SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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 Enable
D
Thermal Shutdown Protection
D
Positive- and Negative-Current Limiting
D
Operates From Single 5-V Supply
D
Low Power Requirements
D
Functionally Interchangeable With MC3487
description
The SN75174 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
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.
The SN75174 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 SN75174 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each driver)
OUTPUTS
INPUT
ENABLE
Y Z
H H H L
L H L H
X L Z Z
H = TTL high level, X = irrelevant,
L = TTL low level, Z = high impedance (off)
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.
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
5
6
7
8
16
15
14
13
12
11
10
9
1A
1Y
1Z
1,2EN
2Z
2Y
2A
GND
V
CC
4A
4Y
4Z
3,4EN
3Z
3Y
3A
N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1A
1Y
NC
1Z
1,2EN
2Z
NC
2Y
2A
GND
V
CC
4A
4Y
NC
4Z
3,4EN
3Z
NC
3Y
3A
DW PACKAGE
(TOP VIEW)
NC – No internal connection
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
EN
EN
4A
3A
3,4EN
2A
1A
1,2EN
15
9
12
7
1
4
4Z
4Y
3Z
3Y
2Z
2Y
1Z
1Y
13
14
11
10
5
6
3
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram, each driver (positive logic)
A
EN
Y
Z
schematics of inputs and outputs
Enable Inputs: R
(eq)
= 8 kΩ NOM
R
(eq)
= equivalent resistor
Data Inputs: R
(eq)
= 3 kΩ NOM
Input
V
CC
R
(eq)
EQUIVALENT OF EACH INPUT
TYPICAL OF ALL OUTPUTS
GND
Output
V
CC
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range,V
O
–10 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
NOTE 1: All voltage values are with respect to the network ground terminal.
DISSIPATION RATING TABLE
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
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
2 V
Low-level input voltage, V
IL
0.8 V
Common-mode output voltage, V
OC
–7 to 12 V
High-level output current, I
OH
–60 mA
Low-level output current, I
OL
60 mA
Operating free-air temperature, T
A
0 70 °C
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
p
V
= 2 V, V
= 0.8 V ,
VOHHigh-level output voltage
IH
,
IL
,
IOH = –33 mA
3.7
V
p
V
= 2 V, V
= 0.8 V ,
VOLLow-level output voltage
IH
,
IL
,
IOL = 33 mA
1.1
V
V
O
Output voltage IO = 0 0 6 V
|V
OD1
| Differential output voltage IO = 0 1.5 6 6 V
1/2 V
OD1
|V
OD2
| Differential output voltage
R
L
=
100 Ω
,
See Figure 1
OD1
or 2
‡
V
RL = 54 Ω, See Figure 1 1.5 2.5 5 V
V
OD3
Differential output voltage See Note 2 1.5 5 V
∆|V
OD|
Change in magnitude of differential output
voltage
§
±0.2 V
+3
V
OC
C
ommon-mode output voltage
¶
R
L
= 54 Ω or
100 Ω,S
ee Figure
1
–1
V
Change in magnitude of common-mode output
∆|VOC|
Change in magnitude of common mode out ut
voltage
§
±0.2
V
I
O
Output current with power off VCC = 0, VO = – 7 V to 12 V ±100 µA
I
OZ
High-impedance-state output current VO = – 7 V to 12 V ±100 µA
I
IH
High-level input current VI = 2.7 V 20 µA
I
IL
Low-level input current VI = 0.5 V –360 µA
VO = – 7 V –180
I
OS
Short-circuit output current
VO = V
CC
180
mA
VO = 12 V 500
pp
Outputs enabled 38 60
ICCSupply current (all drivers)
No load
Outputs disabled 18 40
mA
†
All typical values are at VCC = 5 V and TA = 25°C.
