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1 features ? fast 5v read access time - 35 ns ? command table architecture C internal program control and timer ? 12v program and erase C fast chip erase time - 0.5 second maximum C word-by-word programming - 20 s/word typical ? hardware data protection ? low-power cmos operation C 100 a maximum standby C 30 ma maximum active at 5 mhz ? jedec standard packages C 44-lead plcc C 40-lead vsop (10 mm x 14 mm) ? pin-compatible with atmels at27c1024 and at49f1024/1025 ? high-reliability cmos technology C 2000v esd protection C 200 ma latchup immunity ? cmos and ttl compatible inputs and outputs ? 100 write cycles guaranteed description the AT27RW1024 is a low-power, high-performance 1,048,576-bit electrically- rewriteable programmable read-only memory (rwprom) organized 64k x 16 bits. it requires only one 5v power supply in normal read mode operation. any word can be accessed in less than 35 ns, eliminating the need for speed reducing wait states. rev. 1415aC06/99 1-megabit (64k x 16) rewriteable prom AT27RW1024 pin configurations pin name function a0 - a15 addresses ce chip enable oe output enable we write enable i/o0 - i/o15 data inputs/outputs nc no connect vsop type 1 10 x 14 mm 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 a9 a10 a11 a12 a13 a14 a15 nc we vcc vpp ce i/o15 i/o14 i/o13 i/o12 i/o11 i/o10 i/o9 i/o8 gnd a8 a7 a6 a5 a4 a3 a2 a1 a0 oe i/o0 i/o1 i/o2 i/o3 i/o4 i/o5 i/o6 i/o7 gnd plcc top view 7 8 9 10 11 12 13 14 15 16 17 39 38 37 36 35 34 33 32 31 30 29 i/o12 i/o11 i/o10 i/o9 i/o8 gnd nc i/o7 i/o6 i/o5 i/o4 a13 a12 a11 a10 a9 gnd nc a8 a7 a6 a5 6 5 4 3 2 1 44 43 42 41 40 18 19 20 21 22 23 24 25 26 27 28 i/o3 i/o2 i/o1 i/o0 oe nc a0 a1 a2 a3 a4 i/o13 i/o14 i/o15 ce vpp nc vcc we nc a15 a14 (continued)
AT27RW1024 2 the x16 organization makes this part ideal for high- performance 16- and 32-bit dsp and microprocessor systems. the AT27RW1024 is pin-compatible with atmels at49f1024/1025 and at27c1024. in read mode, the AT27RW1024 typically consumes 15 ma. standby mode supply current is typically less than 10 a. reprogramming the AT27RW1024 is performed by erasing the entire chip and then programming on a word-by-word basis. the program and erase functions are performed with v cc = 5v and v pp = 12v. programming time is 20 s per word typi- cal. 100 program and erase cycles are guaranteed. block diagram device operation read: when ce and oe are low and we is high, the data stored at the memory location determined by the address pins is asserted on the outputs. the outputs are put in the high impedance state whenever ce or oe is high. this dual-line control gives designers flexibility in preventing bus contention. chip erase: the chip erase will erase all words to an ffffh. the chip erase command is a six bus cycle opera- tion. the address (5555h) is latched on the falling edge of the sixth cycle while the 10h data input is latched on the rising edge of we . the chip erase starts after the rising edge of we of the sixth cycle. please see chip erase cycle waveforms on page 7. the chip erase operation is internally controlled; it will automatically time to completion. after a chip erase, the device will return to the read mode. chip erase requires v cc = 5v and v pp = 12v. word programming: once the memory array is erased, the device is programmed (to a logical 0) on a word-by-word basis. please note that a data 0 cannot be programmed back to a 1; only erase operations can convert 0s to 1s. programming is accomplished via the internal device command register and is a 4 bus cycle operation (please refer to the command definitions table). the device will automatically generate the required internal program pulses. the program cycle has addresses latched on the falling edge of we or ce , whichever occurs last, and the data latched on the rising edge of we or ce , whichever occurs first. programming is completed after the specified t bp cycle time. programming requires v pp = 12v and v cc = 5v. product identification: the product identification mode identifies the device and manufacturer as atmel. it may be accessed by hardware or software operation. the hardware operation mode can be used by an external pro- grammer to identify the correct programming algorithm for the atmel product. for details, see operating modes (for hardware operation) or software product identification. the manufacturer and device code is the same for both modes. hardware data protection: hardware features protect against inadvertent programs to the AT27RW1024 in the following ways: (a) v cc sense: if v cc is below 3.8v (typical), the program function is inhibited. (b) program inhibit: holding any one of oe low, ce high or we high inhibits program cycles. (c) noise filter: pulses of less than 15 ns (typical) on the we or ce inputs will not initiate a program cycle. oe, ce, and we logic y decoder x decoder input/output buffers data latch y-gating main memory (64k words) oe we ce address inputs vcc gnd data inputs/outputs i/o15 - i/o0 16
