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SN75176A
SLLS100B – JUNE 1984 – REVISED JANUARY 2015
SN75176A Differential Bus Transceiver
1 Features
•
•
1
•
•
•
•
•
•
•
•
•
•
•
•
Bidirectional Transceiver
Meets or Exceeds the Requirements of ANSI
Standards EIA/TIA-422-B and ITU
Recommendations V.11
Designed for Multipoint Transmission on Long Bus
Lines in Noisy Environments
3-State Driver and Receiver Outputs
Individual Driver and Receiver Enables
Wide Positive and Negative Input/Output Bus
Voltage Ranges
Driver Output Capability ±60 mA Max
Thermal-Shutdown Protection
Driver Positive-Current Limiting and NegativeCurrent Limiting
Receiver Input Impedance 12 kΩ Min
Receiver Input Sensitivity ±200 mV
Receiver Input Hysteresis 50 mV Typ
Operates From Single 5-V Supply
Lower Power Requirements
2 Applications
•
•
Low Speed RS485 communication (5 Mbps or
less)
For 10 Mbps, use SN75176B
The SN75176A combines a 3-state differential line
driver and a differential input line receiver, both of
which operate from a single 5-V power supply. The
driver and receiver have active-high and active-low
enables, respectively, that can be externally
connected together to function as a direction control.
The driver differential outputs and the receiver
differential inputs are connected internally to form
differential input/output (I/O) bus ports that are
designed to offer minimum loading to the bus
whenever the driver is disabled or VCC = 0. These
ports feature wide positive and negative commonmode voltage ranges making the device suitable for
party-line applications.
The driver is designed to handle loads up to 60 mA of
sink or source current. The driver features positiveand negative-current limiting and thermal shutdown
for protection from line fault conditions. Thermal
shutdown is designed to occur at a junction
temperature of approximately 150°C. The receiver
features a minimum input impedance of 12 kΩ, an
input sensitivity of ±200 mV, and a typical input
hysteresis of 50 mV.
The SN75176A can be used in transmission-line
applications employing the SN75172 and SN75174
quadruple differential line drivers and SN75173 and
SN75175 quadruple differential line receivers.
The SN75176A is characterized for operation from
0°C to 70°C.
Device Information(1)
3 Description
The SN75176A differential bus transceiver is a
monolithic integrated circuit designed for bidirectional
data communication on multipoint bus-transmission
lines. It is designed for balanced transmission lines
and meets ANSI Standard EIA/TIA-422-B and ITU
Recommendation V.11.
PART NUMBER
SN75176A
PACKAGE (PIN)
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
PDIP (8)
9.81 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematics
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
SN75176A
SLLS100B – JUNE 1984 – REVISED JANUARY 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
4
4
4
4
5
5
6
6
6
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics – Driver .............................
Electrical Characteristics – Receiver ........................
Switching Characteristics – Driver ............................
Switching Characteristics – Receiver........................
Typical Characteristics ..............................................
Parameter Measurement Information .................. 8
Detailed Description ............................................ 11
8.1
8.2
8.3
8.4
9
Overview .................................................................
Functional Block Diagrams .....................................
Feature Description.................................................
Device Functional Modes........................................
11
11
12
12
Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Application .................................................. 13
10 Power Supply Recommendations ..................... 14
11 Layout................................................................... 15
11.1 Layout Guidelines ................................................. 15
11.2 Layout Example .................................................... 15
12 Device and Documentation Support ................. 15
12.1 Trademarks ........................................................... 15
12.2 Electrostatic Discharge Caution ............................ 15
12.3 Glossary ................................................................ 15
13 Mechanical, Packaging, and Orderable
Information ........................................................... 15
4 Revision History
Changes from Revision May (1995) to Revision B
Page
•
Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
•
Deleted Ordering Information table. ....................................................................................................................................... 1
2
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5 Pin Configuration and Functions
Pin Functions
PIN
NAME
NO.
TYPE
DESCRIPTION
R
1
O
Logic Data Output from RS-485 Receiver
RE
2
I
Receive Enable (active low)
DE
3
I
Driver Enable (active high)
D
4
I
Logic Data Input to RS-485 Driver
GND
5
—
Device Ground Pin
A
6
I/O
RS-422 or RS-485 Data Line
B
7
I/O
RS-422 or RS-485 Data Line
VCC
8
—
Power Input. Connect to 5-V Power Source.
