HD74HC242/HD74HC243
Quad. Bus Transceivers (with 3-state outputs)
Quad. Bus Transceivers (with noninverted 3-state outputs)
Description
The HD74HC242 is an inverting buffer and the HD74HC243 is a noninverting buffer. Each device has one
active high enable (GBA), and one active low enable (GAB). GBA enables the A output and
GAB
enables
the B outputs. The device does not have schmitt trigger inputs.
Features
鈥?/div>
High Speed Operation: t
pd
= 10 ns typ (C
L
= 50 pF)
鈥?/div>
High Output Current: Fanout of 15 LSTTL Loads
鈥?/div>
Wide Operating Voltage: V
CC
= 2 to 6 V
鈥?/div>
Low Input Current: 1 碌A(chǔ) max
鈥?/div>
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
HD74HC242
Control inputs
GAB
H
L
H
L
I
O
O
Z
:
:
:
:
GBA
H
H
L
L
Input
Output
Inverting Output
Hight Impedance
Data Port Status
A
O
Z
Z
I
B
I
Z
Z
O
HC74HC243
Data Port Status
A
O
Z
Z
I
B
I
Z
Z
O
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