Datasheet DS96175CN, DS96173CN Datasheet (NSC)

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

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

June 1998

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
anced 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. TheDS96175featuresseparateactivehigh Enables
for each receiver pair.Compatible RS-485 drivers, transceiv­ers, and repeaters are also offered to provide optimum bus
performance. The respective device types are DS96172,
DS96174, DS96176 and DS96177.

®

outputs and are optimized for bal-

Connection Diagrams

16-Lead DIP

DS96173

Features

n Meets EIA Standard RS-485, RS-422A, RS-423A
n Designed for multipoint bus applications
n TRI-STATE Outputs
n Common mode input voltage range: −7V to +12V
n Operates from single +5V supply
n Input sensitivity of
n Input hysteresis of 50 mV typical
n High input impedance
n DS96173/DS96175 are lead and function compatible

with SN75173/75175 or the AM26LS32/MC3486
respectively

±

200 mV over common mode range

16-Lead DIP

DS96175

DS009628-1

Order Number DS96173CN or DS96175CN

See NS Package Number N16E

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

© 1998 National Semiconductor Corporation DS009628 www.national.com

DS009628-2

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
Differential Input Voltage
Enable Input Voltage 7V

±

25V

±

25V

Low Level Output Current 50 mA

Recommended Operating
Conditions

Supply Voltage (V

) 4.75 5 5.25 V

CC

Common Mode Input −7 +12 V

Voltage (V

)

CM

Differential Input −7 +12 V

Voltage (V
Output Current High (I
Output Current LOW (I

)

ID

OH

OL

Operating Temperature (T

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

Min Typ Max Units

) −400 µA
)16mA

) 0 25 70 ˚C

A

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

V

TH

V

TL

V

T+−VT−

V

IH

V

IL

V

IC

V

OH

V

OL

I

OZ

I

I

I

IH

I

IL

R

I

I

OS

I

CC

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 V
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, V
Note 7: Refer to EIA Standards RS-485 for exact conditions.
Note 8: Only one output at a time should be shorted.

Differential Input VO= 2.7V, IO= − 0.4 mA 0.2 V
High Threshold Voltage
Differential Input (Note 5) VO= 0.5V, IO= 16 mA −0.2 V
Low Threshold Voltage
Hysteresis (Note 6) VCM=0V 50 mV
Enable Input Voltage HIGH 2.0 V
Enable Input Voltage LOW 0.8 V
Enable Input Clamp Voltage II= −18 mA −1.5 V
Output Voltage HIGH VID= 200 mV, IOH= −400 µA 2.7 V
Output Voltage LOW VID= −200 mV IOL= 8 mA 0.45 V

I

= 16 mA 0.50

High Impedance State Output VO= 0.4V to 2.4V

OL

±

20 µA

Line Input Current (Note 7) Other Input = 0V VI= 12V 1.0 mA

V

= −7V −0.8

I

Enable Input Current HIGH VIH= 2.7V 20 µA
Enable Input Current LOW VIL= 0.4V −100 µA
Input Resistance 12 kΩ
Short Circuit Output Current (Note 8) −15 −85 mA
Supply Current Outputs Disabled 75 mA

= 5V and TA= 25˚C.

CC

, and the negative going input threshold voltage, VT−.

T+

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Switching Characteristics

VCC= 5V, TA= 25˚C

Symbol Parameter Conditions Min Typ Max Units

t

PLH

t

PHL

Propagation Delay Time, VID= −2.5V to 2.5V, 15 25 ns
Low to High Level Output C

=15pF,

L

Figure 1

Propagation Delay Time, 15 25 ns
High to Low Level Output

t

PZH

t

PZL

t

PHZ

t

PLZ

Output Enable Time to High Level CL=15pF,
Output Enable Time to Low Level CL=15pF,
Output Disable Time from High Level CL= 5 pF,
Output Disable Time from Low Level CL= 5 pF,

Figure 2

Figure 3
Figure 2
Figure 3

15 22 ns
15 22 ns
14 30 ns
24 40 ns

Function Tables

(Each Receiver) DS96173

Differential Inputs Enables Outputs

A–B E E

>

V

0.2V H X H

ID

XL H

<

V

−0.2V H X L

ID

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

V

ID

V

≤ −0.2V H L

ID

XLZ

V

Parameter Measurement Information

DS009628-3

FIGURE 1. t

PLH,tPHL

DS009628-4

(Note 11)

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Parameter Measurement Information (Continued)

DS009628-6

DS009628-5

FIGURE 2. t

FIGURE 3. t

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: C
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.

includes probe and stray capacitance.

L

PHZ,tPZH

PZL,tPLZ

(Note 11)

DS009628-8

DS009628-7

(Note 11)

Typical Application

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.

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DS009628-9

5

Physical Dimensions inches (millimeters) unless otherwise noted

Molded Dual-In-Line Package (N)

Order Number DS96173CN or DS96175CN

NS Package Number N16E

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

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