INPUT
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
D
Meets or Exceeds the Requirements of
ANSI Standards EIA/TIA-422-B and RS-485
and ITU Recommendation V.11
D
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
D
3-State Outputs
D
Common-Mode Output Voltage Range of
–7 V to 12 V
D
Active-High and Active-Low Enables
D
Thermal Shutdown Protection
D
Positive- and Negative-Current Limiting
D
Operates From Single 5-V Supply
D
Logically Interchangeable With AM26LS31
description
The SN75172 is a monolithic quadruple
differential line driver with 3-state outputs. It is
designed to meet the requirements of ANSI
Standards EIA/TIA-422-B and RS-485 and ITU
Recommendation V.11. The device is optimized
for balanced multipoint bus transmission at rates
of up to 4 megabaud. Each driver features wide
positive and negative common-mode output
voltage ranges, making it suitable for party-line
applications in noisy environments.
N PACKAGE
(TOP VIEW)
1A
1
1Y
2
1Z
3
G
4
5
2Z
6
2Y
7
2A
GND
GND
8
DW PACKAGE
(TOP VIEW)
1A
1
1Y
2
NC
3
1Z
4
G
5
2Z
6
NC
7
2Y
8
2A
9
10
NC – No internal connection
16
15
14
13
12
11
10
20
19
18
17
16
15
14
13
12
11
V
CC
4A
4Y
4Z
G
3Z
3Y
9
3A
V
CC
4A
4Y
NC
4Z
G
3Z
NC
3Y
3A
The SN75172 provides positive- and negative-current limiting and thermal shutdown for protection from line
fault conditions on the transmission bus line. Shutdown occurs at a junction temperature of approximately
150°C. This device offers optimum performance when used with the SN75173 or SN75175 quadruple
differential line receivers.
The SN75172 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each driver)
INPUT
A
H H X H L
L H XLH
H XLHL
L XLLH
X LHZZ
H = high level, L = low level, X = irrelevant,
Z = high impedance (off)
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.
ENABLES OUTPUTS
G G Y Z
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 1995, Texas Instruments Incorporated
1
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
4
12
1
7
9
15
†
≥1
EN
2
1Y
3
1Z
6
2Y
5
2Z
10
3Y
11
3Z
14
4Y
13
4Z
logic diagram (positive logic)
4
G
12
G
1
1A
7
2A
9
3A
15
4A
10
11
14
13
2
1Y
3
1Z
6
2Y
5
2Z
3Y
3Z
4Y
4Z
‡
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
logic symbol
G
G
1A
2A
3A
4A
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Terminal numbers shown are for the N package.
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage, V
Voltage range at any bus terminal –10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
Storage temperature range, T
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
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.
NOTE 1: All voltage values are with respect to the network ground terminal.
DISSIPATION RATING TABLE
PACKAGE
DW 1125 mW 9.0 mW/°C 720 mW
N 1150 mW 9.2 mW/°C 736 mW
2
TA ≤ 25°C
POWER RATING
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
R
100 Ω
See Figure 1
OD1
V
V
C
¶
R
100 Ω
See Figure 1
V
ICCSupply current (all drivers)
No load
mA
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
High-level input voltage, V
Low-level input voltage, V
Common-mode output voltage, V
High-level output current, I
Low-level output current, I
Operating free-air temperature, T
CC
IH
IL
OC
OH
OL
A
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
V
O
V
OH
V
OL
|V
|V
V
OD3
∆|VOD|
OC
∆|VOC|
I
O
I
OZ
I
IH
I
IL
I
OS
†
All typical values are at VCC = 5 V and TA = 25°C.
‡
The minimum V
§
∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low
level.
¶
In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage,
VOS.
NOTE 2: See Figure 3-5 of EIA Standard RS-485.
Input clamp voltage II = –18 mA –1.5 V
Output voltage IO = 0 0 6 V
High-level output voltage VIH = 2 V, VIL = 0.8 V, IOH = –33 mA 3.7 V
Low-level output voltage VIH = 2 V, VIL = 0.8 V, IOH = 33 mA 1.1 V
| Differential output voltage IO = 0 1.5 6 V
OD1
=
| Differential output voltage
OD2
Differential output voltage See Note 2 1.5 5 V
Change in magnitude of
differential output voltage
ommon-mode output voltage
Change in magnitude of
common-mode output voltage
Output current with power off VCC = 0, VO = – 7 V to 12 V ±100 µA
High-impedance-state
output current
High-level input current VI = 2.7 V 20 µA
Low-level input current VI = 0.5 V –360 µA
Short-circuit output current
pp
with a 100-Ω load is either 1/2 V
OD2
§
§
L
RL = 54 Ω, See Figure 1 1.5 2.5 5 V
= 54 Ω or
L
VO = – 7 V to 12 V ±100 µA
VO = – 7 V –180
VO = V
VO = 12 V 500
,
,
CC
Outputs enabled 38 60
Outputs disabled 18 40
or 2 V, whichever is greater.
