HD74HCT242 Datasheet, PDF (1/8 Pages) Hitachi Semiconductor – Quad. Bus Transceivers (with 3-state outputs)

HD74HCT242/HD74HCT243
Quad. Bus Transceivers (with 3-state outputs)
Description
The HD74HCT242 is an inverting buffer and the HD74HCT243 is a noninverting buffer. Each device has
one active high enable (GBA), and one active low enable (GAB). GBA enables the A outputs and GAB
enables the B outputs.
The device does not have schmitt trigger inputs.
Features
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: t_pd (A to Y) = 9.5 ns typ (C_L = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: V_CC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I_CC (static) = 4 µA max (Ta = 25°C)
Function Table
Control Inputs
G_AB
H
G_BA
H
L
H
H
L
L
L
I : Input
O : Output
O : Inverting Output
Z : High Impedance
HD74HCT242
Data Port Status
A
B
O
I
Z
Z
Z
Z
I
O
HD74HCT243
Data Port Status
A
B
O
I
Z
Z
Z
Z
I
O