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contents features ........................................................... 1 pin assignment ................................................ 1 block diagram .................................................. 1 instruction set .................................................. 2 absolute maximum ratings ............................. 2 recommended operating conditions .............. 2 rewriting times ............................................... 2 pin capacitance ............................................... 3 dc electrical characteristics............................ 3 ac electrical characteristics ............................ 4 operation ......................................................... 5 three-wire interface di-do direct connecting ........................... 8 ordering information ........................................ 9 characteristics ............................................... 10 dimensions .................................................... 14 discontinued product
seiko instruments inc. 1 s-29255a/29355 a cmos 2k/4k-bit serial e 2 prom the s-29255a (2k-bit) and s-29355a (4k-bit) are e 2 proms characterized by a wide operating voltage range and low power consumption. the organization is 128-word 16-bit and 256-word 16- bit, respectively. they are easily interfaced with a serial port because the instruction is composed of eight-bit units. also, through the reset pin, erroneous writing at power on/off can be avoided. ? ? package y 8-pin dip (pkg drawing code : dp008-a) y 8-pin sop (pkg drawing code : fe008-a) ? ? pin assignment ? ? block diagram ? ? features s-29255a : 2k-bit, instruction code conforming to m6m80021 s-29355a : 4k-bit, instruction code conforming to m6m80041 low power consumption operating: 2.0 ma max. standby: 1.0 m a max. wide operating voltage range write: 2.7 to 6.5 v read: 1.8 to 6.5 v easy interface with serial port memory protection by reset pin rewritings: 10 5 times/word data retention: 10 years operating temperature: -40 c to+85 c package: 8-pin dip/sop, bare chip figure 1 rdy/busy v cc 8-pin sop top view reset gnd do di cs s k cs sk di do v cc gnd rdy/busy reset chip select serial clock serial data input serial data output power supply voltage ground ready output/busy output reset input l : stable status h : reset write circuit (memory p rotection) rev.1.11 cs s k 8-pin dip top view v cc rdy/busy reset gnd di do figure 2 memory array data register address decoder mode decode logic clock generator output buffer do di cs sk write protection v cc gnd reset rdy/busy discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a 2 seiko instruments inc. nn instruction set nn absolute maximum ratings nn recommended operating conditions nn rewriting times table 4 (ta=-40c to 85c) parameter symbol min. typ. max. unit rewriting times n w 10 5 ? ? times/word instruction op code address data s-29255a s-29355a read (read data) 10101000 a 0 to a 6 0 a 0 to a 7 d 0 to d 15 program (program) 10100100 a 0 to a 6 0 a 0 to a 7 d 0 to d 15 wral (write all )* 10100001 a 0 to a 6 0 a 0 to a 7 d 0 to d 15 eral (erase all )* 10100010 xxxxxxxx xxxxxxxx ? ewen (program enable) 10100011 xxxxxxxx xxxxxxxx ? ewds (program disable) 10100000 xxxxxxxx xxxxxxxx ? status output busy flag 10101001 00xxxxxx 00xxxxxx 0 : busy 1 : ready write permission 10xxxxxx 10xxxxxx 0 : permission 1 : inhibit ecc flag 01xxxxxx 01xxxxxx "0" is always output** parameter symbol ratings unit power supply voltage v cc -0.3 to +7.0 v input voltage v in -0.3 to v cc +0.3 v output voltage v out -0.3 to v cc v storage temperature under bias t bias -50 to+95 c storage temperature t stg -65 to+150 c parameter symbol conditions min. typ. max. unit power supply voltage v cc read write 1.8 2.7 ? ? 6.5 6.5 v v high level input voltage v ih cs, sk di, reset v cc =1.8 to 2.7v 0.8v cc 0.7v cc 0.8v cc ? ? ? v cc v cc v cc v v v low level input voltage v il cs, sk di, reset v cc =1.8 to 2.7v 0.0 0.0 0.0 ? ? ? 