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ManualsBrandsUnbranded ManualsLogic ICsLogic IC - Receiver, transceiver DIP 14
123
5-1
FAST AND LS TTL DATA
QUAD BUS TRANSCEIVER
The SN54/74LS242 and SN54/74LS243 are Quad Bus Transmitters/Re-
ceivers designed for 4-line asynchronous 2-way data communications
between data buses.
• Hysteresis at Inputs to Improve Noise Immunity
• 2-Way Asynchronous Data Bus Communication
• Input Clamp Diodes Limit High-Speed Termination Effects
LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)
14 13 12 11 10 9
123456
8
7
V
CC
GBA NC 1B 2B 3B 4B
G
BA NC 1A 2A 3A 4A GND
SN54/74LS242
SN54/74LS243
14 13 12 11 10 9
123456
8
7
V
CC
GBA NC 1B 2B 3B 4B
G
BA NC 1A 2A 3A 4A GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
TRUTH TABLES
SN54/74LS242
INPUTS
OUTPUT
INPUTS
OUTPUT
GAB D
OUTPUT
GAB D
OUTPUT
L L H L X (Z)
L H L H L H
H X (Z) H H L
SN54/74LS243
INPUTS
OUTPUT
INPUTS
OUTPUT
GAB D
OUTPUT
GAB D
OUTPUT
L L L L X (Z)
L H H H L H
H X (Z) H H L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
SN54/74LS242
SN54/74LS243
QUAD BUS TRANSCEIVER
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14
1
14
1
14
1
D SUFFIX
SOIC
CASE 751A-02

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