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
Voltage range at any bus terminal
VI
–10
Enable input voltage
Continuous Total power Dissipation
Operating free-air temperature range
Tstg
Storage temperature range
(2)
UNIT
7
V
15
V
5.5
V
See Table 1
TA
(1)
MAX
Supply Voltage (2)
VCC
0
70
°C
65
150
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltage values, except differential input/output bus voltage, are with respect to network ground terminal.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±XXX
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±YYY
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
VCC
Supply Voltage
VI or VIC
Voltage at any buss terminal (separately or common mode)
VIH
High-level input voltage
D, DE, and RE
VIL
Low-level input voltage
D, DE, and RE
VID
Differential input voltage (1)
IOH
High-level output current
IOL
Low-level output current
TA
Operating free-air temperature
(1)
MIN
TYP
MAX
UNIT
4.75
5
5.25
V
12
V
–7
2
V
Driver
Receiver
0.8
V
±12
V
–60
mA
–400
µA
Driver
60
Receiver
8
0
70
mA
°C
Differential-input/output bus voltage is measured at the non-inverting terminal A with respect to the inverting terminal B.
6.4 Thermal Information
SN75176A
THERMAL METRIC (1)
RθJA
(1)
Junction-to-ambient thermal resistance
D
P
8 PINS
8 PINS
172
113
UNIT
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
Table 1. Dissipation Rating Table
PACKAGE
4
TA ≤ 25°C
DERATING FACTOR
TA = 70°C
POWER RATING
ABOVE TA = 25°C
POWER RATING
D
725 mW
5.8 mW/°C
464 mW
P
1100 mW
8.8 mW/°C
704 mW
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6.5 Electrical Characteristics – Driver
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP (1)
MAX
UNIT
–1.5
V
VIK
Input clamp voltage
II = –18 mA
VOH
High-level output voltage
VIH = 2 V, VIL = 0.8 V, IOH = –33 mA
3.7
VOL
Low-level output voltage
VIH = 2 V, VIL = 0.8 V, IOH = 33 mA
1.1
|VOD1|
Differential output voltage
IO = 0
|VOD2|
Differential output voltage
Δ|VOD|
Change in magnitude of differential output
voltage (2)
VOC
Common-mode output voltage (3)
Δ|VOC|
Change in magnitude of common-mode
output voltage (2)
IO
Output current
Output disabled (4)
IIH
High-level input current
VI = 2.4 V
20
µA
IIL
Low-level input current
VI = 0.4 V
–400
µA
VO = –7 V
–250
VO = VCC
250
IOS
Short-circuit output current
(1)
(2)
(3)
(4)
Supply current (total package)
V
2VOD2
RL = 100 Ω, see Figure 8
RL = 54 Ω, see Figure 8
2
2.7
1.5
2.4
V
V
±0.2
V
3
V
±0.2
V
RL = 54 Ω or 100 Ω, see Figure 8
VO = 12 V
1
VO = –7 V
–0.8
VO = 12 V
ICC
V
mA
mA
500
No load
Outputs enabled
35
50
Outputs disabled
26
40
mA
All typical values are at VCC = 5 V and TA = 25°C.
Δ|VOD| and D|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 GND, is called output offset
voltage, VOS.
This applies for both power on and off; refer to ANSI Standard EIA/TIA-422-B for exact conditions.
6.6 Electrical Characteristics – Receiver
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP (1)
MAX
Positive-going input threshold voltage
VO = 2.7 V, IO = –0.4 mA
VIT–
Negative-going input threshold voltage
VO = 0.5 V, IO = 8 mA
Vhys
Input hysteresis voltage (VIT+ – VIT-)
VIK
Enable clamp voltage
II = –18 mA
VOH
High-level output voltage
VID = 200 mV, IOH = –400 µA See Figure 9
VOL
Low-level output voltage
VID = 200 mV, IOH = 8 mA See Figure 9
IOZ
High-impedance-state output current
VO = 0.4 V to 2.4 V
II
Line input current
Other input = 0 V (2)
IIH
High-level enable input current
VIH = 2.7 V
20
µA
IIL
Low-level enable input current
VIL = 0.4 V
–100
µA
ri
Input resistance
IOS
Short-circuit output current
–85
mA
ICC
Supply current (total package)
(1)
(2)
0.2
UNIT
VIT+
–0.2
V
50
mV
–1.5
2.7
V
V
0.45
V
±20
VI = 12 V
1
VI = –7 V
–0.8
12
µA
mA
kΩ
–15
No load
V
Outputs enabled
35
50
Outputs disabled
26
40
mA
All typical values are at VCC = 5 V, TA = 25°C.
This applies for both power on and power off. Refer to ANSI Standard EIA/TIA-422-B for exact conditions.
