1
2
3
4
8
7
6
5
VCC
R
D
GND
A
B
Z
Y
SN65LBC179AD (Marked as BL179A)
SN65LBC179AP (Marked as 65LBC179A)
SN75LBC179AD (Marked as LB179A)
SN75LBC179AP (Marked as 75LBC179A)
(TOP VIEW)
R
D
B
A
Z
Y
7
8
6
5
2
3
SN65LBC179A
SN75LBC179A
www.ti.com
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
Check for Samples: SN65LBC179A,SN75LBC179A
1FEATURES
2•High-Speed Low-Power LinBiCMOS™Circuitry
Designed for Signaling Rates(1) of up to 30
Mbps
•Bus-Pin ESD Protection Exceeds 12 kV HBM
•Very Low Disabled Supply-Current
Requirements . . . 700 μA Max
•Common-Mode Voltage Range of –7Vto12V
•Low Supply Current . . .15 mA Max
•Compatible With ANSI Standard TIA/EAI-485-A
and ISO8482: 1987(E) LOGIC DIAGRAM (POSITIVE LOGIC)
•Positive and Negative Output Current Limiting
•Driver Thermal Shutdown Protection
(1)Signaling rate by TIA/EIA-485-A definition restrict transition times
to 30% of the bit length, and much higher signaling rates may be
achieved without this requirement as displayed in the TYPICAL
CHARACTERISTICS of this device.
DESCRIPTION
The SN65LBC179A and SN75LBC179A 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 are compatible with ANSI standard
TIA/EIA-485-A and ISO 8482:1987(E). The A version offers improved switching performance over its
predecessors without sacrificing significantly more power.
The SN65LBC179A and SN75LBC179A combine a differential line driver and differential input 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 (VCC = 0). These parts feature a wide positive and negative 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 SN65LBC179A is characterized over the industrial temperature range of –40°C to 85°C. The SN75LBC179A
is characterized for operation over the commercial temperature range of 0°C to 70°C.
FUNCTION TABLE(1)
DRIVER RECEIVER
DIFFERENTIAL INPUTS OUTPUT
OUTPUTS
INPUT A–B R
DY Z VID ≥0.2 V H
H H L -0.2 V <VID <0.2 V ?
L L H VID ≤-0.2 V L
OPEN H L Open circuit H
(1) H = high level, L = low level, ? = indeterminate
1Please 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.
2LinBiCMOS is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Copyright ©2000–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
1 kΩ
8 V
Input
VCC
Input
100 kΩ 4 kΩ
18 kΩ
4 kΩ
16 V
16 V
Input
100 kΩ
4 kΩ
18 kΩ
4 kΩ
16 V
16 V
VCC VCC
16 V
16 V
Output
VCC
Output
VCC
D Inputs
A Input B Input
Y AND Z Outputs
R Output
40 Ω
8 V
100 kΩ
Receiver
Receiver
SN65LBC179A
SN75LBC179A
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
AVAILABLE OPTIONS
PACKAGE
TASMALL OUTLINE PLASTIC
(D) DUAL-IN-LINE
0°C to 70°C SN75LBC179AD SN75LBC179AP
–40°C to 85°C SN65LBC179AD SN65LBC179AP
SCHEMATICS OF INPUTS AND OUTPUTS
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Product Folder Link(s): SN65LBC179A SN75LBC179A
SN65LBC179A
SN75LBC179A
www.ti.com
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted) UNIT
VCC Supply voltage range(2) –0.3 V to 6 V
A, B, Y, or Z(2) –10 V to 15 V
Voltage range D or R(2) –0.3 V to VCC + 0.5 V
IOReceiver output current ±20 mA
Bus terminals and GND, Class 3, A(3) 12 kV
Bus terminals and GND, Class 3, B(3) 400 V
Electrostatic discharge All terminals, Class 3, A 3 kV
All terminals, Class 3, B 400 V
Continuous total power dissipation(4) Internally limited
Total power dissipation See Dissipation Rating Table
(1) 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.
