SN74LS243DW 查看數據表（PDF） - Motorola => Freescale
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SN74LS243DW Datasheet PDF : 5 Pages
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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)
SN54 / 74LS242
VCC GBA NC 1B 2B 3B 4B
14 13 12 11 10 9
8
1
2
3
4
5
6
7
GBA NC 1A 2A 3A 4A GND
SN54 / 74LS243
VCC GBA NC 1B 2B 3B 4B
14 13 12 11 10 9
8
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
1
2
3
4
5
6
7
GBA NC 1A 2A 3A 4A GND
SN54/74LS242
SN54/74LS243
QUAD BUS TRANSCEIVER
LOW POWER SCHOTTKY
14
1
J SUFFIX
CERAMIC
CASE 632-08
14
1
14
1
N SUFFIX
PLASTIC
CASE 646-06
D SUFFIX
SOIC
CASE 751A-02
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
INPUTS
GAB D
L
L
L
H
H
X
SN54 / 74LS242
OUTPUT
INPUTS
GAB D
H
L
X
L
H
L
(Z)
H
H
TRUTH TABLES
OUTPUT
INPUTS
GAB D
(Z)
L
L
H
L
H
L
H
X
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
SN54/74LS243
OUTPUT
INPUTS
GAB D
L
L
X
H
H
L
(Z)
H
H
OUTPUT
(Z)
H
L
FAST AND LS TTL DATA
5-393
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