0.2v cc 0.3v cc 0.2v cc v v v operating temperature t opr -40 ? +85 c table 1 x : doesn?t matter * : eral and wral are options. normally these can not be used. ** : s-29255a/29355a doesn't have redundant memory. table 2 table 3 v cc =2.7 to 6.5v v cc =2.7 to 6.5v discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a seiko instruments inc. 3 nn pin capacitance table 5 (ta=25c, f=1.0 mhz, v cc =5 v) parameter symbol conditions min. typ. max. unit input capacitance c in v in =0 v ? ? 8 pf output capacitance c out v out =0 v ? ? 10 pf nn dc electrical characteristics parameter smbl conditions read/write operations read operation unit v cc =5.0 v10 % v cc =3.0 v10 % v cc =1.8 to 2.7 v min. typ. max. min. typ. max. min. typ. max. current consumption (read) i cc1 do unloaded ? ? 2.0 ? ? 1.0 ? ? 0.5 ma current consumption (program) i cc2 do unloaded ? ? 5.0 ? ? 2.0 ? ? ? ma parameter smbl conditions read/write operations read operation unit v cc =5.0 v10 % v cc =2.7 to 6.5 v v cc =1.8 to 2.7 v min. typ. max. min. typ. max. min. typ. max. standby current consumption i sb input: v cc or gnd ? ? 1.0 ? ? 1.0 ? ? 1.0 ma input leakage current i li v in =gnd to v cc ? 0.1 1.0 ? 0.1 1.0 ? 0.1 1.0 ma output leakage current i lo v out =gnd to v cc ? 0.1 1.0 ? 0.1 1.0 ? 0.1 1.0 ma low level output voltage v ol cmos i ol =100 ma ? ? 0.1 ? ? 0.1 ? ? 0.1 v ttl i ol =2.1 ma ? ? 0.45 ? ? -- ? ? ? v high level output voltage v oh cmos v cc =2.7 to 6.5 v: i oh =-100 ma v cc =1.8 to 2.7 v: i oh =-10 ma v cc -0.7 ? ? v cc -0.7 ? ? v cc -0.3 ? ? v ttl i oh =-400 ma 2.4 ? ? ? ? ? ? ? ? v write enable latch data hold voltage v dh 1.5 ? ? 1.5 ? ? 1.5 ? ? v schmitt width v wd cs, sk v cc 0.1 ? ? v cc 0.1 ? ? 0.05 ? ? v table 6 (ta=-40c to 85c) table 7 (ta=-40c to 85c) discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a 4 seiko instruments inc. nn ac electrical characteristics table 8 measuring conditions input pulse voltage 0.1v cc to 0.9v cc output reference voltage 0.5v cc output load 100 pf parameter symbol read / write operations read operation unit v cc =5.0 v10 % v cc =2.7 to 6.5 v v cc =1.8 to 2.7 v min. typ. max. min. typ. max. min. typ. max. cs setup time t css 0.2 ? ? 0.4 ? ? 1.0 ? ? ms cs hold time t csh 0.2 ? ? 0.4 ? ? 1.0 ? ? ms cs setup time (cpu) t css(cpu) 0.2 ? ? 0.4 ? ? 1.0 ? ? ms cs hold time (cpu) t csh(cpu) 0.2 ? ? 0.4 ? ? 1.0 ? ? ms cs deselect time t cds 0.4 ? ? 1.0 ? ? 2.0 ? ? ms data setup time t ds 0.2 ? ? 0.4 ? ? 0.8 ? ? ms data hold time t dh 0.2 ? ? 0.4 ? ? 0.8 ? ? ms 1 data output delay t pd1 ? ? 0.4 ? ? 1.0 ? ? 2.0 ms 0 data output delay t pd0 ? ? 0.4 ? ? 1.0 ? ? 2.0 ms clock frequency f sk 0.0 ? 2.0 0.0 ? 1.0 0.0 ? 0.2 mhz clock pulse width t skh, t skl 0.25 ? ? 0.5 ? ? 2.5 ? ? ms output disable time t hz 0 50 150 0 500 1000 ? ? ? ns program time t pr ? 4.0 10 ? 4.0 10 ? ? ? ms table 9 (ta=-40c to 85c) figure 3 timing chart valid data valid data t skh t skl t csh t cds t pd0 t pd1 t css t ds di sk do cs t dh input data is fetched at the rise of sk. output data is triggered at the fall of sk. figure 4 timing chart of t css(cpu) and t csh(cpu) when connected to cpu t css(cpu) sk t csh(cpu) cs discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a seiko instruments inc. 5 nn operation for each instraction, input op code, address and data per table 1. after cs goes from ?h? to ?l?, di is latched, synchronized with the rise of sk. after the entire data is latched, the instructions input can be completed by changing cs to ?h?. even after changing cs to low, instructions can not be latched by inputting a pulse to sk while di remains low. note: between instructions, cs must be ?h? during t cds. 1. read mode (read) the read instruction reads data from the specified address. through the read instruction, the op code and address are latched, synchronized with the rise of sk. at the falling edge of the 16th sk clock cycle from the start