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Obsolete Device
27C512A
512K (64K x 8) CMOS EPROM
FEATURES
* High speed performance * CMOS Technology for low power consumption - 25 mA Active current - 30 A Standby current * Factory programming available * Auto-insertion-compatible plastic packages * Auto ID aids automated programming * High speed express programming algorithm * Organized 64K 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: 0C to +70C - Industrial: -40C to +85C - Automotive: -40C to +125C
PACKAGE TYPES
A7 A12 A15 NU Vcc A14 A13
32 31
PLCC
A6 A5 A4 A3 A2 A1 A0 NC O0
5 6
30
4
3
2
1
29 28
8 9 10 11 12 13 14 15
27C512A
7
27 26 25 24 23 22 21
A8 A9 A11 NC OE/VPP A10 CE O7 O6
16
17
18
19
DIP/SOIC
A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 O0 O1 O2 VSS
O1 O2 VSS NU O3 O4 O5
DESCRIPTION
The Microchip Technology Inc. 27C512A is a CMOS 512K bit electrically Programmable Read Only Memory (EPROM). The device is organized into 64K words by 8 bits (64K bytes). Accessing individual bytes from an address transition or from power-up (chip enable pin going low) is accomplished in less than 90 ns. This very high speed device allows the most sophisticated microprocessors to run at full speed without the need for WAIT states. CMOS design and processing enables this part to be used in systems where reduced power consumption and high reliability are requirements. A complete family of packages is offered to provide the most flexibility in applications. For surface mount applications, PLCC or SOIC packaging is available. Tape or reel packaging is also available for PLCC or SOIC packages.
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
20
VCC A14 A13 A8 A9 A11 OE/VPP A10 CE O7 O6 O5 O4 O3
2004 Microchip Technology Inc.
27C512A
DS11173G-page 1
27C512A
1.0
1.1
ELECTRICAL CHARACTERISTICS
Maximum Ratings*
TABLE 1-1:
Name A0-A15 CE OE/VPP O0 - O7 VCC VSS NC NU
PIN FUNCTION TABLE
Function Address Inputs Chip Enable Output Enable/Programming Voltage Data Output +5V Power Supply Ground No Connection; No Internal Connection Not Used; No External Connection is Allowed
VCC and input voltages w.r.t. VSS ........ -0.6V to +7.25V VPP voltage w.r.t. VSS during programming ......................................... -0.6V to +14V Voltage on A9 w.r.t. VSS ...................... -0.6V to +13.5V Output voltage w.r.t. VSS ................-0.6V to VCC +1.0V Storage temperature ..........................-65C to +150C Ambient temp. with power applied .....-65C to +125C
*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 1-2:
READ OPERATION DC CHARACTERISTICS
VCC = +5V 10% Commercial: Industrial: Extended (Automotive): Tamb = 0C to +70C Tamb = -40C to +85C Tamb = -40C to +125C Units V V A V V A pF pF mA mA VIN = 0 to VCC IOH = - 400 A IOL = 2.1 mA VOUT = 0V to VCC VIN = 0V; Tamb = 25C; f = 1 MHz VOUT = 0V; Tamb = 25C; f = 1 MHz VCC = 5.5V f = 1 MHz; OE/VPP = CE = VIL; IOUT = 0 mA; VIL = -0.1 to 0.8V; VIH = 2.0 to VCC; Note 1 Conditions
Parameter Input Voltages Input Leakage Output Voltages Output Leakage Input Capacitance Output Capacitance Power Supply Current, Active
Part* all all all all all all C I, E
Status Logic "1" Logic "0"
Symbol VIH VIL ILI
Min 2.0 -0.5 -10 2.4
Max VCC+1 0.8 10 0.45
Logic "1" Logic "0" -- -- -- TTL input TTL input
VOH VOL ILO CIN COUT ICC ICC
-10 -- -- -- --
10 6 12 25 35
Power Supply Current, Standby
C I, E all
TTL input ICC(S)TLL ICC(S)TLL TTL input CMOS input ICC(S)CMOS
-- -- --
1 2 30
mA mA A
CE = Vcc0.2V
* Parts: C=Commercial Temperature Range; I, E=Industrial and Extended Temperature Ranges
Note 1: Typical active current increases .75 mA per MHz up to operating frequency for all temperature ranges.