(2) All voltage values, except differential I/O bus voltages, are with respect to GND.
(3) Tested in accordance with MIL-STD-883C, Method 3015.7
(4) The maximum operating junction temperature is internally limited. Uses the dissipation rating table to operate below this temperature.
DISSIPATION RATINGS
PACKAGE TA≤25°C DERATING FACTOR(1) TA= 70°C TA= 85°C
POWER RATING ABOVE TA= 25°C POWER RATING POWER RATING
D 725 mW 5.8 mW/°C 464 mW 377 mW
P 1100 mW 8.08 mW/°C 640 mW 520 mW
(1) This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow.
RECOMMENDED OPERATING CONDITIONS MIN NOM MAX UNIT
VCC Supply voltage 4.75 5 5.25 V
VIH High-level input voltage D 2 VCC V
VIL Low-level input voltage D 0 0.8 V
VID Differential input voltage(1) –12(2) 12 V
VO
VIVoltage at any bus terminal (separately or common-mode) A, B, Y, or Z –7 12 V
VIC Y or Z –60
IOH High-level output current mA
R–8
Y or Z 60
IOL Low-level output current mA
R 8
SN65LBC179A –40 85
TAOperating free-air temperature °C
SN75LBC179A 0 70
(1) Differential input/output bus voltage is measured at the noninverting terminal with respect to the inverting terminal.
(2) The algebraic convention, in which the least positive (most negative) limit is designated as minimum, is used in this data sheet.
Copyright ©2000–2011, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): SN65LBC179A SN75LBC179A
SN65LBC179A
SN75LBC179A
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
www.ti.com
DRIVER ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
VIK Input clamp voltage II=–18 mA –1.5 –0.8 V
SN65LBC179A 1 1.5 3
RL= 54 Ω, See Figure 1 V
SN75LBC179A 1.1 1.5 3
|VOD| Differential output voltage SN65LBC179A 1 1.5 3
RL= 60 Ω,–7<V(tot) <12, V
See Figure 2 SN75LBC179A 1.1 1.5 3
Change in magnitude of differential output
Δ| VOD | See Figure 1 and Figure 2 –0.2 0.2 V
voltage (2)
Steady-state common-mode output
VOC(SS) 1.8 2.4 2.8 V
voltage See Figure 1
Change in steady-state common-mode
ΔVOC(SS) –0.1 0.1 V
output voltage(2)
IOOutput current with power off VCC = 0, VO=–7 V to 12 V –10 ±1 10 μA
IIH High-level input current VI= 2.V –100 μA
IIL Low-level input current VI= 0.8 V –100 μA
IOS Short-circuit output current –7 V ≤VO≤12 V –250 ±70 250 mA
ICC Supply current No load, VI= 0 or VCC 8.5 15 mA
(1) All typical values are at VCC = 5 V, TA= 25°C.
(2) Δ| VOD | and Δ| 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.
