Datasheet DS96177CN Datasheet (NSC)

DS96177
RS-485/RS-422 Differential Bus Repeater

General Description

The DS96177 Differential Bus Repeater is a monolithic inte­grated device designed for one-way data communication on
multipoint bus transmissionlines. This device is designed for
balanced transmission bus line applications and meets EIA
Standard RS-485 and RS-422A. The device is designed to
improve the performance of the data communication over
long bus lines. The DS96177 has an active high Enable.

The DS96177 features positive and negative current limiting
and TRI-STATE
ceiver features high input impedance, input hysteresis for in­creased noise immunity, and input sensitivity of 200 mV over
a common mode input voltage range of −12V to +12V. The
driver features thermal shutdown for protection from line
fault conditions. Thermal shutdown is designed to occur at a
junction temperature of approximately 160˚C. The driver is
designed to drive current loads up to 60 mA maximum.

The DS96177 is designed for optimum performance when
used on transmission buses employing the DS96172 and

®

outputs for the receiver and driver.The re-

Connection Diagram Function Table

8-Lead Dual-In-Line Package

DS009644-1

Top View

Order Number DS96177CN

See NS Package Number N08E

DS96174 differential line drivers, DS96173 and DS96175
differential line receivers, or DS96176 differential bus trans­ceivers.

Features

n Meets EIA Standard RS-422A and RS-485
n Designed for multipoint transmission on long bus lines in

noisy environments

n TRI-STATE outputs
n Bus voltage range −7.0V to +12V
n Positive and negative current limiting
n Driver output capability
n Driver thermal shutdown protection
n Receiver input high impedance
n Receiver input sensitivity of
n Receiver input hysteresis of 50 mV typical
n Operates from single 5.0V supply
n Low power requirements

Differential Inputs Enable Outputs

A–B E TYZ

V

≥ 0.2V H H H L

ID

V

≤ −0.2V H L L H

ID

X L ZZZ

Note: T is an output pin only, monitoring the BUS (RO).
H=High Level
L=Low Level
X=Immaterial

Z=High Impedance (off)

±

60 mA max

±

200 mV

DS96177 RS-485/RS-422 Differential Bus Repeater

October 1993

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

© 1999 National Semiconductor Corporation DS009644 www.national.com

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

Ceramic DIP −65˚C to +175˚C
Molded DIP −65˚C to +150˚C

Lead Temperature

Ceramic DIP (Soldering, 60 sec.) 300˚C
Molded DIP (Soldering, 10 sec.) 265˚C

Maximum Power Dissipation (Note 1) at 25˚C

Molded Package 930 mW
Supply Voltage 7.0V
Input Voltage 5.5V

Recommended Operating
Conditions

Min Typ Max Units

Supply Voltage (V
Voltage at any Bus Terminal

(Separately or Common −7.0 12 V
Mode) (V

Differential Input Voltage

(V

)

ID

Output Current HIGH (I

Driver −60 mA
Receiver −400 µA

Output Current LOW (I

) 4.75 5.0 5.25 V

CC

or VCM)

I

)

OH

)

OL

±

12 V

Driver 60 mA
Receiver 16

Operating Temperature (T

Note 1: Derate molded DIP package 7.5 mW/˚C above 25˚C.

) 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

DRIVER SECTION

V

IH

V

IL

V

IC

|V

OD1

|V

OD2

∆|V

OD2

V

OC

∆|V

OC

I

O

I

OZ

I

IH

I

IL

I

OS

I

CC

RECEIVER SECTION

V

TH

V

TL

V

T+−VT−

V

IH

V

IL

Input Voltage HIGH 2.0 V
Input Voltage LOW 0.8 V

Input Clamp Voltage I
| Differential Output Voltage I
| Differential Output Voltage R

| Change in Magnitude of Differential R

Output Voltage (Note 5)

Common Mode Output Voltage (Note 6) R

| Change in Magnitude of Common Mode

=

−18 mA −1.5 V

I

=

0 mA 6.0 V

O

=

Figure 1

100Ω,

L

=

R

R
and

Figure 1

and

54Ω,

L

=

Figure 1

100Ω,

L

=

Figure 1

54Ω

L

Figure 2

=

54Ω or 100Ω 3.0 V

L

Figure 2

V

CM

=

0V

2.0 2.25 V

1.5 2.0

Figure 1

Output Voltage (Note 5)

Output Current with Power Off V

High Impedance State Output Current V

Input Current HIGH V

Input Current LOW V

Short Circuit Output Current V

(Note 10) V

=

CC

=

O

=

2.7V 20 µA

I

=

0.5V −100 µA

I

=

O

=

O

=

V

O

=

V

O

=

0V, V

−7.0V to +12V

−7.0V to +12V

O

±50±

−7.0V −250
0V −150 mA
V

CC

12V 250

Supply Current No Load Outputs Enabled 35 mA

Outputs Disabled 40

Differential Input V

=

O

2.7V, I

=

−0.4 mA 0.2 V

O

High Threshold Voltage

Differential Input Low V

=

O

0.5V, I

=

8.0 mA −0.2 V

O

Threshold Voltage (Note 7)

Hysteresis (Note 8) V

=

0V 50 mV

CM

Enable Input Voltage HIGH 2.0 V

Enable Input Voltage LOW 0.8 V

±

0.2 V

±

0.2 V

±

100 µA
200 µA

150

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Electrical Characteristics (Notes 3, 4) (Continued)

