic small outline, 300mils, embedded crystal, package mech. symbol millimeters inches typ min max typ min max a 2.44 2.69 0.096 0.106 a1 0.15 0.31 0.006 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 e1.27? ?0.050? ? h 10.16 10.52 0.400 0.414 l 0.51 0.81 0.020 0.032 0 8 0 8 n 18 18 e 9 e d c h 10 18 1 b so-j a1 l a1 h x 45 a a2 ddd
m41t56c64 12/14 part numbering table 10. ordering information scheme note: 1. the sox18 package includes an embedded 32,768hz crystal. for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: m41t 56c64 my 6 tr device type m41t supply voltage and write protect voltage 56c64 = v cc = 4.5 to 5.5v package my (1) = sox18 temperature range 6 = ?40c to 85c shipping method blank = tubes tr = tape & reel
13/14 m41t56c64 revision history table 11. document revision history date version description 14-sep-04 1.0 first edition
m41t56c64 14/14 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences 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 publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2004 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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