27C256-25I/P [MICROCHIP]

256K (32K x 8) Low-Voltage CMOS EPROM; 256K （ 32K ×8 ）低电压CMOS EPROM


型号：	27C256-25I/P
厂家：	MICROCHIP
描述：	256K (32K x 8) Low-Voltage CMOS EPROM 256K （ 32K ×8 ）低电压CMOS EPROM 存储内存集成电路光电二极管可编程只读存储器 OTP只读存储器电动程控只读存储器
文件：	总10页 (文件大小：132K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Obsolete Device

27LV256

256K (32K x 8) Low-Voltage CMOS EPROM

FEATURES

PACKAGE TYPES

PDIP

• Wide voltage range 3.0V to 5.5V

• High speed performance

V_PP• 1

28 V_CC

27 A14

26 A13

25 A8

24 A9

23 A11

22 OE

21 A10

20 CE

19 O7

18 O6

17 O5

16 O4

15 O3

A12

- 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 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

• Organized 32K x 8: JEDEC standard pinouts

- 28-pin Dual-in-line package

V_SS14

PLCC

A11

- 32-pin PLCC package

A10

- 28-pin SOIC package

- Tape and reel

• Data Retention > 200 years

• Available for the following temperature ranges:

- Commercial:

- Industrial:

0°C to +70°C

-40°C to +85°C

SOIC

VPP

A12

VCC

A14

A13

DESCRIPTION

The Microchip Technology Inc. 27LV256 is a low volt-

age (3.0 volt) CMOS EPROM designed for battery

powered 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

today’s' low voltage microprocessors and peripherals in

battery powered applications.

A11

A10

V^SS

A complete family of packages is offered to provide the

most flexibility 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.

2004 Microchip Technology Inc.

DS11020H-page 1

27LV256

TABLE 1-1:

Name

PIN FUNCTION TABLE

Function

1.0

ELECTRICAL

CHARACTERISTICS

1.1

Maximum Ratings*

A0-A14

Address Inputs

Chip Enable

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

Output Enable

Programming Voltage

Data Output

VPP

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 ..........................-65°C to +150°C

Ambient temp. with power applied .....-65°C to +125°C

O0 - O7

VCC

+5V or +3V Power Supply

Ground

VSS

*Notice: Stresses above those listed under “Maximum 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 specification is not implied. Exposure to maximum rating con-

ditions for extended periods may affect device reliability.

No Connection; No Internal

Connection

Not Used; No External Connection Is

Allowed

TABLE 1-2:

READ OPERATION DC CHARACTERISTICS

VCC = +5V ±10% or 3.0V where indicated

Commercial:

Industrial:

Tamb = 0°C to +70°C

Tamb = -40°C to +85°C

Parameter

Part*

Status

Symbol Min.

Max.

Units Conditions

Input Voltages

all

Logic "1"

Logic "0"

VIH

VIL

2.0

-0.5

VCC+1

0.8

Input Leakage

all

ILI

-10

2.4

µA VIN = 0 to VCC

Output Voltages

Logic "1"

Logic "0"

VOH

VOL

IOH = -400 µA

IOL = 2.1 mA

0.45

Output Leakage

all

—

ILO

-10

—

µA VOUT = 0V to VCC

Input Capacitance

CIN

pF VIN = 0V; Tamb = 25°C;

f = 1 MHz

Output Capacitance

all

—

COUT

—

pF VOUT = 0V; Tamb = 25°C;

f = 1 MHz

Power Supply Current,

Active

TTL input

ICC1

ICC2

—

20 @ 5.0V

8 @ 3.0V

25 @ 5.0V

10 @ 3.0V

mA VCC = 5.5V; VPP = VCC

mA f = 1 MHz;

mA OE = CE = VIL;

mA IOUT = 0 mA;

VIL = -0.1 to 0.8V;

VIH = 2.0 to VCC;

Note 1

Power Supply Current,

Standby

TTL input

ICC(S)

—

1 @ 3.0V

2 @ 3.0V

all

CMOS input

100 @ 3.0V µA CE=VCC ± 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.

