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P4C168, P4C169, P4C170
Notes:
10.
CE/CS and WE must be LOW for WRITE cycle.
11. If
CE/CS goes HIGH simultaneously with WE HIGH, the output
remains in a high impedance state.
12. Write Cycle Time is measured from the last valid address to the first
transitioning address.
ADDRESS
CE/CS
t WC
DATA VALID
HIGH IMPEDANCE
WE
DATA IN
DATA OUT
DATA UNDEFINED
(12)
(8)
t CW
t AW
t WP
t DW
t WR
t AH
t DH
t OW
t AS
t WZ
(8,11)
TIMING WAVEFORM OF WRITE CYCLE NO. 1 (
WE
WE
WE
WE
WE CONTROLLED)(10)
AC ELECTRICAL CHARACTERISTICS - WRITE CYCLE
(V
CC = 5V ± 10%, All Temperature Ranges)
(2)
Sym.
Parameter
Write Cycle Time
Chip Enable Time to
End of Write
Address Valid to
End of Write
Address Set-up Time
Write Pulse Width
Address Hold Time
Data Valid to End
of Write
Data Hold Time
Write Enable to
Output in High Z
Output Active from
End of Write
t
WC
t
CW
t
WP
t
AH
t
DW
t
DH
t
WZ
t
AS
t
OW
–12
–15
t
AW
–20
–25
–35
Min
12
12
12
12
0
7
0
0
4
Max Min
15
15
15
0
15
0
8
0
0
Max
5
Min
18
18
18
0
18
0
10
0
0
Max
7
Min
20
20
20
0
0
10
0
0
20
Max
7
Min
35
30
30
0
30
0
15
0
0
Max
Unit
ns
ns
ns
ns
ns
ns
ns
0
ns
ns
13
ns
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