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final publication# 11407 rev: f amendment/ +2 issue date: july 1997 am27c2048 2 megabit (131,072 x 16-bit) cmos eprom distinctive characteristics n fast access time 55 ns maximum access time n low power consumption 100 m a maximum cmos standby current n jedec-approved pinout plug-in upgrade of 1 mbit eprom 40-pin dip/pdip 44-pin plcc n single +5 v power supply n 10% power supply tolerance standard n 100% flashrite programming typical programming time of 16 seconds n latch-up protected to 100 ma from -1 v to v cc + 1 v n versatile features for simple interfacing both cmos and ttl input/output compatibility two line control functions n high noise immunity general description the am27c2048 is a 2 mbit, ultraviolet erasable program- mable read-only memory. it is organized as 128k words by 16 bits per word, operates from a single +5 v supply, has a static standby mode, and features fast single address loca- tion programming. the am27c2048 is ideal for use in 16-bit microprocessor systems. products are available in win- dowed ceramic dip packages as well as plastic one time programmable (otp) pdip and plcc packages. typically, any byte can be accessed in less than 70 ns, allow- ing operation with high-performance microprocessors without any wait states. the am27c2048 offers separate output enable (oe ) and chip enable (ce ) controls, thus eliminating bus contention in a multiple bus microprocessor system. amds cmos process technology provides high speed, low power, and high noise immunity. typical power consumption is only 125 mw in active mode, and 100 m w in standby mode. all signals are ttl levels, including programming signals. bit locations may be programmed singly, in blocks, or at random. the am27c2048 supports amds flashrite programming al- gorithm (100 m s pulses) resulting in typical programming time of 16 seconds. block diagram 11407f-1 a0?16 address inputs pgm ce oe v cc v ss v pp data outputs dq0?q15 output buffers y gating 2,097,152 bit cell matrix x decoder y decoder output enable chip enable and prog logic
2 am27c2048 product selector guide connection diagrams top view dip plcc notes: 1. jedec nomenclature is in parenthesis. 2. don? use (du) for plcc. pin designations a0?16 = address inputs ce (e ) = chip enable input dq0?q15 = data input/outputs oe (g ) = output enable input pgm (p ) = program enable input v cc =v cc supply voltage v pp = program voltage input v ss = ground logic symbol family part no. am27c2048 ordering part no: v cc = 5.0 v 5% v cc = 5.0 v 10% -55 -255 -55 -70 -90 -120 -150 -200 max access time (ns) 55 70 90 120 150 200 250 ce (e ) access (ns) 55 70 90 120 150 200 250 oe (g ) access (ns) 40 40 40 50 65 75 75 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 v cc pmg (p) nc a15 a14 a13 a12 a11 a10 a9 v ss a8 a7 a6 a5 a4 a3 a2 a1 a0 v pp ce (e) dq15 dq14 dq13 dq12 dq11 dq10 dq9 dq8 v ss dq7 dq6 dq5 dq4 dq3 dq2 dq1 dq0 oe (g) 11407f-2 1 444342 5432 64140 7 8 9 10 11 12 13 14 15 16 17 a13 a12 a11 a10 a9 v ss nc a8 a7 a6 a5 dq13 dq14 dq15 ce ( e ) v pp du (note 2) v cc pmg ( p ) a16 a15 a14 39 38 37 36 35 34 33 32 31 30 29 dq12 dq11 dq10 dq9 dq8 v ss nc dq7 dq6 dq5 dq4 dq3 dq2 dq1 dq0 oe ( g ) du (note 2) a0 a1 a2 a3 a4 23 24 25 26 19 20 21 22 18 27 28 11407f-3 17 16 dq0?q15 a0?16 ce (e ) pmg (p ) oe (g ) 11407f-4
am27c2048 3 ordering information uv eprom products amd standard products are available in several packages and operating ranges. the order number (valid combination) is formed by a combination of: valid combinations valid combinations list con?urations planned to be sup- ported in volume for this device. consult the local amd sales of?e to con?m availability of speci? valid combinations and to check on newly released combinations. temperature range c = commercial (0 c to +70 c) i = industrial (?0 c to +85 c) e = extended (?5 c to +125 c) package type d = 40-pin ceramic dip (cdv040) device number/description am27c2048 2 megabit (131,072 x 16-bit) cmos uv eprom am27c2048 -55 d c optional processing blank = standard processing b = burn-in speed option see product selector guide and valid combinations b 5 voltage tolerance 5=v cc 5%, 55 ns only see product selector guide and valid combinations valid combinations am27c2048-55 v cc = 5.0 v 5% dc5, dc5b, di5, di5b am27c2048-55 v cc = 5.0 v 10% dc, dcb, di, dib am27c2048-70 am27c2048-90 am27c2048-120 dc, dcb, de, deb, di, dib am27c2048-150 am27c2048-200 am27c2048-255 v cc = 5.0 v 5% dc, dcb, di, dib
