Program Cycle Characteristics
Symbol
t
BP
t
AS
t
AH
t
DS
t
DH
t
WP
t
WPH
t
EC
Parameter
Word Programming Time
Address Set-up Time
Address Hold Time
Data Set-up Time
Data Hold Time
Write Pulse Width
Write Pulse Width High
Erase Cycle Time
0
50
50
0
90
90
10
Min
Typ
10
Max
50
Units
µs
ns
ns
ns
ns
ns
ns
seconds
Program Cycle Waveforms
A0-A15
Main Memory or Chip Erase Cycle Waveforms
OE
CE
t
WP
t
WPH
WE
t
AS
t
AH
5555
t
DH
2AAA
5555
5555
2AAA
5555
A0-A15
t
DS
t
EC
55
WORD 1
80
WORD 2
AA
WORD 3
55
WORD 4
NOTE 3
WORD 5
DATA
AA
WORD 0
Notes:
1.
2.
OE must be high only when WE and CE are both low.
For chip erase, the address should be 10H. For a main memory erase the data should be 30H.
8
AT49F1024/1025