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1 m e m o r y all data sheets are subject to change without notice (858) 503-3300 - fax: (858) 503-3301 - www.maxwell.com 256k (32k x 8-bit) otp eprom 27c256t ?2003 maxwell technologies all rights reserved. 06.24.02 rev 4 f eatures : ? 32k x 8-bit otp eprom organization r ad -p ak ? radiation-hardened against natural space radiation total dose hardness: - > 100 krad (si), depending upon space mission excellent single event effects: -sel th > 80 mev/mg/cm2 -seu th > 80 mev/mg/cm2 package: -32 pin r ad -p ak ? flat pack -32 pin r ad -p ak ? dip fast access time: - 120, 150, 200 ns (max) low power dissipation: - active mode: 100 mw/mhz (typ) - standby mode: 10 w (typ) page programming time: 14 sec (typ) programming power supply: - v pp = 12.5 v one-time programmable pin arrangement - jedec standard byte-wide eprom - flash memory and mask rom compatible d escription : maxwell technologies? 27c256t high density 256-kilobit one- time programmable electrically programmable read only mem- ory microcircuit features a greater than 100 krad (si) total dose tolerance, depending upon space mission. the 27c256t features fast address times and low power dissipation. the 27c256t offers high speed programming using page pro- gramming mode. maxwell technologies' patented r ad -p ak ? packaging technol- ogy incorporates radiation shielding in the microcircuit pack- age. it eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. in a geo orbit, r ad -p ak ? provides greater than 100 krad (si) radiation dose tolerance. this product is available with screening up to class s. x-decoder 1024 x 1022 memory matrix input data control y- gating y - decoder h a0-a4 a10-a11 oe pgm a5-a9 v cc v pp v ss a12-a16 i/o0 i/o15 h ce : high threshhold inverter logic diagram 27c256t nc i/o 7 a12-a14
m e m o r y 2 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 t able 1. 27c256t p inout d escription p in s ymbol d escription 1v pp programming voltage 2, 3, 30 nc not connected 12-5, 27, 26, 23, 25, 4, 28, 29 a0-a14 address enable 22 ce chip enable 24 oe output enable 13-15, 17-21 i/o0 - i/o7 data input/output 16 gnd ground 31 pgm program 32 v cc +5v power supply t able 2. 27c256t a bsolute m aximum r atings parameter symbol min max unit supply voltage 1 1. relative to v ss . v cc -0.6 +7.0 v programming voltage 1 v pp -0.6 +13.5 v all input and output voltage 1,2 2. v in , v out , and v id min = -1.0v for pulse width < 20 ns. v in , v out -0.6 +7.0 v a9 and oe voltage v id -0.6 13.0 v thermal resistance t jc 1.26 c/w operating temperature range t opr -55 +125 c storage temperature range t stg -65 +125 c t able 3. d elta l imits p arameter v ariation i cc 1 10% i cc 2 10% i cc 3a 10% i cc 3b 10%
m e m o r y 3 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 t able 4. 27c256t r ecommended o perating c onditions p arameter s ymbol m in m ax u nits supply voltage v cc 4.5 5.5 v input voltage v il -0.3 1 1. v il min = -1.0v for pulse width < 50 ns. 0.8 v v ih 2.2 v cc +1 2 2. v ih max = v cc + 1.5v for pulse width < 20 ns. operating temperature range t opr -55 +125 c t able 5. 27c256t c apacitance 1 1. guaranteed by design. parameter symbol min max unit input capacitance c in -- 10 pf output capacitance c out -- 15 pf t able 6. 27c256t dc e lectrical c haracteristics for r ead o peration (v cc = 5v + 10%, v pp = v ss to v cc , t a = -55 to +125 c, unless otherwise specified ) parameter test condition symbol s ubgroups min typ max unit input leakage current v in = 5.5 v i li 1, 2, 3 -- -- 2 a output leakage current v out = 5.5 v/0.45 v i lo 1, 2, 3 -- -- 2 a standby v cc current ce = v ih i cc1 1, 2, 3 -- -- 1 ma operating v cc current i out = 0 ma, ce = v il i cc2 1, 2, 3 -- -- 30 ma i out = 0 ma, f = 5 mhz i cc3a 1, 2, 3 -- -- 30 i out = 0 ma, f = 10 mhz i cc3b 1, 2, 3 -- -- 50 v pp current v pp = 5.5 v i pp1 1, 2, 3 -- 1 20 a input voltage v ih 1, 2, 3 2.2 -- -- v v il 1, 2, 3 -- 0.8 output voltage i oh = -400 a v oh 1, 2, 3 2.4 -- -- v i ol = 2.1 ma v ol 1, 2, 3 -- -- 0.45