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

Symbol Parameter Conditions Min Typ Max Units

RECEIVER SECTION

V

IC

V

OH

V

OL

I

OZ

I

I

I

IH

I

IL

R

I

I

OS

I

CC

Enable Input Clamp Voltage I
High Level Output Voltage V
Low Level Output Voltage V

High-Impedance State Output V

Line Input Current (Note 9) Other Input=0V V

Enable Input Current HIGH V
Enable Input Current LOW V
Input Resistance 12 kΩ
Short Circuit Output Current (Note 10) −15 −85 mA
Supply Current (Total Package) No Load Outputs Enabled 35 mA

=

−18 mA −1.5 V

I

=

200 mV, I

ID

=

−200 mV, I

ID

Figure 3

=

0.4V −360 µA

O

=

V

2.4V 20

O

=

2.7V 20 µA

IH

=

0.4V −100 µA

IL

OH

=

−400 µA,

Figure 3

=

8.0 mA 0.45 V

OL

=

I

16 mA 0.50

OL

=

12V 1.0 mA

I

=

V

−7.0V −0.8

I

2.7 V

Outputs Disabled 40

Drive Switching Characteristics

=

V

CC

Symbol Parameter Conditions Min Typ Max Units

t

DD

t

TD

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

=

5.0V, T

25˚C

A

Differential Output Delay Time R
Differential Output Transition Time R
Propagation Delay Time, R
Low-to-High Level Output
Propagation Delay Time, R
High-to-Low Level Output
Output Enable Time to High Level R
Output Enable Time to Low Level R
Output Disable Time from High Level R
Output Disable Time from Low Level R

=

Figure 4

60Ω,

L

=

Figure 4

60Ω,

L

=

Figure 5

27Ω,

L

=

Figure 5

27Ω,

L

=

Figure 6

110Ω,

L

=

Figure 7

110Ω,

L

=

Figure 6

110Ω,

L

=

Figure 7

110Ω,

L

15 25 ns
15 25 ns
12 20 ns

12 20 ns

25 45 ns
25 40 ns
20 25 ns
29 35 ns

Receiver Switching Characteristics

=

V

CC

Symbol Parameter Conditions Min Typ Max Units

t

PLH

t

PHL

t

PZH

t

PZL

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 DS96177. All typicals are given for V
Note 4: All currents intothe device pins are positive; all currents out of the device pins are negative.All voltages are referenced to ground unlessotherwise specified.
Note 5: ∆|V
Note 6: In EIA Standards RS-422A and RS-485, V
Note 7: 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.

=

5.0V, T

25˚C

A

Propagation Delay Time, V
Low-to-High Level Output C

=

0V to 3.0V, 16 25 ns

ID

=

Figure 8

15 pF,

L

Propagation Delay Time, 16 25 ns
High-to-Low Level Output
Output Enable Time to High Level C

=

Figure 9

15 pF,

L

15 22 ns
Output Enable Time to Low Level 15 22 ns
Output Disable Time from High Level C

L

=

5.0 pF,

Figure 9

14 30 ns
Output Disable Time from Low Level 24 40 ns

=

5V and T

CC

| and ∆|VOC| are the changes in magnitude of VOD,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

=

25˚C.

A

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Receiver Switching Characteristics (Continued)

Note 8: Hysteresis is the difference between the positive-going input threshold voltage, VT+, and the negative going input threshold voltage, VT−.
Note 9: Refer to EIA Standards RS-485 for exact conditions.
Note 10: Only one output at a time should be shorted.

Parameter Measurement Information

DS009644-2

FIGURE 1. Driver V

OD2

and V

OC

FIGURE 3. Receiver VOHand V

FIGURE 2. Driver V

Common Mode Voltage

DS009644-3

OL

with Varying

OD2

DS009644-4

DS009644-5

FIGURE 4. Driver Differential Output Delay and Transition Times

DS009644-7

FIGURE 5. Drive Propagation Times

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DS009644-6

DS009644-8

Parameter Measurement Information (Continued)

DS009644-9

FIGURE 6. Driver Enable and Disable Times (t

DS009644-11

FIGURE 7. Driver Enable and Disable Times (t

DS009644-13

FIGURE 8. Receiver Propagation Delay Times

PZH,tPHZ

PZL,tPLZ

DS009644-10

)

DS009644-12

)

DS009644-14

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Parameter Measurement Information (Continued)

DS009644-15

DS009644-16

DS009644-18

DS009644-17

DS009644-19

FIGURE 9. Receiver Enable and Disable Times

Note 11: The input pulse is supplied by a generator having the following characteristics: PRR=1.0 MHz, duty cycle ≈ 50%,tr≤6.0 ns, tf≤ 6.0 ns, Z
Note 12: C
Note 13: DS96177 Enable is active high.
Note 14: All diodes are 1N916 or equivalent.

includes probe and stray capacitance.

L

=

50Ω.

O

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Typical Application

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.
Repeater control logic not shown

FIGURE 10.

DS009644-20

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Physical Dimensions inches (millimeters) unless otherwise noted

Molded Dual-In-Line Package (N)

Order Number DS96177CN
NS Package Number N08E

DS96177 RS-485/RS-422 Differential Bus Repeater

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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.

with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.

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