AT49F1024/1025

8

Program Cycle Waveforms

Main Memory 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 10H. For a main memory erase the data should be 30H.

Program Cycle Characteristics

Symbol

Parameter

Min

Typ

Max

Units

t

BP

Word Programming Time

10

50

µs

t

AS

Address Set-up Time

0

ns

t

AH

Address Hold Time

50

ns

t

DS

Data Set-up Time

50

ns

t

DH

Data Hold Time

0

ns

t

WP

Write Pulse Width

90

ns

t

WPH

Write Pulse Width High

90

ns

t

EC

Erase Cycle Time

10

seconds

A0-A15

OE

AA

80

NOTE 3

55

55

5555

5555

5555

AA

WORD 0

WORD 1

WORD 2

WORD 3

WORD 4

WORD 5

2AAA

2AAA

CE

WE

A0-A15

DATA

5555