Ic Data - Casio I/O-PB-11 Service Manual

6. IC DATA

TC74HC4050AP
(TOP VIEW)
TC74HC02AP
VDD 4Y 4B 4A 3Y 3B
14
13 12 11 10 9
1 3 4 5 6
2
1Y 1A 2A 2B VSS
1B 2Y
(TOP VIEW)
TC74HC139AP
(TOP VIEW)
TC74HC00AP
QUAD 2-INPUT NAND GATE
(TOP VIEW)
TC74HC244AP
3A
8
7
(TOP VIEW)
ENABLE
— 27 —
INPUTS OUTPUTS
SELECT
G B A Y0
H X X H
L L L L
L L H H
L H L H
L H H H
X: Don't care
TC74HCU04AP
HEX INVERTER
(TOP VIEW)
SELECTED
Y1 Y2 Y3 OUTPUT
H H H NONE
H H H Y0
L H H Y1
H L H Y2
H H L Y3