Preliminary W27E020

256K

× 8 ELECTRICALLY ERASABLE EPROM

Publication Release Date: December 1997

- 1 -

Revision A1

GENERAL DESCRIPTION

The W27E020 is a high speed, low power Electrically Erasable and Programmable Read Only

Memory organized as 262144

× 8 bits that operates on a single 5 volt power supply. The W27E020

provides an electrical chip erase function.

FEATURES

70/90/120 nS (max.)

30 mA (max.)

compatible

PLCC

PIN CONFIGURATIONS

A6

A5

A4

A3

A2

A1

A0

Q0

5

6

7

8

9

10

11

12

13

Q

1

Q

2

Q

4

Q

5

Q

6

1

4

4 3

2

1

3

2

3

1

3

0

A14

A13

A8

A9

OE

A11

Q7

29

28

27

26

25

24

23

22

21

32-pin PLCC

G

N

D

1

5

1

6

1

7

1

8

1

9

2

0

1

7

V

c

c

CE

A10

Q5

OE

A10

Q7

Q6

A13

A8

A9

A11

PGM

A17

Q0

A0

A2

A3

A4

A5

A6

A7

A12

A15

A16

A14

A1

Vcc

Vpp

A

1

5

A

1

6

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

30

31

32

25

26

27

28

29

20

21

22

23

24

19

18

17

Q3

Q4

GND

Q2

CE

Q1

Q

3

A7

A

1

2

V

p

p

/

P

G

M

A

BLOCK DIAGRAM

CONTROL

OUTPUT

BUFFER

DECODER

CORE

ARRAY

Q0

Q7

.

CE

OE

A0

.

PGM

V

GND

CC

A17

PIN DESCRIPTION

SYMBOL

DESCRIPTION

A0

−A17

Address Inputs

Q0

−Q7

Data Inputs/Outputs

CE

Chip Enable

OE

Output Enable

PGM

Program Enable

Program/Erase Supply Voltage

Power Supply

GND

Ground