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1998 microchip technology inc. ds11020g-page 1 27lv256 features wide voltage range 3.0v to 5.5v high speed performance - 200 ns access time available at 3.0v cmos technology for low power consumption - 8 ma active current at 3.0v - 20 ma active current at 5.5v - 100 m a standby current factory programming available auto-insertion-compatible plastic packages auto id aids automated programming separate chip enable and output enable controls high speed ?xpress programming algorithm organized 32k x 8: jedec standard pinouts - 28-pin dual-in-line package - 32-pin plcc package - 28-pin soic package - tape and reel data retention > 200 years available for the following temperature ranges: - commercial: 0?c to +70?c - industrial: -40?c to +85?c description the microchip technology inc. 27lv256 is a low volt- age (3.0 volt) cmos eprom designed for battery pow- ered applications. the device is organized as a 32k x 8 (32k-byte) non-volatile memory product. the 27lv256 consumes only 8 ma maximum of active cur- rent during a 3.0 volt read operation therefore improv- ing battery performance. this device is designed for very low voltage applications where conventional 5.0 volt only eproms can not be used. accessing individ- ual bytes from an address transition or from power-up (chip enable pin going low) is accomplished in less than 200 ns at 3.0v. this device allows systems designers the ability to use low voltage non-volatile memory with todays' low voltage microprocessors and peripherals in battery powered applications. a complete family of packages is offered to provide the most ?xibility in applications. for surface mount appli- cations, plcc or soic packaging is available. tape and reel packaging is also available for plcc or soic packages. package types ?1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 v a12 a7 a6 a5 a4 a3 a2 a1 a0 o0 o1 o2 v v a14 a13 a8 a9 a11 oe a10 ce o7 o6 o5 o4 o3 pp ss cc a6 a5 a4 a3 a2 a1 a0 nc o0 a8 a9 a11 nc oe a10 ce o7 o6 a7 a12 v nu vcc a14 a13 o1 o2 v nu o3 o4 o5 pp ss 5 6 7 8 9 10 11 12 13 29 28 27 26 25 24 23 22 21 14 15 16 17 18 19 20 4 3 2 1 32 31 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 v pp a12 a7 a6 a5 a4 a3 a2 a1 a0 o0 o1 o2 v ss v cc a14 a13 a8 a9 a11 oe a10 ce o7 o6 o5 o4 o3 pdip plcc soic 27lv256 27lv256 27lv256 256k (32k x 8) low-voltage cmos eprom
27lv256 ds11020g-page 2 1998 microchip technology inc. 1.0 electrical characteristics 1.1 maxim um ratings* v cc and input voltages w.r.t. v ss ........ -0.6v to +7.25v v pp voltage w.r.t. v ss during programming ......................................... -0.6v to +14v voltage on a9 w.r.t. v ss ....................... -0.6v to +13.5v output voltage w.r.t. v ss .................-0.6v to v cc +1.0v storage temperature .......................... -65?c to +150?c ambient temp. with power applied...... -65?c to +125?c *notice: stresses above those listed under ?aximum ratings may cause permanent damage to the device. this is a stress rat- ing only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this speci?ation is not implied. exposure to maximum rating con- ditions for extended periods may affect device reliability. table 1-1: pin function table name function a0-a14 address inputs ce chip enable oe output enable v pp programming voltage o0 - o7 data output v cc +5v or +3v power supply v ss ground nc no connection; no internal connection nu not used; no external connection is allowed table 1-2: read operation dc characteristics v cc = +5v 10% or 3.0v where indicated commercial: tamb = 0?c to +70?c industrial: tamb = -40?c to +85?c parameter part* status symbol min. max. units conditions input voltages all logic "1" logic "0" v ih v il 2.0 -0.5 v cc +1 0.8 v v input leakage all i li -10 10 m av in = 0 to v cc output voltages all logic "1" logic "0" v oh v ol 2.4 0.45 v v i oh = -400 m a i ol = 2.1 ma output leakage all i lo -10 10 m av out = 0v to v cc input capacitance all c in 6 pf v in = 0v; tamb = 25 c; f = 1 mhz output capacitance all c out ?2 pfv out = 0v; tamb = 25 c; f = 1 mhz power supply current, active c i ttl input ttl input i cc 1 i cc 2 20 @ 5.0v 8 @ 3.0v 25 @ 5.0v 10 @ 3.0v ma ma ma ma v cc = 5.5v; v pp = v cc f = 1 mhz; oe = ce = v il ; i out = 0 ma; v il = -0.1 to 0.8v; v ih = 2.0 to v cc ; note 1 power supply current, standby c i all ttl input ttl input cmos input i cc ( s ) 1 @ 3.0v 2 @ 3.0v 100 @ 3.0v ma ma m ace =v cc 0.2v * parts: c=commercial temperature range i =industrial temperature ranges note 1: typical active current increases .75 ma per mhz up to operating frequency for all temperature ranges.
