© 1999 Fairchild Semiconductor Corporation DS009502 www.fairchildsemi.com
April 1988
Revised July 1999
7
4F243 Q
uad Bus T
r
ansce
iver

wi
th 3-ST
A
T
E
Out
puts
74F243
Quad Bus Transceiver with 3-STATE Outputs
General Description
The 74F243 is a quad bus transmitter/receiver designed for
4-line asynchronous 2-way data communications between
data busses.
Features
a73 2-Way asynchronous data bus communication
a73 Input clamp diodes limit high-speed termination effects

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
IEEE/IEC
Connection Diagram
Truth Table
H = HIGH Voltage Level Z = High Impedance
L = LOW Voltage Level N/A = Not Allowed
Unit Loading/Fan Out
Order Code Package Number Package Description
74F243SC M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Inputs Inputs/Outputs
E
1
E
2
A
n
B
n
L L Input B = A
LHN/AN/A
HLZZ
HHA = B Input
Pin
Description
U.L. Input I
IH
/I
IL
Names HIGH/LOW Output I
OH
/I
OL
E
1
Enable Input (Active LOW) 1.0/1.67 20 µA/−1 mA
E
2
Enable Input (Active HIGH) 1.0/1.67 20 µA/−1 mA
A
n
, B
n
Inputs 3.5/2.67 70 µA/−1.6 mA
Outputs 600/106.6
(80)
−12 mA/64 mA
(48 mA)