TL/F/9502
54F/74F243 Quad Bus Transceiver with TRI-STATE Outputs
November 1994
54F/74F243
Quad Bus Transceiver with TRI-STATEÉOutputs
General Description
The ’F243 is a quad bus transmitter/receiver designed for
4-line asynchronous 2-way data communications between
data busses.
Features
Y2-Way asynchronous data bus communication
YInput clamp diodes limit high-speed termination effects
YGuaranteed 4000V minimum ESD protection
Commercial Military Package Package Description
Number
54F243DM (Note 2) J14A 14-Lead Ceramic Dual-In-Line
74F243SC (Note 1) M14A 14-Lead (0.150×Wide) Molded Small Outline, JEDEC
54F243FM (Note 2) W14B 14-Lead Cerpack
54F243LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C
Note 1: Devices also available in 13×reel. Use Suffix eSCX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix eDMQB, FMQB and LMQB.
Logic Symbol
IEEE/IEC
TL/F/9502–3
Connection Diagrams
Pin Assignment
for DIP, SOIC and Flatpak
TL/F/9502–1
Pin Assignment
for LCC
TL/F/9502–2
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
Unit Loading/Fan Out
54F/74F
Pin Names Description U.L. Input IIH/IIL
HIGH/LOW Output IOH/IOL
E1Enable Input (Active LOW) 1.0/1.67 20 mA/b1mA
E
2Enable Input (Active HIGH) 1.0/1.67 20 mA/b1mA
A
n
,B
nInputs 3.5/2.67 70 mA/b1.6 mA
Outputs 600/106.6(80) b12 mA/64 mA(48 mA)
Truth Table
Inputs Inputs/Outputs
E1E2AnBnHeHIGH Voltage Level
LeLOW Voltage Level
L L Input B eAZeHigh Impedance
N/A eNot Allowed
L H N/A N/A
HL Z Z
HHA
e
B Input
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Storage Temperature b65§Ctoa
150§C
Ambient Temperature under Bias b55§Ctoa
125§C
Junction Temperature under Bias b55§Ctoa
175§C
Plastic b55§Ctoa
150§C
VCC Pin Potential to
Ground Pin b0.5V to a7.0V
Input Voltage (Note 2) b0.5V to a7.0V
Input Current (Note 2) b30 mA to a5.0 mA
Voltage Applied to Output
in HIGH State (with VCC e0V)
Standard Output b0.5V to VCC
TRI-STATE Output b0.5V to a5.5V
Current Applied to Output
in LOW State (Max) twice the rated IOL (mA)
ESD Last Passing Voltage (Min) 4000V
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.
Recommended Operating
Conditions
Free Air Ambient Temperature
Military b55§Ctoa
125§C
Commercial 0§Ctoa
70§C
Supply Voltage
Military a4.5V to a5.5V
Commercial a4.5V to a5.5V
DC Electrical Characteristics
Symbol Parameter 54F/74F Units VCC Conditions
Min Typ Max
VIH Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
VIL Input LOW Voltage 0.8 V Recognized as a LOW Signal
VCD Input Clamp Diode Voltage b1.2 V Min IIN eb
18 mA
VOH Output HIGH 54F 10% VCC 2.4 IOH eb
3mA(A
n
,B
n
)
Voltage 54F 10% VCC 2.0 IOH eb
12 mA (An,B
n
)
74F 10% VCC 2.4 V Min IOH eb
3mA(A
n
,B
n
)
74F 10% VCC 2.0 IOH eb
15 mA (An,B
n
)
74F 5% VCC 2.7 IOH eb
3mA(A
n
,B
n
)
V
OL Output LOW 54F 10% VCC 0.55 V Min IOL e48 mA (An,B
n
)
Voltage 74F 10% VCC 0.55 IOL e64 mA (An,B
n
)
I
IH Input HIGH 54F 20.0 mA Max VIN e2.7V
Current 74F 5.0
IBVI Input HIGH Current 54F 100 mA Max VIN e7.0V (E1,E
2
)
Breakdown Test 74F 7.0
IBVIT Input HIGH Current 54F 1.0 mA Max VIN e5.5V (An,B
n
)
Breakdown (I/O) 74F 0.5
ICEX Output HIGH 54F 250 mA Max VOUT eVCC
Leakage Current 74F 50
VID Input Leakage 74F 4.75 V 0.0 IID e1.9 mA
Test All Other Pins Grounded
IOD Output Leakage 74F 3.75 mA 0.0 VIOD e150 mV
Circuit Current All Other Pins Grounded
IIL Input LOW Current b1.0 mA Max VIN e0.5V (E1,E
2
)
I
IH aIOZH Output Leakage Current 70 mA Max VOUT e2.7V (An,B
n
)
I
IL aIOZL Output Leakage Current b1.6 mA Max VOUT e0.5V (An,B
n
)
I
OS Output Short-Circuit Current b100 b225 mA Max VOUT e0V (An,B
n
)
I
CCH Power Supply Current 64 80 mA Max VOeHIGH
ICCL Power Supply Current 64 90 mA Max VOeLOW
ICCZ Power Supply Current 71 90 mA Max VOeHIGH Z
3
AC Electrical Characteristics
74F 54F 74F
TAea
25§CTA,V
CC eMil TA,V
CC eCom
Symbol Parameter VCC ea
5.0V CLe50 pF CLe50 pF Units
CLe50 pF
Min Typ Max Min Max Min Max
tPLH Propagation Delay 2.5 4.0 5.2 2.0 6.5 2.0 6.2 ns
tPHL Anto Bn,B
nto An2.5 4.0 5.2 2.0 8.5 2.0 6.5
tPZH Output Enable Time 2.0 4.3 5.7 2.0 8.0 2.0 6.7
tPZL E1to Bn,E
2to An2.0 5.8 7.5 2.0 10.5 2.0 8.5 ns
tPHZ Output Disable Time 2.0 4.5 6.0 1.5 7.5 1.5 7.0
tPLZ E1to Bn,E
2to An2.0 4.5 6.0 2.0 8.5 2.0 7.0
Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
74F 243 S C X
Temperature Range Family Special Variations
74F eCommercial QB eMilitary grade device with
54F eMilitary environmental and burn-in
processing
Device Type XeDevices shipped in 13×reel
Package Code Temperature Range
DeCeramic DIP CeCommercial (0§Ctoa
70§C)
FeFlatpak MeMilitary (b55§Ctoa
125§C)
LeLeadless Chip Carrier (LCC)
SeSmall Outline SOIC JEDEC
Physical Dimensions inches (millimeters)
20-Lead Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
4
Physical Dimensions inches (millimeters) (Continued)
14-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J14A
14-Lead (0.150×Wide) Molded Small Outline Package, JEDEC (S)
NS Package Number M14A
5
54F/74F243 Quad Bus Transceiver with TRI-STATE Outputs
Physical Dimensions inches (millimeters) (Continued)
14-Lead Ceramic Flatpak (F)
NS Package Number W14B
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SEMICONDUCTOR CORPORATION. As used herein:
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systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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