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2k x 8 reprogrammable prom cy7c291a cy7c292a/cy7c293a cypress semiconductor corporation ? 3901 north first street san jose ca 95134 408-943-2600 document #: 38-04011 rev. ** revised march 14, 2002 92a features ? windowed for reprogrammability cmos for optimum speed/power high speed ? 20 ns (commercial) ? 25 ns (military) low power ? 660 mw (commercial and military) low standby power ? 220 mw (commercial and military) eprom technology 100% programmable slim 300-mil or standard 600-mil packaging available 5v 10% v cc , commercial and military ttl-compatible i/o direct replacement for bipolar proms capable of withstanding >2001v static discharge functional description the cy7c291a, cy7c292a, and cy7c293a are high-perfor- mance 2k-word by 8-bit cmos proms. they are functionally identical, but are packaged in 300-mil (7c291a, 7c293a) and 600-mil wide plastic and hermetic dip packages (7c292a). the cy7c293a has an automatic power down feature which reduces the power consumption by over 70% when deselect- ed. the 300-mil ceramic package may be equipped with an erasure window; when exposed to uv light the prom is erased and can then be reprogrammed. the memory cells uti- lize proven eprom floating-gate technology and byte-wide intelligent programming algorithms. the cy7c291a, cy7c292a, and cy7c293a are plug-in re- placements for bipolar devices and offer the advantages of lower power, reprogrammability, superior performance and programming yield. the eprom cell requires only 12.5v for the supervoltage and low current requirements allow for gang programming. the eprom cells allow for each memory loca- tion to be tested 100%, as each location is written into, erased, and repeatedly exercised prior to encapsulation. each prom is also tested for ac performance to guarantee that after cus- tomer programming the product will meet dc and ac specifi- cation limits. a read is accomplished by placing an active low signal on cs 1 , and active high signals on cs 2 and cs 3 . the contents of the memory location addressed by the address line (a 0 ? a 10 ) will become available on the output lines (o 0 ? o 7 ). logic block diagram pin configurations o 7 o 6 o 5 o 4 o 3 o 2 o 1 o 0 program- mable array multi- plexer gnd 1 2 3 4 5 6 7 8 9 10 11 14 15 16 20 19 18 17 21 24 23 22 a 6 a 5 a 4 a 3 a 2 a 1 a 0 o 0 a 7 o 3 v cc a 8 a 9 a 10 o 7 o 6 o 5 o 4 cs 1 o 2 12 13 o 1 cs 3 cs 2 28 4 5 6 7 8 9 10 321 27 1314151617 26 25 24 23 22 21 20 11 12 19 a 5 v cc gnd a 6 a 7 o 3 o 1 o 0 18 o 4 o 5 nc a 0 a 4 a 3 a 10 nc a 8 a 9 nc nc cs 1 cs 2 o 7 o 6 a 2 a 1 cs 3 o 2 cs 1 cs 2 cs 3 power down 7c293a window available on 7c291a and 7c293a only. dip lcc/plcc (opaque only) top view top view address decoder a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 8 a 9 a 10 a 7 column address row address 7c291a 7c292a 7c293a 7c291a 7c293a
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 2 of 17 maximum ratings (above which the useful life may be impaired. for user guide- lines, not tested.) storage temperature ......................................? 65 c to+150 c ambient temperature with power applied ................................................... ? 55 c to+125 c supply voltage to ground potential ..................? 0.5v to+7.0v dc voltage applied to outputs in high z state ......................................................? 0.5v to+7.0v dc input voltage .................................................? 3.0v to +7.0v dc program voltage .....................................................13.0v uv exposure.................................................7258 wsec/cm 2 static discharge voltage............................................>2001v (per mil-std-883, method 3015) latch-up current..................................................... >200 ma selection guide 7c291a-20 7c292a-20 7c293a-20 7c291a-25 7c292a-25 7c293a-25 7c291al-25 7c292al-25 7c293al-25 7c291a-35 7c292a-35 7c293a-35 7c291al-35 7c292al-35 7c293al-35 7c291a-50 7c292a-50 7c293a-50 7c291al-50 7c292al-50 7c293al-50 maximum access time (ns) 20 25 35 50 maximum operating current (ma) standard commercial 120 90 90 90 military 120 90 90 l commercial 60 60 60 standby current (ma) 7c293a only commercial 40 30 30 30 military 40 40 40 operating range range ambient temperature v cc commercial 0 c to + 70 c 5v 10% industrial [1] ? 40 c to + 85 c 5v 10% military [2] ? 55 c to + 125 c 5v 10% notes: 1. contact a cypress representative for industrial temperature range spec- ifications. 2. t a is the ? instant on ? case temperature.