4 am27c2048 ordering information otp eprom products amd standard products are available in several packages and operating ranges. the order number (valid combination) is formed by a combination of: valid combinations valid combinations list con?urations planned to be sup- ported in volume for this device. consult the local amd sales of?e to con?m availability of speci? valid combinations and to check on newly released combinations. temperature range c = commercial (0 c to +70 c) i = industrial (?0 c to +85 c) package type p = 40-pin plastic dip (pd 040) j = 44-pin square plastic leaded chip carrier (pl 044) device number/description am27c2048 2 megabit (131,072 x 16-bit) cmos otp eprom am27c2048 -55 j c optional processing blank = standard processing speed option see product selector guide and valid combinations voltage tolerance 5=v cc 5%, -55 ns only see product selector guide and valid combinations 5 valid combinations am27c2048-55 v cc = 5.0 v 5% pc5, pi5, jc5, ji5 am27c2048-55 v cc = 5.0 v 10% pc, pi, jc, ji am27c2048-70 am27c2048-90 am27c2048-120 am27c2048-150 am27c2048-200 am27c2048-255 v cc = 5.0 v 5%
am27c2048 5 functional description erasing the am27c2048 in order to clear all locations of their programmed con- tents, it is necessary to expose the am27c2048 to an ultraviolet light source. a dosage of 15 w seconds/cm 2 is required to completely erase an am27c2048. this dosage can be obtained by exposure to an ultraviolet lamp?avelength of 2537 ??ith intensity of 12,000 m w/cm 2 for 15 to 20 minutes. the am27c2048 should be directly under and about one inch from the source and all lters should be removed from the uv light source prior to erasure. it is important to note that the am27c2048, and similar devices, will erase with light sources having wave- lengths shorter than 4000 ?. although erasure times will be much longer than with uv sources at 2537 ?, nevertheless the exposure to ?orescent light and sun- light will eventually erase the am27c2048 and expo- sure to them should be prevented to realize maximum system reliability. if used in such an environment, the package window should be covered by an opaque label or substance. programming the am27c2048 upon delivery, or after each erasure, the am27c2048 has all 2,097,152 bits in the ?ne? or high state. ?eros are loaded into the am27c2048 through the procedure of programming. the programming mode is entered when 12.75 v 0.25 v is applied to the v pp pin, and ce and pgm are at v il . for programming, the data to be programmed is ap- plied 16 bits in parallel to the data pins. the owchart (figure 2) shows amds flashrite algo- rithm. the flashrite algorithm reduces programming time by using 100 m s programming pulse and by giving each address only as many pulses as are necessary in order to reliably program the data. after each pulse is applied to a given address, the data in that address is veri?d. if the data does not verify, additional pulses are given until it veri?s or the maximum is reached. this process is repeated while sequencing through each ad- dress of the am27c2048. this part of the algorithm is done at v cc = 6.25 v to assure that each eprom bit is programmed to a suf?iently high threshold voltage. after the ?al address is completed, the entire eprom memory is veri?d at v cc = v pp = 5.25 v. please refer to section 6 for programming ?w chart and characteristics. program inhibit programming of multiple am27c2048s in parallel with different data is also easily accomplished. except for ce , all like