King Billion Electronics Co., Ltd

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SF23C4000

August 27, 2003

Page 3 of 6

V1.1

This specification is subject to change without notice. Please contact sales person for the latest version before use.

3 Functional block diagram

4 Pin Description

SF23C4000-PLCC32

A1

11

A2

2

A3

9

A4

8

A5

7

A6

6

A7

5

A14

29

A13

28

OE

24

A8

27

A10

23

A11

25

Q0

13

Q7

21

CE

22

A0

12

A9

26

Symbol

Pin No. I/O

Description

VDD

32

P Positive power supply input pin.

VSS

16

P Gound pin.

CEn

22

I

The CEn (Chip Enable) input is the device selection and power control for

internal Mask ROM array. Whenever CEn goes high, the internal Mask

ROM will enter standby (power saving) mode. Otherwise, it is in active

mode and the contents of the ROM can be accessed.

MEMORY

CELL

ARRAY

SENSE

AMP.

OEn

X BUFFER &

DECODER

[Q7.. Q0]

CONTROL

LOGIC

Y BUFFER &

DECODER

CEn

[A18..A0]