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 3 of 17 electrical characteristics over the operating range [3,4] 7c291a-20 7c292a-20 7c293a-20 7c291a-25 7c292a-25 7c293a-25 7c291al-25 7c292al-25 7c293al-25 parameter description test conditions min. max. min. max. min. max. unit v oh output high voltage v cc = min., i oh = ? 4.0 ma 2.4 2.4 2.4 v v ol output low voltage v cc = min., i ol = 16.0 ma 0.4 0.4 0.4 v v ih input high voltage guaranteed input logical high voltage for all inputs 2.0 v cc 2.0 v cc 2.0 v cc v v il input low voltage guaranteed input logical low voltage for all inputs 0.8 0.8 0.8 v i ix input load current gnd < v in < v cc ? 10 +10 ? 10 +10 ? 10 +10 a v cd input diode clamp voltage note 4 i oz output leakage current gnd < v out < v cc , output disabled ? 10 +10 ? 10 +10 ? 10 +10 a i os output short circuit current [5] v cc = max., v out = gnd ? 20 ? 90 ? 20 ? 90 ? 20 ? 90 ma i cc v cc operating supply current v cc = max., i out = 0 ma com ? l 120 90 60 ma mil 120 i sb standby supply current (7c293a only) v cc = max., cs 1 = v ih com ? l 40 30 30 ma mil 40 v pp programming supply voltage 12 13 12 13 12 13 v i pp programming supply current 50 50 50 ma v ihp input high programming voltage 3.0 3.0 3.0 v v ilp input low programming voltage 0.4 0.4 0.4 v notes: 3. see the last page of this specification for group a subgroup testing information. 4. see the ? introduction to cmos proms ? section of the cypress data book for general information on testing. 5. for test purposes, not more than one output at a time should be shorted. short circuit test duration should not exceed 30 sec onds.
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 4 of 17 electrical characteristics over the operating range [3,4] (continued) 7c291al-35, 50 7c292al-35, 50 7c293al-35, 50 7c291a-35, 50 7c292a-35, 50 7c293a-35, 50 parameter description test conditions min. max. min. max. unit v oh output high voltage v cc = min., i oh = ? 4.0 ma 2.4 2.4 v v ol output low voltage v cc = min., i ol = 16.0 ma 0.4 0.4 v v ih input high voltage guaranteed input logical high voltage for all inputs 2.0 2.0 v v il input low voltage guaranteed input logical low voltage for all inputs 0.8 0.8 v i ix input load current gnd < v in < v cc ? 10 +10 ? 10 +10 a v cd input diode clamp voltage note 4 i oz output leakage current gnd < v out < v cc , output disabled ? 10 +10 ? 10 +10 a i os output short circuit current [5] v cc = max., v out = gnd ? 20 ? 90 ? 20 ? 90 ma i cc v cc operating supply current v cc = max., v in = 2.0v i out =0 ma commercial 60 90 ma military 90 i sb standby supply current (7c293a only) v cc = max., cs 1 =v ih commercial 30 30 ma military 40 v pp programming supply voltage 12 13 12 13 v i pp programming supply current 50 50 ma v ihp input high programming voltage 3.0 3.0 v v ilp input low programming voltage 0.4 0.4 v capacitance [4] parameter description test conditions max. unit c in input capacitance t a = 25 c, f = 1 mhz, v cc = 5.0v 10 pf c out output capacitance 10 pf