OD1
4.75 5 5.25 V
2 V
–7 to 12 V
0 70 °C
1/2 V
OD1
‡
or 2
0.8 V
–60 mA
60 mA
±0.2 V
+3
–1
±0.2 V
mA
180
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN75172
R
54 Ω
See Figure 2
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
V
O
|V
| V
OD1
|V
| Vt (RL = 100 Ω) Vt (RL = 54 Ω)
OD2
|V
|
OD2
∆|VOD| ||Vt| – |Vt|| ||Vt| – |Vt||
V
OC
∆|VOC| |Vos – Vos| |Vos – Vos|
I
OS
I
O
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d(OD)
t
t(OD)
t
PZH
t
PZL
t
PHZ
t
PLZ
Differential-output delay time
Differential-output transition time
Output enable time to high level RL = 110 Ω, See Figure 3 80 120 ns
Output enable time to low level RL = 110 Ω, See Figure 4 45 80 ns
Output disable time from high level RL = 110 Ω, See Figure 3 78 115 ns
Output disable time from low level RL = 110 Ω, See Figure 4 18 30 ns
EIA/TIA-422-B RS-485
V
|Isa|,|Isb|
|Ixa|,|Ixb| Iia,I
oa, Vob
o
|Vos| |Vos|
L
=
,
V
oa, Vob
V
Vt (Test Termination)
Measurement 2)
o
ib
45 65 ns
80 120 ns
PARAMETER MEASUREMENT INFORMATION
R
L
V
OD2
Figure 1. Differential and Common-Mode Output Voltages
RL =
Generator
(see Note A)
NOTES: A. The input pulse is supplied by a generator having the following characteristics: tr ≤ 5 ns, tf ≤ 5 ns, PRR ≤ 1 MHz, duty cycle = 50%,
B. CL includes probe and stray capacitance.
50 Ω
3 V
3 V or 0
ZO = 50 Ω.
54 Ω
CL = 50 pF
(see Note B)
2
R
L
2
Output
V
OC
Input
Output
t
d(OD)
t
t(OD)
VOLTAGE WAVEFORMSTEST CIRCUIT
50%
90%
10%
3 V
1.5 V1.5 V
0 V
t
d(OD)
≈ 2.5 V
50%
≈ 2.5 V
t
t(OD)
Figure 2. Differential-Output Test CIrcuit and Voltage Waveforms
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Generator
(see Note A)
0 V to 3 V
50 Ω
(see Note C)
3 V
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
PARAMETER MEASUREMENT INFORMATION
S1
Output
RL = 110 Ω
CL = 50 pF
(see Note B)
Input
Output
1.5 V
VOLTAGE WAVEFORMSTEST CIRCUIT
2.3 V
t
PHZ
t
PZH
1.5 V
0.5 V
SN75172
3 V
0 V
V
OH
V
≈ 0 V
off
NOTES. A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, duty cycle = 50%, tr ≤ 5 ns, tf ≤ 5 ns,
ZO = 50 Ω.
B. CL includes probe and stray capacitance.
C. To test the active-low enable G
, ground G and apply an inverted waveform to G.
Figure 3. Test Circuit and Voltage Waveforms
5 V
t
PLZ
0.5 V
3 V
0 V
5 V
V
OL
S1
0 V to 3 V
Generator
(see Note A)
NOTES. A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, duty cycle = 50%, tr ≤ 5 ns, tf ≤ 5 ns,
ZO = 50 Ω.
B. CL includes probe and stray capacitance.
C. To test the active-low enable G
50 Ω
3 V
(see Note C)
TEST CIRCUIT
, ground G and apply an inverted waveform to G.
RL = 110 Ω
Output
CL = 50 pF
(see Note B)
Input
t
PZL
Output
1.5 V
2.3 V
VOLTAGE WAVEFORMS
1.5 V
Figure 4. Test Circuit and Voltage Waveforms
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
TYPICAL CHARACTERISTICS
5
4.5
4
3.5
3
2.5
2
1.5
– High-Level Output Voltge – V
1
OH
V
0.5
0
4
3.5
3
2.5
2
1.5
1
– Differential Output Voltage – V
OD
V
0.5
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
VCC = 5 V
TA = 25°C
0
IOH – High-Level Output Current – mA
Figure 5
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
–100–80–60–40–20
VCC = 5 V
TA = 25°C
–120
5
4.5
4
3.5
3
2.5
2
1.5
– Low-Level Output Voltage – V
1
OL
V
0.5
0
50
40
30
20
10
0
–10
–20
O
IO – Output Current – A
I
–30
–40
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
VCC = 5 V
TA = 25°C
10080604020 1200
IOL – Low-Level Output Current – mA
Figure 6
OUTPUT CURRENT
vs
OUTPUT VOLTAGE
Output Dissabled
TA = 25°C
VCC = 0
VCC = 5 V
0
0
IO – Output Current – mA
908070605040302010
100
Figure 7
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
–50
–25
VO – Output Voltage – V
Figure 8
20151050–5–10–15–20
25
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MA Y 1995
TYPICAL CHARACTERISTICS
SUPPLY CURRENT
SUPPLY VOLTAGE
100
No Load
90
Outputs Enabled
TA = 25°C
80
70
60
50
40
30
CC
I
ICC – Supply Current – mA
20
10
0
0
VCC – Supply Voltage – V
vs
Figure 9
Inputs
Open
Inputs
Grounded
7654321
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
30
No Load
Input Open
25
Output Enabled
TA = 25°C
20
15
10
CC
I
ICC – Supply Current – mA
5
8
0
0
VCC – Supply Voltage – V
7654321
8
Figure 10
APPLICATION INFORMATION
1/4 SN75172
R
T
1/4 SN75173
NOTE A: The line length should be terminated at both ends in its characteristic impedance (RT = ZO). Stub lengths off the main line should
be kept as short as possible.
Up to 32
RS-485 Unit Load
1/4 SN751741/4 SN751731/4 SN75172 1/4 SN75173
R
T
Figure 11
1/4 SN75174
1/4 SN75175
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
7
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Copyright 1998, Texas Instruments Incorporated
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