DS55107/DS75107/DS75108/DS75208
Dual Line Receivers
DS55107/DS75107/DS75108/DS75208 Dual Line Receivers
January 1996
General Description
The products described herein are TTL compatible dual
high speed circuits intended for sensing in a broad range of
system applications. While the primary usage will be for line
receivers of MOS sensing, any of the products may effectively be used as voltage comparators, level translators,
window detectors, transducer preamplifiers, and in other
sensing applications. As digital line receivers the products
are applicable with the SN55109/SN75109 and mA75110/
DS75110 companion drivers, or may be used in other balanced or unbalanced party-line data transmission systems.
The improved input sensitivity and delay specifications of
the DS75208 make it ideal for sensing high performance
MOS memories as well as high sensitivity line receivers and
voltage comparators.
Input protection diodes are incorporated in series with the
collectors of the differential input stage. These diodes are
Connection Diagram
Dual-In-Line Package
useful in certain applications that have multiple V
plies or V
a
supplies that are turned off.
CC
CC
Features
Y
Diode protected input stage for power ‘‘OFF’’ condition
Y
17 ns typ high speed
Y
TTL compatible
Y
g
10 mV org25 mV input sensitivity
Y
g
3V input common-mode range
Y
High input impedance with normal VCC,orV
Y
Strobes for channel selection
Y
Dual circuits
Y
Sensitivity gntd. over full common-mode range
Y
Logic input clamp diodesÐmeets both ‘‘A’’ and ‘‘B’’
version specifications
Y
g
5V standard supply voltages
CC
e
a
sup-
0V
Top View
Order Number DS75107M, DS75107N, DS75107AM, DS75107AN,
DS75108M, DS75108N or DS75208N
See NS Package Number M14A or N14A
For Complete Military 883 Specifications, see RETS Datasheet.
Order Number DS55107AJ/883
See NS Package Number J14A
Selection Guide
Temperature
Package
Input Sensitivity
Output Logic
b
x
55§CsT
x
x
v
s
a
125§C0§CsT
A
Cavity Dip Cavity or Molded Dip
g
25 mV
g
TTL Active Pull-Up DS55107 DS75107
TTL Open Collector DS75108 DS75208
C
1996 National Semiconductor Corporation RRD-B30M36/Printed in U. S. A.
TL/F/9446
s
A
25 mVg10 mV
TL/F/9446– 1
a
70§C
http://www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage, V
Supply Voltage, V
Differential Input Voltage
Common Mode Input Voltage
CC
CC
a
b
7V
b
7V
g
6V
g
5V
Strobe Input Voltage 5.5V
Storage Temperature Range
b
65§Ctoa150§C
Maximum Power Dissipation* at 25§C
Cavity Package 1308 mW
Molded Package 1207 mW
Lead Temperature (Soldering, 4 sec) 260
*Derate cavity package 8.7 mW/§C above 25§C; derate molded package 9.7
C above 25§C.
mW/
§
C
§
Operating Conditions
DS55107
Min Nom Max Min Nom Max
Supply Voltage V
Supply Voltage V
Operating Temperature Range
Note 1: ‘‘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 2. Unless otherwise specified min/max limits apply across the
the DS75107, DS75108 and DS75208. All typical values are for T
Note 3: 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.
CC
CC
a
b
4.5V 5V 5.5V 4.75V 5V 5.25V
b
4.5V
b
55§Cto
b
5V
b
55§Ctoa125§C temperature range for the DS55107 and across the 0§Ctoa70§C range for
e
25§C and V
A
b
5.5V
a
125§C0
e
5V.