DS11020H-page 2

2004 Microchip Technology Inc.

27LV256

TABLE 1-3:

READ OPERATION AC CHARACTERISTICS

AC Testing Waveform:

Output Load:

VIH = 2.4V and VIL = 0.45V; VOH = 2.0V VOL = 0.8V

1 TTL Load + 100 pF

Input Rise and Fall Times: 10 ns

Ambient Temperature:

Commercial:

Industrial:

Tamb = 0°C to +70°C

Tamb = -40°C to +85°C

27HC256-20

27HC256-25

27HC256-30

Parameter

Sym

Units

Conditions

Min

Max

Min

Max

Min

Max

Address to Output Delay

CE to Output Delay

OE to Output Delay

tACC

tCE

—

200

100

—

250

125

—

300

125

CE = OE = VIL

OE = VIL

tOE

CE = VIL

CE or OE to O/P High

Impedance

tOFF

Output Hold from

Address CE or OE,

whichever goes first

tOH

—

FIGURE 1-1: READ WAVEFORMS

VIH

Address

Address valid

VIL

VIH

VIL

tCE(2)

VIH

VIL

tOFF(1,3)

tOH

tOE(2)

VOH

Outputs

O0 - O7

High Z

Valid Output

VOL

tACC

Notes: (1) tOFF 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.

2004 Microchip Technology Inc.

DS11020H-page 3

27LV256

TABLE 1-4:

PROGRAMMING DC CHARACTERISTICS

Ambient Temperature: Tamb = 25°C ± 5°C

VCC = 6.5V ± 0.25V, VPP = 13.0V ± 0.25V

Parameter

Status

Symbol

Min

Max.

Units

Conditions

Input Voltages

Logic”1”

Logic”0”

VIH

VIL

2.0

-0.1

VCC+1

0.8

Input Leakage

—

ILI

-10

2.4

µA

VIN = 0V to VCC

Output Voltages

Logic”1”

Logic”0”

VOH

VOL

IOH = -400 µA

IOL = 2.1 mA

0.45

VCC Current, program & verify

VPP Current, program

—

ICC2

IPP2

—

Note 1

A9 Product Identification

11.5

12.5

Note 1: VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.

TABLE 1-5:

PROGRAMMING AC CHARACTERISTICS

for Program, Program Verify

and Program Inhibit Modes

AC Testing Waveform: VIH=2.4V and VIL=0.45V; VOH=2.0V; VOL=0.8V

Output Load: 1 TLL Load + 100pF

Ambient Temperature: Tamb=25°C±5°C

VCC= 6.5V ± 0.25V, VPP =13.0V ± 0.25V

Parameter

Symbol

Min. Max. Units

Remarks

Address Set-Up Time

Data Set-Up Time

Data Hold Time

tAS

tDS

—

µs

tDH

—

Address Hold Time

Float Delay (2)

tAH

—

tDF

130

—

VCC Set-Up Time

Program Pulse Width (1)

CE Set-Up Time

tVCS

tPW

tCES

tOES

tVPS

tOE

105

—

100 µs typical

OE Set-Up Time

—

VPP Set-Up Time

Data Valid from OE

—

100

Note 1: For express algorithm, initial programming width tolerance is 100 µs ±5%.

2: This parameter is only sampled and not 100% tested. Output float is defined as the point where data is no

longer driven (see timing diagram).

DS11020H-page 4

2004 Microchip Technology Inc.

27LV256

FIGURE 1-2: PROGRAMMING WAVEFORMS

Program

Verify

VIH

Address

Data

Address Stable

VIL

VIH

VIL

tAS

tDS

tAH

High Z

Data Stable

Data Out Valid

tDF

(1)

tDH

13.0V(2)

5.0V

6.5V(2)

5.0V

VIH

VPP

VCC

tVPS

tVCS

VIL

tOES

tPW

tOE

(1)

VIH

tOPW

VIL

Notes:

(1) tDF and t OE are characteristics of the device but must be accommodated by the programmer

(2) VCC = 6.5V ±0.25V, V PP = VH = 13.0V ±0.25V for express algorithm

TABLE 1-6:

MODES

Operation Mode

VPP

O0 - O7

Read

VIL

VIH

VIL

VIH

VIL

VIH

VCC

DOUT

DIN

Program

Program Verify

Program Inhibit

Standby

DOUT

High Z

VCC

High Z

Output Disable

Identity

VIH

VIL

High Z

Identity Code

X = Don’t Care

1.2

Read Mode

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 OE (tOE).