DRIVER SWITCHING CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tPLH Propagation delay time, low-to-high-level output 2 6 12 ns
tPHL Propagation delay time, high-to-low-level output 2 6 12 ns
tsk(p) Pulse skew ( | tPHL –tPLH | ) RL= 54 Ω, CL= 50 pF, See Figure 3 0.3 1 ns
trDifferential output signal rise time 4 7.5 11 ns
tfDifferential output signal fall time 4 7.5 11 ns
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Product Folder Link(s): SN65LBC179A SN75LBC179A
VOD
0 V or 3 V
Z
D
Y
VOC
27 Ω
27 Ω
VOD
V(test )
R1
375 Ω
0 V or 3 V
Z
D
R2
375 Ω
V(test )
Y
RL = 60 Ω
−7 V < V(test) < 12 V
SN65LBC179A
SN75LBC179A
www.ti.com
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
RECEIVER SECTION
RECEIVER ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VIT+ Positive-going input threshold voltage IO=–8 mA 0.2 V
VIT–Negative-going input threshold voltage –0.2
IO= 8 mA
Vhys Hysteresis voltage ( VIT+ –VIT–) 50 mV
VOH High-level output voltage VID = 200 mV, IOH =–8 mA, See Figure 1 4 4.9 V
VOL Low-level output voltage VID =–200 mV, IOL = 8 mA, See Figure 1 0.1 0.8 V
VIH = 12 V, VCC = 5 V 0.4 1
VIH = 12 V, VCC = 0 0.5 1
IIBus input current Other input at 0 V mA
VIH =–7 V, VCC = 5 V –0.8 –0.4
VIH =–7 V, VCC = 0 –0.8 –0.3
RECEIVER SWITCHING CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tPLH Propagation delay time, low-to-high-level output 7 13 20 ns
tPHL Propagation delay time, high-to-low-level output 7 13 20 ns
VID =–1.5 V to 1.5 V, See Figure 4
tsk(p) Pulse skew ( | tPLH –tPHL | ) 0.5 1.5 ns
trRise time, output 2.1 3.3 ns
tfFall time, output See Figure 4 2.1 3.3 ns
PARAMETER MEASURMENT INFORMATION
Figure 1. Driver VOD and VOC
Figure 2. Driver VOD With Common-Mode Loading
Copyright ©2000–2011, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): SN65LBC179A SN75LBC179A
VOLTAGE WAVEFORMS
50%
tf
tPHL
10%
tr
≈ 1.5 V
≈ − 1.5 V
90%
50%
Output
tPLH
0 V
3 V
1.5 V
Input
TEST CIRCUIT
Output
CL = 50 pF
(see Note B)
RL = 54 Ω
50 Ω
Generator
(see Note A)
1.5 V
TEST CIRCUIT VOLTAGE WAVEFORMS
VOL
VOH
3 V
0 V
tPHL
tPLH
Output
Input
1.3 V
1.5 V
1.3 V
50 ΩOutput
1.5 V
Generator
(see Note A)
A
B
tr
90%
10%10%
90%
tf
CL = 15 pF
(see Note B)
1.5 V
SN65LBC179A
SN75LBC179A
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
www.ti.com
PARAMETER MEASURMENT INFORMATION (continued)
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= 50 Ω.
B. CLincludes probe and jig capacitance.
Figure 3. Driver Test Circuits and Voltage Waveforms
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= 50 Ω.
B. CL includes probe and jig capacitance.
Figure 4. Receiver Test Circuit and Voltage Waveforms
6Submit Documentation Feedback Copyright ©2000–2011, Texas Instruments Incorporated
Product Folder Link(s): SN65LBC179A SN75LBC179A
Driver Input Receiver Output
120 Ω120 Ω
Receiver Output
Driver Input
−15
−10
−5
00 1 2 3
−20
−25
V − Input Voltage − V
−30
4 5
II− Logic Input Current − Aµ
I
SN65LBC179A
SN75LBC179A
www.ti.com
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
TYPICAL CHARACTERISTICS
Figure 5. Typical Waveform of Non-Return-To-Zero (NRZ), Pseudorandom Binary Sequence (PRBS)
Data at 100 Mbps Through 15m, of CAT 5 Unshielded Twisted Pair (UTP) Cable
TIA/EIA-485-A defines a maximum signaling rate as that in which the transition time of the voltage transition of a
logic-state change remains less than or equal to 30% of the bit length. Transition times of greater length perform
quite well even though they do not meet the standard by definition.
AVERAGE SUPPLY CURRENT LOGIC INPUT CURRENT
vs vs
FREQUENCY INPUT VOLTAGE
Figure 6. Figure 7.