1998 microchip technology inc. ds11020g-page 3 27lv256 table 1-3: read operation ac characteristics figure 1-1: read waveforms ac testing waveform: v ih = 2.4v and v il = 0.45v; v oh = 2.0v v ol = 0.8v output load: 1 ttl load + 100 pf input rise and fall times: 10 ns ambient temperature: commercial: tamb = 0?c to +70?c industrial: tamb = -40?c to +85?c parameter sym 27hc256-20 27hc256-25 27hc256-30 units conditions min max min max min max address to output delay t acc 200 250 300 ns ce = oe = v il ce to output delay t ce 200 250 300 ns oe = v il oe to output delay t oe 100 125 125 ns ce = v il ce or oe to o/p high impedance t off 0 50 0 50 0 50 ns output hold from address ce or oe , whichever goes ?st t oh 000ns address v ih v il v ih v il v ih v il outputs o0 - o7 v oh v ol address valid t ce(2) t oe(2) high z valid output t acc (1) t off is specified for oe or ce, whichever occurs first (2) oe may be delayed up to t ce - t oe after the falling edge of ce without impact on t ce (3) this parameter is sampled and is not 100% tested. high z t oh t off(1,3) ce oe notes:
27lv256 ds11020g-page 4 1998 microchip technology inc. table 1-4: programming dc characteristics table 1-5: programming ac characteristics ambient temperature: tamb = 25 c 5 c v cc = 6.5v 0.25v, v pp = 13.0v 0.25v parameter status symbol min max. units conditions input voltages logic? logic? v ih v il 2.0 -0.1 v cc +1 0.8 v v input leakage i li -10 10 m av in = 0v to v cc output voltages logic? logic? v oh v ol 2.4 0.45 v v i oh = -400 m a i ol = 2.1 ma v cc current, program & verify i cc 2 20 ma note 1 v pp current, program i pp 2 25 ma note 1 a9 product identi?ation v h 11.5 12.5 v note 1: v cc must be applied simultaneously or before v pp and removed simultaneously or after v pp . for program, program verify ac testing waveform: v ih =2.4v and v il =0.45v; v oh =2.0v; v ol =0.8v and program inhibit modes output load: 1 tll load + 100pf ambient temperature: tamb=25 c 5 c v cc = 6.5v 0.25v, v pp =13.0v 0.25v parameter symbol min. max. units remarks address set-up time t as 2 m s data set-up time t ds 2 m s data hold time t dh 2 m s address hold time t ah 0 m s float delay (2) t df 0 130 ns v cc set-up time t vcs 2 m s program pulse width (1) t pw 95 105 m s 100 m s typical ce set-up time t ces 2 m s oe set-up time t oes 2 m s v pp set-up time t vps 2 m s data valid from oe t oe 100 ns note 1: for express algorithm, initial programming width tolerance is 100 m s 5%. 2: this parameter is only sampled and not 100% tested. output ?at is de?ed as the point where data is no longer driven (see timing diagram).
1998 microchip technology inc. ds11020g-page 5 27lv256 figure 1-2: programming waveforms table 1-6: modes operation mode ce oe v pp a9 o0 - o7 read v il v il v cc xd out program v il v ih v h xd in program verify v ih v il v h xd out program inhibit v ih v ih v h x high z standby v ih xv cc x high z output disable v il v ih v cc x high z identity v il v il v cc v h identity code x = don? care v ih v il v ih v il 13.0v(2) 5.0v 6.5v(2) 5.0v v ih v il v ih v il address data v pp v cc ce oe t df and t oe are characteristics of the device but must be accommodated by the programmer v cc = 6.5v 0.25v, v pp = v h = 13.0v 0.25v for express algorithm t pw t opw t oes address stable t ah t ds t vps t df (1) t dh t oe (1) t as program data stable data out valid verify t vcs notes: (1) (2) high z 1.2 read mode (see timing diagrams and ac characteristics) read mode is accessed when: a) the ce pin is low to power up (enable) the chip b) the oe pin is low to gate the data to the output pins for read operations, if the addresses are stable, the address access time (t acc ) is equal to the delay from ce to output (t ce ). data is transferred to the output after a delay from the falling edge of oe (t oe ).
