
4
White Microelectronics Phoenix, AZ (602) 437-1520
7
F
WF128K16, WF256K16-XCX5
AC CHARACTERISTICS – WRITE/ERASE/PROGRAM OPERATIONS, WE CONTROLLED
(V
CC
= 5.0V, V
SS
= 0V, T
A
= -55
°
C to +125
°
C)
Parameter
Symbol
-50
-60
-70
-90
-120
-150
Unit
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Write Cycle Time
t
AVAV
t
WC
50
60
70
90
120
150
ns
Chip Select Setup Time
t
ELWL
t
CS
0
0
0
0
0
0
ns
Write Enable Pulse Width
t
WLWH
t
WP
25
30
35
45
50
50
ns
Address Setup Time
t
AVWL
t
AS
0
0
0
0
0
0
ns
Data Setup Time
t
DVWH
t
DS
25
30
30
45
50
50
ns
Data Hold Time
t
WHDX
t
DH
0
0
0
0
0
0
ns
Address Hold Time
t
WLAX
t
AH
40
45
45
45
50
50
ns
Chip Select Hold Time
t
WHEH
t
CH
0
0
0
0
0
0
ns
Write Enable Pulse Width High
t
WHWL
t
WPH
20
20
20
20
20
20
ns
Duration of Byte Programming Operation (min)
t
WHWH1
14
14
14
14
14
14
μ
s
Chip and Sector Erase Time
t
WHWH2
2.2
60
2.2
60
2.2
60
2.2
60
2.2
60
2.2
60
sec
Read Recovery Time Before Write
t
GHWL
0
0
0
0
0
0
ns
V
CC
Setup Time
t
VCS
50
50
50
50
50
50
μ
s
Chip Programming Time
12.5
12.5
12.5
12.5
12.5
12.5
sec
Output Enable Setup Time
t
OES
0
0
0
0
0
0
ns
Output Enable Hold Time (1)
t
OEH
10
10
10
10
10
10
ns
1. For Toggle and Data Polling.
AC CHARACTERISTICS – READ ONLY OPERATIONS
(V
CC
= 5.0V, V
SS
= 0V, T
A
= -55
°
C to +125
°
C)
Parameter
Symbol
-50
-60
-70
-90
-120
Min
120
-150
Unit
Min
50
Max
Min
60
Max
Min
70
Max
Min
90
Max
Max
Min
150
Max
Read Cycle Time
Address Access Time
Chip Select Access Time
OE to Output Valid
Chip Select to Output High Z (1)
OE High to Output High Z (1)
Output Hold from Address, CS or OE Change,
whichever is first
1. Guaranteed by design, not tested.
t
AVAV
t
AVQV
t
ELQV
t
GLQV
t
EHQZ
t
GHQZ
t
AXQX
t
RC
t
ACC
t
CE
t
OE
t
DF
t
DF
t
OH
ns
ns
ns
ns
ns
ns
ns
50
50
25
20
20
60
60
30
20
20
70
70
35
20
20
90
90
40
25
25
120
120
50
30
30
150
150
55
35
35
0
0
0
0
0
0