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MM74HC242 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # MM74HC242
Description  Inverting Quad TRI-STATE Transceiver
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

MM74HC242 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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TLL5019
January 1988
MM54HC242MM74HC242
Inverting Quad TRI-STATE
Transceiver
MM54HC243MM74HC243 Quad TRI-STATE Transceiver
General Description
These TRI-STATE bidirectional inverting and non-inverting
buffers utilize advanced silicon-gate CMOS technology and
are intended for two-way asynchronous communication be-
tween data buses They have high drive current outputs
which enable high speed operation when driving large bus
capacitances These circuits possess the low power dissi-
pation and high noise immunity associated with CMOS cir-
cuits but speeds comparable to low power Schottky TTL
circuits They can also drive 15 LS-TTL loads
The MM54HC243MM74HC243 is a non-inverting buffer
and the MM54HC242MM74HC242 is an inverting 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 This device does not have
Schmitt trigger inputs
All inputs are protected from damage due to static dis-
charge by diodes to VCC and ground
Features
Y
Typical propagation delay 12 ns
Y
TRI-STATE outputs
Y
Two way asynchronous communication
Y
High output current 6 mA (74HC)
Y
Wide power supply range 2 – 6V
Y
Low quiescent supply current 80 mA (74HC)
Connection Diagrams
Dual-In-Line Package
TLL5019 – 1
Top View
Order Number MM54HC242 or MM74HC242
Dual-In-Line Package
TLL5019 – 2
Top View
Order Number MM54HC243 or MM74HC243
Truth Tables
’HC242
Control Inputs
Data Port Status
GAB
GBA
A
B
H
H
OUTPUT
Input
L
H
Isolated
Isolated
H
L
Isolated
Isolated
L
L
Input
OUTPUT
’HC243
Control Inputs
Data Port Status
GAB
GBA
A
B
H
H
OUTPUT
Input
L
H
Isolated
Isolated
H
L
Isolated
Isolated
L
L
Input
OUTPUT
TRI-STATE
is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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