bit, (and all of the addresses are input), do changes from high impedance (hi-z) status to data output status, and data is output, synchronized with the fall of sk. 2. write mode (program, wral, and eral) there are three write instructions, program, wral, and eral. each write instruction automatically starts the write operation to nonvolatile memory after completing the specified clock input. the write operation is completed in 10 ms (tpr max.) , and the average write period is 4 to 5 ms. the s-29255a/29355a offer the following two methods to check the completion of the write operation to choose the shortest writing cycle. by reading the status of the rdy/busy output pin while the write operation is continued, low level is output. and when the write operation is completed, high level is output. by reading the status output signal after inputting a write instruction, a status output instruction must be performed (for the status output instruction, refer to ?4. status output?) . note: after starting the write operation, cs need not be ?h?. during the write operation, no instruction can be accepted except for status output. when using sk or di during the write operation, the sk and di signals should not be a status output instruction, or, cs must be ?h?. the write operation can be performed when the reset pin is at ?l?. after reset is ?h?, even during write operation, the write operation is terminated, and data is unstable. therefore, when writing is not performed, fix the reset pin at ?h? to inhibit all write operation and to avoid erroneous writing. when the status output instruction is input after the write instruction, cs need not be ?h?. * 0 0 0 a6 a7 17 16 15 14 13 12 4 2 1 t hz d0 d14 12 11 10 9 8 7 6 5 cs d15 sk di do a0 a5 a4 a3 a2 a1 31 32 3 15 17 0 1 1 0 1 * "l" for s-29255a. discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a 6 seiko instruments inc. 2.1 program (program) mode this mode writes 16-bit data to the specified address. after cs goes to ?l?, input op code, address, and 16-bit data. the write operation starts at the rising edge of the 32nd sk clock cycle from the start bit. it is not necessary to make the data be ?1? before the data write operation. figure 6 2.2 write all (wral) mode: option the same 16-bit data is written into all address areas in the memory. after cs changes from ?h? to ?l?, input the op code, address, and 16-bit data. the write operation starts at the rising edge of the 32nd sk clock cycle from the start bit. it is not necessary to make the data be ?1? before the data write operation. figure 7 2.3 erase all (eral) mode: option data in all address areas is erased. after erasing the data, all of the data is set to ?1?. after cs changes from ?h? to ?l?, input the op code and address. the erase operation starts at the rising edge of the 16th sk clock cycle from the start bit. figure 8 * 0 0 0 a7 17 16 15 14 13 12 write operation starts hi-z t pr 4 2 1 d0 d14 12 11 10 9 8 7 6 5 cs d15 sk di do a0 a6 a5 a4 a3 a2 a1 31 32 3 15 17 0 1 1 0 1 rdy/ busy * ?l? for the s-29255a * * 17 16 15 14 13 12 write operation starts hi-z t pr 4 2 1 d0 d14 12 11 10 9 8 7 6 5 cs d15 sk di do * * * * * * 31 32 3 0 1 1 0 1 0 0 0 rdy/ busy * * 16 15 14 13 12 erase operation start hi-z t pr 4 2 1 11 10 9 8 7 6 5 cs sk di do * * * * * * 3 0 1 1 0 1 0 0 0 rdy/ busy discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a seiko instruments inc. 7 3. program enable (ewen) and program disable (ewds) modes ewen enables the write operation, and ewds disables the write operation. the status to enable the write operation is called the program enable mode, and the status to disable the write operation is called the program disable mode. the s- 29255a/29355a is in program disable mode when the power is turned on. to prevent unexpected erroneous writing because of noise and cpu runaway, the s-29255a/29355a should be in program disable mode when writing is not performed. 