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White Microelectronics • Phoenix, AZ • (602) 437-1520
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WF128K16, WF256K16-XCX5
AC CHARACTERISTICS – WRITE/ERASE/PROGRAM OPERATIONS, WE CONTROLLED
(VCC = 5.0V, VSS = 0V, TA = -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
tAVAV
tWC
50
60
70
90
120
150
ns
Chip Select Setup Time
tELWL
tCS
0
0
00
00
ns
Write Enable Pulse Width
tWLWH
tWP
25
30
35
45
50
50
ns
Address Setup Time
tAVWL
tAS
0
0
00
00
ns
Data Setup Time
tDVWH
tDS
25
30
30
45
50
50
ns
Data Hold Time
tWHDX
tDH
0
0
00
00
ns
Address Hold Time
tWLAX
tAH
40
45
45
45
50
50
ns
Chip Select Hold Time
tWHEH
tCH
0
0
00
00
ns
Write Enable Pulse Width High
tWHWL
tWPH
20
20
20
20
20
20
ns
Duration of Byte Programming Operation (min)
tWHWH1
14
14
14
14
14
14
µs
Chip and Sector Erase Time
tWHWH2
2.2
60
2.2
60
2.2
60
2.2
60
2.2
60
2.2
60
sec
Read Recovery Time Before Write
tGHWL
0
0
00
00
ns
VCC Setup Time
tVCS
50
50
50
50
50
50
µs
Chip Programming Time
12.5
12.5
12.5
12.5
12.5
12.5
sec
Output Enable Setup Time
tOES
0
0
00
00
ns
Output Enable Hold Time (1)
tOEH
10
10
10
10
10
10
ns
1. For Toggle and Data Polling.
AC CHARACTERISTICS – READ ONLY OPERATIONS
(VCC = 5.0V, VSS = 0V, TA = -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
Read Cycle Time
tAVAV
tRC
50
60
70
90
120
150
ns
Address Access Time
tAVQV
tACC
50
60
70
90
120
150
ns
Chip Select Access Time
tELQV
tCE
50
60
70
90
120
150
ns
OE to Output Valid
tGLQV
tOE
25
30
35
40
50
55
ns
Chip Select to Output High Z (1)
tEHQZ
tDF
20
20
20
25
30
35
ns
OE High to Output High Z (1)
tGHQZ
tDF
20
20
20
25
30
35
ns
Output Hold from Address, CS or OE Change,
tAXQX
tOH
00
0
0
0
0
ns
whichever is first
1. Guaranteed by design, not tested.
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