DS55107AJ/883 - National Semiconductor

DS75107

Dual Line Receiver

General Description

The product described herein is a TTL compatible dual high

speed circuit intended for sensing in a broad range of system

applications. While the primary usage will be for line receiv-

ers of MOS sensing, the product may effectively be used as

a voltage comparator, level translator, window detector,

transducer preamplifier, and in other sensing applications.

As a digital line receiver the product is applicable with the

SN55109/SN75109 and µA75110/DS75110 companion driv-

ers, or may be used in other balanced or unbalanced

party-line data transmission systems.

Input protection diodes are incorporated in series with the

collectors of the differential input stage. These diodes are

useful in certain applications that have multiple V

+ sup-

plies or V

+ supplies that are turned off.

Features

nDiode protected input stage for power “OFF” condition

n17 ns typ high speed

nTTL compatible

n±10 mV or ±25 mV input sensitivity

n±3V input common-mode range

nHigh input impedance with normal V

,orV

=0V

nStrobes for channel selection

nDual circuits

nSensitivity gntd. over full common-mode range

nLogic input clamp diodes—meets both “A” and “B”

version specifications

n±5V standard supply voltages

Connection Diagram

Selection Guide

Temperature→0˚C ≤T

≤+70˚C

Package→Cavity or Molded Dip

Input Sensitivity→±25 mV ±10 mV

Output Logic↓

TTL Active Pull-Up DS75107

TTL Open Collector

Dual-In-Line Package

DS009446-1

Top View

Order Number DS75107M, DS75107N

See NS Package Number M14A or N14A

For Complete Military 883 Specifications, see RETS Datasheet.

Order Number DS55107AJ/883

See NS Package Number J14A

May 1999

DS75107 Dual Line Receiver

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

+7V

Supply Voltage, V

− −7V

Differential Input Voltage ±6V

Common Mode Input Voltage ±5V

Strobe Input Voltage 5.5V

Storage Temperature Range −65˚C to +150˚C

Maximum Power Dissipation (Note 1) at 25˚C

Cavity Package 1308 mW

Molded Package 1207 mW

Lead Temperature (Soldering, 4 sec) 260˚C

Note: Derate cavity package 8.7 mW/˚C above 25˚C; derate molded package

9.7 mW/˚C above 25˚C.

Operating Conditions

DS75107

Min Nom Max

Supply Voltage V

+ 4.75V 5V 5.25V

Supply Voltage V

− −4.75V −5V −5.25V

Operating Temperature Range 0˚C to +70˚C

DS75107

Electrical Characteristics

MIN

≤T

MAX

(Notes 2, 3)

Symbol Parameter Conditions Min Typ Max Units

High Level Input Current V

CC+

=Max, V

CC−

=Max, 30 75 µA

into A1, B1, A2 or B2 V

=0.5V, V

=−3V to 3V

Low Level Input Current V

CC+

=Max, V

CC−

=Max, −10 µA

into A1, B1, A2 or B2 V

=−2V, V

=−3V to 3V

High Level Input Current V

CC+

=Max, V

IH(S)

=2.4V 40 µA

into G1 or G2 V

CC−

=Max V

IH(S)

Max V

CC+

1mA

Low Level Input Current V

CC+

=Max, V

CC−

=Max, −1.6 mA

into G1 or G2 V

IL(S)

=0.4V

High Level Input Current into S V

CC+

=Max, V

IH(S)

=2.4V 80 µA

CC−

=Max V

IH(S)

=Max V

CC+

2mA

Low Level Input Current into S V

CC+

=Max, V

CC−

=Max, −3.2 mA

IL(S)

=0.4V

High Level Output Voltage V

CC+

=Min, V

CC−

=Min,

LOAD

=−400 µA, V

=25 mV, 2.4 V

=−3V to 3V, (Note 3)

Low Level Output Voltage V

CC+

=Min, V

CC−

=Min,

SINK

=16 mA, V

=−25 mV, 0.4 V

=−3V to 3V

High Level Output Current V

CC+

=Min, V

CC−

=Min 250 µA

=Max V

CC+

Short Circuit Output Current V

CC+

=Max, V

CC−

=Max, −18 −70 mA

(Notes 3, 5)

CCH+

High Logic Level Supply V

CC+

=Max, V

CC−

=Max, 18 30 mA

Current from V

=25 mV, T

=25˚C

CCH−

High Logic Level Supply V

CC+

=Max, V

CC−

=Max, −8.4 −15 mA

Current from V

=25 mV, T

=25˚C

Input Clamp Voltage on G or S V

CC+

=Min, V

CC−

=Min, −1 −1.5 V

=−12 mA, T

=25˚C

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Switching Characteristics

CC+

=5V, V

CC−

=−5V, T

=25˚C

Symbol Parameter Conditions Min Typ Max Units

PLH(D)

Propagation Delay Time, Low to

High Level, from Differential Inputs

A and B to Output

=390Ω,C

=50 pF,

(Note 4) 17 25 ns

19 25 ns

PHL(D)

Propagation Delay Time, High to

Low Level, from Differential Inputs

A and B to Output

=390Ω,C

=50 pF,

(Note 4) 17 25 ns

19 25 ns

PLH(S)

Propagation Delay Time, Low to

High Level, from Strobe Input G or

S to Output

=390Ω,C

=50 pF 10 15 ns

13 20 ns

PHL(S)

