SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
High-Speed Low-Power LinBiCMOS
Circuitry Designed for Signaling Rates† of
up to 30 Mbps
D
Bus-Pin ESD Protection Exceeds 12 kV
HBM
D
Very Low Disabled Supply-Current
Requirements ...700 µA Max
D
Common-Mode Voltage Range of –7 V
to 12 V
D
Low Supply Current . . . 15 mA Max
D
Compatible With ANSI Standard
TIA/EAI-485-A and ISO8482: 1987(E)
D
Positive and Negative Output Current
Limiting
D
Driver Thermal Shutdown Protection
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.
†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.
Copyright 2001, 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.
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.
logic diagram (positive logic)
R
D
B
A
Z
Y
7
8
6
5
2
3
INPUT
DOUTPUTS
Y Z
DRIVER
DIFFERENTIAL INPUTS
A–B
VID ≥ 0.2 V
–0.2 V < VID < 0.2 V
VID ≤ – 0.2 V
Open circuit
OUTPUT
R
H
?
L
H
RECEIVER
H = high level, L = low level,
? = indeterminate
Function Tables
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)
H
L
Open
H
L
H
L
H
L
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGE
TASMALL 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
1 kΩ
8 V
Input
VCC
Input
100 kΩ4 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
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings†
Supply voltage range, VCC (see Note 1) –0.3 V to 6 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic discharge:Bus terminals and GND, Class 3, A: (see Note 2) 12 kV. . . . . . . . . . . . . . . . . . . . . . . .
Bus terminals and GND, Class 3, B: (see Note 2) 400 V. . . . . . . . . . . . . . . . . . . . . . . .
All terminals, Class 3, A: 4 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
All terminals, Class 3, B: 400 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation (see Note 3) Internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 af fect device reliability.
NOTES: 1. All voltage values, except differential I/O bus voltages, are with respect to GND.
2. Tested in accordance with MIL–STD–883C, Method 3015.7
3. The maximum operating junction temperature is internally limited. Uses the dissipation rating table to operate below this
temperature.
DISSIPATION RATING TABLE
PACKAGE TA ≤ 25°C
POWER RATING DERATING FACTOR‡
ABOVE TA = 25°CTA = 70°C
POWER RATING TA = 85°C
POWER RATING
D725 mW 5.8 mW/°C464 mW 377 mW
P1100 mW 8.08 mW/°C640 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
MIN NOM MAX UNIT
Supply voltage, VCC 4.75 5 5.25 V
High-level input voltage, VIH D 2 VCC V
Low-level input voltage, VIL D 0 0.8 V
Differential input voltage, VID (see Note 4) –12§12 V
Voltage at any bus terminal (separately or common-mode), VO, VI, or VIC A, B, Y, or Z –7 12 V
High level out
p
ut current IOH
Y or Z –60
mA
High
-
level
output
current
,
I
OH R–8
mA
Low level out
p
ut current IOL
Y or Z 60
mA
Low
-
level
output
current
,
I
OL R 8
mA
O
p
erating free air tem
p
erature TA
SN65LBC179A –40 85 °
C
Operating
free
-
air
temperature
,
T
ASN75LBC179A 0 70
°C
§The algebraic convention, in which the least positive (most negative) limit is designated as minimum, is used in this data sheet.
NOTE 4: Differential input/output bus voltage is measured at the noninverting terminal with respect to the inverting terminal.
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
driver electrical characteristics over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
VIK Input clamp voltage II = –18 mA –1.5 –0.8 V
R
L
= 54 Ω,SN65LBC179A 1 1.5 3
L,
See Figure 1 SN75LBC179A 1.1 1.5 3
|VOD|Differential output voltage RL = 60 Ω,
7<V
()
<12
SN65LBC179A 1 1.5 3 V
–
7
<
V
(tot) <
12
,
See Figure 2 SN75LBC179A 1.1 1.5 3
∆|VOD|Change in magnitude of differential
output voltage (see Note 5) See Figures 1 and 2 –0.2 0.2 V
VOC(SS) Steady-state common-mode output voltage 1.8 2.4 2.8 V
∆VOC(SS) Change in steady-state common-mode output
voltage (see Note 5) See Figure 1 –0.1 0.1 V
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
†All typical values are at VCC = 5 V, TA = 25°C.
NOTE 5: ∆|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.