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 5 of 17 ac test loads and waveforms [4] t pu t aa t hzcs t acs 50% 50% t pd 3.0v 5v output r1250 ? r2 167 ? 30pf including jig and scope gnd 90% 10% 90% 10% <5ns <5 ns 5v output 5pf including jig and scope (a) normal load (b) high z load output 2.0v equivalent to: th venin equivalent 100 ? r1250 ? r2 167 ? all input pulses cs 2 ? cs 3 cs 1 v cc supply current a 0 ? a 10 address o 0 -o 7 switching characteristics over the operating range [3, 4] 7c291a-20 7c292a-20 7c293a-20 7c291a-25 7c292a-25 7c293a-25 7c291al-25 7c292al-25 7c293al-25 7c291a-35 7c292a-35 7c293a-35 7c291al-35 7c292al-35 7c293al-35 7c291a-50 7c292a-50 7c293a-50 7c291al-50 7c292al-50 7c293al-50 parameter description min. max. min. max. min. max. min. max. unit t aa address to output valid 20 25 35 50 ns t hzcs1 chip select inactive to high z 15 15 20 20 ns t acs1 chip select active to output valid 15 15 20 20 ns t hzcs2 chip select inactive to high z (7c293a cs 1 only) [6] 22 27 35 45 ns t acs2 chip select active to output valid (7c293a cs 1 only) [6] 22 27 35 45 ns t pu chip select active to power-up (7c293a cs 1 only) 0 0 0 0 ns t pd chip select inactive to power-down (7c293a cs 1 only) 22 27 35 45 ns note: 6. t hzcs2 and t acs2 refer to 7c293a cs 1 only.
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 6 of 17 erasure characteristics wavelengths of light less than 4000 angstroms begin to erase these proms. for this reason, an opaque label should be placed over the window if the prom is exposed to sunlight or fluorescent lighting for extended periods of time. the recommended dose of ultraviolet light for erasure is a wavelength of 2537 angstroms for a minimum dose (uv inten- sity x exposure time) of 25 wsec/cm2. for an ultraviolet lamp with a 12 mw/cm 2 power rating, the exposure time would be approximately 35 minutes. these proms need to be within 1 inch of the lamp during erasure. permanent damage may result if the prom is ex- posed to high-intensity uv light for an extended period of time. 7258 wsec/cm 2 is the recommended maximum dosage. programming information programming support is available from cypress as well as from a number of third-party software vendors. for detailed programming information, including a listing of software pack- ages, please see the prom programming information located at the end of this section. programming algorithms can be ob- tained from any cypress representative. table 1. mode selection pin function [7] read or output disable a 10 ? a 0 cs 3 cs 2 cs 1 o 7 ? o 0 mode other a 10 ? a 0 pgm vfy v pp d 7 ? d 0 read a 10 ? a 0 v ih v ih v il o 7 ? o 0 output disable [8] a 10 ? a 0 x x v ih high z output disable a 10 ? a 0 x v il x high z output disable a 10 ? a 0 v il x x high z program a 10 ? a 0 v ilp v ihp v pp d 7 ? d 0 program verify a 10 ? a 0 v ihp v ilp v pp o 7 ? o 0 program inhibit a 10 ? a 0 v ihp v ihp v pp high z intelligent program a 10 ? a 0 v ilp v ihp v pp d 7 ? d 0 blank check zeros a 10 ? a 0 v ihp v ilp v pp zeros notes: 7. x = ? don ? t care ? but not to exceed v cc +5%. 8. the power-down mode for the cy7c293a is activated by deselecting cs 1 . figure 1. programming pinouts 1 2 3 4 5 6 7 8 9 10 11 12 16 17 18 19 20 24 23 22 21 13 14 a 8 a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 d 0 d 1 d 2 gnd v cc d 7 d 6 d 4 d 5 d 3 15 a 9 a 10 v pp vfy pgm 28 4 5 6 7 8 9 10 321 27 1314151617 26 25 24 23 22 21 20 11 12 19 a 5 v cc gnd a 6 a 7 d 3 d 1 d 0 18 d 4 d 5 nc a 0 a 4 a 3 a 8 nc nc d 7 d 6 a 2 a 1 d 2 a 10 v pp vfy pgm nc a 9 dip lcc/plcc (opaque only) top view top view 7c291a 7c291a 7c292a 7c293a 7c293a
