27LV K (32K x 8) Low-Voltage CMOS EPROM FEATURES PACKAGE TYPES DESCRIPTION PDIP

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1 256K (32K x 8) Low-oltage CMS EPRM FEATURES Wide voltage range 3. to 5.5 High speed performance - 2 ns access time available at 3. CMS Technology for low power consumption - 8 ma Active current at ma Active current at µa Standby current Factory programming available Auto-insertion-compatible plastic packages Auto ID aids automated programming Separate chip enable and output enable controls High speed Express programming algorithm rganized 32K x 8: JEDEC standard pinouts - 28-pin Dual-in-line package - 32-pin PLCC package - 28-pin SIC package - Tape and reel Data Retention > 2 years Available for the following temperature ranges: - Commercial: C to +7 C - Industrial: -4 C to +85 C DESCRIPTIN The Microchip Technology Inc. 27L256 is a low voltage (3. volt) CMS EPRM designed for battery powered applications. The device is organized as a 32K x 8 (32K-Byte) non-volatile memory product. The 27L256 consumes only 8 ma maximum of active current during a 3. volt read operation therefore improving battery performance. This device is designed for very low voltage applications where conventional 5. volt only EPRMS can not be used. Accessing individual bytes from an address transition or from power-up (chip enable pin going low) is accomplished in less than 2 ns at 3.. This device allows systems designers the ability to use low voltage non-volatile memory with today s' low voltage microprocessors and peripherals in battery powered applications. A complete family of packages is offered to provide the most flexibility in applications. For surface mount applications, PLCC or SIC packaging is available. Tape and reel packaging is also available for PLCC or SIC packages. PACKAGE TYPES PDIP PLCC SIC PP A2 A7 A6 A5 A4 A3 A2 A A 2 SS A6 5 A5 6 A4 7 A3 8 A2 9 A A NC 2 3 PP A2 A7 A6 A5 A4 A3 A2 A A 2 SS A7 A2 PP NU SS NU cc A4 A L256 27L256 27L CC A4 A3 A8 A9 A E A CE A8 28 A9 27 A 26 NC 25 E 24 A 23 CE CC A4 A3 A8 A9 A E A CE Microchip Technology Inc. DS2G-page

2 . ELECTRICAL CHARACTERISTICS. Maximum Ratings* CC and input voltages w.r.t. SS to PP voltage w.r.t. SS during programming to +4 oltage on A9 w.r.t. SS to +3.5 utput voltage w.r.t. SS to CC +. Storage temperature C to +5 C Ambient temp. with power applied C to +25 C *Notice: Stresses above those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. TABLE -: Name A-A4 CE E PP - 7 CC SS NC NU PIN FUNCTIN TABLE Address Inputs Chip Enable utput Enable Function Programming oltage Data utput +5 or +3 Power Supply Ground No Connection; No Internal Connection Not Used; No External Connection Is Allowed TABLE -2: READ PERATIN DC CHARACTERISTICS CC = +5 ±% or 3. where indicated Commercial: Tamb = C to +7 C Industrial: Tamb = -4 C to +85 C Parameter Part* Status Symbol Min. Max. Units Conditions Input oltages all Logic "" Logic "" CC+.8 Input Leakage all ILI - µa IN = to CC utput oltages all Logic "" H 2.4 IH = -4 µa Logic "" L.45 IL = 2. ma utput Leakage all IL - µa UT = to CC Input Capacitance all CIN 6 pf IN = ; Tamb = 25 C; f = MHz utput Capacitance all CUT 2 pf UT = ; Tamb = 25 C; f = MHz Power Supply Current, Active Power Supply Current, Standby C I C I all TTL input TTL input TTL input TTL input CMS input ICC ICC ma ma ma ma CC = 5.5; PP = CC f = MHz; E = CE = ; IUT = ma; = -. to.8; = 2. to CC; Note ma ma µa CE=CC ±.2 * Parts: C=Commercial Temperature Range I =Industrial Temperature Ranges Note : Typical active current increases.75 ma per MHz up to operating frequency for all temperature ranges. DS2G-page Microchip Technology Inc.