inputs of the parallel am27c2048 may be common. a ttl low-level program pulse applied to an am27c2048 ce input with v pp = 12.75 v 0.25 v and pgm low will program that am27c2048. a high-level ce input inhibits the other am27c2048 devices from being programmed. program verify a verify should be performed on the programmed bits to determine that they were correctly programmed. the verify should be performed with oe and ce , at v il , pgm at v ih , and v pp between 12.5 v and 13.0 v. auto select mode the auto select mode allows the reading out of a binary code from an eprom that will identify its manufacturer and type. this mode is intended for use by program- ming equipment for the purpose of automatically matching the device to be programmed with its corre- sponding programming algorithm. this mode is func- tional in the 25 c 5 c ambient temperature range that is required when programming the am27c2048. to activate this mode, the programming equipment must force 12.0 v 0.5 v on address line a9 of the am27c2048. two identi?r bytes may then be se- quenced from the device outputs by toggling address line a0 from v il to v ih . all other address lines must be held at v il during auto select mode. byte 0 (a0 = v il ) represents the manufacturer code, and byte 1 (a0 = v ih ), the device identi?r code. for the am27c2048, these two identi?r bytes are given in the mode select table. all identi?rs for manufacturer and device codes will possess odd parity, with the msb (dq7) de?ed as the parity bit. read mode the am27c2048 has two control functions, both of which must be logically satis?d in order to obtain data at the outputs. chip enable (ce ) is the power control and should be used for device selection. output enable (oe ) is the output control and should be used to gate data to the output pins, independent of device selec- tion. assuming that addresses are stable, address ac- cess time (t acc ) is equal to the delay from ce to output (t ce ). data is available at the outputs t oe after the fall- ing edge of oe , assuming that ce has been low and addresses have been stable for at least t acc ? oe . standby mode the am27c2048 has a cmos standby mode which re- duces the maximum v cc current to 100 m a. it is placed in cmos-standby when ce is at v cc 0.3 v. the am27c2048 also has a ttl-standby mode which re- duce the maximum v cc current to 1.0 ma. it is placed in ttl-standby when ce is at v ih . when in standby mode, the outputs are in a high-impedance state, inde- pendent of the oe input.
6 am27c2048 output or-tieing to accommodate multiple memory connections, a two-line control function is provided to allow for: n low memory power dissipation, and n assurance that output bus contention will not occur it is recommended that ce be decoded and used as the primary device-selecting function, while oe be made a common connection to all devices in the array and connected to the read line from the system con- trol bus. this assures that all deselected memory de- vices are in their low-power standby mode and that the output pins are only active when data is desired from a particular memory device. system applications during the switch between active and standby condi- tions, transient current peaks are produced on the ris- ing and falling edges of chip enable. the magnitude of these transient current peaks is dependent on the out- put capacitance loading of the device. at a minimum, a 0.1 m f ceramic capacitor (high frequency, low inherent inductance) should be used on each device between v cc and v ss to minimize transient effects. in addition, to overcome the voltage drop caused by the inductive effects of the printed circuit board traces on eprom ar- rays, a 4.7 m f bulk electrolytic capacitor should be used between v cc and v ss for each eight devices. the loca- tion of the capacitor should be close to where the power supply is connected to the array. mode select table notes: 1. v h = 12.0 v 0.5 v. 2. x = either v ih or v il . 3. a1?8 = a10-16 = v il . 4. see dc programming characteristics for v pp voltage during programming. pins mode ce oe pgm a0 a9 v pp outputs read v il v il xxx xd out output disable v il v ih x x x x high z standby (ttl) v ih x x x x x high z standby (cmos) v cc 0.3 v x x x x x high z program v il xv il xxv pp d in program verify v il v il v ih xxv pp d out program inhibit v ih xxxxv pp high z auto select (note 3) manufacturer code v il v il xv il v h x 01h device code v il v il xv ih v h x 98h