DS11173G-page 2
2004 Microchip Technology Inc.
27C512A
TABLE 1-3: READ OPERATION AC CHARACTERISTICS
AC Testing Waveform: Output Load: Input Rise and Fall Times: Ambient Temperature: VIH = 2.4V and VIL = .45V; 1 TTL Load + 100 pF 10 ns Commercial: Industrial: Extended (Automotive): 27C512-12 Min -- -- -- 0 0 Max 120 120 50 40 -- VOH = 2.0V and VOL = 0.8V
Tamb = 0C to +70C Tamb = -40C to +85C Tamb = -40C to +125C 27C512-15 Units Conditions Min -- -- -- 0 0 Max 150 150 60 45 -- ns ns ns ns ns CE = OE/ VPP = VIL OE/VPP = VIL CE = VIL
27C512-90* Parameter Address to Output Delay CE to Output Delay OE to Output Delay OE to Output High Impedance Output Hold from Address, CE or OE/ VPP, whichever occurred first Sym Min tACC tCE tOE tOFF tOH -- -- -- 0 0 Max 90 90 40 35 --
27C512-10* Min -- -- -- 0 0 Max 100 100 40 35 --
*90/10 AC Testing Waveforms: VIH = 3.0V and VIL = 0V; VOH = 1.5V and VOL = 1.5V Output Load: 1 TTL Load + 30 pF
FIGURE 1-1:
VIH Address VIL VIH CE VIL
READ WAVEFORMS
Address Valid
tCE(2) VIH OE VIL VOH VOL tACC tOE(2) High Z tOFF(1,3) tOH Valid Output High Z
Outputs O0 - O7
Notes: (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 (3) This parameter is sampled and is not 100% tested.
CE
2004 Microchip Technology Inc.
DS11173G-page 3
27C512A
TABLE 1-4: PROGRAMMING DC CHARACTERISTICS
Ambient Temperature: Tamb = 25C 5C VCC = 6.5V 0.25V, OE/VPP = VH = 13.0V 0.25V Parameter Input Voltages Input Leakage Output Voltages VCC Current, program & verify OE/VPP Current, program A9 Product Identification Status Logic "1" Logic "0" -- Logic "1" Logic "0" -- -- -- Symbol VIH VIL ILI VOH VOL ICC2 IPP2 VID Min. 2.0 -0.1 -10 2.4 -- -- -- 11.5 Max. VCC+1 0.8 10 0.45 35 25 12.5 Units V V A V V mA mA V VIN = 0V to VCC IOH = -400 A IOL = 2.1 mA CE = VIL Conditions (See Note 1)
Note 1: VCC must be applied simultaneously or before VPP voltage on OE/VPP and removed simultaneously or after the VPP voltage on OE/VPP.
TABLE 1-5:
PROGRAMMING AC CHARACTERISTICS
AC Testing Waveform: VIH=2.4V and VIL=0.45V; VOH=2.0V; VOL=0.8V Ambient Temperature: 25C 5C VCC = 6.5V 0.25V, OE/VPP = VH = 13.0V 0.25 V Symbol tAS tDS tDH tAH tDF tVCS tPW tCES tOES tOEH tOR tPRT Min. 2 2 2 0 0 2 95 2 2 2 2 50 Max. -- -- -- -- 130 -- 105 -- -- -- -- -- Units s s s s ns s s s s s s ns 100 s typical Remarks
for Program, Program Verify and Program Inhibit Modes Parameter Address Set-Up Time Data Set-Up Time Data Hold Time Address Hold Time Float Delay (2) VCC Set-Up Time Program Pulse Width (1) CE Set-Up Time OE Set-Up Time OE Hold Time OE Recovery Time
OE /VPP Rise Time During Programming
Note 1: For express algorithm, initial programming width tolerance is 100 s 5%. 2: This parameter is only sampled and not 100% teted. Output float is defined as the point where data is no longer driven (see timing diagram).
DS11173G-page 4
2004 Microchip Technology Inc.
27C512A
FIGURE 1-2: PROGRAMMING WAVEFORMS (1)
Program VIH Address Stable Address VIL VIH Data VIL tAS Data In Stable
Verify
tAH Data Out Valid tDF (2)
6.5 V (3) VCC 5.0V VIH CE VIL tCES
t DS
t DH
tCE tVCS tPW
(2)
tOES
tOEH tOR
13.0 V (3) OE/V PP VIL t PRT Notes: (1) (2) (3) The input timing reference level is 0.8V for V IL and 2.0V for V IH. tDF and t OE are characteristics of the device but must be accommodated by the programmer. VCC = 6.5V 0.25V, V PP = V H = 13.0V 0.5V for express programming algorithm. t OPW
TABLE 1-6:
MODES
CE VIL VIL VIL VIH VIH VIL VIL OE/VPP VIL VH VIL VH X VIH VIL A9 X X X X X X VH O0 - O7 DOUT DIN DOUT High Z High Z High Z Identity Code
Operation Mode Read Program Program Verify Program Inhibit Standby Output Disable Identity
X = Don't Care
1.2
Read Mode
(See Timing Diagrams and AC Characteristics) Read Mode is accessed when a) b) the CE pin is low to power up (enable) the chip the OE/VPP 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 (tOE) from the falling edge of OE/VPP.