4. status output the status output instruction outputs several kinds of ic inside status (ready/busy, write inhibit/permit, and ecc set). through the status output instruction, the op code and flag set code are latched, synchronized with the rise of sk. at the falling edge of 16th clock cycle from the start bit, do is changed from high impedance (hi-z) status to data output status, and the data that shows the ic inside status is output synchronized with the fall of sk. the data is retained until cs goes to ?h?. note : even if the sk and di inputs are changed when outputting data, the output data is not changed. figure 10 5. reset operation after reset goes to ?h? during the write operation, the write operation is terminated. at that time, only read, ewen, ewds, and the status output instruction can be performed. although reset can be connected with cs, reset must be fixed at ?l? during writing. if reset goes to ?h? during writing, for 0.1 ms from the rise of reset, no instruction except for status output can be accepted. figure 9 * * 16 15 14 13 12 ewen ewds 1 0 1 0 hi-z 4 2 1 11 10 9 8 7 6 5 cs sk di do * * * * * * 3 0 1 1 0 0 0 flag name flag set ?l?output ?h?output remarks write status flag 00 during writing completed writing ? write permission flag 10 program enable mode program disable mode ? ecc flag 01 showing not modified ? for maintaining compatibility with m6m80021/41, ?l? is always output. redundant memory is not included. table 10 ic inside status * * 15 14 13 12 16 busy flag write permission ecc flag 0 1 0 0 0 1 hi-z 4 2 1 11 10 9 8 7 6 5 cs sk di do * * * * 3 0 1 1 0 0 1 0 1 t hz status output discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a 8 seiko instruments inc. ? ? three-wire interface di-do direct connecting please refer application note s-29 & s-93c series eeproms tips, tricks & traps for equivalent circuit of each pin. although usually, a four-wire interface with cs, sk, di, and do is used for configuring a serial interface, a three-wire interface can be also used for configuring a serial interface by connecting di and do. however, since the three-wire system has a possibility that the data output from the serial memory ic interferes with the data output from the cpu, install a resistor between di and do (see figure 11) to give preference to data output from cpu into di. figure 11 i/o sk sio cs sk di do cp s-29255a s-29355a 10k w to 100k w discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a seiko instruments inc. 9 nn ordering information s-29xxxa xx package dp : dip fe : sop ca : bare chip product name s-29255a: 2k-bit s-29355a: 4k-bit note: each bit is set to 1 before delivery (except bare chip) . discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a 10 seiko instruments inc. nn characteristics 1. dc characteristics 1.1 current consumption (read) i cc1 - ambient temperature ta 1.2 current consumption (read) i cc1 - ambient temperature ta 85 1.3 current consumption (read) i cc1 - power supply voltage v cc ta ( c) 1.4 current consumption (read) i cc1 - clock frequency f sk 10k 100k f sk (hz) 1m 2m i cc1 (ma) 1.0 0.5 0 i cc1 (ma) 1.0 0.5 0 2 3 4 5 6 7 v cc (v) ta=25 c f sk =1 mhz data=0101 -40 0 i cc1 (ma) 1.0 0.5 0 v cc =5.5v f sk =2 mhz data=0101 85 ta ( c) -40 0 i cc1 (ma) 0.4 0.2 0 v cc =3.3v f sk =1mhz data=0101 1.5 current consumption (program) i cc2 - ambient temperature ta 1.6 current consumption (program) i cc2 - ambient temperature ta 85 1.7 current consumption (program) i cc2 - power supply voltage v cc ta ( c) 1.8 standby current consumption i sb - ambient temperature ta i sb (a) 10 -6 10 -10 i cc2 (ma) 4.0 2.0 0 2 3 4 5 6 7 v cc (v) ta=25 c data 0101 v cc =6.5v -40 0 i cc2 (ma) 4.0 2.0 0 v cc =5.5v continuous program mode data 0101 85 ta ( c) -40 0 i cc2 (ma) 1.0 0.5 0 v cc =3.3v continuous program mode data 0101 10 -7 10 -8 10 -9 10 -11 85 ta ( c) -40 0 v cc =5.0v ta=25c discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a seiko instruments inc. 