CC
b
4.75V
Cto
§
DS75107,
DS75108, DS75208
b
5V
b
5.25V
a
70§C
DS55107/DS75107, DS75108
s
Electrical Characteristics
T
MIN
Symbol Parameter Conditions Min Typ Max Units
I
IH
I
IL
I
IH
IILLow Level Input Current V
I
IH
IILLow Level Input Current into S V
V
V
I
OH
I
OS
I
CCH
I
CCH
V
High Level Input Current V
into A1, B1, A2 or B2 V
Low Level Input Current V
into A1, B1, A2 or B2 V
High Level Input Current V
into G1 or G2 V
into G1 or G2 V
High Level Input Current into S V
High Level Output Voltage V
OH
Low Level Output Voltage V
OL
High Level Output Current V
Short Circuit Output Current V
High Logic Level Supply V
a
Current from V
High Logic Level Supply V
b
Current from V
Input Clamp Voltage on G or S V
I
CC
CC
CC
ID
CC
ID
CC
CC
CC
IL(S)
CC
V
CC
CC
V
IL(S)
CC
I
LOAD
V
IC
CC
I
SINK
V
IC
CC
V
OH
CC
(Notes 2 and 3)
CC
V
ID
CC
V
ID
CC
I
IN
s
T
T
A
MAX
e
Max, V
a
e
0.5V, V
e
a
eb
2V, V
e
a
e
b
e
a
e
0.4V
e
a
e
b
e
a
e
0.4V
e
a
eb
eb
3V to 3V, (Note 3)
e
a
e
16 mA, V
eb
3V to 3V
e
a
e
Max V
e
a
e
a
e
25 mV, T
e
a
e
25 mV, T
e
a
eb
12 mA, T
b
CC
eb
IC
Max, V
b
CC
eb
IC
Max, V
Max
Max, V
b
CC
Max, V
Max
Max, V
b
CC
Min, V
b
CC
400 mA, V
Min, V
b
CC
ID
Min, V
b
CC
, (Note 4)
a
CC
Max, V
b
CC
Max, V
b
CC
e
A
Max, V
b
CC
e
A
Min, V
b
CC
e
A
(Notes 2, 3)
e
Max,
3V to 3V
e
Max,
3V to 3V
e
2.4V 40 mA
IH(S)
V
Max V
e
e
e
ID
e
eb
e
e
e
25§C
e
25§C
e
25§C
Max,
Max,
Min,
e
Min,
Min
Max,
Max,
Max,
Min,
IH(S)
IH(S)
V
IH(S)
25 mV, 2.4 V
25 mV, 0.4 V
a
CC
e
2.4V 80 mA
e
Max V
a
CC
b
18
b
30 75 mA
18 30 mA
8.4b15 mA
b1b
b
10 mA
1mA
b
1.6 mA
2mA
b
3.2 mA
250 mA
b
70 mA
1.5 V
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Switching Characteristics V
CC
e
5V, V
a
CC
b
eb
5V, T
e
25§C
A
Symbol Parameter Conditions Min Typ Max Units
t
PLH(D)
Propagation Delay Time, Low to R
High Level, from Differential (Note 1)
L
e
390X,C
Inputs A and B to Output
t
PHL(D)
Propagation Delay Time, High to R
Low Level, from Differential (Note 1)
L
e
390X,C
Inputs A and B to Output
t
PLH(S)
Propagation Delay Time, Low to R
High Level, from Strobe Input G
L
e
390X,C
or S to Output
t
PHL(S)
Propagation Delay Time, High to R
Low Level, from Strobe Input G
L
e
390X,C
or S to Output
Note 1: Differential input isa100 mV tob100 mV pulse. Delays read from 0 mV on input to 1.5V on output.
Note 2: Only one output at a time should be shorted.
Note 3: DS55107/DS75107 only.
Note 4: DS75108 only.