3 TABLE -3: READ PERATIN AC CHARACTERISTICS AC Testing Waveform: = 2.4 and =.45; H = 2. L =.8 utput Load: TTL Load + pf Input Rise and Fall Times: ns Ambient Temperature: Commercial: Tamb = C to +7 C Industrial: Tamb = -4 C to +85 C Parameter Sym 27HC HC HC256-3 Min Max Min Max Min Max Units Conditions Address to utput Delay tacc ns CE = E = CE to utput Delay tce ns E = E to utput Delay te ns CE = CE or E to /P High Impedance utput Hold from Address CE or E, whichever goes first tff ns th ns FIGURE -: READ WAEFRMS Address Address valid CE tce(2) E te(2) th tff(,3) utputs - 7 H L High Z alid utput High Z tacc Notes: () tff is specified for E or CE, whichever occurs first (2) E may be delayed up to tce - te after the falling edge of CE without impact on tce (3) This parameter is sampled and is not % tested. 998 Microchip Technology Inc. DS2G-page 3

4 TABLE -4: PRGRAMMING DC CHARACTERISTICS Ambient Temperature: Tamb = 25 C ± 5 C CC = 6.5 ±.25, PP = 3. ±.25 Parameter Status Symbol Min Max. Units Conditions Input oltages Logic Logic CC+.8 Input Leakage ILI - µa IN = to CC utput oltages Logic Logic CC Current, program & verify ICC2 2 ma Note PP Current, program IPP2 25 ma Note H L A9 Product Identification H Note : IH = -4 µa IL = 2. ma CC must be applied simultaneously or before PP and removed simultaneously or after PP. TABLE -5: PRGRAMMING AC CHARACTERISTICS for Program, Program erify AC Testing Waveform: =2.4 and =.45; H=2.; L=.8 and Program Inhibit Modes utput Load: TLL Load + pf Ambient Temperature: Tamb=25 C±5 C CC= 6.5 ±.25, PP =3. ±.25 Parameter Symbol Min. Max. Units Remarks Address Set-Up Time tas 2 µs Data Set-Up Time tds 2 µs Data Hold Time tdh 2 µs Address Hold Time tah µs Float Delay (2) tdf 3 ns CC Set-Up Time tcs 2 µs Program Pulse Width () tpw 95 5 µs µs typical CE Set-Up Time tces 2 µs E Set-Up Time tes 2 µs PP Set-Up Time tps 2 µs Data alid from E te ns Note : For express algorithm, initial programming width tolerance is µs ±5%. 2: This parameter is only sampled and not % tested. utput float is defined as the point where data is no longer driven (see timing diagram). DS2G-page Microchip Technology Inc.

5 FIGURE -2: PRGRAMMING WAEFRMS Program erify Address Address Stable Data tas Data Stable High Z Data ut alid tah tds tdh tdf () PP 3.(2) 5. tps CC 6.5(2) 5. tcs CE E tpw tpw tes te () Notes: () (2) tdf and te are characteristics of the device but must be accommodated by the programmer CC = 6.5 ±.25, PP = H = 3. ±.25 for express algorithm TABLE -6: MDES peration Mode CE E PP A9-7 Read CC X DUT Program H X DIN Program erify H X DUT Program Inhibit H X High Z Standby X CC X High Z utput Disable CC X High Z Identity CC H Identity Code X = Don t Care.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 E pin is low to gate the data to the output pins For Read operations, if the addresses are stable, the address access time (tacc) is equal to the delay from CE to output (tce). Data is transferred to the output after a delay from the falling edge of E (te). 998 Microchip Technology Inc. DS2G-page 5

