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P4C1256
Notes:
6.
CE
1 and WE must be LOW for WRITE cycle.
7.
OE is LOW for this WRITE cycle to show t
WZ and tOW.
8.
If
CE
1 goes HIGH simultaneously with WE HIGH, the output remains
in a high impedance state.
-35
AC CHARACTERISTICS—WRITE CYCLE
(V
CC = 5V ± 10%, All Temperature Ranges)
(2)
9. Write Cycle Time is measured from the last valid address to the first
transitioning address.
Sym.
t
WC
t
CW
t
AS
t
WP
t
AH
t
DW
t
DH
Parameter
Write Cycle Time
Chip Enable
Time to End of
Write
Address Set-up
Time
Write Pulse
Width
Address Hold
Time
Date Hold Time
Data Valid to
End of Write
Min Max Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
-20
-25
-45
-55
-70
-12
-15
Unit
12
0
0
9
0
8
15
11
0
20
15
0
25
0
18
0
35
0
22
0
45
0
25
0
55
0
30
0
70
0
35
0
9
10
0
9
15
0
11
18
20
0
13
22
25
0
15
30
35
0
20
35
40
0
25
40
45
0
30
ns
ns
ns
ns
ns
ns
ns
ns
t
AW
Address Valid to
End of Write
9
10
15
00
Write Enable to
Output in High Z
t
WZ
7
8
10
11
15
18
25
30
ns
Output Active
from End of Write
t
OW
3
3
335500
ns
WRITE CYCLE NO. 1 (
WE
WE
WE
WE
WE CONTROLLED)(6)
ADDRESS
CE
tWC
DATA VALID
HIGH IMPEDANCE
WE
DATA IN
DATA OUT
DATA UNDEFINED
(9)
(4)
tCW
tAW
tWP
tDW
tAH
tDH
tOW
tAS
tWZ
(4,7)
(7)
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