(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

2004 Microchip Technology Inc.

DS11020H-page 5

27LV256

1.3

Standby Mode

1.6

Verify

The standby mode is defined when the CE pin is high

(VIH) and a program mode is not defined. Output Dis-

able

After the array has been programmed it must be veri-

fied to ensure that all the bits have been correctly pro-

grammed. This mode is entered when all of the

following conditions are met:

1.4

Output Enable

a) VCC is at the proper level

b) VPP is at the proper VH level

c) the CE pin is high

This feature eliminates bus contention in multiple bus

microprocessor systems and the outputs go to a high

impedance when the following condition is true:

d) the OE line is low

•

The OE pin is high and program mode is not

defined.

1.7

Inhibit

When Programming multiple devices in parallel with

different data, only CE needs to be under separate con-

trol to each device. By pulsing the CE line low on a par-

ticular device, that device will be programmed, and all

other devices with CE held high will not be pro-

grammed with the data although address and data are

available on their input pins.

1.5

Programming 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 verified. No over-programming

is required. A flowchart of the express algorithm is

shown in Figure 1.

1.8

Identity Mode

Programming takes place when:

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 VH (11.5V to 12.5V). The CE and OE lines

must be at VIL. A0 is used to access any of the two

non-erasable bytes whose data appears on O0 through

O7.

a) VCC is brought to the proper voltage

b) VPP is brought to the proper VH level

c) the OE pin is high

d) the CE pin is low

Since the erased state is “1” in the array, programming

of “0” 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.

Identity

Input

Output

A0 0 O O O O O O O

Manufacturer

Device Type*

VIL

VIH

* Code subject to change.

DS11020H-page 6

2004 Microchip Technology Inc.

27LV256

FIGURE 1-3: PROGRAMMING EXPRESS ALGORITHM

Conditions:

amb = 25+/-5C

CC = 6.5+/-0.25V

PP = 13.0+/-0.25V

Start

ADDR = First Location

CC = 6.5V

PP = 13.0V

X = 0

Program one 100

s pulse

Pass

Increment X

Verify

Byte

Fail

Yes

Device

Failed

X = 10?

Last

Address?

Yes

Increment Address

CC = VPP = 4.5V, 5.5V

All

Yes

bytes

= original

data?

Device

Passed

Device

Failed

2004 Microchip Technology Inc.

DS11020H-page 7

27LV256

27LV256 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.

27LV256

–

L = Plastic Leaded Chip Carrier

P = Plastic DIP (600 Mil)

Package:

SO = Plastic SOIC (300 Mil)

Temperature

Range:

Blank = 0°C to +70°C

I = -40°C to +85°C

20 = 200 ns

25 = 250 ns

30 = 300 ns (SOIC only)

Access

Time:

Device:

27LV256

256K (32K x 8) Low-Voltage CMOS EPROM

DS11020H-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.

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^®8-bit MCUs, KEELOQ^®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.

DS11020H-page 9

WORLDWIDE SALES AND SERVICE

China - Beijing

Singapore

AMERICAS

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support: 480-792-7627

Web Address: www.microchip.com

Unit 706B

200 Middle Road

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Tel: 86-10-85282100

Fax: 86-10-85282104

#07-02 Prime Centre

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Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan

Kaohsiung Branch

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Tel: 886-7-536-4816

Fax: 886-7-536-4817

China - Chengdu

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ASIA/PACIFIC

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United Kingdom

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Winnersh Triangle

Korea

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Fax: 44-118-921-5820

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or

82-2-558-5934

07/12/04

 2004 Microchip Technology Inc.

27C256-25I/P [MICROCHIP]

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