Datasheet SN75LBC179 Specification

SN75LBC179, SN65LBC179, SN65LBC179Q

LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

D

Designed for High-Speed Multipoint Data
Transmission Over Long Cables

D

Operate With Pulse Widths as Low
as 30 ns

D

Low Supply Current ...5 mA Max

D

Meets or Exceeds the Standard
Requirements of ANSI RS-485 and
ISO 8482:1987(E)

D

Common-Mode Voltage Range of –7 V
to 12 V

D

Positive- and Negative-Output Current
Limiting

D

Driver Thermal Shutdown Protection

D

Pin Compatible With the SN75179B

description

The SN65LBC179, SN65LBC179Q, and
SN75LBC179 differential driver and receiver pairs
are monolithic integrated circuits designed for
bidirectional data communication over long
cables that take on the characteristics of
transmission lines. They are balanced, or
differential, voltage mode devices that meet or
exceed the requirements of industry standards
ANSI RS-485 and ISO 8482:1987(E). Both
devices are designed using TI’s proprietary
LinBiCMOS with the low power consumption of
CMOS and the precision and robustness of
bipolar transistors in the same circuit.

The SN65LBC179, SN65LBC179Q, and
SN75LBC179 combine a differential line driver
and differential line receiver and operate from a
single 5-V supply. The driver differential outputs
and the receiver differential inputs are connected
to separate terminals for full-duplex operation and
are designed to present minimum loading to the
bus when powered off (V
feature a wide common-mode voltage range
making them suitable for point-to-point or
multipoint data bus applications. The devices also
provide positive- and negative-current limiting
and thermal shutdown for protection from line fault
conditions. The line driver shuts down at a junction
temperature of approximately 172°C.

= 0). These parts

CC

D OR P PACKAGE

(TOP VIEW)

V

CC

GND

1

R

2

D

3
4

A

8

B

7

Z

6

Y

5

Function Tables

DRIVER

INPUT

D

H

L

DIFFERENTIAL INPUTS

A–B

VID ≥ 0.2 V

–0.2 V < VID < 0.2 V

VID ≤ – 0.2 V

Open circuit

H = high level, L = low level,
? = indeterminate

logic symbol

R

D

†

This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.

†

2

3

OUTPUTS

Y Z

HLL

H

RECEIVER

OUTPUT

R

H

?
L

H

8
7

6
5

logic diagram (positive logic)

8

2

R

3

D

A

7

B

5

Y

6

Z

A
B

Z
Y

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

LinBiCMOS is a trademark of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  2000, Texas Instruments Incorporated

1

SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

description (continued)

The SN65LBC179, SN65LBC179Q, and SN75LBC179 are available in the 8-pin dual-in-line and small-outline
packages. The SN75LBC179 is characterized for operation over the commercial temperature range of 0°C to
70°C. The SN65LBC179 is characterized over the industrial temperature range of –40°C to 85°C. The
SN65LBC179Q is characterized over the extended industrial or automotive temperature range of – 40°C to
125°C.

schematics of inputs and outputs

RECEIVER A INPUTEQUIVALENT OF DRIVER INPUT RECEIVER B INPUT

V

Input

22 kΩ

CC

V

CC

Input

100 kΩ
NOM

18 kΩ

NOM

3 kΩ
NOM

18 kΩ

NOM

Input

V

CC

3 kΩ
NOM

12 kΩ

1.1 kΩ
NOM

DRIVER OUTPUT TYPICAL OF RECEIVER OUTPUT

V

CC

Output

100 kΩ

NOM

12 kΩ

R Output

1.1 kΩ
NOM

V

CC

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN75LBC179, SN65LBC179, SN65LBC179Q

High-level output current, I

mA

Low-level output current, I

mA

LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage range, VCC –0.3 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range at A, B, Y, or Z (see Note 1) –10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range at D or R (see Note 1) –0.3 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation (see Note 2) Internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values are with respect to GND.

2. The maximum operating junction temperature is internally limited. Uses the dissipation rating table to operate below this
temperature.

