Oki MSM85C154HVS - Page 133

MSM80C154S/83C154S/85C154HVS
126
PX.X
MSM80C154S
MSM83C154S
OUTPUT
CONTROL
PX.X
INPUT
CONTROL
RXD
TXD
8Q 7Q 6Q 5Q 4Q 3Q 2Q 1Q
8D 7D 6D 5D 4D 3D 2D 1D
OC G
74LS373
QHQGQF QEQDQCQBQA
CLK CK
74LS164
BA
QH
HGFEDCBA
INHIBIT CK
74LS165
CLOCK
SERIAL IN
SHIFT/LOAD
INPUT
OUTPUT
VCC
VCC
74LS126
Figure 4-41 Input/output extension example