TI SN75172N

SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
D
D
D
D
D
D
D
D
D
N PACKAGE
(TOP VIEW)
Meets or Exceeds the Requirements of
ANSI Standards EIA/TIA-422-B and RS-485
and ITU Recommendation V.11
Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
3-State Outputs
Common-Mode Output Voltage Range of
– 7 V to 12 V
Active-High and Active-Low Enables
Thermal Shutdown Protection
Positive- and Negative-Current Limiting
Operates From Single 5-V Supply
Logically Interchangeable With AM26LS31
1A
1Y
1Z
G
2Z
2Y
2A
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
4A
4Y
4Z
G
3Z
3Y
3A
DW PACKAGE
(TOP VIEW)
1A
1Y
NC
1Z
G
2Z
NC
2Y
2A
GND
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.
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
4A
4Y
NC
4Z
G
3Z
NC
3Y
3A
NC – No internal connection
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)
ENABLES
OUTPUTS
G
G
Y
H
H
X
H
L
L
H
X
L
H
H
X
L
H
L
L
X
L
L
H
X
L
H
Z
Z
INPUT
A
Z
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.
Copyright  1995, 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.
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1
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
logic symbol†
G
G
4
12
logic diagram (positive logic)
≥1
G
EN
G
4
12
2
1A
2A
3A
4A
2
1
3
6
7
5
10
9
11
14
15
13
1A
1Y
1
3
1Y
1Z
1Z
6
2Y
2A
2Z
7
5
2Y
2Z
3Y
10
3Z
3A
4Y
9
11
3Y
3Z
4Z
14
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Terminal numbers shown are for the N package.
4A
15
13
4Y
4Z
absolute maximum ratings over operating free-air temperature (unless otherwise noted)‡
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 10 V to 15 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
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 affect device reliability.
NOTE 1: All voltage values are with respect to the network ground terminal.
DISSIPATION RATING TABLE
2
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
DW
1125 mW
9.0 mW/°C
720 mW
N
1150 mW
9.2 mW/°C
736 mW
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• DALLAS, TEXAS 75265
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
recommended operating conditions
Supply voltage, VCC
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
High-level input voltage, VIH
2
V
Low-level input voltage, VIL
0.8
Common-mode output voltage, VOC
– 7 to 12
High-level output current, IOH
Low-level output current, IOL
Operating free-air temperature, TA
0
V
V
– 60
mA
60
mA
70
°C
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VIK
VO
Input clamp voltage
VOH
VOL
High-level output voltage
Low-level output voltage
VIH = 2 V,
VIH = 2 V,
|VOD1|
Differential output voltage
IO = 0
Output voltage
II = – 18 mA
IO = 0
See Figure 1
Differential output voltage
∆|VOD|
Change in magnitude of
differential output voltage§
VOC
Common mode output
Common-mode
o tp t voltage
oltage¶
∆|VOC|
Change in magnitude of
common-mode output voltage§
IO
Output current with power off
VCC = 0,
IOZ
High-impedance-state
output current
IOH = – 33 mA
IOH = 33 mA
V
6
V
V
1.1
V
6
1.5
V
V
2.5
1.5
5
V
5
V
± 0.2
V
+3
See Figure 1
–1
V
± 0.2
V
± 100
µA
VO = – 7 V to 12 V
± 100
µA
VI = 2.7 V
VI = 0.5 V
20
µA
Low-level input current
– 360
µA
Short-circuit output current
VO = – 7 V
VO = VCC
High-level input current
VO = – 7 V to 12 V
– 180
180
VO = 12 V
ICC
UNIT
– 1.5
1/2 VOD1
or 2‡
See Note 2
RL = 54 Ω or 100 Ω
Ω,
MAX
3.7
1.5
RL = 54 Ω,
VOD3
IOS
VIL = 0.8 V,
VIL = 0.8 V,
See Figure 1
Differential output voltage
TYP†
0
RL = 100 Ω
Ω,
|VOD2|
IIH
IIL
MIN
Supply current (all drivers)
No load
mA
500
Outputs enabled
38
60
Outputs disabled
18
40
mA
† All typical values are at VCC = 5 V and TA = 25°C.
‡ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2 V, whichever is greater.
§ ∆|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.
