74F243 Quad Bus Transceiver with 3-STATE Outputs
April 1988
Revised July 1999
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:
Order Code
74F243SC
Package Number
M14A
Package Description
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
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
Inputs
E
1
L
L
H
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
Z
=
High Impedance
N/A
=
Not Allowed
Inputs/Outputs
E
2
L
H
L
H
A
n
Input
N/A
Z
A
=
B
B
n
B
=
A
N/A
Z
Input
Unit Loading/Fan Out
Pin
Description
Names
E
1
E
2
A
n
, B
n
Enable Input (Active LOW)
Enable Input (Active HIGH)
Inputs
Outputs
1.0/1.67
1.0/1.67
3.5/2.67
U.L.
Input I
IH
/I
IL
HIGH/LOW Output I
OH
/I
OL
20
µA/−1
mA
20
µA/−1
mA
70
µA/−1.6
mA
600/106.6
−12
mA/64 mA
(80)
(48 mA)
© 1999 Fairchild Semiconductor Corporation
DS009502
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74F243
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Output
in HIGH State (with V
CC
=
0V)
Standard Output
3-STATE Output
Current Applied to Output
in LOW State (Max)
ESD Last Passing Voltage (Min)
twice the rated I
OL
(mA)
4000V
−0.5V
to V
CC
−0.5V
to
+5.5V
−65°C
to
+150°C
−55°C
to
+125°C
−55°C
to
+150°C
−0.5V
to
+7.0V
−0.5V
to
+7.0V
−30
mA to
+5.0
mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to
+70°C
+4.5V
to
+5.5V
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
Symbol
V
IH
V
IL
V
CD
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
V
OL
I
IH
I
BVI
I
BVIT
I
CEX
V
ID
I
OD
I
IL
I
IH
+
I
OZH
I
IL
+
I
OZL
I
OS
I
CCH
I
CCL
I
CCZ
Output LOW
Voltage
Input HIGH
Current
Input HIGH Current
Breakdown Test
Input HIGH Current
Breakdown (I/O)
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Power Supply Current
Power Supply Current
Power Supply Current
−100
64
64
71
4.75
3.75
−1.0
70
−1.6
−225
80
90
90
10% V
CC
10% V
CC
5% V
CC
10% V
CC
2.4
2.0
2.7
0.55
5.0
V
µA
µA
mA
µA
V
µA
mA
µA
mA
mA
mA
mA
mA
Min
Max
V
Min
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
Min
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
I
IN
= −18
mA
I
OH
= −3
mA (A
n
, B
n
)
I
OH
= −15
mA (A
n
, B
n
)
I
OH
= −3
mA (A
n
, B
n
)
I
OL
=
64 mA (A
n
, B
n
)
V
IN
=
2.7V
V
IN
=
7.0V (E
1
, E
2
)
V
IN
=
5.5V (A
n
, B
n
)
V
OUT
=
V
CC
I
ID
=
1.9
µA
All Other Pins Grounded
V
IOD
=
150 mV
All Other Pins Grounded
V
IN
=
0.5V (E
1
, E
2
)
V
OUT
=
2.7V (A
n
, B
n
)
V
OUT
=
0.5V (A
n
, B
n
)
V
OUT
=
0V (A
n
, B
n
)
V
O
=
HIGH
V
O
=
LOW
V
O
=
HIGH Z
7.0
0.5
50
Max
Max
Max
0.0
0.0
Max
Max
Max
Max
Max
Max
Max
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2
74F243
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A
n
to B
n
, B
n
to A
n
Output Enable Time
E
1
to B
n
, E
2
to A
n
Output Disable Time
E
1
to B
n
, E
2
to A
n
2.5
2.5
2.0
2.0
2.0
2.0
V
CC
= +5.0V
C
L
=
50 pF
Typ
4.0
4.0
4.3
5.8
4.5
4.5
Max
5.2
5.2
5.7
7.5
6.0
6.0
T
A
= −55°C
to
+125°C
V
CC
=
5.0V
C
L
=
50 pF
Min
2.0
2.0
2.0
2.0
1.5
2.0
Max
6.5
8.5
8.0
10.5
7.5
8.5
T
A
=
0°C to
+70°C
V
CC
=
5.0V
C
L
=
50 pF
Min
2.0
2.0
2.0
2.0
1.5
2.0
Max
6.2
6.5
6.7
8.5
7.0
7.0
ns
ns
Units
3
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74F243 Quad Bus Transceiver with 3-STATE Outputs
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.
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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.
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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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