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
R54Ω
C50F
2 6 12 ns
tsk(p) Pulse skew (| tPHL – tPLH|) RL = 54 Ω,
See Figure 3
CL = 50 pF, 0.3 1 ns
trDifferential output signal rise time
See
Figure
3
4 7.5 11 ns
tfDifferential output signal fall time 4 7.5 11 ns
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
IO=8mA
–0.2
V
Vhys Hysteresis voltage (VIT+ – VIT–)
I
O =
8
mA
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
II
Bus in
p
ut current
VIH = 12 V, VCC = 0
Other in
p
ut at 0 V
0.5 1
mA
I
I
Bus
input
current
VIH = –7 V, VCC = 5 V
Other
input
at
0
V
–0.8 –0.4
mA
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 VID = –1.5 V to 1.5 V, See Figure 4 713 20 ns
tsk(p) Pulse skew (| tPLH – tPHL|) 0.5 1.5 ns
trRise time, output
See Figure 4
2.1 3.3 ns
tfFall time, output
See
Figure
4
2.1 3.3 ns
PARAMETER MEASUREMENT INFORMATION
VOD
0 V or 3 V
Z
D
Y
VOC
27 Ω
27 Ω
Figure 1. Driver VOD and VOC
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
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
Figure 2. Driver VOD With Common-Mode Loading
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
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.
Figure 3. Driver Test Circuits and Voltage Waveforms
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
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.
Figure 4. Receiver Test Circuit and Voltage Waveforms
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Driver Input Receiver Output
120 Ω120 Ω
Receiver Output
Driver Input
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.
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
–15
–10
–5
00123
–20
–25
V – Input Voltage – V
LOGIC INPUT CURRENT
vs
INPUT VOLTAGE
–30
45
II– Logic Input Current –Aµ
I
0
5
10
15
20
25
30
35
40
45
Driver
Receiver
0.05 0.5 1 2 5 10 20
– Average Supply Current – mA
f – Frequency – MHz
AVERAGE SUPPLY CURRENT
vs
FREQUENCY
30
ICC
Figure 6 Figure 7
VI – Input Voltage – V
–600
–400
–200
0
200
400
600
800
–8–6–4–2024681012
INPUT CURRENT
vs
INPUT VOLTAGE
Bus Input Current
– Input Current –
IIAµ
IOL – Low-Level Output Current – mA
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0 1020304050607080
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
VCC = 5
– Low-Level Output Voltage – V
VOL
Figure 8 Figure 9
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
3.5
3
2.5
2
0–10 –20 –30 –40 –50 –60
4
4.5
I – High-Level Output Current – (mA)
DRIVER HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
5
–70 –80
OH
VOH – Driver High-Level Output V oltage – V
1.5
1
0.5
0
VCC = 4.75 V
VCC = 5 V
VCC = 5.25 V 1.5
1
0.5
0–40 0 25 70 85
2
A verage Case Temperature – C
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs
AVERAGE CASE TEMPERATURE
°
– Driver Differential Output Voltage – V
VOD
Figure 10 Figure 11
13.5
13.4
13.3
12.9
–40 0 25
– Receiver Propagation Time – ns
13.6
13.7
Case Temperature C
RECEIVER PROPAGATION TIME
vs
CASE TEMPERATURE
13.8
70 80
°
13.1
13
13.2
6.8
6.6
6.4
6.2
–40 0 25 70
Driver Propagation Delay Time – ns
7
7.2
Case Temperature – C
DRIVER PROPAGATION DELAY TIME
vs
CASE TEMPERATURE
7.4
85
°
6
5.8
5.6
TTPHL
TPHL –
Figure 12 Figure 13
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
15
–10
–35
–60
034
40
65
DRIVER OUTPUT CURRENT
vs
SUPPLY VOLTAGE
90
56
I – Driver Output Current – mA
O
–135
–160
–185
–210
–110
–85
VCC – Supply Voltage – V
IOH
IOL
Figure 14
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL INFORMATION
D (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
4040047/D 10/96
0.228 (5,80)
0.244 (6,20)
0.069 (1,75) MAX 0.010 (0,25)
0.004 (0,10)
1
14
0.014 (0,35)
0.020 (0,51)
A
0.157 (4,00)
0.150 (3,81)
7
8
0.044 (1,12)
0.016 (0,40)
Seating Plane
0.010 (0,25)
PINS **
0.008 (0,20) NOM
A MIN
A MAX
DIM
Gage Plane
0.189
(4,80)
(5,00)
0.197
8
(8,55)
(8,75)
0.337
14
0.344
(9,80)
16
0.394
(10,00)
0.386
0.004 (0,10)
M
0.010 (0,25)
0.050 (1,27)
0°–8°
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
SN65LBC179A, SN75LBC179A
LOW-POWER DIFFERENTIAL LINE DRIVER AND RECEIVER PAIRS
SLLS377C – MAY 2000 – REVISED JUNE 2001
12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
MECHANICAL INFORMATION
P (R-PDIP-T8) PLASTIC DUAL-IN-LINE
8
4
0.015 (0,38)
Gage Plane
0.325 (8,26)
0.300 (7,62)
0.010 (0,25) NOM
MAX
0.430 (10,92)
4040082/D 05/98
0.200 (5,08) MAX
0.125 (3,18) MIN
5
0.355 (9,02)
0.020 (0,51) MIN
0.070 (1,78) MAX
0.240 (6,10)
0.260 (6,60)
0.400 (10,60)
1
0.015 (0,38)
0.021 (0,53)
Seating Plane
M
0.010 (0,25)
0.100 (2,54)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001
For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm
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