PACKAGE

D 725 mW 5.8 mW/°C 464 mW 377 mW
P 1100 mW 8.8 mW/°C 704 mW 572 mW

TA ≤ 25°C

POWER RATING

: SN65LBC179 –40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A

SN65LBC179Q –40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN75LBC179 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISSIPATION RATING TABLE

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

†

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V
High-level input voltage, V
Low-level input voltage, V
Differential input voltage, V
Voltage at any bus terminal (separately or common-mode), VO, VI, or V

Operating free-air temperature, T

‡

The algebraic convention, in which the least positive (most negative) limit is designated as minimum, is used in this data sheet for differential
input voltage, voltage at any bus terminal (separately or common mode), operating temperature, input threshold voltage, and common-mode
output voltage.

CC

IH

IL

ID

IC

p

p

OH

OL

A

D 2 V
D 0.8 V

A, B, Y, or Z –7 12 V
Y or Z –60
R –8
Y or Z 60
R 8
SN65LBC179 –40 85
SN65LBC179Q –40 125
SN75LBC179 0 70

4.75 5 5.25 V

‡

–6

6 V

°C

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

SN75LBC179, SN65LBC179, SN65LBC179Q

See Figure 1

|VOD|

Differential output voltage (see Note 3)

V

See Figure 2

CC

y

R

See Figure 3

LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

DRIVER SECTION

electrical characteristics over recommended operating conditions (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

V

IK

∆|VOD|
V

OC

∆|VOC|
I

O

I

IH

I

IL

I

OS

I

CC

†

All typical values are at VCC = 5 V and TA = 25°C.

NOTES: 3. The minimum VOD specification of the SN65179 may not fully comply with ANSI RS-485 at operating temperatures below 0°C.

Input clamp voltage II = –18 mA –1.5 V

RL = 54 Ω,

p

RL = 60 Ω,

Change in magnitude of differential
output voltage (see Note 4)

Common-mode output voltage 1 2.5 3 V
Change in magnitude of common-mode output

voltage (see Note 4)
Output current with power off VCC = 0, VO = –7 V to 12 V ±100 µA
High-level input current VI = 2.4 V –100 µA
Low-level input current VI = 0.4 V –100 µA
Short-circuit output current –7 V ≤ VO ≤ 12 V ±250 mA

Supply current No load

System designers should take the possibly lower output signal into account in determining the maximum signal transmission
distance.

4. ∆|VOD| and ∆|VOC| are the changes in the steady-state magnitude of VOD and VOC, respectively, that occur when the input is
changed from a high level to a low level.

See Figures 1 and 2 ±0.2 V

RL = 54 Ω, See Figure 1

SN65LBC179,
SN65LBC179Q

SN75LBC179 1.5 2.2 5
SN65LBC179,

SN65LBC179Q
SN75LBC179 1.5 2.2 5

SN65LBC179,
SN75LBC179

SN65LBC179Q 4.2 7 mA

1.1 2.2 5

1.1 2.2 5

±0.2 V

4.2 5 mA

switching characteristics, VCC = 5 V, TA = 25°C

PARAMETER TEST CONDITIONS MIN MAX UNIT

t

d(OD)

t

t(OD)

Differential-output delay time
Differential transition time

= 54 Ω,

L

7 18 ns
5 20 ns

4

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SN75LBC179, SN65LBC179, SN65LBC179Q

IIBus input current
V

See Figure 4

See Figure 4

LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

RECEIVER SECTION

electrical characteristics over recommended operating conditions (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

Positive-going input threshold voltage IO = –8 mA 0.2 V

IT+

V

Negative-going input threshold voltage IO = 8 mA –0.2 V

IT–

V

Hysteresis voltage (V

hys

V

High-level output voltage VID = 200 mV, IOH = –8 mA 3.5 4.5 V

OH

V

Low-level output voltage VID = –200 mV, IOL = 16 mA 0.3 0.5 V

OL

p

IT+

– V

) 45 mV

IT–

VI = 12 V,
Other inputs at 0 V,
VCC = 5 V

VI = 12 V,
Other inputs at 0 V,
VCC = 0 V

VI = –7 V,
Other inputs at 0 V,
VCC = 5 V

VI = –7 V,
Other inputs at 0 V,
VCC = 0 V

SN65LBC179,
SN75LBC179

SN65LBC179Q 0.7 1.2 mA
SN65LBC179,

SN75LBC179
SN65LBC179Q 0.8 1.2 mA
SN65LBC179,

SN75LBC179
SN65LBC179Q –0.5 –1.0 mA
SN65LBC179,

SN75LBC179
SN65LBC179Q –0.5 –1.0 mA

0.7 1 mA

0.8 1 mA

–0.5 –0.8 mA

–0.5 –0.8 mA

switching characteristics, VCC = 5 V, TA = 25°C

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

t

Propagation delay time, high- to low-level output

PHL

t

Propagation delay time, low- to high-level output

PLH

t

sk(p)

t

t

Pulse skew ( t
Transition time

PHL

– t

PLH

)

