DS96175CN/NOPB - NATIONAL SEMICONDUCTOR

DS96173,DS96175

DS96173/DS96175 RS-485/RS-422 Quad Differential Line Receivers

Literature Number: SNLS391B

DS96173/DS96175

RS-485/RS-422 Quad Differential Line Receivers

General Description

The DS96173 and DS96175 are high speed quad differential

line receivers designed to meet EIA Standard RS-485. The

devices have TRI-STATE®outputs and are optimized for

balanced multipoint data bus transmission at rates up to 10

Mbps. The receivers feature high input impedance, input

hysteresis for increased noise immunity, and input sensitivity

of 200 mV over a common mode input voltage range of −7V

to +12V. The receivers are therefore suitable for multipoint

applications in noisy environments. The DS96173 features

an active high and active low Enable, common to all four

receivers. The DS96175 features separate active high En-

ables for each receiver pair. Compatible RS-485 drivers,

transceivers, and repeaters are also offered to provide opti-

mum bus performance. The respective device types are

DS96172, DS96174, DS96176 and DS96177.

Features

nMeets EIA Standard RS-485, RS-422A, RS-423A

nDesigned for multipoint bus applications

nTRI-STATE Outputs

nCommon mode input voltage range: −7V to +12V

nOperates from single +5V supply

nInput sensitivity of ±200 mV over common mode range

nInput hysteresis of 50 mV typical

nHigh input impedance

nDS96173/DS96175 are lead and function compatible

with SN75173/75175 or the AM26LS32/MC3486

respectively

Connection Diagrams

16-Lead DIP

DS96173

00962801

16-Lead DIP

DS96175

00962802

Order Number DS96173CN or DS96175CN

See NS Package Number N16E

TRI-STATE®is a registered trademark of National Semiconductor Corporation.

June 1998

DS96173/DS96175 RS-485/RS-422 Quad Differential Line Receivers

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Storage Temperature Range

Molded DIP −65˚C to

+150˚C

Lead Temperature

Molded DIP (soldering, 10

sec.) 265˚C

Maximum Power Dissipation (Note 1) at 25˚C

N-Molded Package 1.84W

Supply Voltage 7V

Input Voltage, A or B Inputs ±25V

Differential Input Voltage ±25V

Enable Input Voltage 7V

Low Level Output Current 50 mA

Recommended Operating

Conditions

Min Typ Max Units

Supply Voltage (V

) 4.75 5 5.25 V

Common Mode Input −7 +12 V

Voltage (V

)

Differential Input −7 +12 V

Voltage (V

)

Output Current High (I

) −400 µA

Output Current LOW (I

)16mA

Operating Temperature (T

) 0 25 70 ˚C

Note 1: Derate molded DIP package 15 mW/˚C above 25˚C.

Electrical Characteristics (Notes 3, 4)

over recommended temperature, common mode input voltage, and supply voltage ranges, unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

Differential Input V

= 2.7V, I

= − 0.4 mA 0.2 V

High Threshold Voltage

Differential Input (Note 5) V

= 0.5V, I

= 16 mA −0.2 V

Low Threshold Voltage

T+

−V

T−

Hysteresis (Note 6) V

=0V 50 mV

Enable Input Voltage HIGH 2.0 V

Enable Input Voltage LOW 0.8 V

Enable Input Clamp Voltage I

= −18 mA −1.5 V

Output Voltage HIGH V

= 200 mV, I

= −400 µA 2.7 V

Output Voltage LOW V

= −200 mV I

= 8 mA 0.45 V

= 16 mA 0.50

High Impedance State Output V

= 0.4V to 2.4V ±20 µA

Line Input Current (Note 7) Other Input = 0V V

= 12V 1.0 mA

= −7V −0.8

Enable Input Current HIGH V

= 2.7V 20 µA

Enable Input Current LOW V

= 0.4V −100 µA

Input Resistance 12 kΩ

Short Circuit Output Current (Note 8) −15 −85 mA

Supply Current Outputs Disabled 75 mA

Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices

should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.

Note 3: Unless otherwise specified Min/Max limits apply across the 0˚C to +70˚C range for the DS96173/DS96175. All typicals are given for VCC =5Vand

TA= 25˚C.

Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are reference to ground unless otherwise specified.

Note 5: The algebraic convention, when the less positive (more negative) limit is designated minimum, is used in this data sheet for common mode input voltage

and threshold voltage levels only.

Note 6: Hysteresis is the difference between the positive-going input threshold voltage, VT+, and the negative going input threshold voltage, VT−.

Note 7: Refer to EIA Standards RS-485 for exact conditions.

Note 8: Only one output at a time should be shorted.

DS96173/DS96175

www.national.com 2

Switching Characteristics

= 5V, T

= 25˚C

Symbol Parameter Conditions Min Typ Max Units

PLH

Propagation Delay Time, V

= −2.5V to 2.5V, 15 25 ns

Low to High Level Output C

=15pF,Figure 1

PHL

Propagation Delay Time, 15 25 ns

High to Low Level Output

PZH

Output Enable Time to High Level C

=15pF,Figure 2 15 22 ns

PZL

Output Enable Time to Low Level C

=15pF,Figure 3 15 22 ns

PHZ

Output Disable Time from High Level C

=5pF,Figure 2 14 30 ns

PLZ

Output Disable Time from Low Level C

=5pF,Figure 3 24 40 ns

Function Tables

(Each Receiver) DS96173

Differential Inputs Enables Outputs

A–B E E V

>0.2V H X H

XL H

<−0.2V H X L

XL L

XLXZ

XXHZ

H = High Level

L = Low Level

X = Immaterial

Z = High Impedance (off)

(Each Receiver) DS96175

Differential Inputs Enable Output

A–B Y

≥0.2V H H

≤−0.2V H L

XLZ

Parameter Measurement Information

00962803

00962804

FIGURE 1. t

PLH

PHL

(Note 11)

DS96173/DS96175

www.national.com3

Parameter Measurement Information (Continued)

Note 9: The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, 50% duty cycle, tr≤6.0 ns, tf≤6.0 ns, ZO=50Ω.

Note 10: CLincludes probe and stray capacitance.

Note 11: DS96173 with active high and active low Enables is shown here. DS96175 has active high Enable only.

Note 12: All diodes are 1N916 or equivalent.

Note 13: To test the active low Enable E of DS96173, ground E and apply an inverted input waveform to E . DS96175 has active high Enable only.

Typical Application

00962805

00962806

FIGURE 2. t

PHZ

PZH

(Note 11)

00962807

00962808

FIGURE 3. t

PZL

PLZ

(Note 11)

00962809

Note: The line length should be terminated at both ends in its

characteristic impedance. Stub lengths off the main line should be kept as

short as possible.

FIGURE 4.

DS96173/DS96175

www.national.com 4

Physical Dimensions inches (millimeters)

unless otherwise noted

Molded Dual-In-Line Package (N)

Order Number DS96173CN or DS96175CN

NS Package Number N16E

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.

For the most current product information visit us at www.national.com.

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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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant 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 safety or effectiveness.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship

Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned

Substances’’ as defined in CSP-9-111S2.

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www.national.com

DS96173/DS96175 RS-485/RS-422 Quad Differential Line Receivers

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