e
50 pF, (Note 3) 17 25 ns
L
(Note 4) 19 25 ns
e
50 pF, (Note 3) 17 25 ns
L
(Note 4) 19 25 ns
e
50 pF (Note 3) 10 15 ns
L
(Note 4) 13 20 ns
e
50 pF (Note 3) 8 15 ns
L
(Note 4) 13 20 ns
DS75208
s
CC
ID
CC
ID
CC
CC
CC
IL(S)
CC
V
CC
CC
V
IL(S)
CC
I
SINK
V
IC
CC
V
OH
CC
V
ID
CC
V
ID
CC
I
IN
A
a
e
a
eb
a
b
a
e
a
b
a
e
a
e
eb
a
e
a
e
a
e
a
eb
a
70§C
e
Max, V
0.5V, V
e
Max, V
2V, V
e
Max, V
e
Max
e
Max, V
0.4V
e
Max, V
e
Max
e
Max, V
0.4V
e
Min, V
16 mA, V
3V to 3V
e
Min, V
Max V
e
Max, V
10 mV, T
e
Max, V
10 mV, T
e
Min, V
12 mA, T
IC
IC
CC
e
Max,
b
CC
eb
3V to 3V
e
Max,
b
CC
eb
3V to 3V
e
2.4V 40 mA
IH(S)
e
Max V
V
IH(S)
e
Max,
b
CC
e
IH(S)
e
V
IH(S)
e
Max,
b
CC
e
Min,
b
CC
eb
10 mV, 0.4 V
ID
e
Min,
b
CC
a
e
Max,
b
CC
e
25§C
A
e
Max,
b
CC
e
25§C
A
e
Min,
b
CC
e
25§C
A
a
CC
2.4V 80 mA
Max V
a
CC
30 75 mA
18 30 mA
b
8.4
b
1
b
b
b
250 mA
b
b
10 mA
1mA
1.6 mA
2mA
3.2 mA
15 mA
1.5 V
Electrical Characteristics
0§CsT
Symbol Parameter Conditions Min Typ Max Units
I
IH
I
IL
I
IH
High Level Input Current V
into A1, B1, A2 or B2 V
Low Level Input Current V
into A1, B1, A2 or B2 V
High Level Input Current V
into G1 or G2 V
IILLow Level Input Current V
into G1 or G2 V
I
IH
High Level Input Current into S V
IILLow Level Input Current into S V
V
I
OH
I
CCH
I
CCH
V
OL
I
Low Level Output Voltage V
High Level Output Current V
High Logic Level Supply V
a
Current from V
High Logic Level Supply V
b
Current from V
CC
CC
a
b
Input Clamp Voltage on G or S V
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Switching Characteristics V
CC
e
5V, V
a
CC
b
eb
5V, T
e
25§C
A
Symbol Parameter Conditions Min Typ Max Units
t
PLH(D)
Propagation Delay Time, Low-to- R
High Level, from Differential 35 ns
e
L
470X,C
e
15 pF, (Note 1)
L
Inputs A and B to Output
t
PHL(D)
Propagation Delay Time, High-to- R
Low Level, from Differential 20 ns
e
L
470X,C
e
15 pF, (Note 1)
L
Inputs A and B to Output
t
PLH(S)
Propagation Delay Time, Low-to- R
High Level, from Strobe Input G 17 ns
e
L
470X,C
e
15 pF
L
or S to Output
t
PHL(S)
Propagation Delay Time, High-to- R
Low Level, from Strobe Input G 17 ns
e
L
470X,C
e
15 pF
L
or S to Output
Note 1: Differential input isa10 mV tob30 mV pulse. Delays read from 0 mV on input to 1.5V on output.
Voltage Waveforms
Typical Applications
Basic Balanced-Line Transmission System
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TL/F/9446– 12
TL/F/9446– 2
Typical Applications (Continued)
Data-Bus or Party-Line System
APPLICATION
The DS55107, DS75107 dual line circuits are designed specifically for use in high speed data transmission systems
that utilize balanced, terminated transmission lines such as
twisted-pair lines. The system operates in the balanced
mode, so that noise induced on one line is also induced on
the other. The noise appears common mode at the receiver
input terminals where it is rejected. The ground connection
between the line driver and receiver is not part of the signal
circuit so that system performance is not affected by circulating ground currents.
The unique driver output circuit allows terminated transmission lines to be driven at normal line impedances. High
speed system operation is ensured since line reflections are
virtually eliminated when terminated lines are used. Crosstalk is minimized by low signal amplitudes and low line impedances.
The typical data delay in a system is approximately (30
1.3L) ns, where L is the distance in feet separating the driver and receiver. This delay includes one gate delay in both
the driver and receiver.
Data is impressed on the balanced-line system by unbalancing the line voltages with the driver output current. The driven line is selected by appropriate driver input logic levels.
The voltage difference is approximately:
j
V
DIFF
High series line resistance will cause degradation of the signal. The receivers, however, will detect signals as low as
(/2 I
O(on)
c
R
T
(1)
25 mV (or less). For normal line resistances, data may be
recovered from lines of several thousand feet in length.