AT27RW1024 3 note: the data format in each bus cycle is as follows: i/o15 - i/o8 (dont care); i/o7 - i/o0 (hex). command definition (in hex) command sequence bus cycles 1st bus cycle 2nd bus cycle 3rd bus cycle 4th bus cycle 5th bus cycle 6th bus cycle addr data addr data addr data addr data addr data addr data read 1 addr d out chip erase 6 5555 aa 2aaa 55 5555 80 5555 aa 2aaa 55 5555 10 word program 4 5555 aa 2aaa 55 5555 a0 addr d in product id entry 3 5555 aa 2aaa 55 5555 90 product id exit 1 xxxx f0 absolute maximum ratings* temperature under bias................................ -55c to +125c *notice: stresses beyond those listed under absolute maximum ratings may cause permanent dam- age to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. storage temperature ..................................... -65c to +150c all input voltages (including nc pins) with respect to ground ...................................-0.6v to +6.25v all output voltages with respect to ground .............................-0.6v to v cc + 0.6v voltage on oe with respect to ground ...................................-0.6v to +13.5v
AT27RW1024 4 notes: 1. x can be v il or v ih . 2. refer to ac programming and erasing waveforms. 3. v h = 12.0v 0.5v. 4. x can be v cc or v pp . 5. see details under software product identification entry/exit. 6. manufacturer code: 001eh, device code: 0051h. 7. for customers building field-upgradable systems, x can be 12.0v. dc and ac operating range AT27RW1024-35 AT27RW1024-45 AT27RW1024-55 AT27RW1024-70 operating temperature (case) com. 0c - 70c 0c - 70c 0c - 70c 0c - 70c ind. -40c - 85c -40c - 85c -40c - 85c -40c - 85c v cc power supply 5v 10% 5v 10% 5v 10% 5v 10% operating modes mode ce oe we v pp ai i/o read v il v il v ih x (1)(7) ai d out program/erase (2) v il v ih v il v pp ai d in /x standby v ih x (1) x (1) x (1)(7) x (1) high z program/erase inhibit v il v ih v il x (1)(7) x (1) x (1) x (1) v ih v pp x (1) program/erase verify x (1) v il x (1) v pp ai d out output disable x (1) v ih x (1) x (1)(7) high z product identification hardware v il v il v ih x (4) a1 - a15 = v il , a9 = v h , (3) a0 = v il manufacturer code (6) x (4) a1 - a15 = v il , a9 = v h , (3) a0 = v ih device code (6) software (5) x (4) a0 = v il , a1 - a15 = v il manufacturer code (6) x (4) a0 = v ih , a1 - a15 = v il device code (6) dc characteristics symbol parameter condition min max units i li input load current v in = 0v to v cc 10 a i lo output leakage current v i/o = 0v to v cc 10 a i sb1 v cc standby current cmos ce = v cc - 0.3v to v cc 100 a i sb2 v cc standby current ttl ce = 2.0v to v cc 1ma i cc v cc active current f = 5 mhz; i out = 0 ma 30 ma i pp program or erase current word program, chip erase in progress 25 ma v il input low voltage 0.8 v v ih input high voltage 2.0 v v ol output low voltage i ol = 2.1 ma 0.45 v v oh1 output high voltage i oh = -400 a 2.4 v
AT27RW1024 5 ac read waveforms (1)(2)(3)(4) notes: 1. ce may be delayed up to t acc - t ce after the address transition without impact on t acc . 2. oe may be delayed up to t ce - t oe after the falling edge of ce without impact on t ce or by t acc - t oe after an address change without impact on t acc . 3. t df is specified from oe or ce whichever occurs first (c l = 5 pf). 4. this parameter is characterized and is not 100% tested. input test waveforms and measurement level t r , t f < 5 ns output test load note: 1. this parameter is characterized and is not 100% tested. ac read characteristics symbol parameter AT27RW1024-35 AT27RW1024-45 AT27RW1024-55 AT27RW1024-70 units minmaxminmaxminmaxminmax t acc address to output delay 35 45 55 70 ns t ce (1) ce to output delay 35 45 55 70 ns t oe (2) oe to output delay 0 15 18 25 25 ns t df (3)(4) ce or oe to output float 0 15 18 0 25 25 ns t oh output hold from oe , ce or address, whichever occurred first 7777 ns output pin 5.0v 30 pf 1.8k 1.3k pin capacitance f = 1 mhz, t = 25c (1) symbol typ max units conditions c in 46pfv in = 0v c out 812pfv out = 0v
AT27RW1024 6 ac word load waveforms we controlled ce controlled ac word load characteristics symbol parameter min max units t as , t oes address, oe set-up time 0 ns t ah address hold time 50 ns t cs chip select set-up time 0 ns t ch chip select hold time 0 ns t wp write pulse width (we or ce )90ns t ds data set-up time 50 ns t dh , t oeh data, oe hold time 0 ns t wph write pulse width high 90 ns t dh t ds t as t ah t wp ce address data in oe t oes t oeh we t cs t ch t wph t dh t ds t as t ah t wp we address data in oe t oes t oeh ce t cs t ch t wph