am27c2048 7 absolute maximum ratings storage temperature otp products. . . . . . . . . . . . . . . . . . ?5 c to +125 c all other products . . . . . . . . . . . . . . ?5 c to +150 c ambient temperature with power applied. . . . . . . . . . . . . . ?5 c to +125 c voltage with respect to v ss all pins except a9, v pp , v cc . . . .?.6 v to v cc + 0.6 v a9 and v pp (note 2). . . . . . . . . . . . . . ?.6 v to 13.5 v v cc (note 1). . . . . . . . . . . . . . . . . . . . . ?.6 v to 7.0 v notes: 1. minimum dc voltage on input or i/o pins ?.5 v. during voltage transitions, the input may overshoot v ss to ?.0 v for periods of up to 20 ns. maximum dc voltage on input and i/o pins is v cc + 5 v. dur- ing voltage transitions, input and i/o pins may over- shoot to v cc + 2.0 v for periods up to 20ns. 2. minimum dc input voltage on a9 is ?.5 v. during voltage transitions, a9 and v pp may overshoot v ss to ?.0 v for periods of up to 20 ns. a9 and v pp must not exceed+13.5 v at any time. stresses above those listed under ?bsolute maximum rat- ings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the opera- tional sections of this speci?ation is not implied. exposure of the device to absolute maximum ratings for extended periods may affect device reliability. operating ranges commercial (c) devices ambient temperature (t a ). . . . . . . . . . . .0 c to +70 c industrial (i) devices ambient temperature (t a ). . . . . . . . . .?0 c to +85 c extended (e) devices ambient temperature (t a ). . . . . . . . .?5 c to +125 c supply read voltages v cc for am27c2048-55, 255 . . . . +4.75 v to +5.25 v v cc for am27c2048 (all others) . +4.50 v to +5.50 v operating ranges de?e those limits between which the func- tionality of the device is guaranteed.
8 am27c2048 dc characteristics over operating range unless otherwise speci?d (notes 1, 2, and 4) notes: 1. v cc must be applied simultaneously or before v pp , and removed simultaneously or after v pp . 2. caution : the am27c2048 must not be removed from (or inserted into) a socket when v cc or v pp is applied. 3. i cc 1 is tested with oe = v ih to simulate open outputs. 4. minimum dc input voltage is ?.5 v. during transitions, the inputs may overshoot to ?.0 v for periods less than 20 ns. maximum dc voltage on output pins is v cc + 0.5 v, which may overshoot to v cc + 2.0 v for periods less than 20 ns. parameter symbol parameter description test conditions min max unit v oh output high voltage i oh = ?00 m a 2.4 v v ol output low voltage i ol = 2.1 ma 0.45 v v ih input high voltage 2.0 v cc + 0.5 v v il input low voltage -0.5 +0.8 v i li input load current v in = 0 v to v cc c/i devices 1.0 m a e devices 5.0 i lo output leakage current v out = 0 v to v cc 5.0 m a i cc1 v cc active current (note 3) ce = v il , f = 5 mhz, i out = 0 ma c/i devices 50 ma e devices 60 i cc2 v cc ttl standby current ce = v ih 1.0 ma i cc3 v cc cmos standby current ce = v cc 0.3 v 100 m a i pp1 v pp supply current (read) ce = oe = v il , v pp = v cc 100 m a
am27c2048 9 figure 1. typical supply current vs. frequency v cc = 5.5 v, t = 25 c figure 2. typical supply current vs. temperature v cc = 5.5 v, f = 5 mhz capacitance notes: 1. this parameter is only sampled and not 100% tested. 2. t a = +25 c, f = 1 mhz. 11407f-5 12345678910 35 30 25 20 15 frequency in mhz supply current in ma 11407f-6 ?5 ?0 ?5 0 25 50 75 100 125 150 35 30 25 20 15 temperature in c supply current in ma parameter symbol parameter description test conditions cdv040 pd 040 pl 044 unit typ max typ max typ max c in input capacitance v in = 0 10121012 7 10pf c out output capacitance v out = 0 121512151214pf