6 .3 Standby Mode The standby mode is defined when the CE pin is high () and a program mode is not defined. utput Disable.4 utput Enable 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 E pin is high and program mode is not defined..5 Programming Mode The Express algorithm has been developed to improve on the programming throughput times in a production environment. Up to -microsecond pulses are applied until the byte is verified. No over-programming is required. A flowchart of the express algorithm is shown in Figure. Programming takes place when: a) CC is brought to the proper voltage b) PP is brought to the proper H level c) the E 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 A-A4 and the data to be programmed is presented to pins -7. When data and address are stable, a low-going pulse on the CE line programs that location..6 erify After the array has been programmed it must be verified to ensure that all the bits have been correctly programmed. This mode is entered when all of the following conditions are met: a) CC is at the proper level b) PP is at the proper H level c) the CE pin is high d) the E line is low.7 Inhibit When Programming multiple devices in parallel with different data, only CE needs to be under separate control to each device. By pulsing the CE line low on a particular 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..8 Identity Mode In this mode specific data is outputted which identifies the manufacturer as Microchip Technology Inc. and device type. This mode is entered when Pin A9 is taken to H (.5 to 2.5). The CE and E lines must be at. A is used to access any of the two non-erasable bytes whose data appears on through 7. Pin Input utput Identity Manufacturer Device Type* A 7 * Code subject to change H e x 29 8C DS2G-page Microchip Technology Inc.

7 FIGURE -3: PRGRAMMING EXPRESS ALGRITHM Conditions: Tamb = 25+/-5C CC = 6.5+/-.25 PP = 3.+/-.25 Start ADDR = First Location CC = 6.5 PP = 3. X = Program one µs pulse Increment X erify Byte Pass Fail No Yes Device X =? Failed Last Address? Yes No Increment Address CC = PP = 4.5, 5.5 Device Passed Yes All bytes = original data? No Device Failed 998 Microchip Technology Inc. DS2G-page 7

8 NTES: DS2G-page Microchip Technology Inc.

9 NTES: 998 Microchip Technology Inc. DS2G-page 9

10 NTES: DS2G-page 998 Microchip Technology Inc.

11 27L256 Product Identification System To order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory or the listed sales offices. 27L I /P Package: L = Plastic Leaded Chip Carrier P = Plastic DIP (6 Mil) S = Plastic SIC (3 Mil) Temperature Blank = C to +7 C Range: I = -4 C to +85 C Access Time: 2 = 2 ns 25 = 25 ns 3 = 3 ns (SIC only) Device: 27L K (32K x 8) Low-oltage CMS EPRM 998 Microchip Technology Inc. DS2G-page

Note the following details of the code protection feature on PICmicro MCUs. The PICmicro family meets the specifications contained in the Microchip Data Sheet.

12 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 today, 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 knowledge, 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. 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 components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELQ, microid, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PR MATE, SEEAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dspic, ECNMNITR, FanSense, FlexRM, fuzzylab, In-Circuit Serial Programming, ICSP, ICEPIC, microport, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDE, 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. 22, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 999. The Company s quality system processes and procedures are QS-9 compliant for its PICmicro 8-bit MCUs, KEELQ code hopping devices, Serial EEPRMs and microperipheral products. In addition, Microchip s quality system for the design and manufacture of development systems is IS 9 certified. 22 Microchip Technology Inc.

