W49F020Q-90 datasheet(5/21 Pages) WINBOND

Part #	W49F020Q-90

Description	256K X 8 CMOS FLASH MEMORY

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Manufacturer	WINBOND [Winbond]

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Preliminary W49F020

Publication Release Date: October 1999

- 5 -

Revision A1

TABLE OF OPERATING MODES

Operating Mode Selection

(VHH = 12V

± 5%)

MODE

PINS

CE

OE

WE

ADDRESS

DQ.

Read

VIL

VIH

AIN

Dout

Write

VIL

VIH

VIL

AIN

Din

Standby

VIH

X

High Z

Write Inhibit

X

VIL

X

High Z/DOUT

X

VIH

X

High Z/DOUT

Output Disable

X

VIH

X

High Z

Product ID

VIL

VIH

A0 = VIL; A1

−A17 = VIL;

A9 = VHH

Manufacturer Code DA (Hex)

VIL

VIH

A0 = VIL; A1

−A17 = VIL;

A9 = VHH

Device Code 8C (Hex)

TABLE OF COMMAND DEFINITION

COMMAND

NO. OF 1ST CYCLE 2ND CYCLE 3RD CYCLE 4TH CYCLE 5TH CYCLE 6TH CYCLE

DESCRIPTION

Cycles

Addr. Data

Read

1

AIN

DOUT

Chip Erase

6

5555 AA

2AAA 55

5555 80

5555 AA

2AAA 55

5555 10

Byte Program

4

5555 AA

2AAA 55

5555 A0

AIN

DIN

Boot Block Lockout

6

5555 AA

2AAA 55

5555 80

5555 AA

2AAA 55

5555 40

Product ID Entry

3

5555 AA

2AAA 55

5555 90

Product ID Exit

(1)

3

5555 AA

2AAA 55

5555 F0

Product ID Exit

(1)

1

XXXX F0

Notes:

1. Address Format: A14

−A0 (Hex); Data Format: DQ7-DQ0 (Hex)

2. Either one of the two Product ID Exit commands can be used.

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