2004 Microchip Technology Inc.
DS11173G-page 5
27C512A
1.3 Standby Mode
The standby mode is entered when the CE pin is high, and the program mode is not identified. When this conditions are met, the supply current will drop from 25 mA to 30 A. Since the erased state is "1" in the array, programming of "0" is required. The address to be programmed is set via pins A0 - A15 and the data to be programmed is presented to pins O0 - O7. When data and address are stable, a low going pulse on the CE line programs that location.
1.4
Output Enable OE/VPP
1.7
Verify
This multifunction pin eliminates bus connection in multiple bus microprocessor systems and the outputs go to high impedance when: * the OE/VPP pin is high (VIH). When a VH input is applied to this pin, it supplies the programming voltage (VPP) to the device.
After the array has been programmed it must be verified to ensure all the bits have been correctly programmed. This mode is entered when all the following conditions are met: a) b) c) VCC is at the proper level, the OE/VPP pin is low, and the CE line is low.
1.5
Erase Mode (UV Windowed Versions)
1.8
Inhibit
Windowed products offer the ability to erase the memory array. The memory matrix is erased to the all "1's" state as a result of being exposed to ultraviolet light. To ensure complete erasure, a dose of 15 watt-second/ cm2 is required. This means that the device window must be placed within one inch and directly underneath an ultraviolet lamp with a wavelength of 2537 Angstroms, intensity of 12,000 mW/cm2 for approximately 40 minutes.
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; all other devices with CE held high will not be programmed with the data (although address and data will be available on their input pins).
1.9
Identity Mode
1.6
Programming Mode
The Express algorithm must be used for best results. It has been developed to improve programming yields and throughput times in a production environment. Up to 10 100-microsecond pulses are applied until the byte is verified. A flowchart of the Express algorithm is shown in Figure 1-3. Programming takes place when: a) b) c) VCC is brought to the proper voltage, OE/VPP is brought to the proper VH level, and CE line is low.
In this mode specific data is output which identifies the manufacturer as Microchip Technology Inc. and the device type. This mode is entered when Pin A9 is taken to VH (11.5V to 12.5V). The CE and OE/VPP lines must be at VIL. A0 is used to access any of the two non-erasable bytes whose data appears on O0 through O7.
Pin Identity
Input A0 VIL VIH
Output 0OOOOOOO 76543210 H e x
Manufacturer Device Type*
0 0 1 0 1 0 0 1 29 1 0 0 0 1 1 0 0 0D
* Code subject to change
DS11173G-page 6
2004 Microchip Technology Inc.
27C512A
FIGURE 1-3: PROGRAMMING EXPRESS ALGORITHM
Conditions: Tamb = 25*C 5*C VCC = 6.5 0.25V VPP = 13.0 0.25V
Start
ADDR = First Location VCC = 6.5V VPP = 13.0V
X=0 Program one 100 s pulse Increment X
Verify Byte
Pass
Fail No X = 10 ? Yes
Device Failed
Last Address?
Yes
No Increment Address
VCC = V PP = 4.5V, 5.5V
Device Passed
Yes
All bytes = original data?
No
Device Failed
2004 Microchip Technology Inc.
DS11173G-page 7
27C512A
27C512A Product Identification System
To order or to obtain information (e.g., on pricing or delivery),, please use listed part numbers, and refer to factory or listed sales offices.
27C512A - 70 I
/P Package: L= P= SO = Blank = I= E= 90 10 12 15 27C512A = = = = Plastic Leaded Chip Carrier Plastic DIP (600 Mil) Plastic SOIC (300 Mil) 0C to +70C -40C to +85C -40C to +125C 90 ns 100 ns 120 ns 150 ns 512K (64K x 8) CMOS EPROM
Temperature Range:
Access Time:
Device:
DS11173G-page 8
2004 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices: * * Microchip products meet the specification contained in their particular Microchip Data Sheet. Microchip believes that its family of products is one of the most secure families 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 Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is 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 products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
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, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 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. (c) 2004, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona and Mountain View, California in October 2003. The Company's quality system processes and procedures are for its PICmicro(R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified.
2004 Microchip Technology Inc.
DS11173G-page 9
WORLDWIDE SALES AND SERVICE
AMERICAS
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07/12/04
2004 Microchip Technology Inc.

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