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 7 of 17 typical dc and ac characteristics 1.4 1.6 1.0 0.8 4.0 4.5 5.0 5.5 6.0 ? 55 25 125 1.2 1.1 1.2 1.0 0.8 0.6 4.0 4.5 5.0 5.5 6.0 normalized access time supply voltage (v) normalized supply current vs. supply voltage normalized supply current vs. ambient temperature ambient temperature ( c) supply voltage (v) normalized access time vs. supply voltage 0.6 1.2 1.0 0.9 0.8 normalized i cc normalized i cc t a =25 c 0.4 t a =25 c f= f max 1.6 1.4 1.2 1.0 0.8 ? 55 125 normalized access time ambient temperature ( c) normalized access time vs. temperature 0.6 60 50 40 30 20 10 0 1.0 2.0 3.0 output source current (ma) output voltage (v) 30.0 25.0 20.0 15.0 10.0 5.0 0 200 400 600 800 delta t (ns) aa capacitance (pf) typical access time change vs. output loading 4.0 0.0 1000 v cc =4.5v t a =25 c 25 0 output source current vs. voltage 150 175 125 75 50 25 0.0 1.0 2.0 3.0 output sink current (ma) 0 100 output voltage (v) output sink current vs. output voltage v cc =5.0v t a =25 c 4.0 1.00 1.02 0.98 0.94 0.92 0.90 025 5075 100 0.88 0.96 i cc vs. cycle period cycle period (ns) normalized i cc v cc =5.5v t a =25 c
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 8 of 17 ordering information [9] speed (ns) i cc (ma) ordering code package name package type operating range 20 120 cy7c291a-20jc j64 28-lead plastic leaded chip carrier commercial cy7c291a-20pc p13 24-lead (300-mil) molded dip cy7c291a-20sc s13 24-lead molded soic cy7c291a-20wc w14 24-lead (300-mil) windowed cerdip 25 60 cy7c291al-25jc j64 28-lead plastic leaded chip carrier commercial cy7c291al-25pc p13 24-lead (300-mil) molded dip cy7c291al-25wc w14 24-lead (300-mil) windowed cerdip 90 cy7c291a-25jc j64 28-lead plastic leaded chip carrier cy7c291a-25pc p13 24-lead (300-mil) molded dip cy7c291a-25sc s13 24-lead molded soic cy7c291a-25wc w14 24-lead (300-mil) windowed cerdip 120 cy7c291a-25dmb d14 24-lead (300-mil) cerdip military cy7c291a-25lmb l64 28-square leadless chip carrier cy7c291a-25qmb q64 28-pin windowed leadless chip carrier cy7c291a-25tmb t73 24-lead windowed cerpack cy7c291a-25wmb w14 24-lead (300-mil) windowed cerdip 30 120 cy7c291a-30dmb d14 24-lead (300-mil) cerdip military cy7c291a-30lmb l64 28-square leadless chip carrier cy7c291a-30qmb q64 28-pin windowed leadless chip carrier cy7c291a-30tmb t73 24-lead windowed cerpack cy7c291a-30wmb w14 24-lead (300-mil) windowed cerdip 35 60 cy7c291al-35jc j64 28-lead plastic leaded chip carrier commercial cy7c291al-35pc p13 24-lead (300-mil) molded dip cy7c291al-35wc w14 24-lead (300-mil) windowed cerdip 90 CY7C291A-35SC s13 24-lead molded soic commercial cy7c291a-35pc p13 24-lead (300-mil) molded dip cy7c291a-35wc w14 24-lead (300-mil) windowed cerdip 120 cy7c291a-35dmb d14 24-lead (300-mil) cerdip military cy7c291a-35lmb l64 28-square leadless chip carrier cy7c291a-35qmb q64 28-pin windowed leadless chip carrier cy7c291a-35tmb t73 24-lead windowed cerpack cy7c291a-35wmb w14 24-lead (300-mil) windowed cerdip note: 9. most of these products are available in industrial temperature range. contact a cypress representative for specifications and product availability.
