CD54HC243 Datasheet, PDF (2/12 Pages) Texas Instruments – High-Speed CMOS Logic Quad-Bus Transceiver with Three-State Outputs

CD54HC243, CD74HC243, CD54HCT243, CD74HCT243
Functional Diagram
‘HC243, ‘HCT243
3
A0
11
B0
4
A1
10
B1
5
A2
9
B2
6
A3
1
OEB
13
OEA
DIRECTION
SELECT LOGIC
8
B3
TRUTH TABLE
HC, HCT243 SERIES
CONTROL INPUTS
DATA PORT STATUS
OEB
OEA
An
Bn
H
H
O
I
L
H
Z
Z
H
L
Z
Z
L
L
I
O
H= High Voltage Level
L= Low Voltage Level
I= Input
O= Output (Same Level as Input)
Z= High Impedance
To prevent excess currents in the High Z modes all I/O terminals should be terminated with 10kΩ
to 1MΩ resistors.
2