SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B OCTOBER 1980 REVISED MAY 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)
INPUT
ENABLE
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 MAY 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 k
NOM
R(eq) = equivalent resistor
Data Inputs: R(eq) = 3 k
NOM
Input
VCC
R(eq)
EQUIVALENT OF EACH INPUT
TYPICAL OF ALL OUTPUTS
GND
Output
VCC
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B OCTOBER 1980 REVISED MAY 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, VCC
4.75
5
5.25
V
High-level input voltage, VIH
2
V
Low-level input voltage, VIL
0.8
V
Common-mode output voltage, VOC
7 to 12
V
High-level output current, IOH
60
mA
Low-level output current, IOL
60
mA
Operating free-air temperature, TA
0
70
C
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B OCTOBER 1980 REVISED MAY 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
VIK
Input clamp voltage
II = 18 mA
1.5
V
VOH
High level output voltage
VIH = 2 V,
VIL= 0.8 V,
3 7
V
VOH
High-level output voltage
IH
,
IL
,
IOH = 33 mA
3.7
V
VOL
Low level output voltage
VIH = 2 V,
VIL= 0.8 V,
1 1
V
VOL
Low-level output voltage
IH
,
IL
,
IOL = 33 mA
1.1
V
VO
Output voltage
IO = 0
0
6
V
|VOD1|
Differential output voltage
IO = 0
1.5
6
6
V
RL = 100
See Figure 1
1/2
VOD1
V
|VOD2|
Differential output voltage
RL = 100
,
See Figure 1
OD1
or 2
V
RL = 54
,
See Figure 1
1.5
2.5
5
V
VOD3
Differential output voltage
See Note 2
1.5
5
V
|VOD|
Change in magnitude of differential output
voltage
0.2
V
VOC
Common mode output voltage
R
54
or 100
See Figure 1
+ 3
V
VOC
Common-mode output voltage
RL = 54
or 100
,
See Figure 1
1
V
|VOC|
Change in magnitude of common-mode output
0 2
V
|VOC|
Change in magnitude of common mode out ut
voltage
0.2
V
IO
Output current with power off
VCC = 0,
VO = 7 V to 12 V
100
A
IOZ
High-impedance-state output current
VO = 7 V to 12 V
100
A
IIH
High-level input current
VI = 2.7 V
20
A
IIL
Low-level input current
VI = 0.5 V
360
A
VO = 7 V
180
IOS
Short-circuit output current
VO = VCC
180
mA
VO = 12 V
500
ICC
Supply current (all drivers)
No load
Outputs enabled
38
60
mA
ICC
Supply current (all drivers)
No load
Outputs disabled
18
40
mA
All typical values are at VCC = 5 V and TA = 25
C.
The minimum VOD2 with a 100-
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 EIA Standard RS-485.
switching characteristics, V
CC
= 5 V, T
A
= 25
C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
td(OD)
Differential-output delay time
RL = 54
See Figure 2
45
65
ns
tt(OD)
Differential-output transition time
RL = 54
,
See Figure 2
80
120
ns
tPZH
Output enable time to high level
RL = 110
,
See Figure 3
80
120
ns
tPZL
Output enable time to low level
RL = 110
,
See Figure 4
55
80
ns
tPHZ
Output disable time from high level
RL = 110
,
See Figure 3
75
115
ns
tPLZ
Output disable time from low level
RL = 110
,
See Figure 3
18
30
ns
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B OCTOBER 1980 REVISED MAY 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
SYMBOL EQUIVALENTS
DATA SHEET PARAMETER
EIA/TIA-422-B
RS-485
VO
Voa, Vob
Voa, Vob
|VOD1|
Vo
Vo
|VOD2|
Vt (RL = 100
)
Vt (RL = 54
)
|VOD3|
Vt (Test Termination)
Measurement 2)
|VOD|
| |Vt| |Vt| |
| |Vt| |Vt| |
VOC
|Vos|
|Vos|
|VOC|
|Vos Vos|
|Vos Vos|
IOS
|Isa|,|Isb|
IO
|Ixa|,|Ixb|
Iia,Iib
PARAMETER MEASUREMENT INFORMATION
VOC
2
RL
2
RL
VOD2
Figure 1. Differential and Common-Mode Output Voltages
VOLTAGE WAVEFORMS
TEST CIRCUIT
10%
50%
90%
1.5 V
1.5 V
tt(OD)
td(OD)
tt(OD)
~
2.5 V
0 V
3 V
td(OD)
Output
Input
CL = 50 pF
(see Note B)
Output
54
RL =
3 V
50
~
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
.
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 MAY 1995
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
TEST CIRCUIT
Output
Input
1.5 V
2.3 V
1.5 V
tPHZ
tPZH
0.5 V
Voff
0 V
VOH
0 V
3 V
3 V to 0 V
50
S1
RL = 110
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
.
B. CL includes probe and stray capacitance.
Figure 3. Test Circuit and Voltage Waveforms
RL = 110
VOLTAGE WAVEFORMS
TEST CIRCUIT
Output
Input
tPZL
1.5 V
2.3 V
0.5 V
tPLZ
1.5 V
VOL
5 V
0 V
3 V
50
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
.
B. CL includes probe and stray capacitance.
Figure 4. Test Circuit and Voltage Waveforms
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B OCTOBER 1980 REVISED MAY 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 V
oltage V
0
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
V
OH
Figure 6
IOL Low-Level Output Current mA
Low-Level Output V
oltage 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
100
80
60
40
20
120
0
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
90
80
70
60
50
40
30
20
10
0
4
VOD Differential Output V
oltage 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
20
15
10
5
0
5
10
15
20
50
25
50
25
I O
Output Disabled
TA = 25
C
A
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B OCTOBER 1980 REVISED MAY 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
7
6
5
4
3
2
1
0
8
100
0
TA = 25
C
Outputs Enabled
No Load
CCI
Inputs Open
Figure 10
VCC Supply Voltage V
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
25
20
15
10
5
7
6
5
4
3
2
0
8
30
0
Outputs Disabled
TA = 25
C
Input Open
No Load
ICC Supply Current mA
CCI
1
APPLICATION INFORMATION
1/4 SN75175
1/4 SN75174
RS-485 Unit Loads
Up to 32
1/4 SN75174
1/4 SN75173
1/4 SN75172
1/4 SN75173
1/4 SN75173
1/4 SN75172
RT
RT
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
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
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.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL
APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER'S RISK.
In order to minimize risks associated with the customer's applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI's publication of information regarding any third
party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright
1998, Texas Instruments Incorporated
PDF 
ZIP