11 1.9 input leakage current i li - ambient temperature ta 1.10 input leakage current i li - ambient temperature ta 85 1.11 output leakage current i lo - ambient temperature ta ta ( c) 1.12 output leakage current i lo - ambient temperature ta i lo (ma) 1.0 0.5 0 i lo (ma) 1.0 0.5 0 -40 0 i li (ma) 1.0 0.5 0 v cc =5.5v cs, sk, di=0v 85 ta ( c) -40 0 i li (ma) 1.0 0.5 0 v cc =5.5v cs, sk, di=5.5v 85 ta ( c) -40 0 v cc =5.5v do=0v 85 ta ( c) -40 0 v cc =5.5v do=5.5v 1.13 high level output voltage v oh - ambient temperature ta 1.14 high level output voltage v oh - ambient temperature ta 85 1.15 low level output voltage v ol - ambient temperature ta ta ( c) 1.16 low level output voltage v ol - ambient temperature ta -40 0 v oh (v) 4.4 4.2 v cc =4.5v i oh =-400ma 4.6 85 ta ( c) -40 0 v oh (v) 2.5 v cc =2.7v i oh =-100ma 2.7 85 ta ( c) -40 0 v ol (v) 0.2 0.1 v cc =4.5v i ol =2.1ma 0.3 85 ta ( c) -40 0 v ol (mv) 20 10 v cc =2.7v i ol =100ma 30 2.6 0 0 discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a 12 seiko instruments inc. 1.17 high level output current i oh - ambient temperature ta 1.18 high level output current i oh - ambient temperature ta 1.19 low level output current i ol - ambient temperature ta 1.20 low level output current i ol - ambient temperature ta 1.21 input reversal voltage v inv - power supply voltage v cc 1.22 input reversal voltage v inv - power supply voltage v cc i oh (ma) -5.0 -2.5 0 85 ta ( c) -40 0 v cc =4.5v v oh =3.8v i oh (ma) -2.0 -1.0 0 85 ta ( c) -40 0 v cc =2.7v v oh =2.0v i ol (ma) 20 10 0 85 ta ( c) -40 0 v cc =4.5v v oh =0.45v i ol (ma) 2.0 1.0 0 85 ta ( c) -40 0 v cc =2.7v v ol =0.1v v inv (v) 4.0 2.0 1 v cc (v) ta=25 c di and reset pins 2 3 4 5 6 7 v inv (v) 4.0 2.0 0 1 v cc (v) ta=25 c cs and sk pins 2 3 4 5 6 7 v ih v il 1.23 input reversal voltage v inv - ambient temperature ta 1.24 input reversal voltage v inv - ambient temperature ta 4.0 2.0 85 ta ( c) -40 0 4.0 2.0 85 ta ( c) -40 0 v inv (v) v inv (v) v cc =5.0v cs and sk pins v ih v il v cc =5.0v di and reset discontinued product
cmos 2k/4k-bit serial e 2 prom s-29255a/29355a seiko instruments inc. 13 2. ac characteristics 2.1 maximum operating frequency f max - power supply voltage v cc 2.2 program time t pr - power supply voltage v cc t pr (ms) 4 2 2 3 4 5 6 7 v cc (v) ta=25c 1 2.3 program time t pr - ambient temperature ta 2.4 program time t pr - ambient temperature ta 85 ta ( c) -40 0 t pr (ms) 4 2 v cc =5.0v 6 85 ta ( c) -40 0 t pr (ms) 4 2 v cc =3.0v 6 2.5 1 data output delay time t pd1 - ambient temperature ta 85 ta ( c) -40 0 t pd1 (ms) 0.2 0.1 0.3 2.6 1 data output delay time t pd1 - ambient temperature ta 85 ta ( c) -40 0 t pd1 (ms) 0.3 0.2 0.4 v cc =4.5v data?0???1? v cc =2.7v data?0???1? 2.7 0 data output delay time t pd0 - ambient temperature ta 85 ta ( c) -40 0 t pd0 (ms) 0.2 0.1 0.3 2.8 0 data output delay time t pd0 - ambient temperature ta 85 ta ( c) -40 0 t pd0 (ms) 0.2 0.1 0.3 v cc =4.5v data?1???0? v cc =2.7v data?1???0? 0 0 0 0 10k 100k 1m 2m 2 3 4 5 1 ta=25 c f max (hz) v cc (v) discontinued product

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the information described herein is subject to change without notice. seiko instruments inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. the application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. when the products described herein are regulated products subject to the wassenaar arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. use of the information described herein for other purposes and/or reproduction or copying without the express permission of seiko instruments inc. is strictly prohibited. the products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of seiko instruments inc. although seiko instruments inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. the user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. discontinued product

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