WCFS4008V1C
Switching Waveforms
(continued)
Write Cycle No. 1(WE Controlled, OE HIGH During Write)
t
WC
ADDRESS
t
SCE
CE
t
AW
t
SA
WE
t
PWE
t
HA
OE
t
SD
DATA I/O
NOTE 14
t
HZOE
DATA
IN
VALID
t
HD
Write Cycle No. 2 (WE Controlled, OE LOW)
t
WC
ADDRESS
t
SCE
CE
t
AW
t
SA
WE
t
SD
DATA I/O
NOTE 14
t
HZWE
DATA VALID
t
PWE
t
HA
t
HD
t
LZWE
Truth Table
CE
H
L
L
L
OE
X
L
X
H
WE
X
H
L
H
I/O
0
– I/O
7
High Z
Data Out
Data In
High Z
Power-Down
Read
Write
Selected, Outputs Disabled
Mode
Power
Standby (I
SB
)
Active (I
CC
)
Active (I
CC
)
Active (I
CC
)
Notes:
12. Data I/O is high-impedance if OE = V
IH
.
13. If CE goes HIGH simultaneously with WE going HIGH, the output remains in a high-impedance state.
14. During this period the I/Os are in the output state and input signals should not be applied.
6
WEIDA [ WEIDA SEMICONDUCTOR, INC. ]
