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product structure : silicon monolithic integrated circuit this product has no designed protection against radioactive rays . 1/ 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm c o., ltd. all rights reserved. 27.sep.2017 rev.001 tsz22111 ? 14 ? 001 www.rohm.com serial eeprom series standard eepro m i 2 c bus eeprom (2 - wire) br24g256 xxx - 5 series general description br24g 256-5 is a 256kbit serial eeprom of i 2 c bus interface . features ? all c ontrols a vailable by 2 p orts of s erial c lock ( scl) and s erial d ata ( sda ) ? 1.6v to 5.5v w ide l imit of o perating v ol tage, p ossible 1m hz o peration ? page write mode 64byte ? bit format 32 k x 8bit ? low current consumption ? p revention of miswriting ? wp ( write protect) function a dded ? p revention of miswriting at low voltage ? noise f ilter bu ilt in scl / sda pin ? initial d elivery s tate ff h key specification s ? write cycles : 4 m illion times (t a = 25c ) ? data retention : 200 y ears (t a =55 c ) ? write cycle time : 5ms ( max ) ? supply voltage : 1.6 v to 5.5v package s w(typ) x d(typ) x h(max) sop - j8 4.90mm x 6.00mm x 1.65mm tssop -b8 3 . 0 0mm x 6. 4 0mm x 1. 20m m msop 8 2 .90mm x 4 .00mm x 0 . 90m m applications o rdinary e lectronic e quipments (such as av equipment, oa equipment, telecommunication equipment, home electronic appliances, amusement eq uipment, etc.). typical application circuit fig ure 1 t ssop - b8 sop - j8 msop8 * * connect to vcc or gnd. there are pull - down elements inside the ic. if pin s are open, they are the same as when they are connected to gnd . v cc micro - controller figure 2. typical application circuit vcc wp sda a0 gnd scl a 1 a 2 0.1f datashee t
2 / 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm co., ltd. all rights reserved. 27.sep.2017 rev.001 www.rohm.com tsz22111 ? 15 ? 001 br24g256 xxx - 5 series contents general description ................................ ................................ ................................ ................................ ................................ ........ 1 features ................................ ................................ ................................ ................................ ................................ .......................... 1 key specifications ................................ ................................ ................................ ................................ ................................ ........... 1 packages ................................ ................................ ................................ ................................ ................................ ........................ 1 applications ................................ ................................ ................................ ................................ ................................ .................... 1 typical application circuit ................................ ................................ ................................ ................................ ............................... 1 contents ................................ ................................ ................................ ................................ ................................ ......................... 2 pin configuration ................................ ................................ ................................ ................................ ................................ ............ 3 pin description ................................ ................................ ................................ ................................ ................................ ................ 3 block diagram ................................ ................................ ................................ ................................ ................................ ................ 3 absolute maximum ratings ................................ ................................ ................................ ................................ ............................ 4 thermal resistance ................................ ................................ ................................ ................................ ................................ ........ 4 operating conditions ................................ ................................ ................................ ................................ ................................ ...... 5 input / output capacitance ................................ ................................ ................................ ................................ ............................. 5 input impedance ................................ ................................ ................................ ................................ ................................ ............. 5 memory cell characteristics ................................ ................................ ................................ ................................ ........................... 5 electrical characteristics ................................ ................................ ................................ ................................ ................................ . 5 ac characteristics ................................ ................................ ................................ ................................ ................................ .......... 6 ac characteristics condition ................................ ................................ ................................ ................................ .......................... 6 input / output timing ................................ ................................ ................................ ................................ ................................ ...... 7 typical performance curves ................................ ................................ ................................ ................................ ........................... 8 i 2 c bus communication ................................ ................................ ................................ ................................ ............................... 17 write command ................................ ................................ ................................ ................................ ................................ ............ 18 read command ................................ ................................ ................................ ................................ ................................ ............ 19 method of reset ................................ ................................ ................................ ................................ ................................ ........... 20 acknowledge polling ................................ ................................ ................................ ................................ ................................ ..... 20 wp valid timing (write cancel) ................................ ................................ ................................ ................................ .................... 21 command cancel by start condition and stop condition ................................ ................................ ................................ ............. 21 application examples ................................ ................................ ................................ ................................ ................................ ... 22 caution on power - up conditions ................................ ................................ ................................ ................................ .................. 24 low voltage malfunction prevention function ................................ ................................ ................................ .............................. 24 i/o equivalence circuits ................................ ................................ ................................ ................................ ................................ 25 operational notes ................................ ................................ ................................ ................................ ................................ ......... 26 ordering informati on ................................ ................................ ................................ ................................ ................................ ..... 27 lineup ................................ ................................ ................................ ................................ ................................ ........................... 27 marking diagrams ................................ ................................ ................................ ................................ ................................ ......... 28 physical dimension and packi ng information ................................ ................................ ................................ ............................... 29 revision history ................................ ................................ ................................ ................................ ................................ ............ 32 3 / 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm co., ltd. all rights reserved. 27.sep.2017 rev.001 www.rohm.com tsz22111 ? 15 ? 001 br24g256 xxx - 5 series pin con f iguration fig ure 3 . pin configuration pin descriptio n pin no. pin name input / output descriptio ns 1 a0 input slave address setting (note 1) 2 a1 input slave address setting (note 1) 3 a2 input slave address setting (note 1) 4 gnd - reference voltage of all input / output, 0v 5 sda input / output serial data input / serial data output (note 2 ) 6 sc l input serial clock input 7 wp input write protect pin (note 3 ) 8 v cc - c onnect the power source (note 1) connect to vcc or gnd. there are pull - down elements inside the ic . if pin s are open, they are the same as when they are connected to gnd . (note 2 ) sda is nmos op en drain, so it requires a pull - up resistor . (note 3) connect to vcc or gnd , or control to ' high ' level or ' low ' level . there are pull - down elements inside the ic. if this pin is open, this input is recognized as ' low ' . block diagra m fig ure 4 . block diagram (top view) vcc wp sda a0 a1 a2 gnd scl 7 8 6 5 3 4 2 1 8 7 6 5 4 3 2 1 sda scl wp v cc gnd a2 a1 a0 address decoder word address register data register control circuit high voltage generating circuit supply voltage detection 8bit ack start stop 15bit 256k bit eeprom a rray 4 / 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm co., ltd. all rights reserved. 27.sep.2017 rev.001 www.rohm.com tsz22111 ? 15 ? 