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3
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
EIA/TIA-422-B
RS-485
VO
|VOD1|
Voa, Vob
Vo
Voa, Vob
Vo
|VOD2|
Vt (RL = 100 Ω)
Vt (RL = 54 Ω)
Vt (Test Termination)
Measurement 2)
∆|VOD|
| |Vt| – |Vt| |
| |Vt| – |Vt| |
VOC
∆|VOC|
IOS
|Vos|
|Vos – Vos|
|Isa|,|Isb|
|Vos|
|Vos – Vos|
IO
|Ixa|,|Ixb|
Iia,Iib
|VOD2|
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
td(OD)
tt(OD)
Differential-output delay time
tPZH
tPZL
tPHZ
tPLZ
TEST CONDITIONS
MIN
TYP
MAX
45
65
UNIT
ns
RL = 54 Ω
Ω,
See Figure 2
80
120
ns
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
Differential-output transition time
PARAMETER MEASUREMENT INFORMATION
RL
2
VOD2
RL
2
VOC
Figure 1. Differential and Common-Mode Output Voltages
3V
Input
Generator
(see Note A)
RL =
54 Ω
50 Ω
CL = 50 pF
Output
(see Note B)
1.5 V
1.5 V
0V
td(OD)
≈ 2.5 V
td(OD)
3V
Output
50%
90%
50%
10%
tt(OD)
3 V or 0
TEST CIRCUIT
≈ 2.5 V
tt(OD)
VOLTAGE WAVEFORMS
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%,
ZO = 50 Ω.
B. CL includes probe and stray capacitance.
Figure 2. Differential-Output Test CIrcuit and Voltage Waveforms
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
3V
S1
Output
0 V to 3 V
Generator
(see Note A)
Input
1.5 V
tPZH
RL = 110 Ω
50 Ω
1.5 V
0.5 V
0V
VOH
Output
3V
(see Note C)
2.3 V
CL = 50 pF
(see Note B)
Voff ≈ 0 V
tPHZ
TEST CIRCUIT
VOLTAGE WAVEFORMS
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
5V
RL = 110 Ω
S1
1.5 V
1.5 V
Output
0 V to 3 V
Generator
(see Note A)
3V
Input
0V
tPZL
50 Ω
CL = 50 pF
(see Note B)
tPLZ
5V
2.3 V
Output
3V
(see Note C)
0.5 V
VOL
VOLTAGE WAVEFORMS
TEST CIRCUIT
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 4. Test Circuit and Voltage Waveforms
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• DALLAS, TEXAS 75265
5
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
VCC = 5 V
TA = 25°C
4
3.5
3
2.5
2
1.5
1
4
3.5
3
2.5
2
1.5
1
0.5
0.5
0
VCC = 5 V
TA = 25°C
4.5
VOL – Low-Level Output Voltage – V
VOH – High-Level Output Voltge – V
4.5
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
5
5
0
0
– 20
– 40
– 60
– 80
– 100
0
– 120
IOH – High-Level Output Current – mA
20
40
100
120
Figure 6
OUTPUT CURRENT
vs
OUTPUT VOLTAGE
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
50
4
VCC = 5 V
TA = 25°C
3.5
40
Output Dissabled
TA = 25°C
30
3
IIO
O – Output Current – A
VOD – Differential Output Voltage – V
80
IOL – Low-Level Output Current – mA
Figure 5
2.5
2
20
10
VCC = 0
0
ÁÁ
ÁÁ
ÁÁ
1.5
1
– 10
– 20
VCC = 5 V
– 30
0.5
– 40
0
0
10
20
30
40
50
60
70
80
90 100
– 50
– 25 – 20 – 15 – 10 – 5
0
Figure 7
Figure 8
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5
10
VO – Output Voltage – V
IO – Output Current – mA
6
60
• DALLAS, TEXAS 75265
15
20
25
SN75172
QUADRUPLE DIFFRENTIAL LINE DRIVER
SLLS038B – OCTOBER 1980 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
100
80
70
60
Inputs
Open
50
ÁÁ
ÁÁ
ÁÁ
ÁÁ
ÁÁ
ÁÁ
40
Inputs
Grounded
30
20
10
0
0
1
2
3
No Load
Input Open
Output Enabled
TA = 25°C
25
ICC
I CC – Supply Current – mA
90
ICC
I CC – Supply Current – mA
30
No Load
Outputs Enabled
TA = 25°C
4
5
6
7
20
15
10
5
0
8
0
1
VCC – Supply Voltage – V
Figure 9
2
3
4
5
6
VCC – Supply Voltage – V
7
8
Figure 10
APPLICATION INFORMATION
1/4 SN75172
1/4 SN75174
RT
RT
1/4 SN75173
Up to 32
RS-485 Unit Load
1/4 SN75172
1/4 SN75173
1/4 SN75175
1/4 SN75173 1/4 SN75174
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.
Figure 11
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Copyright  1998, Texas Instruments Incorporated