M27C256B-70C6 Datasheet M27C256B-15C1, M27C256B-15B1, M27C256B-70XF1 | P1-P3

1/16August 2002

M27C256B

256 Kbit (32Kb x 8) UV EPROM and OTP EPROM

■ 5V ± 10% SUPPLY VOLTAGE in READ

OPERATION

■ ACCESS TIME: 45ns

■ LOW POWER CONSUMPTION:

– Active Current 30mA at 5MHz

– Standby Current 100µA

■ PROGRAMMING VOLTAGE: 12.75V ± 0.25V

■ PROGRAMMING TIME: 100µs/word

■ ELECTRONIC SIGNATURE

– Manufacturer Code: 20h

– Device Code: 8Dh

DESCRIPTION

The M27C256B is a 256 Kbit EPROM offered in

the two ranges UV (ultra violet erase) and OTP

(one time programmable). It is ideally suited for mi-

croprocessor systems and is organized as 32,768

by 8 bits.

The FDIP28W (window ceramic frit-seal package)

has a transparent lid which allows the user to ex-

pose the chip to ultraviolet light to erase the bit pat-

tern. A new pattern can then be written to the

device by following the programming procedure.

For applications where the content is programmed

only one time and erasure is not required, the

M27C256B is offered in PDIP28, PLCC32 and

TSOP28 (8 x 13.4 mm) packages.

Figure 1. Logic Diagram

AI00755B

15

A0-A14 Q0-Q7

V

PP

V

CC

M27C256B

G

E

V

SS

8

1

28

1

FDIP28W (F) PDIP28 (B)

PLCC32 (C) TSOP28 (N)

8 x 13.4 mm

M27C256B

2/16

Figure 2B. LCC Connections

AI00757

A13

A8

A10

Q4

17

A0

NC

Q0

Q1

Q2

DU

Q3

A6

A3

A2

A1

A5

A4

9

A14

A9

1

V

PP

A11

Q6

A7

Q7

32

DU

V

CC

M27C256B

A12

NC

Q5

G

E

25

V

SS

Figure 2A. DIP Connections

A1

A0

Q0

A7

A4

A3

A2

A6

A5

A13

A10

A8

A9

Q7

A14

A11

G

E

Q5Q1

Q2

Q3V

SS

Q4

Q6

A12

V

PP

V

CC

AI00756

M27C256B

8

1

2

3

4

5

6

7

9

10

11

12

13

14

16

15

28

27

26

25

24

23

22

21

20

19

18

17

Figure 2C. TSOP Connections

A1

A0

Q0

A5

A2

A4

A3

A9

A11

Q7

A8

G

E

Q5

Q1

Q2

Q3

Q4

Q6

A13

A14

A12

A6

V

PP

V

CC

A7

AI00614B

M27C256B

28

1

22

78

14

15

21

V

SS

A10

Table 1. Signal Names

A0-A14 Address Inputs

Q0-Q7 Data Outputs

E

Chip Enable

G

Output Enable

V

PP

Program Supply

V

CC

Supply Voltage

V

SS

Ground

NC Not Connected Internally

DU Don’t Use

3/16

M27C256B

Table 2. Absolute Maximum Ratings

(1)

Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may

cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions

above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-

tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-

ity documents.

2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC

voltage on Output is V

CC

+0.5V with possible overshoot to V

CC

+2V for a period less than 20ns.

3. Depends on range.

Table 3. Operating Modes

Note: X = V

IH

or V

IL

, V

ID

= 12V ± 0.5V.

Table 4. Electronic Signature

Symbol Parameter Value Unit

T

A Ambient Operating Temperature

(3)

–40 to 125 °C

T

BIAS

Temperature Under Bias –50 to 125 °C

T

STG

Storage Temperature –65 to 150 °C

V

IO

(2)

Input or Output Voltage (except A9) –2 to 7 V

V

CC

Supply Voltage –2 to 7 V

V

A9

(2)

A9 Voltage –2 to 13.5 V

V

PP

Program Supply Voltage –2 to 14 V

Mode E

G A9

V

PP

Q7-Q0

Read

V

IL

V

IL

X

V

CC

Data Out

Output Disable

V

IL

V

IH

X

V

CC

Hi-Z

Program

V

IL

Pulse V

IH

X

V

PP

Data In

Verify

V

IH

V

IL

X

V

PP

Data Out

Program Inhibit

V

IH

V

IH

X

V

PP

Hi-Z

Standby

V

IH

XX

V

CC

Hi-Z

Electronic Signature

V

IL

V

IL

V

ID

V

CC

Codes

Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data

Manufacturer’s Code

V

IL

00100000 20h

Device Code

V

IH

10001101 8Dh

M27C256B-70C6

M27C256B-70C6

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