Datasheet DS96174CN, DS96172CN Datasheet (NSC)

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

Switching Characteristics (Continued)

VCC= 5V, TA= 25˚C

Symbol Parameter Conditions Min Typ Max Units

t

PHZ

t

PLZ

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 DS96172/DS96174. 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 referenced to ground unless otherwise specified.
Note 5: ∆ |V
Note 6: In EIA Standards RS-422A and RS-485, V
Note 7: Only one output at a time should be shorted.

Output Disable Time from High Level RL= 110Ω,
Output Disable Time from Low Level RL= 110Ω,

| and ∆|VOC| are the changes in magnitude of VODand VOCrespectively, that occur when the input is changed from a high level to a low level.

OD

which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.

OC,

Figure 4
Figure 5

25 35 ns
30 45 ns

= 5V and TA= 25˚C.

CC

Parameter Measurement Information

DS009626-4

FIGURE 1. Differential and Common Mode Output Voltage

DS009626-5 DS009626-6

FIGURE 2. Differential Output Delay and Transition Times

DS009626-7

FIGURE 3. Propagation Delay Times

DS009626-8

www.national.com3

Parameter Measurement Information (Continued)

DS009626-10

DS009626-9

FIGURE 4. t

FIGURE 5. t

Note 8: The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, duty cycle = 50%,tr≤5.0 ns, tf≤ 5.0 ns, ZO=50Ω.
Note 9: C

includes probe and jig capacitance.

L

Note 10: DS96172 with active high and active low Enables is shown here. DS96174 has active high Enable only.
Note 11: To test the active low Enable E of DS96172, ground E and apply an inverted waveform to E . DS96174 has active high Enable only.

PZH

DS009626-11

PZL

and t

and t

PHZ

DS009626-12

PLZ

Function Tables

DS96172

Input Enables Outputs

AEE

HHXHL
LHXLH
H XLHL
LXLLH
XLHZZ

www.national.com 4

YZ

DS96174

Input Enable Outputs

YZ

HHHL
LHLH
XLZZ

H = High Level
X = Immaterial
L = Low Level
Z = High Impedance (off)

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 6.

DS009626-13

www.national.com5

Physical Dimensions inches (millimeters) unless otherwise noted

Molded Dual-In-Line Package (N)

Order Number DS96172CN or DS96174CN

NS Package Number N16E

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

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