10 am27c2048 ac characteristics notes: 1. caution: do not remove the am27c2048 from (or insert it into) a socket or board that has v pp or v cc applied. 2. v cc must be applied simultaneously or before v pp , and removed simultaneously or after v pp . 3. this parameter is sampled and not 100% tested. 4. switching characteristics are over operating range, unless otherwise speci?d. 5. test conditions for am27c2048-55: output load: 1 ttl gate and c l = 30 pf input rise and fall times: 20 ns input pulse levels: 0.0 v to 3.0 v timing measurement reference level inputs and outputs: 1.5 v test conditions for all others: output load: 1 ttl gate and c l = 100 pf input rise and fall times: 20 ns input pulse levels: 0.45 v to 2.4 v timing measurement reference level inputs and outputs: 0.8 and 2.0 v parameter symbols description test setup am27c2048 unit jedec standard -55 -70 -90 -120 -150 -200 -255 t avqv t acc address to output delay ce , oe = v il max 55 70 90 120 150 200 250 ns t elqv t ce chip enable to output delay oe = v il max 55 70 90 120 150 200 250 ns t glqv t oe output enable to output delay ce = v il max 40 40 40 50 65 75 75 ns t ehqz t ghqz t df (note 3) chip enable to output high z or output enable to output high z to output float, whichever occurs first max 25 25 25 30 30 40 60 ns t axqx t oh output hold time from addresses, ce or oe , whichever occurs first min0000000ns
am27c2048 11 switching test circuit switching test waveform 2.7 k w diodes = in3064 or equivalent c l 6.2 k w 5.0 v in3064 or equivalent notes: for -55: c l = 30 pf including jig capacitance for all others: c l = 100 pf including jig capacitance device under test 11407f-7 2.4 v 0.45 v input output test points 2.0 v 2.0 v 0.8 v 0.8 v 11407f-8 3 v 0 v input output 1.5 v 1.5 v test points ac testing (except for -55 devices): inputs are driven at 2.4 v for a logic ? and 0.45 v for a logic ?? input pulse rise and fall times are 20 ns. ac testing for -55 devices: inputs are driven at 3.0 v for a logic ? and 0 v for a logic ?? input pulse rise and fall times are 20 ns.
12 am27c2048 key to switching waveforms switching waveforms trademarks copyright ?1997 advanced micro devices, inc. all rights reserved. amd, the amd logo, and combinations thereof are trademarks of advanced micro devices, inc. flashrite is a trademark of advanced micro devices, inc. product names used in this publication are for identi?ation purposes only and may be trademarks of their respective companies. must be steady may change from h to l may change from l to h does not apply don? care, any change permitted will be steady will be changing from h to l will be changing from l to h changing, state unknown center line is high- impedance ?ff state waveform inputs outputs ks000010-pal addresses ce oe output 11407f-9 addresses valid high z high z t ce valid output 2.4 0.45 2.0 0.8 2.0 0.8 t acc (note 1) t oe t df (note 2) t oh
am27c2048 13 revision summary for am27c2048 distinctive characteristics: the fastest speed grade available is now 55 ns. product selector guide: added 55 ns column. ordering information, uv eprom products: the 55 ns part number is now listed in the example. the nomenclature now has a method of clearly desig- nating the voltage operating range and speed grade. ordering information, otp eprom products: changed the part number example from -70 to -55. the nomenclature now has a method of clearly designating the voltage operating range and speed grade. valid combinations: added the 55 ns speed grade to the table. operating ranges: changed supply read voltages listings to match those in the product selector guide. ac characteristics: added column for 55 ns speed grade, rearranged notes, moved text from table title to note 4, renamed table. switching test circuit: added 55 ns to the c l note on 30 pf test condition. switching test waveform: added the 3 v test waveform.

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