001 br24g256 xxx - 5 series absolut e maximum ratings parameter symbol rating unit remark supply voltage v cc - 0.3 to + 6.5 v ta=25 c input voltage / output voltage \ maximum junction temperature t jmax 150 c storage temperature range t stg - 6 5 to +150 c caution 1 : operating the ic over the absolute maximum ratings may damage the ic. the damage can either be a short circuit between pins o r an open circuit between pins and the internal circuitry. therefore, it is imp ortant to consider circuit protection measures, such as adding a fuse, in case the ic is operated over the absolute maximum ratings. caution 2 : should by any chance the maximum junction temperature rating be exceeded the rise in temperature of the chip ma y result in deterioration of the properties of the chip. in case of exceeding this absolute maximum rating, design a pcb boards with thermal resistance taken into consideration by increasing board size and copper area so as not to exceed the maximum juncti on temperature rating. thermal resistance ( note 4 ) parameter symbol thermal resistance (typ) unit 1s ( note 6 ) 2s2p ( note 7 ) sop - j8 junction to ambient j a 149.3 76.9 c /w junction to top characterization parameter ( note 5 ) jt 18 11 c /w tssop - b8 ju nction to ambient j a 251.9 152.1 c /w junction to top characterization parameter ( note 5 ) jt 31 20 c /w msop8 junction to ambient j a 284.1 135.4 c /w junction to top characterization parameter ( note 5 ) jt 21 11 c /w (note 4 ) based on jesd 51 - 2a(sti ll - air) (note 5 ) the thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside surface of the component package. (note 6 ) using a pcb board based on jesd 51 - 3. layer number of measurement board material board size single fr - 4 114.3mm x 76.2mm x 1.57mmt top copper pattern thickness footprints and t races 70 m (note 7 ) using a pcb board based on jesd 51 - 7. layer number of measurement board material board size 4 layers fr - 4 114.3mm x 76.2mm x 1.6mmt top 2 internal layers bottom copper pattern thickness copper pattern thickness copper pattern thickness footprints and traces 70 m 74.2mm x 74.2mm 35 m 74.2mm x 74.2mm 70 m 5 / 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm co., ltd. all rights reserved. 27.sep.2017 rev.001 www.rohm.com tsz22111 ? 15 ? 001 br24g256 xxx - 5 series operating conditions parameter symbol min typ max unit supply voltage v cc 1 .6 - 5 .5 v ambient operating temperature t a - 40 - + 8 5 c bypass capacitor c 0 .1 - - f input / output capacitance ( ta = 25 c , f=1mhz ) parameter symbol min typ max unit condition s input / output capaci tance (sda) (note 8 ) c i /o - - 8 pf v i/o =gnd in put capaci tance (scl, a0, a1, a2, wp) (note 8 ) c in - - 8 pf v in =gnd ( note 8 ) not 100% tested . input impedance ( u nless otherwise specified, ta = - 40 c to +85 c , v cc = 1.6v to 5.5v ) parameter symbol min typ max unit condition s input impedance 1 z ih 500 - - k 0.7v cc ? v in (a0, a1, a2, wp) period f rom start condition to stop condition input impedance 2 z il 30 - - k v in ? 0. 3 v cc (a0, a1, a2, wp) period f rom start condition to stop condition memory c ell c haracteristics (v cc =1.6v to 5.5v) parameter symbol min typ max unit conditions write cycles (note 9 ,10 ) - 4 ,000,000 - - t imes t a = 25 c data retention (note 9 ) - 20 0 - - y ears t a =55 c ( note 9 ) not 100% tested . ( note 10 ) the write cycles is defined for unit of 4 data bytes with the same address bits of w a14 to w a2 . electrical characteristics ( unless otherwise specified, ta = - 40 c to +85 c , v cc = 1.6v to 5.5v ) parameter symbol min typ max unit conditions input high voltage 1 v ih1 0.7v cc - v cc +1.0 v 1.7v ? v cc ? 5.5v input low voltage 1 v il1 - 0 .3 (note 1 1 ) - + 0.3v cc v 1.7v ? v cc ? 5.5v input high voltage 2 v ih 2 0.8v cc - v cc +1.0 v 1.6v ? v cc < 1.7v input low voltage 2 v il 2 - 0 .3 (note 1 1 ) - + 0. 2 v cc v 1.6v ? v cc < 1.7v output low voltage 1 v ol1 - - 0.4 v i ol = 3. 2ma , 2.5v ? v cc ? 5.5v (sda) output low voltage 2 v ol2 - - 0.2 v i ol =1.0ma , 1.6v ? v cc < 2 .5v (sda) input leakage current 1 i li 1 - 1 - +1 a v in =0 or v cc (a0, a1, a2, wp) standby mode in put leakage current 2 i li 2 - 1 - +1 a v in =0 to v cc ( scl ) output leakage current i lo - 1 - +1 a v out =0 to v cc (sda) supply current (write) i cc1 - - 2.0 m a v cc = 5 .5v, f sc l =1mhz, t wr = 5ms , byte w rite, p age w rite supply current (read) i cc2 - - 2.0 m a v cc =5 .5 v, f sc l =1mhz random r ead, c urrent r ead, s equential r ead standby current i sb - - 2. 5 a v cc =5.5v , sda, scl = v cc a0, a1, a2 , wp =gnd (note 1 1 ) when the pulse width is 50ns or less, it is - 1.0 v. 6 / 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm co., ltd. all rights reserved. 27.sep.2017 rev.001 www.rohm.com tsz22111 ? 15 ? 001 br24g256 xxx - 5 series ac c haracteristics ( unless otherwise specified, ta = - 40 c to +85 c , v cc = 1.6v to 5.5v ) parameter symbol min typ max unit clock frequency f scl - - 1 m hz data clock high period t high 260 - - ns data clock low period t low 500 - - ns sda, scl ( input ) rise time ( note 1 2 ) t r - - 120 ns sda, scl ( input ) fall time ( note 1 2 ) t f1 - - 120 ns sda ( output ) fall time ( note 1 2 ) t f2 - - 120 n s start condition hold ti me t hd:sta 250 - - ns start condition setup time t su:sta 200 - - n s input data hold time t hd:dat 0 - - n s input data setup time t su:dat 50 - - ns output data delay time t pd 50 - 450 n s output data hold time t dh 50 - - n s stop condition setup time t su :sto 250 - - n s bus free time t buf 500 - - n s write cycle time t wr - - 5 ms noise suppression time ( scl , sda ) t i - - 50 ns wp hold time t hd:wp 1.0 - - v wp setup time t su:wp 0.1 - - v wp high period t high:wp 1.0 - - v (note 1 2 ) not 100% tested . ac c haracteristics condition parameter symbol condition s unit load capacitance c l 100 pf i nput rise time t r 20 n s i nput fall time t f 1 20 n s input voltage v il /v ih 0.2v cc /0.8v cc v input / output data timing reference level - 0.3v cc /0.7v cc v 7 / 32 tsz02201 - 0ggg0g100890 - 1 - 2 ? 20 1 7 rohm co., ltd. all rights reserved. 27.sep.2017 rev.001 www.rohm.com tsz22111 ? 15 ? 001 br24g256 xxx - 5 series input / ou tpu t timing | , q s x w u h d g d w w k h u l v h h g j h r i 6 & |