SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
TIA/EIA-422-B, TIA/EIA-485-A, and ITU
Recommendation V.11
D
Bus Voltage Range...–7 V to 12 V
D
Positive- and Negative-Current Limiting
D
Driver Output Capability...60 mA Max
D
Driver Thermal-Shutdown Protection
D
Receiver Input Impedance...12 kΩ Min
D
Receiver Input Sensitivity...±200 mV
D
Receiver Input Hysteresis...50 mV Typ
D
Operates From Single 5-V Supply
D
Low Power Requirements
description
The SN75179B is a differential driver and receiver pair designed for balanced transmission-line applications
and meets TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. It is designed to improve the
performance of full-duplex data communications over long bus lines.
The SN75179B driver output provides limiting for both positive and negative currents. The receiver features high
input impedance, input hysteresis for increased noise immunity, and input sensitivity of ± 200 mV over a
common-mode input voltage range of –7 V to 12 V. The driver provides thermal shutdown for protection from
line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C.
The SN75179B is designed to drive current loads of up to 60 mA maximum.
The SN75179B is characterized for operation from 0°C to 70°C.
Function Tables
DRIVER
INPUT
OUTPUTS
D
Y Z
H H L
L L H
RECEIVER
DIFFERENTIAL INPUTS
OUTPUT
A – B R
VID ≥ 0.2 V H
–0.2 V < VID < 0.2 V ?
VID ≤ –0.2 V L
Open ?
H = high level, L = low level, ? = indeterminate
Copyright 1998, 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.
1
2
3
4
8
7
6
5
V
CC
R
D
GND
A
B
Z
Y
D OR P PACKAGE
(TOP VIEW)
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
D
R
3
2
Y
Z
B
A
5
6
7
8
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram (positive logic)
D
R
3
2
Y
Z
B
A
5
6
7
8
schematics of inputs and outputs
TYPICAL OF ALL RECEIVER OUTPUTS
TYPICAL OF ALL DRIVER OUTPUTS
EQUIVALENT OF EACH RECEIVER INPUT
EQUIVALENT OF DRIVER INPUT
Output
V
CC
85 Ω
NOM
Input
V
CC
16.8 kΩ
NOM
960 Ω
NOM
GND
Output
V
CC
Driver input: R
(eq)
= 3 kΩ NOM
R
(eq)
= equivalent resistor
Input
V
CC
960 Ω
NOM
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range at any bus terminal –10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage, V
ID
(see Note 2) ±25 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
JA
(see Note 3):D package 197°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P package 104°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–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 affect device reliability.
NOTES: 1. All voltage values, except differential input voltage, are with respect to network ground terminal.
2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting input.
3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
Driver 2 V
Low-level input voltage, V
IL
Driver 0.8 V
Common-mode input voltage, V
IC
–7
‡
12 V
Differential input voltage, V
ID
±12 V
p
Driver –60 mA
High-level output current, I
OH
Receiver –400 µA
p
Driver 60
Low-level output current, I
OL
Receiver 8
mA
Operating free-air temperature, T
A
0 70 °C
‡
The algebraic convention, where the less positive (more negative) limit is designated minimum, is used in this data sheet for common-mode input
voltage and threshold voltage.
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IK
Input clamp voltage II = -18 mA –1.5 V
V
O
Output voltage
IO
= 0 0 6 V
V
OD1
Differential output voltage IO = 0 1.5 6 V
V
OD2
Differential output voltage
RL = 100 Ω, See Figure 1
1/2V
OD1
or 2
‡
V
OD2
g
RL = 54 Ω, See Figure 1 1.5 2.5 5 V
V
OD3
Differential output voltage See Note 4 1.5 5 V
∆VOD
Change in magnitude of common-mode
output voltage
§
±0.2 V
V
OC
Common-mode output voltage RL = 54 Ω or 100 Ω, See Figure 1
3
–1
V
∆VOC
Change in magnitude of common-mode
output voltage
§
±0.2 V
I
O
Output current VCC = 0, VO = –7 V to 12 V ±100 µA
I
IH
High-level input current VI = 2.4 V 20 µA
I
IL
Low-level input current VI = 0.4 V –200 µA
p
VO = –7 V –250
IOSShort-circuit output current
VO = VCC or 12 V 250
mA
I
CC
Supply current (total package) No load 57 70 mA
†
All typical values are at VCC = 5 V and TA = 25°C.
‡
The minimum V
OD2
with 100-Ω load is either 1/2 V
OD2
or 2 V, whichever is greater.
§
∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input changes from a high level to a low
level.
