NSC DS96174CN, DS96172CN Datasheet

DS96172/DS96174
RS-485/RS-422 Quad Differential Line Drivers

DS96172/DS96174 RS-485/RS-422 Quad Differential Line Drivers

June 1998

General Description

The DS96172 and DS96174 are high speed quad differential
line drivers designed to meet EIA Standard RS-485. The de­vices have TRI-STATE
anced multipoint data bus transmission at rates up to
10 Mbps. The drivers have wide positive and negative com­mon mode range for multipoint applications in noisy environ­ments. Positive and negative current-limiting is provided
which protects the drivers from line fault conditions over a
+12V to −7.0V common mode range. A thermal shutdown
feature is also provided and occurs at junction temperature
of approximately 160˚C. The DS96172 features an active
high and active low Enable, common to all four drivers. The
DS96174 features separate active high Enables for each
driver pair. Compatible RS-485 receivers, transceivers, and
repeaters are also offered to provide optimum bus perfor­mance. The respective device types are DS96173,
DS96175, DS96176 AND DS96177.

®

outputs and are optimized for bal-

Connection Diagrams

16-Lead DIP

DS96172

Features

n Meets EIA Standard RS-485 and RS-422A
n Monotonic differential output switching
n Transmission rate to 10 Mbs
n TRI-STATE outputs
n Designed for multipoint bus transmission
n Common mode output voltage range: −7V to +12V
n Operates from single +5V supply
n Thermal shutdown protection
n DS96172/DS96174 are lead and function compatible

with the SN75172/75174 or the AM26LS31/MC3487
respectively

16-Lead DIP

DS96174

DS009626-1

Top View

Order Number DS96172CN or DS96174CN

See NS Package Number N16E

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

© 1998 National Semiconductor Corporation DS009626 www.national.com

Top View

DS009626-2

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
Operating Temperature Range 0˚C to +70˚C
Lead Temperature

Molded DIP (soldering, 10
sec.) 265˚C

Supply Voltage 7V
Enable Input Voltage 5.5V
Maximum Power Dissipation

(Note 1) 25˚C

N-Molded Package 1.98W

Recommended Operating
Conditions

Supply Voltage (V

) 4.75 5 5.25 V

CC

Common Mode Output

Voltage (V
Output Current HIGH (I
Output Current LOW (I

) −7 +12 V

OC

OH

OL

Operating Temperature (T

Note 1: Derate molded DIP package 16mW/˚C above 25˚C.

Min Typ Max Units

) −60 mA

)60mA

) 0 25 70 ˚C

A

Electrical Characteristics (Notes 3, 4)

over recommended temperature and supply voltage ranges, unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V
V
V
V
V
|V
|V

∆|V

V
∆|V

I

O

I

OZ

I

IH

I

IL

I

OS

I

CC

IH
IL
OH
OL
IC

OD1
OD2

OC

Input Voltage HIGH 2 V
Input Voltage LOW 0.8 V
Output Voltage HIGH IOH= −20 mA 3.1 V
Output Voltage LOW IOL=20mA 0.8 V

Input Clamp Voltage II= −18 mA −1.5 V
| Differential Output Voltage IO=0mA 6 V
| Differential Output Voltage RL=54Ω,

R

| Change in Magnitude of Differential RL=54Ωor 100Ω,

OD

= 100Ω,

L

Figure 1

Figure 1

Figure 1

1.5 2 V
2 2.3 V

±

0.2 V
Output Voltage (Note 5)
Common Mode Output Voltage (Note 6) RL=54Ω,

| Change in Magnitude of Common Mode

OC

Figure 1

3V

±

0.2 V
Output Voltage (Note 5)
Output Current with Power Off VCC= 0V, VO= −7.0V to 12V
High Impedance State Output Current VO= −7.0V to 12V

±

100 µA

±

50±200 µA
Input Current HIGH VI= 2.7V 20 µA
Input Current LOW VI= 0.5V −100 µA
Short Circuit Output Current VO= −7.0V −250
(Note 7) V

= 0V −150 mA

O

V

O=VCC

V

= 12V 250

O

150

Supply Current (All Drivers) No Load Outputs Enabled 50 70 mA

Output Disabled 50 60

Switching Characteristics

VCC= 5V, TA= 25˚C

Symbol Parameter Conditions Min Typ Max Units

t

DD

t

TD

t

PLH

Differential Output Delay Time RL=60Ω,
Differential Output Transition Time 15 25 ns
Propagation Delay Time, RL=27Ω,
Low-to-High Level Output

t

PHL

Propagation Delay Time, 12 20 ns
High-to-Low Level Output

t

PZH

t

PZL

www.national.com 2

Output Enable Time to High Level RL= 110Ω,
Output Enable Time to Low Level RL= 110Ω,

Figure 2

Figure 3

Figure 4
Figure 5

15 25 ns

12 20 ns

30 45 ns
30 45 ns