TI SN75174N

SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MAY 1995
D
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 Enable
Thermal Shutdown Protection
Positive- and Negative-Current Limiting
Operates From Single 5-V Supply
Low Power Requirements
Functionally Interchangeable With MC3487
1A
1Y
1Z
1, 2EN
2Z
2Y
2A
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
4A
4Y
4Z
3, 4EN
3Z
3Y
3A
DW PACKAGE
(TOP VIEW)
1A
1Y
NC
1Z
1, 2EN
2Z
NC
2Y
2A
GND
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.
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
3, 4EN
3Z
NC
3Y
3A
NC – No internal connection
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
H
H
L
X
OUTPUTS
Y
Z
H
L
H
L
H
L
Z
Z
H = TTL high level, X = irrelevant,
L = TTL low level, 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MAY 1995
logic symbol†
1, 2EN
4
logic diagram, each driver (positive logic)
EN
Y
A
1A
2A
2
1
3
6
7
5
Z
1Y
1Z
EN
2Y
2Z
3, 4EN
3A
4A
12
EN
10
9
11
14
15
13
3Y
3Z
4Y
4Z
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
TYPICAL OF ALL OUTPUTS
VCC
VCC
R(eq)
Input
Output
GND
Data Inputs: R(eq) = 3 kΩ NOM
Enable Inputs: R(eq) = 8 kΩ NOM
R(eq) = equivalent resistor
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MAY 1995
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Output voltage range,VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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
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
Supply voltage, VCC
High-level input voltage, VIH
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
2
Low-level input voltage, VIL
Common-mode output voltage, VOC
High-level output current, IOH
Low-level output current, IOL
Operating free-air temperature, TA
0
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
V
0.8
V
– 7 to 12
V
– 60
mA
60
mA
70
°C
3
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MAY 1995
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
UNIT
– 1.5
V
VIK
Input clamp voltage
II = – 18 mA
VOH
High level output voltage
High-level
VIH = 2 V,,
IOH = – 33 mA
VIL= 0.8 V,,
37
3.7
V
VOL
Low level output voltage
Low-level
VIH = 2 V,,
IOL = 33 mA
VIL= 0.8 V,,
11
1.1
V
VO
|VOD1|
Output voltage
|VOD2|
Differential output voltage
VOD3
Differential output voltage
∆|VOD|
Change in magnitude of differential output
voltage§
VOC
Common mode output voltage¶
Common-mode
∆|VOC|
Change in magnitude of common
common-mode
mode out
output
ut
voltage§
IO
IOZ
Output current with power off
IIH
IIL
High-level input current
IOS
IO = 0
IO = 0
Differential output voltage
0
1.5
RL = 100 Ω,
Ω
See Figure 1
1/2 VOD1
or 2‡
RL = 54 Ω,
See Figure 1
1.5
See Note 2
2.5
See Figure 1
VCC = 0,
VO = – 7 V to 12 V
VO = – 7 V to 12 V
Low-level input current
VI = 2.7 V
VI = 0.5 V
Short-circuit output current
VO = – 7 V
VO = VCC
Supply current (all drivers)
V
V
5
V
5
V
± 0.2
V
+3
–1
V
± 0.2
02
V
± 100
µA
± 100
µA
20
µA
– 360
µA
– 180
180
VO = 12 V
ICC
6
6
V
1.5
RL = 54 Ω or 100 Ω
Ω,
High-impedance-state output current
6
mA
500
No load
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 EIA Standard RS-485.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
td(OD)
tt(OD)
Differential-output delay time
tPZH
tPZL
tPHZ
tPLZ
4
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
55
80
ns
Output disable time from high level
RL = 110 Ω,
See Figure 3
75
115
ns
Output disable time from low level
RL = 110 Ω,
See Figure 3
18
30
ns
Differential-output transition time
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – 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
|VOD3|
PARAMETER MEASUREMENT INFORMATION
RL
2
VOD2
RL
2
VOC
Figure 1. Differential and Common-Mode Output Voltages
3V
1.5 V
Input
Generator
(see Note A)
RL =
54 Ω
50 Ω
CL = 50 pF Output
(see Note B)
0V
td(OD)
td(OD)
Output
3V
1.5 V
90%
50%
10%
90%
50%
10%
tt(OD)
TEST CIRCUIT
~ 2.5 V
~ 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
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
3V
Input
S1
3 V to 0 V
Generator
(see Note A)
50 Ω
1.5 V
1.5 V
Output
0V
tPZH
RL = 110 Ω
CL = 50 pF
(see Note B)
0.5 V
VOH
Output
2.3 V
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.