27lv256 ds11020g-page 6 1998 microchip technology inc. 1.3 standb y mode the standby mode is de?ed when the ce pin is high (v ih ) and a program mode is not de?ed. output dis- able 1.4 output enab le this feature eliminates bus contention in multiple bus microprocessor systems and the outputs go to a high impedance when the following condition is true: the oe pin is high and program mode is not de?ed. 1.5 pr ogramming mode the express algorithm has been developed to improve on the programming throughput times in a production environment. up to 10 100-microsecond pulses are applied until the byte is veri?d. no over-programming is required. a ?wchart of the express algorithm is shown in figure 1. programming takes place when: a) v cc is brought to the proper voltage b) v pp is brought to the proper v h level c) the oe pin is high d) the ce pin is low since the erased state is ? in the array, programming of ? is required. the address to be programmed is set via pins a0-a14 and the data to be programmed is pre- sented to pins o0-o7. when data and address are sta- ble, a low-going pulse on the ce line programs that location. 1.6 v erify after the array has been programmed it must be veri- ?d to ensure that all the bits have been correctly pro- grammed. this mode is entered when all of the following conditions are met: a) v cc is at the proper level b) v pp is at the proper v h level c) the ce pin is high d) the oe line is low 1.7 inhibit when programming multiple devices in parallel with dif- ferent data, only ce needs to be under separate control to each device. by pulsing the ce line low on a partic- ular device, that device will be programmed, and all other devices with ce held high will not be programmed with the data although address and data are available on their input pins. 1.8 identity mode in this mode speci? data is outputted which identi?s the manufacturer as microchip technology inc. and device type. this mode is entered when pin a9 is taken to v h (11.5v to 12.5v). the ce and oe lines must be at v il . a0 is used to access any of the two non-eras- able bytes whose data appears on o0 through o7. pin input output identity a0 0 7 o 6 o 5 o 4 o 3 o 2 o 1 o 0 h e x manufacturer device type* v il v ih 0 1 0 0 1 0 0 0 1 1 0 1 0 0 1 0 29 8c * code subject to change.
1998 microchip technology inc. ds11020g-page 7 27lv256 figure 1-3: programming express algorithm start addr = first location v cc = 6.5v v pp = 13.0v x = 0 program one 100 m s pulse increment x verify byte pass fail x = 10? no yes device failed last address? no increment address conditions: t amb = 25+/-5c v cc = 6.5+/-0.25v v pp = 13.0+/-0.25v yes v cc = v pp = 4.5v, 5.5 v device passed all bytes = original data? device failed no yes
27lv256 ds11020g-page 8 1998 microchip technology inc. notes:
1998 microchip technology inc. ds11020g-page 9 27lv256 notes:
27lv256 ds11020g-page 10 1998 microchip technology inc. notes:
27lv256 27l v256 pr oduct identi cation system to order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory o r the listed sales of?es. package: l = plastic leaded chip carrier p = plastic dip (600 mil) so = plastic soic (300 mil) temperature blank = 0?c to +70?c range: i = -40?c to +85?c access time: 20 = 200 ns 25 = 250 ns 30 = 300 ns (soic only) device: 27lv256 256k (32k x 8) low-voltage cmos eprom 27lv256 25 i /p 1998 microchip technology inc. ds11020g-page 11
? 2002 microchip technology inc. information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warranty is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical com- ponents in life support systems is not authorized except with express written approval by microchip. no licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. trademarks the microchip name and logo, the microchip logo, filterlab, k ee l oq , microid, mplab, pic, picmicro, picmaster, picstart, pro mate, seeval and the embedded control solutions company are registered trademarks of microchip tech- nology incorporated in the u.s.a. and other countries. dspic, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, microport, migratable memory, mpasm, mplib, mplink, mpsim, mxdev, picc, picdem, picdem.net, rfpic, select mode and total endurance are trademarks of microchip technology incorporated in the u.s.a. serialized quick turn programming (sqtp) is a service mark of microchip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2002, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. microchip received qs-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona in july 1999. the company?s quality system processes and procedures are qs-9000 compliant for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms and microperipheral products. in addition, microchip ? s quality system for the design and manufacture of development systems is iso 9001 certified. note the following details of the code protection feature on picmicro ? mcus. the picmicro family meets the specifications contained in the microchip data sheet. microchip believes that its family of picmicro microcontrollers is one of the most secure products of its kind on the market to day, when used in the intended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowl - edge, require using the picmicro microcontroller in a manner outside the operating specifications contained in the data sheet. the person doing so may be engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconductor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ? unbreakable ? . code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our product. if you have any further questions about this matter, please contact the local sales office nearest to you.
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