SN65LBC179A
SN75LBC179A
SLLS377D – MAY 2000 – REVISED SEPTEMBER 2011
www.ti.com
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
Check for Samples: SN65LBC179A, SN75LBC179A
FEATURES
1
•
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 –7 V to 12 V
Low Supply Current . . .15 mA Max
Compatible With ANSI Standard TIA/EAI-485-A
and ISO8482: 1987(E)
Positive and Negative Output Current Limiting
Driver Thermal Shutdown Protection
SN65LBC179AD (Marked as BL179A)
SN65LBC179AP (Marked as 65LBC179A)
SN75LBC179AD (Marked as LB179A)
SN75LBC179AP (Marked as 75LBC179A)
(TOP VIEW)
VCC
R
D
GND
1
8
2
7
3
6
4
5
A
B
Z
Y
LOGIC DIAGRAM (POSITIVE LOGIC)
R
(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.
D
8
2
7
5
3
6
A
B
Y
Z
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
INPUT
D
(1)
RECEIVER
DIFFERENTIAL INPUTS
A–B
OUTPUT
R
Z
VID ≥ 0.2 V
H
?
OUTPUTS
Y
H
H
L
-0.2 V < VID < 0.2 V
L
L
H
VID ≤ -0.2 V
L
OPEN
H
L
Open circuit
H
H = high level, L = low level, ? = indeterminate
1
2
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2011, Texas Instruments Incorporated
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
TA
SMALL OUTLINE
(D)
PLASTIC
DUAL-IN-LINE
0°C to 70°C
SN75LBC179AD
SN75LBC179AP
–40°C to 85°C
SN65LBC179AD
SN65LBC179AP
SCHEMATICS OF INPUTS AND OUTPUTS
D Inputs
VCC
100 kΩ
1 kΩ
Input
8V
A Input
B Input
VCC
16 V
100 kΩ
VCC
16 V
4 kΩ
4 kΩ
18 kΩ
18 kΩ
Input
Input
100 kΩ
16 V
16 V
4 kΩ
4 kΩ
Y AND Z Outputs
VCC
R Output
VCC
16 V
Receiver
40 Ω
Output
Output
8V
16 V
Receiver
2
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Copyright © 2000–2011, Texas Instruments Incorporated
Product Folder Link(s): SN65LBC179A SN75LBC179A
SN65LBC179A
SN75LBC179A
SLLS377D – MAY 2000 – REVISED SEPTEMBER 2011
www.ti.com
ABSOLUTE MAXIMUM RATINGS (1)
over operating free-air temperature range (unless otherwise noted)
UNIT
VCC
Supply voltage range
(2)
Voltage range
IO
–0.3 V to 6 V
A, B, Y, or Z (2)
–10 V to 15 V
D or R (2)
–0.3 V to VCC + 0.5 V
±20 mA
Receiver output current
(3)
12 kV
Bus terminals and GND, Class 3, B (3)
400 V
Bus terminals and GND, Class 3, A
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
(1)
(2)
(3)
(4)
See Dissipation Rating Table
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.
All voltage values, except differential I/O bus voltages, are with respect to GND.
Tested in accordance with MIL-STD-883C, Method 3015.7
The maximum operating junction temperature is internally limited. Uses the dissipation rating table to operate below this temperature.
DISSIPATION RATINGS
(1)
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR (1)
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
D
725 mW
5.8 mW/°C
464 mW
377 mW
P
1100 mW
8.08 mW/°C
640 mW
520 mW
This is the inverse of the junction-to-ambient thermal resistance when board-mounted and with no air flow.
RECOMMENDED OPERATING CONDITIONS
VCC
Supply voltage
VIH
High-level input voltage
D
VIL
Low-level input voltage
D
VID
Differential input voltage (1)
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
2
VCC
V
0
0.8
V
–12 (2)
12
V
–7
12
V
VO
VI
Voltage at any bus terminal (separately or common-mode)
A, B, Y, or Z
VIC
IOH
High-level output current
IOL
Low-level output current
TA
Operating free-air temperature
(1)
(2)
Y or Z
R
–60
mA
–8
Y or Z
60
R
8
SN65LBC179A
–40
85
SN75LBC179A
0
70
mA
°C
Differential input/output bus voltage is measured at the noninverting terminal with respect to the inverting terminal.
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
Product Folder Link(s): SN65LBC179A SN75LBC179A
Submit Documentation Feedback
3
SN65LBC179A
SN75LBC179A
SLLS377D – MAY 2000 – REVISED SEPTEMBER 2011
www.ti.com
DRIVER ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted)
PARAMETER
VIK
II = –18 mA
Input clamp voltage
Differential output voltage
MAX
–1.5
–0.8
SN65LBC179A
1
1.5
3
SN75LBC179A
1.1
1.5
3
RL = 60 Ω, –7
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