Figure 3. Test Circuit and Voltage Waveforms
5V
S1
0 V to 3 V
Generator
(see Note A)
50 Ω
3V
RL = 110 Ω
Output
CL = 50 pF
(see Note B)
Input
1.5 V
1.5 V
0V
tPLZ
tPZL
5V
2.3 V
Output
0.5 V
VOL
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.
Figure 4. Test Circuit and Voltage Waveforms
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – 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
5
5
VCC = 5 V
TA = 25°C
4
3.5
3
2.5
2
ÁÁ
ÁÁ
ÁÁ
4
3.5
3
2.5
2
ÁÁ
ÁÁ
ÁÁ
1.5
1
0.5
0
0
– 20
– 40
– 60
– 80
– 100
VCC = 5 V
TA = 25°C
4.5
VOL – Low-Level Output Voltage – V
VOH – High-Level Output Voltage – V
4.5
1.5
1
0.5
0
0
– 120
20
40
Figure 5
80
100
120
Figure 6
DIFFERENTIAL OUTPUT VOLTAGE
vs
OUTPUT CURRENT
OUTPUT CURRENT
vs
OUTPUT VOLTAGE
ÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁ ÁÁ ÁÁÁÁÁÁ
ÁÁÁÁÁ ÁÁ ÁÁÁÁÁÁ
4
50
VCC = 5 V
TA = 25°C
3.5
40
Output Disabled
TA = 25°C
30
µA
IIO
O – Output Current – A
VOD – Differential Output Voltage – V
V
OD
60
IOL – Low-Level Output Current – mA
IOH – High-Level Output Current – mA
3
2.5
2
10
VCC = 0 V
0
ÁÁ
ÁÁ
ÁÁ
1.5
ÁÁ
ÁÁ
ÁÁ
20
1
– 10
VCC = 5 V
– 20
– 30
0.5
– 40
0
0
10
20
30
40
50
60
70
80
90
– 50
– 25 – 20 – 15 – 10 – 5
IO – Output Current – mA
0
5
10
15
20
25
VO – Output Voltage – V
Figure 7
Figure 8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
SN75174
QUADRUPLE DIFFERENTIAL LINE DRIVER
SLLS039B – OCTOBER 1980 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
ÁÁÁÁÁ
ÁÁÁÁÁ
100
80
No Load
Input Open
Outputs Disabled
TA = 25°C
25
IICC
CC – Supply Current – mA
IICC
CC – Supply Current – mA
90
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
30
No Load
Outputs Enabled
TA = 25°C
70
60
Inputs Open
50
ÁÁÁ
ÁÁÁ
ÁÁÁ
15
ÁÁ
ÁÁ
ÁÁ
40
Inputs
Grounded
30
20
20
10
10
5
0
0
0
1
2
3
4
5
6
7
0
8
1
VCC – Supply Voltage – V
2
3
4
5
6
VCC – Supply Voltage – V
Figure 9
7
8
Figure 10
APPLICATION INFORMATION
1/4 SN75172
1/4 SN75174
RT
RT
1/4 SN75173
Up to 32
RS-485 Unit Loads
1/4 SN75172
1/4 SN75173
1/4 SN75173
1/4 SN75175
1/4 SN75174
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
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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