NOTE 4: See TIA/EIA-485-A, Figure 3.5, Test T ermination Measurement 2.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d(OD)
Differential output delay time
15 22 ns
t
t(OD)
Differential output transition time
R
L
=
54 Ω
,
See Figure 3
20 30 ns
Symbol Equivalents
DATA-SHEET PARAMETER TIA/EIA-422-B TIA/EIA-485-A
V
O
Voa, V
ob
Voa, V
ob
|V
OD1
| V
o
V
o
|V
OD2
| Vt (RL = 100 Ω) Vt (RL = 54 Ω)
|V
OD3
| Vt (T est Termination Measurement 2)
∆|VOD| ||Vt|–|V
t
||
||Vt|–|V
t
||
V
OC
|Vos| |Vos|
∆|VOC| |Vos–Vos| |Vos–Vos|
I
OS
|Isa|, |Isb|
I
O
|Ixa|, |Ixb| Iia, I
ib
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
IT+
Positive-going input threshold voltage VO = 2.7 V, IO = –0.4 mA 0.2 V
V
IT–
Negative-going input threshold voltage VO = 0.5 V, IO = 8 mA –0.2
‡
V
V
hys
Hysteresis voltage (V
IT+
– V
IT–
) 50 mV
V
OH
High-level output voltage VID = 200 mV , IOH = –400 µA, See Figure 2 2.7 V
V
OL
Low-level output voltage VID = –200 mV, IOL = 8 mA, See Figure 2 0.45 V
p
p
VI = 12 V 1
IILine input current
Other input at 0 V
,
See Note 5
VI = –7 V –0.8
mA
r
i
Input resistance 12 kΩ
I
OS
Short-circuit output current –15 –85 mA
I
CC
Supply current (total package) No load 57 70 mA
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
The algebraic convention, where 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.
NOTE 5: Refer to TIA/EIA-422-B for exact conditions.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PLH
Propagation delay time, low- to high-level output
VID = –1.5 V to 1.5 V ,
19 35 ns
t
PHL
Propagation delay time, high- to low-level output
ID
CL = 15 pF, See Figure 4
30 40 ns
PARAMETER MEASUREMENT INFORMATION
V
OD2
R
L
2
V
OC
R
L
2
Figure 1. Driver VDD and V
OC
V
ID
–I
OH
V
OH
+
I
OL
V
OL
Figure 2. Receiver VOH and V
OL
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION (CONTINUED)
t
t(OD)
t
t(OD)
50%50%
10%
90%
t
d(OD)
t
d(OD)
Output
Input
≈ 2.5 V
0 V
3 V
1.5 V1.5 V
Output
CL = 50 pF
(see Note B)
RL = 54 Ω
50 Ω
≈ – 2.5 V
TEST CIRCUIT VOLTAGE WAVEFORMS
Generator
(see Note A)
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 = 50 Ω.
B. CL includes probe and jig capacitance.
Figure 3. Driver Test Circuit and Voltage Waveforms
VOLTAGE WAVEFORMSTEST CIRCUIT
V
OL
V
OH
1.3 V
t
PHL
t
PLH
1.5 V
50 Ω
Output
Input
0 V
3 V
1.5 V
Output
Generator
(see Note A)
CL = 50 pF
(see Note B)
1.5 V
1.3 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 = 50 Ω.
B. CL includes probe and jig capacitance.
Figure 4. Receiver Test Circuit and Voltage Waveforms
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
2.5
1.5
1
0
0 – 20 – 40 –60
– High-Level Output Voltage – V
3.5
4
DRIVER
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
5
– 80 – 100 – 120
V
OH
4.5
3
2
0.5
IOH – High-Level Output Current – mA
VCC = 5 V
TA = 25°C
Figure 5
DRIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
Figure 6
2.5
2
1
0
0204060
– Low-Level Output Voltage – V
3.5
4
5
80 100 120
4.5
3
1.5
0.5
V
OL
IOL – Low-Level Output Current – mA
VCC = 5 V
TA = 25°C
2
1.5
0.5
0
0102030405060
– Differential Output Voltage – V
2.5
3.5
DRIVER
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
4
70 80 90 100
1
3
OD
V
IO – Output Current – mA
VCC = 5 V
TA = 25°C
Figure 7
V
IT+
V
IT+
2.5
2
1
0.5
0
4.5
1.5
–125 –100 –75 – 50 – 25 0 25
3.5
3
4
RECEIVER
OUTPUT VOLTAGE
vs
DIFFERENTIAL INPUT VOLTAGE
5
50 75 100 125
VID – Differential Input Voltage – mV
– Output Voltage – V
V
O
VCC = 5 V IO = 0 TA = 25°C
V
IT–
V
IT+
VIC =
–12 V
VIC =
12 V
V
IT–
V
IT–
VIC =
0
Figure 8
SN75179B
DIFFERENTIAL DRIVER AND RECEIVER PAIR
SLLS003E – OCTOBER 1985 – REVISED JUNE 1998
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
2.5
2
1
0.5
0
4.5
1.5
0 – 5 – 10 – 15 – 20 – 25 – 30
– High-Level Output Voltage – V
3.5
3
4
5
– 35 – 40 – 45 – 50
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
IOH – High-Level Output Current – mA
V
OH
VCC = 4.75 V
VID = 0.2 V
TA = 25°C
VCC = 5 V
VCC = 5.25 V
Figure 9
2.5
2
1
0.5
0
4.5
1.5
0102030405060
3.5
3
4
HIGH-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
5
70 80 90
– High-Level Output Voltage – V
V
OH
TA – Free-Air Temperature – °C
VCC = 5 V
VID = 0.2 V
IOH = –440 µA
Figure 10
RECEIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
0.3
0.2
0.1
0
0510
0.4
0.5
0.6
15 20 25
30
– Low-Level Output Voltage - V
V
OL
IOL – Low-Level Output Current – mA
VCC = 5 V
TA = 25°C
Figure 11
0.2
0.1
0
0102030405060
0.3
0.4
RECEIVER
LOW-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
0.5
70 80 90
– Low-Level Output Voltage – V
V
OL
TA – Free-Air Temperature – °C
VCC = 5 V
VID = –0.2 V
IOL = 8 mA
Figure 12
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright 1998, Texas Instruments Incorporated
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