ID

PARAMETER MEASUREMENT INFORMATION

Y

0 V or 3 V

Figure 1. Differential and Common-Mode Output Voltage Test Circuit

D

= –1.5 V to 1.5 V,

V

OD

Z

15 30 ns
15 30 ns

3 6 ns
3 5 ns

R

L

2

R

L

2

V

OC

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5

SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

PARAMETER MEASUREMENT INFORMATION

V

test

R1
375 Ω

Y

0 V or 3 V

–7 V < V

test

D

< 12 V

V

test

R2
375 Ω

RL = 60 Ω

V

OD

Z

Figure 2. Differential Output Voltage Test Circuit

Generator

(see Note A)

50 Ω

Input

t

CL = 50 pF

RL = 54 Ω

TEST CIRCUIT VOLTAGE WAVEFORMS

(see Note B)

Output

d(ODH)

Output

t

t(OD)

50%

1.5 V

1.5 V

1.5 V

t

d(ODL)

50%

t

t(OD)

Figure 3. Driver Test Circuits and Differential Output Delay and Transition Time Voltage Waveforms

3 V

3 V

0 V

≈ 2.5 V
≈ – 2.5 V

Generator

(see Note A)

A

50 Ω

1.5 V

TEST CIRCUIT VOLTAGE WAVEFORMS

B

CL = 15 pF

(see Note B)

Output

Input

Output

t

PLH

t

t

90%

1.3 V

1.5 V

90%

1.5 V

t

1.3 V
10%10%

0 V

PHL

t

t

V

OH

V

OL

Figure 4. Receiver Test Circuit and Propagation Delay and Transition Time Voltage Waveforms

NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,

ZO=50Ω.

B. CL includes probe and jig capacitance.

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN75LBC179, SN65LBC179, SN65LBC179Q

LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

TYPICAL CHARACTERISTICS

5

4.5

4

3.5

3

2.5

2

1.5

– High-Level Output Voltage – V

1

OH

V

0.5
0

0102030

DRIVER

HIGH-LEVEL OUTPUT VOLTAGE

vs

HIGH-LEVEL OUTPUT CURRENT

VCC = 5 V
TA = 25°C

40 50 60

IOH – High-Level Output Current – mA

70 80 90 100

Figure 5 Figure 6

LOW-LEVEL OUTPUT VOLTAGE

LOW-LEVEL OUTPUT CURRENT

5

VCC = 5 V

4.5

TA = 25°C

4

3.5

3

2.5

2

1.5

– Low-Level Output Voltage – V

1

OL

V

0.5
0

0204060

IOL – Low-Level Output Current – mA

DRIVER

vs

80 100 120

DIFFERENTIAL OUTPUT VOLTAGE

OUTPUT CURRENT

4

VCC = 5 V
TA = 25°C

3.5

3

2.5

2

1.5

1

– Differential Output Voltage – V

OD

V

0.5

0

0102030405060

IO – Output Current – mA

Figure 7 Figure 8

DRIVER

vs

70 80 90 100

DIFFERENTIAL OUTPUT VOLTAGE

3

VCC = 5 V
Load = 54 Ω
VIH = 2 V

2.5

2

1.5

1

– Differential Output Voltage – V

0.5

OD

V

0
– 50 – 25 0 25

TA – Free-Air Temperature – °C

DRIVER

vs

FREE-AIR TEMPERATURE

50 75

100 125

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7

SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

TYPICAL CHARACTERISTICS

20

VCC = 5 V
Load = 54 Ω

15

10

5

– Differential Delay Times – ns

d(OD)

t

0
– 50 – 25 0 25

DRIVER

DIFFERENTIAL DELAY TIME

HIGH-LEVEL OUTPUT VOLTAGE

vs

FREE-AIR TEMPERATURE

t

d(ODL)

t

d(ODH)