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 9 of 17 50 60 cy7c291al-50jc j64 28-lead plastic leaded chip carrier commercial cy7c291al-50pc p13 24-lead (300-mil) molded dip cy7c291al-50wc w14 24-lead (300-mil) windowed cerdip 90 cy7c291a-50sc s13 24-lead molded soic commercial cy7c291a-50pc p13 24-lead (300-mil) molded dip cy7c291a-50wc w14 24-lead (300-mil) windowed cerdip 90 cy7c291a-50dmb d14 24-lead (300-mil) cerdip military cy7c291a-50lmb l64 28-square leadless chip carrier cy7c291a-50qmb q64 28-pin windowed leadless chip carrier cy7c291a-50tmb t73 24-lead windowed cerpack cy7c291a-50wmb w14 24-lead (300-mil) windowed cerdip 20 120 cy7c292a-20dc d12 24-lead (600-mil) cerdip commercial cy7c292a-20pc p11 24-lead (600-mil) molded dip 25 120 cy7c292a-25dc d12 24-lead (600-mil) cerdip commercial cy7c292a-25pc p11 24-lead (600-mil) molded dip cy7c292a-25dmb d12 24-lead (600-mil) cerdip military 30 120 cy7c292a-30dmb d12 24-lead (600-mil) cerdip military 35 60 cy7c292al-35pc p11 24-lead (600-mil) molded dip commercial 90 cy7c292a-35dc d12 24-lead (600-mil) cerdip commercial cy7c292a-35pc p11 24-lead (600-mil) molded dip 120 cy7c292a-35dmb d12 24-lead (600-mil) cerdip military 50 60 cy7c292al-50pc p11 24-lead (600-mil) molded dip commercial 90 cy7c292a-50dc d12 24-lead (600-mil) cerdip commercial cy7c292a-50pc p11 24-lead (600-mil) molded dip 120 cy7c292a-50dmb d12 24-lead (600-mil) cerdip military 20 120 cy7c293a-20pc p13 24-lead (300-mil) molded dip commercial cy7c293a-20wc w14 24-lead (300-mil) windowed cerdip 25 120 cy7c293a-25pc p13 24-lead (300-mil) molded dip commercial cy7c293a-25wc w14 24-lead (300-mil) windowed cerdip cy7c293a-25dmb d14 24-lead (300-mil) cerdip military cy7c293a-25lmb l64 28-square leadless chip carrier cy7c293a-25qmb q64 28-pin windowed leadless chip carrier cy7c293a-25wmb w14 24-lead (300-mil) windowed cerdip ordering information [9] (continued) speed (ns) i cc (ma) ordering code package name package type operating range
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 10 of 17 30 120 cy7c293a-30dmb d14 24-lead (300-mil) cerdip military cy7c293a-30lmb l64 28-square leadless chip carrier cy7c293a-30qmb q64 28-pin windowed leadless chip carrier cy7c293a-30wmb w14 24-lead (300-mil) windowed cerdip 35 60 cy7c293al-35pc p13 24-lead (300-mil) molded dip commercial cy7c293al-35wc w14 24-lead (300-mil) windowed cerdip 90 cy7c293a-35pc p13 24-lead (300-mil) molded dip commercial cy7c293a-35wc w14 24-lead (300-mil) windowed cerdip 90 cy7c293a-35dmb d14 24-lead (300-mil) cerdip military cy7c293a-35lmb l64 28-square leadless chip carrier cy7c293a-35qmb q64 28-pin windowed leadless chip carrier cy7c293a-35wmb w14 24-lead (300-mil) windowed cerdip 50 60 cy7c293al-50pc p13 24-lead (300-mil) molded dip commercial cy7c293al-50wc w14 24-lead (300-mil) windowed cerdip 90 cy7c293a-50pc p13 24-lead (300-mil) molded dip commercial cy7c293a-50wc w14 24-lead (300-mil) windowed cerdip 90 cy7c293a-50dmb d14 24-lead (300-mil) cerdip military cy7c293a-50lmb l64 28-square leadless chip carrier cy7c293a-50qmb q64 28-pin windowed leadless chip carrier cy7c293a-50wmb w14 24-lead (300-mil) windowed cerdip ordering information [9] (continued) speed (ns) i cc (ma) ordering code package name package type operating range
