13

3606A–FLASH–12/05

AT49F040B

19. Program Cycle Waveforms

20. 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 555. For sector erase the address depends on what sector is to be erased. (See note

5 under “Command Definition Table” on page 7.)

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

18. Program Cycle Characteristics

Symbol

Parameter

Min

Typ

Max

Units

t

BP

Byte Programming Time

12

120

µs

t

AS

Address Set-up Time

0

ns

Address Hold Time

10

ns

t

DS

Data Set-up Time

20

ns

t

DH

Data Hold Time

0

ns

Write Pulse Width

20

ns

t

WPH

Write Pulse Width High

20

ns

t

EC

Chip Erase Cycle Time

7

seconds

Main Sector Erase Cycle Time

750

ms

A0 - A18

OE

(1)

AA

80

Note 3

55

55

555

555

Note 2

AA

BYTE 0

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

AAA

AAA

CE

WE

A0 - A18

DATA

555