Propagation Delay Time, High to

Low Level, from Strobe Input G or

S to Output

=390Ω,C

=50 pF 8 15 ns

13 20 ns

Switching Characteristics

CC+

=5V, V

CC−

=−5V, T

=25˚C

Symbol Parameter Conditions Min Typ Max Units

PLH(D)

Propagation Delay Time, Low-to- R

=470Ω,C

=15 pF, (Note 6)

High Level, from Differential 35 ns

Inputs A and B to Output

PHL(D)

Propagation Delay Time, High-to- R

=470Ω,C

=15 pF, (Note 6)

Low Level, from Differential 20 ns

Inputs A and B to Output

PLH(S)

Propagation Delay Time, Low-to- R

=470Ω,C

=15 pF

High Level, from Strobe Input G 17 ns

or S to Output

PHL(S)

Propagation Delay Time, High-to- R

=470Ω,C

=15 pF

Low Level, from Strobe Input G 17 ns

or S to Output

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 0˚C to +70˚C range for the DS75107. All typical values are for TA=25˚C and VCC =5V.

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.

Note 4: Differential input is +100 mV to −100 mV pulse. Delays read from 0 mV on input to 1.5V on output.

Note 5: Only one output at a time should be shorted.

Note 6: Differential input is +10 mV to −30 mV pulse. Delays read from 0 mV on input to 1.5V on output.

Voltage Waveforms

DS009446-12

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Typical Applications

APPLICATION

The DS75107 dual line circuit is designed specifically for use

in high speed data transmission systems that utilize bal-

anced, 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 sys-

tem performance is not affected by circulating ground cur-

rents.

The unique driver output circuit allows terminated transmis-

sion 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.

Cross-talk 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 unbalanc-

ing the line voltages with the driver output current. The

driven line is selected by appropriate driver input logic levels.

The voltage difference is approximately:

DIFF

≅

⁄

O(on)

: (1)

High series line resistance will cause degradation of the sig-

nal. The receivers, however, will detect signals as low as

25 mV(or less). For normal line resistances, data may be re-

covered from lines of several thousand feet in length.

Line termination resistors (R

) are required only at the ex-

treme ends of the line. For short lines, termination resistors

at the receiver only may prove adequate. The signal ampli-

tude will then be approximately:

DIFF

≅I

O(on)

: (2)

Data-Bus or Party-Line System

DS009446-2

Data-Bus or Party-Line System

DS009446-3

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Typical Applications (Continued)

The strobe feature of the receiver and the inhibit feature of

the driver allows the DS75107 dual line circuit 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 receiv-

ers on the line while other drivers and receivers are disabled.

Data is thus time multiplexed on the transmission line.

DS75107 device specifications allow widely varying thermal

and electrical environments at the various driver and re-

ceiver locations. The data-bus system offers maximum per-

formance at minimum cost.

The DS75107 dual line circuits may also be used in unbal-

anced 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 environ-

ment 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

swing is symmetrical about it for maximum noise margin.

The reference voltage should be in the range of −3.0V to

+3.0V. It can be provided by a voltage supply or by a voltage

divider from an available supply voltage.

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 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 −3.0V and +3.0V,

preferably at ground. Failure to do so will cause improper op-

eration of the unit being used because of common bias cir-

cuitry for the current sources of the two receivers.

The DS75107 line receiver features a common mode input

voltage range of ±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 ±3.0V at the receiver

input terminals. Differential data signals will be reduced pro-

portionately. Input sensitivity, input impedance and delay

times will be adversely affected.

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.

Unbalanced or Single-Line Systems

DS009446-4

Increasing Common Mode Input

Voltage Range of Receiver

DS009446-5

DS75108 Wired-OR Output Connections

DS009446-6

“A” Devices

DS009446-7

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Typical Applications (Continued)

The input protection diodes are useful in certain party-line

systems which may have multiple V+ power supplies and, in

which case, may be operated with some of the V+ supplies

turned off. In such a system, if a supply is turned off and al-

lowed to go to ground, the equivalent input circuit connected

to that supply would be as follows:

This would be a problem in specific systems which might

possibly have the transmission lines biased to some poten-

tial greater than 1.4V. Since this is not a widespread applica-

tion problem, both the “A” and standard devices will be avail-

able. The ratings and characteristic specifications of the “A”

devices are the same as those of the standard devices.

Standard Devices

DS009446-8

“A” Devices

DS009446-9

Standard Devices

DS009446-10

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Schematic Diagrams

DS55107/DS75107, DS75108, DS75208

DS009446-11

⁄

of the dual circuit is shown.

*Indicates connections common to second half of dual circuit.

Components shown with dash lines are applicable to the DS55107, DS75207 and DS75107 only.

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Physical Dimensions inches (millimeters) unless otherwise noted

Ceramic Dual-In-Line Package (J)

Order Number DS75107J

NS Package Number J14A

Molded Dual-In-Line Package (M)

Order Number DS75107M, DS75107AM

NS Package Number M14A

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

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into the body, or (b) support or sustain life, and

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

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

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www.national.com

Molded Dual-In-Line Package (N)

Order Number DS75107N, DS75107AN

NS Package Number N14A

DS75107 Dual Line Receiver

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.