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
s
2-Way asynchronous data bus communication
s
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
L
H
N/A
N/A
H
L
Z
Z
H
H
A
=
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
A/
-
1 mA
E
2
Enable Input (Active HIGH)
1.0/1.67
20
A/
-
1 mA
A
n
, B
n
Inputs
3.5/2.67
70
A/
-
1.6 mA
Outputs
600/106.6
(80)
-
12 mA/64 mA
(48 mA)
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2
74F243
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Storage Temperature
-
65
C to
+
150
C
Ambient Temperature under Bias
-
55
C to
+
125
C
Junction Temperature under Bias
-
55
C to
+
150
C
V
CC
Pin Potential to Ground Pin
-
0.5V to
+
7.0V
Input Voltage (Note 2)
-
0.5V to
+
7.0V
Input Current (Note 2)
-
30 mA to
+
5.0 mA
Voltage Applied to Output
in HIGH State (with V
CC
=
0V)
Standard Output
-
0.5V to V
CC
3-STATE Output
-
0.5V to
+
5.5V
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
ESD Last Passing Voltage (Min)
4000V
Free Air Ambient Temperature
0
C to
+
70
C
Supply Voltage
+
4.5V to
+
5.5V
Symbol
Parameter
Min
Typ
Max
Units
V
CC
Conditions
V
IH
Input HIGH Voltage
2.0
V
Recognized as a HIGH Signal
V
IL
Input LOW Voltage
0.8
V
Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage
-
1.2
V
Min
I
IN
=
-
18 mA
V
OH
Output HIGH
10% V
CC
2.4
V
Min
I
OH
=
-
3 mA (A
n
, B
n
)
Voltage
10% V
CC
2.0
I
OH
=
-
15 mA (A
n
, B
n
)
5% V
CC
2.7
I
OH
=
-
3 mA (A
n
, B
n
)
V
OL
Output LOW
10% V
CC
0.55
V
Min
I
OL
=
64 mA (A
n
, B
n
)
Voltage
I
IH
Input HIGH
5.0
A
Max
V
IN
=
2.7V
Current
I
BVI
Input HIGH Current
7.0
A
Max
V
IN
=
7.0V (E
1
, E
2
)
Breakdown Test
I
BVIT
Input HIGH Current
0.5
mA
Max
V
IN
=
5.5V (A
n
, B
n
)
Breakdown (I/O)
I
CEX
Output HIGH
50
A
Max
V
OUT
=
V
CC
Leakage Current
V
ID
Input Leakage
4.75
V
0.0
I
ID
=
1.9
A
Test
All Other Pins Grounded
I
OD
Output Leakage
3.75
A
0.0
V
IOD
=
150 mV
Circuit Current
All Other Pins Grounded
I
IL
Input LOW Current
-
1.0
mA
Max
V
IN
=
0.5V (E
1
, E
2
)
I
IH
+
I
OZH
Output Leakage Current
70
A
Max
V
OUT
=
2.7V (A
n
, B
n
)
I
IL
+
I
OZL
Output Leakage Current
-
1.6
mA
Max
V
OUT
=
0.5V (A
n
, B
n
)
I
OS
Output Short-Circuit Current
-
100
-
225
mA
Max
V
OUT
=
0V (A
n
, B
n
)
I
CCH
Power Supply Current
64
80
mA
Max
V
O
=
HIGH
I
CCL
Power Supply Current
64
90
mA
Max
V
O
=
LOW
I
CCZ
Power Supply Current
71
90
mA
Max
V
O
=
HIGH Z
3
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7
4F243
AC Electrical Characteristics
Symbol
Parameter
T
A
=
+
25
C
T
A
=
-
55
C to
+
125
C
T
A
=
0
C to
+
70
C
Units
V
CC
=
+
5.0V
V
CC
=
5.0V
V
CC
=
5.0V
C
L
=
50 pF
C
L
=
50 pF
C
L
=
50 pF
Min
Typ
Max
Min
Max
Min
Max
t
PLH
Propagation Delay
2.5
4.0
5.2
2.0
6.5
2.0
6.2
ns
t
PHL
A
n
to B
n
, B
n
to A
n
2.5
4.0
5.2
2.0
8.5
2.0
6.5
t
PZH
Output Enable Time
2.0
4.3
5.7
2.0
8.0
2.0
6.7
ns
t
PZL
E
1
to B
n
, E
2
to A
n
2.0
5.8
7.5
2.0
10.5
2.0
8.5
t
PHZ
Output Disable Time
2.0
4.5
6.0
1.5
7.5
1.5
7.0
t
PLZ
E
1
to B
n
, E
2
to A
n
2.0
4.5
6.0
2.0
8.5
2.0
7.0
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4
74F243 Quad
Bus T
r
an
sceive
r
wi
th 3-
S
T
A
T
E O
u
t
puts
Physical Dimensions
inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Package Number M14A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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