‡
The minimum V
OD2
with a 100-Ω load is either 1/2 V
OD1
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 EIA Standard RS-485.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d(OD)
Differential-output delay time
45 65 ns
t
t(OD)
Differential-output transition time
R
L
= 54 Ω,
See Figure 2
80 120 ns
t
PZH
Output enable time to high level RL = 110 Ω, See Figure 3 80 120 ns
t
PZL
Output enable time to low level RL = 110 Ω, See Figure 4 55 80 ns
t
PHZ
Output disable time from high level RL = 110 Ω, See Figure 3 75 115 ns
t
PLZ
Output disable time from low level RL = 110 Ω, See Figure 3 18 30 ns
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
EIA/TIA-422-B RS-485
V
O
V
oa, Vob
V
oa, Vob
|V
OD1
| V
o
V
o
|V
OD2
| Vt (RL = 100 Ω) Vt (RL = 54 Ω)
|V
OD3
|
Vt (Test Termination)
Measurement 2)
∆|VOD| ||Vt| – |Vt|| | |Vt| – |Vt||
V
OC
|Vos| |Vos|
∆|VOC| |Vos – Vos| |Vos – Vos|
I
OS
|Isa|,|Isb|
I
O
|Ixa|,|Ixb| Iia,I
ib
PARAMETER MEASUREMENT INFORMATION
V
OC
2
R
L
2
R
L
V
OD2
Figure 1. Differential and Common-Mode Output Voltages
VOLTAGE W AVEFORMSTEST CIRCUIT
10%
50%
90%
1.5 V1.5 V
t
t(OD)
t
d(OD)
t
t(OD)
~2.5 V
0 V
3 V
t
d(OD)
Output
Input
CL = 50 pF
(see Note B)
Output
54 Ω
RL =
3 V
50 Ω
~2.5 V
Generator
(see Note A)
90%
50%
10%
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
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE W AVEFORMSTEST CIRCUIT
Output
Input
1.5 V
2.3 V
1.5 V
t
PHZ
t
PZH
0.5 V
V
off
≈ 0 V
V
OH
0 V
3 V
3 V to 0 V
50 Ω
S1
RL = 110 Ω
Output
Generator
(see Note A)
CL = 50 pF
(see Note B)
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.
Figure 3. Test Circuit and Voltage Waveforms
RL = 110 Ω
VOLTAGE W AVEFORMSTEST CIRCUIT
Output
Input
t
PZL
1.5 V
2.3 V
0.5 V
t
PLZ
1.5 V
V
OL
5 V
0 V
3 V
50 Ω
S1
Output
5 V
0 V to 3 V
Generator
(see Note A)
CL = 50 pF
(see Note B)
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.
Figure 4. Test Circuit and Voltage Waveforms
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 5
TA = 25°C
VCC = 5 V
4.5
4
3.5
3
2.5
2
1.5
1
0.5
–100–80–60–40–20
0
–120
5
IOH – High-Level Output Current – mA
– High-Level Output Voltage – V
0
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
V
OH
Figure 6
IOL – Low-Level Output Current – mA
– Low-Level Output Voltage – V
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
5
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
10080604020 1200
V
OL
TA = 25°C
VCC = 5 V
Figure 7
IO – Output Current – mA
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
3.5
3
2.5
2
1.5
1
0.5
908070605040302010
0
4
VOD – Differential Output Voltage – V
0
OD
V
VCC = 5 V
TA = 25°C
Figure 8
IO – Output Current – A
VO – Output Voltage – V
OUTPUT CURRENT
vs
OUTPUT VOLTAGE
VCC = 5 V
VCC = 0 V
40
30
20
10
0
–10
–20
–30
–40
20151050–5–10–15–20
–50
25
50
–25
I
O
Output Disabled
TA = 25°C
Aµ
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MA Y 1995
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 9
VCC – Supply Voltage – V
ICC – Supply Current – mA
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
Grounded
Inputs
90
80
70
60
50
40
30
20
10
7654321
0
8
100
0
БББББ
TA = 25°C
Outputs Enabled
No Load
CC
I
Inputs Open
Figure 10
VCC – Supply Voltage – V
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
25
20
15
10
5
765432
0
8
30
0
Outputs Disabled
TA = 25°C
Input Open
No Load
ICC – Supply Current – mA
CC
I
1
APPLICATION INFORMATION
1/4 SN75175
1/4 SN75174
RS-485 Unit Loads
Up to 32
1/4 SN751741/4 SN751731/4 SN75172 1/4 SN75173
1/4 SN75173
1/4 SN75172
R
T
R
T
NOTE: 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. Typical Application Circuit
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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