13 M WRLDWIDE SALES AND SERICE AMERICAS Corporate ffice 2355 West Chandler Blvd. Chandler, AZ Tel: Fax: Technical Support: Web Address: Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ Tel: Fax: Atlanta 5 Sugar Mill Road, Suite 2B Atlanta, GA 335 Tel: Fax: Boston 2 Lan Drive, Suite 2 Westford, MA 886 Tel: Fax: Chicago 333 Pierce Road, Suite 8 Itasca, IL 643 Tel: Fax: Dallas 457 Westgrove Drive, Suite 6 Addison, TX 75 Tel: Fax: Detroit Tri-Atria ffice Building Northwestern Highway, Suite 9 Farmington Hills, MI Tel: Fax: Kokomo 2767 S. Albright Road Kokomo, Indiana 4692 Tel: Fax: Los Angeles 82 on Karman, Suite 9 Irvine, CA 9262 Tel: Fax: New York 5 Motor Parkway, Suite 22 Hauppauge, NY 788 Tel: Fax: San Jose Microchip Technology Inc. 27 North First Street, Suite 59 San Jose, CA 953 Tel: Fax: Toronto 6285 Northam Drive, Suite 8 Mississauga, ntario L4 X5, Canada Tel: Fax: ASIA/PACIFIC Australia Microchip Technology Australia Pty Ltd Suite 22, 4 Rawson Street Epping 22, NSW Australia Tel: Fax: China - Beijing Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison ffice Unit 95 Bei Hai Wan Tai Bldg. No. 6 Chaoyangmen Beidajie Beijing, 27, No. China Tel: Fax: China - Chengdu Microchip Technology Consulting (Shanghai) Co., Ltd., Chengdu Liaison ffice Rm. 24, 24th Floor, Ming Xing Financial Tower No. 88 TIDU Street Chengdu 66, China Tel: Fax: China - Fuzhou Microchip Technology Consulting (Shanghai) Co., Ltd., Fuzhou Liaison ffice Unit 28F, World Trade Plaza No. 7 Wusi Road Fuzhou 35, China Tel: Fax: China - Shanghai Microchip Technology Consulting (Shanghai) Co., Ltd. Room 7, Bldg. B Far East International Plaza No. 37 Xian Xia Road Shanghai, 25 Tel: Fax: China - Shenzhen Microchip Technology Consulting (Shanghai) Co., Ltd., Shenzhen Liaison ffice Rm. 35, 3/F, Shenzhen Kerry Centre, Renminnan Lu Shenzhen 58, China Tel: Fax: Hong Kong Microchip Technology Hongkong Ltd. Unit 9-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: Fax: India Microchip Technology Inc. India Liaison ffice Divyasree Chambers Floor, Wing A (A3/A4) No., Shaugnessey Road Bangalore, 56 25, India Tel: Fax: Japan Microchip Technology Japan K.K. Benex S- 6F 3-8-2, Shinyokohama Kohoku-Ku, Yokohama-shi Kanagawa, , Japan Tel: Fax: Korea Microchip Technology Korea 68-, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea Tel: Fax: Singapore Microchip Technology Singapore Pte Ltd. 2 Middle Road #7-2 Prime Centre Singapore, 8898 Tel: Fax: Taiwan Microchip Technology Taiwan F-3, No. 27 Tung Hua North Road Taipei, 5, Taiwan Tel: Fax: EURPE Denmark Microchip Technology Nordic ApS Regus Business Centre Lautrup hoj -3 Ballerup DK-275 Denmark Tel: Fax: France Microchip Technology SARL Parc d Activite du Moulin de Massy 43 Rue du Saule Trapu Batiment A - ler Etage 93 Massy, France Tel: Fax: Germany Microchip Technology GmbH Gustav-Heinemann Ring 25 D-8739 Munich, Germany Tel: Fax: Italy Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus. Le Colleoni 24 Agrate Brianza Milan, Italy Tel: Fax: United Kingdom Arizona Microchip Technology Ltd. 55 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG4 5TU Tel: Fax: /8/2 22 Microchip Technology Inc.

27C K (32K x 8) CMOS EPROM FEATURES PACKAGE TYPES DESCRIPTION

27C K (32K x 8) CMOS EPROM FEATURES PACKAGE TYPES DESCRIPTION 256K (32K x 8) CMS EPRM 27C256 FEATURES PACKAGE TYPES High speed performance - 9 ns access time available CMS Technology for low power consumption - 2 ma Active current - µa Standby current Factory programming