Document #: 38-05460 Rev. *G Page 8 of 13
Write Cycle No. 3 (WE Controlled, OE LOW)
Truth Table
CE OE WE BLE BHE I/O
0
–I/O
7
I/O
8
–I/O
15
Mode Power
H X X X X High-Z High-Z Power-down Standby (I
SB
)
L L H L L Data Out Data Out Read – All bits Active (I
CC
)
L H Data Out High-Z Read – Lower bits only Active (I
CC
)
H L High-Z Data Out Read – Upper bits only Active (I
CC
)
L X L L L Data In Data In Write – All bits Active (I
CC
)
L H Data In High-Z Write – Lower bits only Active (I
CC
)
H L High-Z Data In Write – Upper bits only Active (I
CC
)
L H H X X High-Z High-Z Selected, outputs disabled Active (I
CC
)
L X X H H High-Z High-Z Selected, outputs disabled Active (I
CC
)
Switching Waveforms (continued)
OE
t
HD
t
SD
t
SCE
t
HA
t
AW
t
PWE
t
WC
t
BW
t
SA
t
LZWE
t
HZWE
DATA I/O
ADDRESS
CE
WE
BHE,BLE
DATA IN VALID
