NSC DS96175CN, DS96173CN Datasheet
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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