AT27RW1024 7 program cycle waveforms chip erase cycle waveforms notes: 1. oe must be high only when we and ce are both low. program cycle characteristics symbol parameter min typ max units t bp word programming time 20 50 s t as address set-up time 0 ns t ah address hold time 50 ns t ds data set-up time 50 ns t dh data hold time 0 ns t wp write pulse width 90 ns t wph write pulse width high 90 ns t ec erase cycle time 500 ms a0-a15 oe aa 80 10h 55 55 5555 5555 5555 aa word 0 word 1 word 2 word 3 word 4 word 5 2aaa 2aaa t wph t wp ce we a0-a15 data t as t ah t ec t dh t ds 5555
AT27RW1024 8 software product identification entry (1) software product identification exit (1) notes: 1. data format: i/o15 - i/o8 (dont care); i/o7 - i/o0 (hex); address format: a14 - a0 (hex). 2. a1 - a15 = v il . manufacture code is read for a0 = v il ; device code is read for a0 = v ih . 3. the device does not remain in identification mode if powered down. 4. the device returns to standard operation mode. 5. manufacturer code: 001eh device code: 0051h load data aa to address 5555 load data 55 to address 2aaa load data 90 to address 5555 enter product identification mode (2)(3)(5) load data f0 to any address exit product identification mode (4)
AT27RW1024 9 ordering information t acc (ns) i cc (ma) ordering code package operation range active standby 35 30 0.1 AT27RW1024-35jc AT27RW1024-35vc 44j 40v commercial (0 to 70 c) 30 0.1 AT27RW1024-35ji AT27RW1024-35vi 44j 40v industrial (-40 to 85 c) 45 30 0.1 AT27RW1024-45jc AT27RW1024-45vc 44j 40v commercial (0 to 70 c) 30 0.1 AT27RW1024-45ji AT27RW1024-45vi 44j 40v industrial (-40 to 85 c) 55 30 0.1 AT27RW1024-55jc AT27RW1024-55vc 44j 40v commercial (0 to 70 c) 30 0.1 AT27RW1024-55ji AT27RW1024-55vi 44j 40v industrial (-40 to 85 c) 70 30 0.1 AT27RW1024-70jc AT27RW1024-70vc 44j 40v commercial (0 to 70 c) 30 0.1 AT27RW1024-70ji AT27RW1024-70vi 44j 40v industrial (-40 to 85 c) package type 44j 44-lead, plastic j-leaded chip carrier (plcc) 40v 40-lead, thin small outline package (vsop) (10 mm x 14 mm)
AT27RW1024 10 packaging information *controlling dimension: millimeters .045(1.14) x 45 pin no. 1 identify .045(1.14) x 30 - 45 .012(.305) .008(.203) .021(.533) .013(.330) .630(16.0) .590(15.0) .043(1.09) .020(.508) .120(3.05) .090(2.29) .180(4.57) .165(4.19) .500(12.7) ref sq .032(.813) .026(.660) .050(1.27) typ .022(.559) x 45 max (3x) .656(16.7) .650(16.5) .695(17.7) .685(17.4) sq sq *controlling dimension: millimeters 44j , 44-lead, plastic j-leaded chip carrier (plcc) dimensions in inches and (millimeters)* jedec standard ms-018 ac 40v , 40-lead, plastic thin small outline package (vsop) dimensions in millimeters and (inches)*
? atmel corporation 1999. atmel corporation makes no warranty for the use of its products, other than those expressly contained in the companys standard war- ranty which is detailed in atmels terms and conditions located on the companys web site. the company assumes no responsibilit y for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any tim e without notice, and does not make any commitment to update the information contained herein. no licenses to patents or other intellectu al prop- erty of atmel are granted by the company in connection with the sale of atmel products, expressly or by implication. atmels pr oducts are not authorized for use as critical components in life support devices or systems. atmel headquarters atmel operations corporate headquarters 2325 orchard parkway san jose, ca 95131 tel (408) 441-0311 fax (408) 487-2600 europe atmel u.k., ltd. coliseum business centre riverside way camberley, surrey gu15 3yl england tel (44) 1276-686-677 fax (44) 1276-686-697 asia atmel asia, ltd. room 1219 chinachem golden plaza 77 mody road tsimhatsui east kowloon hong kong tel (852) 2721-9778 fax (852) 2722-1369 japan atmel japan k.k. 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel (81) 3-3523-3551 fax (81) 3-3523-7581 atmel colorado springs 1150 e. cheyenne mtn. blvd. colorado springs, co 80906 tel (719) 576-3300 fax (719) 540-1759 atmel rousset zone industrielle 13106 rousset cedex france tel (33) 4-4253-6000 fax (33) 4-4253-6001 fax-on-demand north america: 1-(800) 292-8635 international: 1-(408) 441-0732 e-mail literature@atmel.com web site http://www.atmel.com bbs 1-(408) 436-4309 printed on recycled paper. 1415aC06/99/xm marks bearing ? and/or ? are registered trademarks and trademarks of atmel corporation. terms and product names in this document may be trademarks of others.

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