General Description
Features
The DS75121 is a monolithic dual line driver designed to
drive long lengths of coaxial cable, strip line, or twisted pair
transmission lines having impedances from 50Ω to 500Ω. It
is compatible with standard TTL logic and supply voltage levels.
The DS75121 will drive terminated low impedance lines due
to the low-impedance emitter-follower outputs. In addition
the outputs are uncommitted allowing two or more drivers to
drive the same line.
Output short-circuit protection is incorporated to turn off the
output when the output voltage drops below approximately
1.5V.
n Designed for digital data transmission over 50Ω to 500Ω
coaxial cable, strip line, or twisted pair transmission
lines
n TTL compatible
n Open emitter-follower output structure for party-line
operation
n Short-circuit protection
n AND-OR logic configuration
n High speed (max propagation delay time 20 ns)
n Plug-in replacement for the SN75121 and the 8T13
Connection Diagram
Typical Performance
Characteristics
Deal-In-Line Package
DS75121
DS75121
Dual Line Drivers
DS75121 Dual Line Drivers
March 1992
DS005788-2
DS005788-1
Truth Table
Top View
Order Number DS75121N
See NS Package Number N16A
Inputs
Output
A
B
C
D
E
F
Y
H
H
H
H
X
X
H
X
X
X
X
H
H
H
All Other Input
L
Combinations
H = High Level, L = Low Level, X = Irrelevant
© 1997 National Semiconductor Corporation
www.national.com
DS005788
PrintDate=1997/04/28 PrintTime=10:12:52 6137 ds005788 Rev. No. 1
Proof
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1
AC Test Circuit and Switching Time Waveforms
DS005788-4
DS005788-3
Note 1: The pulse generators have the following characteristics:
ZOUT ≈ 50Ω, tW = 200 ns, duty cycle = 50%, tr, = tf = 5.0 ns.
Note 2: CL includes probe and jig capacitance.
www.national.com
PrintDate=1997/04/28 PrintTime=10:12:53 6137 ds005788 Rev. No. 1
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Proof
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Absolute Maximum Ratings
(Note 4)
Lead Temperature (Soldering, 4 seconds)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, VCC
Input Voltage
Output Voltage
Output Current
Maximum Power Dissipation (Note 3) at 25˚C
Molded Package
260˚C
Operating Conditions
6.0V
6.0V
6.0V
−75 mA
Supply Voltage, VCC
Temperature, TA
DS75121
Min
4.75
Max
5.25
Units
V
0
+75
˚C
Note 3: Derate molded package 10.2 n/w/˚C above 25˚C.
1280 mW
Electrical Characteristics
(Notes 5, 6)
VCC = 4.75V to 5.25V (unless otherwise noted)
Symbol
Parameter
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
Conditions
VI
Input Clamp Voltage
Input Current at Max Input Voltage
VOH
High Level Output Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
IO(OFF)
Off State Output Current
IIH
High Level Input Current
IIL
Low Level Input Current
IOS
Short Circuit Output Current
Supply Current, Outputs High
ICCL
Supply Current, Outputs Low
Typ
Max
Units
0.8
V
2.0
II
ICCH
Min
VCC = 5.0V, II = −12 mA
VCC = 5.25V, VIN = 5.5V
VIH = 2.0V, IOH = −75 mA (Note 7)
VCC = 5.0V, VIH = 4.75V, VOH = 2.0V,
V
V
1
mA
2.4
V
−100
−250
TA = 25˚C (Note 7)
VIL = 0.8V, VOL = 0.4V (Note 7)
VCC = 0V, VO = 3.0V
VI = 4.5V
VI = 0.4V
VCC = 5.0V, TA = 25˚C
VCC = 5.25V, All Inputs at 2.0V, Outputs Open
VCC = 5.25V, All Inputs at 0.8V, Outputs Open
−1.5
−0.1
mA
−800
µA
500
µA
40
µA
−1.6
mA
−30
mA
28
mA
60
mA
Switching Characteristics
VCC = 5.0V, TA = 25˚C
Symbol
tPLH
Parameter
Min
Propagation Delay Time,
and Switching Time Waveforms)
RL = 37Ω, (See AC Test Circuit
High-to-Low Level Output
and Switching Time Waveforms)
CL = 1000 pF
Low-to-High Level Output
tPHL
Conditions
RL = 37Ω, (See AC Test Circuit
CL = 15 pF
CL = 1000 pF
CL = 15 pF
Propagation Delay Time,
Typ
Max
Units
11
20
ns
22
50
ns
8.0
20
ns
20
50
ns
Note 4: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” they
are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation.
Note 5: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS75121. All typical values are for TA = 25˚C and VCC = 5V.
Note 6: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown
as max or min on absolute value basis.
Note 7: The output voltage and current limits are guaranteed for any appropriate combination of high and low inputs specified by the truth table for the desired output.
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PrintDate=1997/04/28 PrintTime=10:12:55 6137 ds005788 Rev. No. 1
Book
Extract
End
www.national.com
Proof
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DS75121 Dual Line Drivers
Physical Dimensions
inches (millimeters)
Molded Dual-In-Line Packge (N)
Order Number DS75121N
NS Package Number N16A
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NATIONAL’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 NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into
sonably expected to cause the failure of the life support
the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness.
ure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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PrintDate=1997/04/28 PrintTime=10:12:55 6137 ds005788 Rev. No. 1
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