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74F243
Quad Bus Tr ansceiver with 3-STAT E Outputs
74F243 Quad Bus Transceiver with 3-STATE Outputs
April 1988
Revised July 1999
General Description
The 74F243 is a quad bus transmitter/receiver designed for
4-line asynchronous 2-wa y data communica tions between
data busses.
Features
■ 2-Way asynchronous data bus communication
■ Input cl amp diodes limit high-speed term ination effects
Ordering Code:
Order Code Package Number Package Description
74F243SC M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.
Logic Symbol
IEEE/IEC
Connection Diagram
Truth Table
Inputs Inputs/Outputs
E
L L Input B = A
LHN/AN/A
HLZZ
H = HIGH Voltage Level Z = High Impedance
L = LOW Voltage Level N/A = Not Allowed
HHA = B Input
1
E
2
A
n
B
n
Unit Loading/Fan Out
Pin
Names
E
1
E
2
, BnInputs 3.5/2.67 70 µA/−1.6 mA
A
n
© 1999 Fairchild Semiconductor Corporation DS009502 www.fairchildsemi.com
Description
Enable Input (Active LOW) 1.0/1.67 20 µA/−1 mA
Enable Input (Active HIGH) 1.0/1.67 20 µA/−1 mA
Outputs 600/106.6
U.L.
HIGH/LOW
(80)
Input I
IH/IIL
Output IOH/I
−12 mA/64 mA
(48 mA)
OL
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Absolute Maximum Ratings(Note 1) Recommended Operating
Storage Temperature −65°C to +150°C
74F243
Ambient Temperature under Bias −55°C to +125°C
Junction Temperature under Bias −55°C to +150°C
Pin Potential to Ground Pin −0.5V to +7.0V
V
CC
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
3-STATE Output −0.5V to +5.5V
Current Applied to Output
in LOW State (Max) twice the rated I
ESD Last Passing Voltage (Min) 4000V
OL
Conditions
Free Air Ambient Temperature 0°C to +70°C
Supply Voltage +4.5V to +5.5V
Note 1: Absolute maximum ratings are values beyond which the device
CC
may be damaged or have its useful life impaired. Functional operation
under these conditi ons is not implied.
Note 2: Either voltage limit or curren t limit is sufficient to protect in put s .
(mA)
DC Electrical Characteristics
Symbol Parameter Min Typ Max Units
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
I
BVI
I
BVIT
I
CEX
V
ID
I
OD
I
IL
IIH + I
IIL + I
I
OS
I
CCH
I
CCL
I
CCZ
Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
Input LOW Voltage 0.8 V Recognized as a LOW Signal
Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA
Output HIGH 10% V
Voltage 10% V
5% V
Output LOW 10% V
Voltage
Input HIGH
Current
Input HIGH Current
Breakdown Test
Input HIGH Current
Breakdown (I/O)
Output HIGH
Leakage Current
Input Leakage
Test All Other Pins Grounded
Output Leakage
Circuit Current All Other Pins Grounded
2.4
CC
2.0 IOH = −15 mA (An, Bn)
CC
2.7 IOH = −3 mA (An, Bn)
CC
CC
0.55 V Min IOL = 64 mA (An, Bn)
5.0 µAMaxVIN = 2.7V
7.0 µAMaxVIN = 7.0V (E1, E2)
0.5 mA Max VIN = 5.5V (An, Bn)
50 µAMaxV
4.75 V 0.0
3.75 µA0.0
Input LOW Current −1.0 mA Max VIN = 0.5V (E1, E2)
Output Leakage Current 70 µAMaxV
OZH
Output Leakage Current −1.6 mA Max V
OZL
Output Short-Circuit Current −100 −225 mA Max V
Power Supply Current 64 80 mA Max VO = HIGH
Power Supply Current 64 90 mA Max VO = LOW
Power Supply Current 71 90 mA Max VO = HIGH Z
V
CC
IOH = −3 mA (An, Bn)
VMin
IID = 1.9 µA
V
Conditions
= V
OUT
CC
= 150 mV
IOD
= 2.7V (An, Bn)
OUT
= 0.5V (An, Bn)
OUT
= 0V (An, Bn)
OUT
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AC Electrical Characteristics
Symbol Parameter
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
Propagation Delay 2.5 4.0 5.2 2.0 6.5 2.0 6.2
An to Bn, Bn to A
n
Output Enable Time 2.0 4.3 5.7 2.0 8.0 2.0 6.7
E1 to Bn, E2 to A
n
Output Disable Time 2.0 4.5 6.0 1.5 7.5 1.5 7.0
E1 to Bn, E2 to A
n
TA = +25°CT
= −55°C to +125°CTA = 0°C to +70°C
A
VCC = +5.0V VCC = 5.0V VCC = 5.0V
CL = 50 pF CL = 50 pF CL = 50 pF
Min Typ Max Min Max Min Max
2.5 4.0 5.2 2.0 8.5 2.0 6.5
2.0 5.8 7.5 2.0 10.5 2.0 8.5
2.0 4.5 6.0 2.0 8.5 2.0 7.0
74F243
Units
ns
ns
3 www.fairchildsemi.com
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Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Package Number M14A
74F243 Quad Bus Transceive r with 3- STATE Outputs
Fairchild does not assume any responsibility for us e 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 syste ms
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 reasonably expected to result in a significan t injury to the
user.
2. A critical component in any compon ent of a lif e supp ort
device or system whose failu re to perform can be reasonably expected to ca use the fa i lure of the li fe su pp ort
device or system, or to affect its safety or effectiveness.
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