Line termination resistors (R
treme ends of the line. For short lines, termination resistors
) are required only at the ex-
T
at the receiver only may prove adequate. The signal amplitude will then be approximately:
j
I
O(on)
c
R
T
V
DIFF
The strobe feature of the receivers and the inhibit feature of
the drivers allow the DS55107, DS75107 dual line circuits to
be used in data-bus or party-line systems. In these applications, several drivers and receivers may share a common
transmission line. An enabled driver transmits data to all
enabled receivers on the line while other drivers and receivers are disabled. Data is thus time multiplexed on the transmission line. The DS55107, DS75107 device specifications
allow widely varying thermal and electrical environments at
the various driver and receiver locations. The data-bus sys-
a
tem offers maximum performance at minimum cost.
The DS55107, DS75107 dual line circuits may also be used
in unbalanced or single line systems. Although these systems do not offer the same performance as balanced systems for long lines, they are adequate for very short lines
where environment noise is not severe.
The receiver threshold level is established by applying a DC
reference voltage to one receiver input terminal. The signal
from the transmission line is applied to the remaining input.
The reference voltage should be optimized so that signal
TL/F/9446– 3
(2)
http://www.national.com5
Typical Applications (Continued)
swing is symmetrical about it for maximum noise margin.
The reference voltage should be in the range of
a
3.0V. It can be provided by a voltage supply or by a volt-
age divider from an available supply voltage.
Unbalanced or Single-Line Systems
b
3.0V to
DS75108 Wired-OR Output Connections
TL/F/9446– 4
Precautions in the Use of DS1603, DS3603, DS55107,
DS75107, DS75108 and DS75208 Dual Line Receivers
The following precaution should be observed when using or
testing DS55107, DS75107 line circuits.
When only one receiver in a package is being used, at least
one of the differential inputs of the unused receiver should
be terminated at some voltage between
b
3.0V anda3.0V,
preferably at ground. Failure to do so will cause improper
operation of the unit being used because of common bias
circuitry for the current sources of the two receivers.
The DS55107, DS75107 and DS75108 line receivers feature a common mode input voltage range of
g
3.0V. This
satisfies the requirements for all but the noisiest system applications. For these severe noise environments, the common mode range can be extended by the use of external
input attenuators. Common mode input voltages can in this
way be reduced to
g
3.0V at the receiver input terminals.
Differential data signals will be reduced proportionately. Input sensitivity, input impedance and delay times will be adversely affected.
The DS75108 line receivers feature an open-collector-output circuit that can be connected in the DOT-OR logic configuration with other DS75108 outputs. This allows a level of
logic to be implemented without addtional logic delay.
Increasing Common Mode Input
Voltage Range of Receiver
TL/F/9446– 6
Circuit Differences Between ‘‘A’’ and Standard Devices
The difference between the ‘‘A’’ and standard devices is
shown in the following schematics of the input stage.
‘‘A’’ Devices
TL/F/9446– 7
Standard Devices
TL/F/9446– 5
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TL/F/9446– 8
Typical Applications (Continued)
The input protection diodes are useful in certain party-line
systems which may have multiple V
in which case, may be operated with some of the V
plies turned off. In such a system, if a supply is turned off
and allowed to go to ground, the equivalent input circuit
connected to that supply would be as follows:
‘‘A’’ Devices
Standard Devices
a
power supplies and,
TL/F/9446– 9
TL/F/9446– 10
a
sup-
Schematic Diagrams
DS55107/DS75107, DS75108, DS75208
This would be a problem in specific systems which might
possibly have the transmission lines biased to some potential greater than 1.4V. Since this is not a widespread application problem, both the ‘‘A’’ and standard devices will be
available. The ratings and characteristic specifications of
the ‘‘A’’ devices are the same as those of the standard
devices.
The DS55107A feature the ‘‘A’’ device input stage.
Note 1: (/2 of the dual circuit is shown.
Note 2: *Indicates connections common to second half of dual circuit.
Note 3: Components shown with dash lines are applicable to the DS55107, DS75207 and DS75107 only.
TL/F/9446– 11
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Physical Dimensions inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DS55107J, DS75107J or DS75208J
NS Package Number J14A
Order Number DS75107M, DS75107AM or DS75108M
Molded Dual-In-Line Package (M)
NS Package Number M14A
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Physical Dimensions inches (millimeters) (Continued)
Order Number DS75107N, DS75107AN, DS75108N or DS75208N
Molded Dual-In-Line Package (N)
NS Package Number N14A
DS55107/DS75107/DS75108/DS75208 Dual Line Receivers
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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:
1. Life support devices or systems are devices or 2. A critical component is any component of a life
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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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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