m e m o r y 4 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 t able 7. 27c256t ac e lectrical c haracteristics for r ead o peration 1 , 2 (v cc = 5v + 10%, v pp = v ss to v cc , t a = -55 to +125 c, unless otherwise specified ) 1. t df is defined as the time at which the output becomes an open circuit and data is no longer driven. 2. ac electrical parameters for programming operations are not tested. these are guaranteed by design. parameter test condition symbol subgroups min max unit address access time -120 -150 -200 ce = oe = v il t acc 9, 10, 11 -- -- -- 120 150 200 ns chip enable access time -120 -150 -200 oe = v il t ce 9, 10, 11 -- -- -- 120 150 200 ns output enable access time -120 -150 -200 ce = v il t oe 9, 10, 11 -- -- -- 60 70 70 ns output hold to address change -120 -150 -200 ce = v il t oh 9, 10, 11 0 0 0 -- -- -- ns output disable to high-z 3 -120 -150 -200 3. test conditions: - input pulse levels 0.45v/2.4v - input rise and fall times < 10 ns - output load 1ttl fate + 100 pf (including scope and jig) - referenced levels for measuring timing 0.8v/2.0v ce = oe = v il t df 9, 10, 11 0 0 0 50 50 50 ns
m e m o r y 5 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 t able 8. 27c256t ac e lectrical c haracteristics for p rogramming o peration 1,2 (v cc = 6.0v + 0.25v, v pp = 12.5v + 0.3v, t a = 25 c) 1. t df is defined as the time at which the output becomes an open circuit and data is no longer driven. 2. ac electrical parameters for programming operations are not tested. these are guaranteed by design. parameter symbol subgroups min typ max unit address setup time t as 9, 10, 11 2 -- -- s address hold time t ah 9, 10, 11 0 -- -- s data setup time t ds 9, 10, 11 2 -- -- s data hold time t dh 9, 10, 11 2 -- -- s v pp setup time t vps 9, 10, 11 2 -- -- s v cc setup time t vcs 9, 10, 11 2 -- -- s output enable setup time t oes 9, 10, 11 2 -- -- s output disable time t df 3 3. test conditions: - input pulse levels 0.45v/2.4v - input rise and fall times < 20 ns - referenced levels for measuring timing 0.8v/2.0v 9, 10, 11 0 -- 130 ns ce initial programming pulse width t pw 9, 10, 11 0.19 0.20 0.21 ms ce overprogramming pulse width t opw 9, 10, 11 0.19 -- 5.25 ms output enable hold time t oeh 9, 10, 11 2 -- -- s v pp recovery time t vr 9, 10, 11 2 -- -- s data valid from chip enable t dv 9, 10, 11 1 -- -- s t able 9. 27c256t dc e lectrical c haracteristics for p rogramming o perations 1,2,3,4 (v cc = 6.0v + 0.25v, v pp = 12.5v + 0.3v, t a = 25 c) 1. v cc must be applied before v pp and removed after v pp . 2. v pp must not exceed 13v, including overshoot. 3. do not change v pp from v il to 12.5v or 12.5v to v il when ce = low. 4. dc electrical parameters for programming operations are not tested. these are guaranteed by design. parameter test condition symbol subgroups min max unit input leakage current v in =0v to v cc i li 1, 2, 3 -- 2 a operating v cc current i cc 1, 2, 3 -- 30 ma operating v pp current ce =pgm =v il i pp 1, 2, 3 -- 40 ma input voltage 5 5. device reliability may be adversely affected if the device is installed or removed while v pp = 12.5v. v ih 1, 2, 3 2.2 v cc +0.5 6 v v il 1, 2, 3 -0.1 7 0.8 output voltage i oh =-400 a v oh 1, 2, 3 2.4 -- v i oh = 2.1ma v ol 1, 2, 3 -- 0.45