Copyright ©2000–2011, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Link(s): SN65LBC179A SN75LBC179A
VI − Input Voltage − V
−600
−400
−200
0
200
400
600
800
−8 −6 −4 −2 0 2 4 6 8 10 12
Bus Input Current
− Input Current −
IIAµ
IOL − Low-Level Output Current − mA
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0 10 20 30 40 50 60 70 80
VCC = 5
− Low-Level Output Voltage − V
VOL
1.5
1
0.5
0−40 0 25 70 85
2
Average Case Temperature − C
°
− Driver Differential Output Voltage − V
VOD
3.5
3
2.5
2
0 −10 −20 −30 −40 −50 −60
4
4.5
I − High-Level Output Current − (mA)
5
−70 −80
OH
VOH − Driver High-Level Output Voltage − V
1.5
1
0.5
0
VCC = 4.75 V
VCC = 5 V
VCC = 5.25 V
SN65LBC179A
SN75LBC179A
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
www.ti.com
TYPICAL CHARACTERISTICS (continued)
INPUT CURRENT LOW-LEVEL OUTPUT VOLTAGE
vs vs
INPUT VOLTAGE LOW-LEVEL OUTPUT CURRENT
Figure 8. Figure 9.
DRIVER HIGH-LEVEL OUTPUT VOLTAGE DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs vs
HIGH-LEVEL OUTPUT CURRENT AVERAGE CASE TEMPERATURE
Figure 10. Figure 11.
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Product Folder Link(s): SN65LBC179A SN75LBC179A
13.5
13.4
13.3
12.9
−40 0 25
− Receiver Propagation Time − ns
13.6
13.7
Case Temperature C
13.8
70 80
°
13.1
13
13.2
TTPHL
6.8
6.6
6.4
6.2
−40 0 25 70
Driver Propagation Delay Time − ns
7
7.2
Case Temperature − C
7.4
85
°
6
5.8
5.6
TPHL −
15
−10
−35
−60
0 3 4
40
65
90
5 6
I − Driver Output Current − mA
O
−135
−160
−185
−210
−110
−85
VCC − Supply Voltage − V
IOH
IOL
SN65LBC179A
SN75LBC179A
www.ti.com
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
TYPICAL CHARACTERISTICS (continued)
RECEIVER PROPAGATION TIME DRIVER PROPAGATION DELAY TIME
vs vs
CASE TEMPERATURE CASE TEMPERATURE
Figure 12. Figure 13.
DRIVER OUTPUT CURRENT
vs
SUPPLY VOLTAGE
Figure 14.
Copyright ©2000–2011, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s): SN65LBC179A SN75LBC179A
SN65LBC179A
SN75LBC179A
SLLS377D –MAY 2000–REVISED SEPTEMBER 2011
www.ti.com
REVISION HISTORY
Changes from Revision C (June 2001) to Revision D Page
•Changed the D Output and R Output schematins ................................................................................................................ 2
•Added Receiver output current to the Abs Max Table .......................................................................................................... 3
•Changed ESD - All terminals, Class 3, A From: 4 kV To: 3 kV ............................................................................................ 3
10 Submit Documentation Feedback Copyright ©2000–2011, Texas Instruments Incorporated
Product Folder Link(s): SN65LBC179A SN75LBC179A
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
SN65LBC179AD ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN65LBC179ADG4 ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN65LBC179ADR ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN65LBC179ADRG4 ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN65LBC179AP ACTIVE PDIP P 8 50 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN65LBC179APE4 ACTIVE PDIP P 8 50 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN75LBC179AD ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN75LBC179ADG4 ACTIVE SOIC D 8 75 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN75LBC179ADR ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN75LBC179ADRG4 ACTIVE SOIC D 8 2500 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN75LBC179AP ACTIVE PDIP P 8 50 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN75LBC179APE4 ACTIVE PDIP P 8 50 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
PACKAGE OPTION ADDENDUM
www.ti.com 18-Jul-2006
Addendum-Page 1
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 18-Jul-2006
Addendum-Page 2
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
SN65LBC179ADR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
SN75LBC179ADR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 5-May-2010
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN65LBC179ADR SOIC D 8 2500 340.5 338.1 20.6
SN75LBC179ADR SOIC D 8 2500 340.5 338.1 20.6
PACKAGE MATERIALS INFORMATION
www.ti.com 5-May-2010
Pack Materials-Page 2
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