50 75

TA – Free-Air Temperature – °C

100 125

6

5

4

3

2

– High-Level Output Voltage – V

1

OH

V

0

HIGH-LEVEL OUTPUT CURRENT

0 –10 – 20 – 30

IOH – High-Level Output Current – mA

Figure 9 Figure 10

RECEIVER

vs

VID = 200 mV

– 40 – 50

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

– Low-Level Output Voltage – V

0.2

OL

V

0.1
0

0510

RECEIVER

LOW-LEVEL OUTPUT VOLTAGE

vs

LOW-LEVEL OUTPUT CURRENT

VCC = 5 V
TA = 25°C
VID = – 200 mV

15 20 25

IOL – Low-Level Output Current – mA

Figure 11 Figure 12

30

35 40

RECEIVER

OUTPUT VOLTAGE

vs

6

5

4

3

2

– Output Voltage – V

O

1

V

0
– 80 – 60 – 40 – 20 0 20 40 60 80

DIFFERENTIAL INPUT VOLTAGE

VIC = 12 V

VIC = 0 V

VIC = –7 V

VID – Differential Input Voltage – mV

8

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LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

TYPICAL CHARACTERISTICS

AVERAGE SUPPLY CURRENT

vs

FREQUENCY

60

Receiver Load = 50 pF

55

Driver Load = Receiver Inputs

50
45
40
35
30
25
20
15

– Average Supply Current – mAI

10

CC

5
0

10 K 100 K 1 M 10 M 100 M

f – Frequency – Hz

SN75LBC179, SN65LBC179, SN65LBC179Q

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

RECEIVER

INPUT CURRENT

vs

INPUT VOLTAGE

(COMPLEMENTARY INPUT AT 0 V)

1

TA = 25°C

0.8

0.6

0.4

0.2

– 0.2

– 0.4

– Input Current – mA

– 0.6

I

I

– 0.8

– 1

VCC = 5 V

0

The shaded region of this graph represents
more than 1 unit load per RS-485.

– 8 – 6 – 4 – 2 0 2

VI – Input Voltage – V

468

10 12

Figure 13 Figure 14

RECEIVER

PROPAGATION DELAY TIME

vs

24.5

24

23.5

23

– Propagation Delay Time – ns

22.5

pd

t

22

– 40 – 20 0 20 40 60

FREE-AIR TEMPERATURE

VCC = 5 V
CL = 15 pF
VIO = ±1.5 V

t

TA – Free-Air Temperature – °C

t

PHL

PLH

80 100

Figure 15

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9

SN75LBC179, SN65LBC179, SN65LBC179Q
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

MECHANICAL INFORMATION

D (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE

14 PIN SHOWN

14

1

0.069 (1,75) MAX

0.050 (1,27)

A

0.020 (0,51)

0.014 (0,35)

0.010 (0,25)

0.004 (0,10)

8

7

0.010 (0,25)

0.157 (4,00)

0.150 (3,81)

M

0.244 (6,20)

0.228 (5,80)

Seating Plane

0.004 (0,10)

PINS **

DIM

A MAX

A MIN

0.008 (0,20) NOM

Gage Plane

0°–8°

8

0.197

(5,00)

0.189

(4,80)

14

0.344

(8,75)

0.337

(8,55)

0.010 (0,25)

0.044 (1,12)

0.016 (0,40)

4040047/D 10/96

16

0.394

(10,00)

0.386

(9,80)

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-012

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN75LBC179, SN65LBC179, SN65LBC179Q

LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS

SLLS173C – JANUARY 1994 – REVISED JANUARY 2000

MECHANICAL INFORMATION

P (R-PDIP-T8) PLASTIC DUAL-IN-LINE

0.400 (10,60)

0.355 (9,02)

8

5

0.260 (6,60)

0.240 (6,10)

1

0.021 (0,53)

0.015 (0,38)

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.

C. Falls within JEDEC MS-001

4

0.070 (1,78) MAX

0.020 (0,51) MIN

0.200 (5,08) MAX

0.125 (3,18) MIN

0.100 (2,54)

0.010 (0,25)

Seating Plane

M

0.325 (8,26)

0.300 (7,62)

0.015 (0,38)
Gage Plane

0.010 (0,25) NOM

0.430 (10,92)
MAX

4040082/D 05/98

For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm

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11

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Copyright  2000, Texas Instruments Incorporated