8

AT49F2048A

Program Cycle Waveforms

Sector or Chip Erase Cycle Waveforms

Notes:

1.

OE must be high only when WE and CE are both low.

2.

For chip erase, the address should be 5555. For sector erase, the address depends on what sector is to be erased. (See

note 4 under Command Definitions.)

3.

For chip erase, the data should be 10H, and for sector erase, the data should be 30H.

Program Cycle Characteristics

Symbol

Parameter

Min

Max

Units

t

BP

Byte/Word Programming Time

50

µ

s

t

AS

Address Setup Time

0

ns

t

AH

Address Hold Time

50

ns

t

DS

Data Setup Time

50

ns

t

DH

Data Hold Time

0

ns

t

WP

Write Pulse Width

50

ns

t

WPH

Write Pulse Width High

40

ns

t

EC

Erase Cycle Time

5

seconds

CE

WE

DATA

A0-A16

OE

5555

2AAA

5555

AA

55

A0

ADDRESS

PROGRAM CYCLE

INPUT

DATA

5555

AA

CE

WE

DATA

A0-A16

OE

5555

2AAA

5555

AA

55

80

5555

2AAA

Note 2

AA

55

Note 3

BYTE/

WORD 0

BYTE/

WORD 1

BYTE/

WORD 2

BYTE/

WORD 3

BYTE/

WORD 4

BYTE/

WORD 5

(1)