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 11 of 17 military specifications group a subgroup testing dc characteristics parameter subgroups v oh 1, 2, 3 v ol 1, 2, 3 v ih 1, 2, 3 v il 1, 2, 3 i ix 1, 2, 3 i oz 1, 2, 3 i cc 1, 2, 3 i sb [10] 1, 2, 3 switching characteristics parameter subgroups t aa 7, 8, 9, 10, 11 t acs1 [11] 7, 8, 9, 10, 11 t acs2 [10] 7, 8, 9, 10, 11 notes: 10. 7c293a only. 11. 7c291a and 7c292a only. smd cross reference smd number suffix cypress number 5962-87650 01kx cy7c291-50tmb 5962-87650 01lx cy7c291-50wmb 5962-87650 013x cy7c291-50qmb 5962-87650 03kx cy7c291-35tmb 5962-87650 03lx cy7c291-35wmb 5962-87650 033x cy7c291-35qmb 5962-88680 01lx cy7c293a-50wmb 5962-88680 01kx cy7c293a-50tmb 5962-88680 013x cy7c293a-50qmb 5962-88680 02lx cy7c293a-35wmb 5962-88680 02kx cy7c293a-35tmb 5962-88680 023x cy7c293a-35qmb 5962-88680 03lx cy7c293a-30wmb 5962-88680 03kx cy7c293a-30tmb 5962-88680 033x cy7c293a-30qmb 5962-88680 04lx cy7c293a-25wmb 5962-88680 04kx cy7c293a-25tmb 5962-88680 043x cy7c293a-25qmb 5962-88734 02jx cy7c292a-45dmb 5962-88734 02kx cy7c291a-45kmb 5962-88734 02lx cy7c291a-45dmb 5962-88734 023x cy7c291a-45lmb 5962-88734 03jx cy7c292a-35dmb 5962-88734 03kx cy7c291a-35kmb 5962-88734 03lx cy7c291a-35dmb 5962-88734 033x cy7c291a-35lmb 5962-88734 04jx cy7c292a-25dmb 5962-88734 04kx cy7c291a-25kmb 5962-88734 04lx cy7c291a-25dmb 5962-88734 043x cy7c291a-25lmb
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 12 of 17 package diagrams 24-lead (600-mil) cerdip d12 mil-std-1835 d-3 config. a 51-80038 24-lead (300-mil) cerdip d14 mil-std-1835 d- 9 config.a 51-80031
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 13 of 17 package diagrams (continued) 28-square leadless chip carrier l64 mil-std-1835 c-4 51-80051 51-85016-a 24-lead (600-mil) molded dip p11
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 14 of 17 package diagrams (continued) 51-85013-a 24-lead (300-mil) molded dip p13/p13a 28-pin windowed leadless chip carrier q64 mil ? std ? 1835 c ? 4 51-80102
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 15 of 17 package diagrams (continued) 24-lead (300-mil) molded soic s13 51-85025-a 24-lead windowed cerpack t73
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 16 of 17 ? cypress semiconductor corporation, 2002. the information contained herein is subject to change without notice. cypress semico nductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress semiconductor product. nor does it convey or imply any license unde r patent or other rights. cypress semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected t o result in significant injury to the user. the inclusion of cypress semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in do i ng so indemnifies cypress semiconductor against all charges. package diagrams (continued) 51-80086 24-lead (300-mil) windowed cerdip w14 mil-std-1835 d-9 config. a
cy7c291a cy7c292a/cy7c293a document #: 38-04011 rev. ** page 17 of 17 document title: cy7c291a cy7c292a cy7c293a 2k x 8 reprogrammable prom document number: 38-04011 rev. ecn no. issue date orig. of change description of change ** 114138 3/18/02 dsg change from spec number: 38-00075 to 38-04011

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