m e m o r y 6 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 6. if v ih is over the specified maximum value, programming operation can not be guaranteed. 7. v il min = -0.6v for pulse width < 20 ns. t able 10. 27c256t m ode s election m ode v pp v cc ce oe pgm a 9 i/o read v cc v cc v il v il v ih x 1 1. x = don?t care. v pp =0v to v cc d out output disable v cc v cc v il v ih v ih x high-z standby v cc v cc v ih xxx high-z program v pp v cc v il v ih v il xd in program verify v pp v cc v il v il v ih xd out page data latch v pp v cc v ih v il v ih xd in page program v pp v cc v ih v ih v il x high-z program inhibit v cc v cc v il v il v il x high-z v pp v cc v il v ih v ih x high-z v pp v cc v ih v il v il x high-z v pp v cc v ih v ih v ih x high-z identifier v cc v cc v il v il v ih v h 2 2. 11.5v < v h < 12.5v. id
m e m o r y 7 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 f igure 1. r ead t iming w aveform
m e m o r y 8 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 f igure 2. p age p rogramming f lowchart start set page prog. mode v pp =12.5+ 0.3v, v cc =6.0+ 0.25v address=0 n=0 latch address+1 address address+1 address latch address+1 address latch latch address+1 address b a a n+1 n set page prog./ verify mode v pp =12.5+ 0.3v, v cc =6.0+ 0.25v program t pw =0.2ms+ 5% n=25 verify program t opw =0.2ms last address? b set page mode v cc =5.0+ 0.25v, v pp =v cc read all address end fail nogo go yes no go nogo no yes
m e m o r y 9 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 f igure 3. p age p rogramming t iming w aveform
m e m o r y 10 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 f igure 4. b yte p rogramming f lowchart n+1 n program t pw =1ms+ 5% n=25 verify program t opw =0.2ms last address? set page mode v cc =5.0+ 0.25v, v pp =v cc read all address end fail nogo go yes no go nogo no yes set prog./verify mode v pp =12.5+ 0.3v, v cc =6.0+ 0.25v start address=0 n=0 address+1 address
m e m o r y 11 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 f igure 5. b yte p rogramming t iming w aveform d evice i dentifier m ode d escription the device identifier mode allows binary codes to be read from the outputs that identify the manufacturer and the type of device. using this mode with programming equipment, the device will automatically match its own erase and pro- gramming algorithm. 1. v cc = 5.0v + 10%. 2. a 9 = 12.0v + 0.5v. 3. a 1 -a 8 , a 10 -a 14 , ce , oe = v il , pgm = v ih . 4. x = don?t care. 27c256t s eries i dentifier c ode i dentifier a 0 i/o 7 i/o 6 i/o 5 i/o 4 i/o 3 i/o 2 i/o 1 i/o 0 h ex d ata m anufacturer c ode v il 00000111 07 d evice c ode v ih 00111000 38
m e m o r y 12 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 note: all dimensions in inches 32 p in r ad -p ak ? d ual i n l ine p ackage 1 1. standard product screening flow mil-std-883, method 2001, constant acceleration: for this package type constant acceleration is 3000g?s. s ymbol d imension m in n om m ax a -- 0.215 0.240 b 0.014 0.018 0.026 b2 0.045 0.050 0.065 c 0.008 0.010 0.018 d -- 1.600 1.680 e 0.510 0.590 0.620 ea 0.600 bsc ea/2 0.300 bsc e 0.100 bsc l 0.135 0.145 0.155 q 0.015 0.035 0.070 s1 0.005 0.025 -- s2 0.005 -- -- n32
m e m o r y 13 all data sheets are subject to change without notice ?2003 maxwell technologies all rights reserved. 256k (32k x 8-bit) otp eprom 27c256t 06.24.03 rev 4 important notice: these data sheets are created using the chip manufacturers published specifications. maxwell technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. the specifications presented within these data sheets represent the latest and most accurate information available to date. however, these specifications are subject to change without notice and maxwell technologies assumes no responsibility for the use of this information. maxwell technologies? products are not authorized for use as critical components in life support devices or systems without express written approval from maxwell technologies. any claim against maxwell technologies must be made within 90 days from the date of shipment from maxwell tech- nologies. maxwell technologies? liability shall be limited to replacement of defective parts.

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