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6.7 Switching Characteristics – Driver
VCC = 5 V, TA = 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
40
60
ns
65
95
ns
td(OD)
Differential-output delay time
tt(OD)
Differential-output transition time
tPZH
Output enable time to high level
RL = 110 Ω, See Figure 11
55
90
ns
tPZL
Output enable time to low level
RL = 110 Ω, See Figure 12
30
50
ns
tPHZ
Output disable time form high level
RL = 110 Ω, See Figure 11
85
130
ns
tPLZ
Output disable time from low level
RL = 110 Ω, See Figure 12
20
40
ns
TYP
MAX
21
35
ns
23
35
ns
10
30
ns
12
30
ns
20
35
ns
17
25
ns
RL = 60 Ω, See Figure 10
6.8 Switching Characteristics – Receiver
VCC = 5 V, CL = 15 pF, TA = 25°C
PARAMETER
tPLH
Propagation delay time, low-to-highlevel output
tPHL
Propagation delay time, high-to-lowlevel output
tPZH
Output enable time to high level
tPZL
Output enable time to low level
tPHZ
Output disable time from high level
tPLZ
Output disable time from low level
TEST CONDITIONS
MIN
UNIT
VID = –1.5 V to 1.5 V, See Figure 13
See Figure 14
See Figure 14
6.9 Typical Characteristics
Conditions listed in each chart
Figure 1. Driver, High-level Output Voltage
vs
High-Level Output Current
6
Figure 2. Driver, Low-Level Output Voltage
vs
Low-Level Output Current
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Typical Characteristics (continued)
Conditions listed in each chart
Figure 3. Driver, Differential Output Voltage
vs
Output Current
Figure 4. Receiver, Low-Level Output Voltage
vs
Low-Level Output Current
Figure 5. Receiver, Low-Level Output Voltage
vs
Low-Level Output Current
Figure 6. Low-Level Output Voltage
vs
Free-Air Temperature
Figure 7. Output Voltage vs Enable Voltage
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7 Parameter Measurement Information
Figure 8. Driver VOD and VOC
Figure 9. Receiver VOH and VOL
A.
The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr ≤ 6
ns, tf ≤ 6 ns, ZO = 50 W.
B.
CL includes probe and jig capacitance.
Figure 10. Driver Test Circuit and Voltage Waveforms
A.
The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr ≤ 6
ns, tf ≤ 6 ns, ZO = 50 W.
B.
CL includes probe and jig capacitance.
Figure 11. Driver Test Circuit and Voltage Waveforms
8
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A.
The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr ≤ 6
ns, tf ≤ 6 ns, ZO = 50 W.
B.
CL includes probe and jig capacitance.
Figure 12. Driver Test Circuit and Voltage Waveforms
A.
The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr ≤ 6
ns, tf ≤ 6 ns, ZO = 50 W.
B.
CL includes probe and jig capacitance.
Figure 13. Receiver Test Circuit and Voltage Waveforms
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A.
The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr ≤ 6
ns, tf ≤ 6 ns, ZO = 50 W.
B.
CL includes probe and jig capacitance.
Figure 14. Receiver Test Circuit and voltage Waveforms
10
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8 Detailed Description
8.1 Overview
The SN75176A differential bus transceiver is a monolithic integrated circuit designed for bidirectional data
communication on multipoint bus-transmission lines. It is designed for balanced transmission lines and meets
ANSI Standard EIA/TIA-422-B and ITU Recommendation V.11.
The SN75176A combines a 3-state differential line driver and a differential input line receiver, both of which
operate from a single 5-V power supply. The driver and receiver have active-high and active-low enables,
respectively, that can be externally connected together to function as a direction control. The driver differential
outputs and the receiver differential inputs are connected internally to form differential input/output (I/O) bus ports
that are designed to offer minimum loading to the bus whenever the driver is disabled or VCC = 0. These ports
feature wide positive and negative common-mode voltage ranges making the device suitable for party-line
applications.
The driver is designed to handle loads up to 60 mA of sink or source current. The driver features positive- and
negative-current limiting and thermal shutdown for protection from line fault conditions. Thermal shutdown is
designed to occur at a junction temperature of approximately 150°C. The receiver features a minimum input
impedance of 12 kΩ, an input sensitivity of ±200 mV, and a typical input hysteresis of 50 mV.
8.2 Functional Block Diagrams
This symbol is in accordance with ANSI/IEEE Std 91-1984and IEC Publication 617-12
Figure 15. Schematics of Inputs and Outputs
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8.3 Feature Description
8.3.1 Driver
The driver converts a TTL logic signal level to RS-422 and RS-485 compliant differential output. The TTL logic
input, DE pin, can be used to turn the driver on and off.
Table 2. Driver Function Table (1)
(1)
INPUT
D
ENABLE
DE
DIFFERENTIAL OUTPUTS
H
H
H
L
L
H
L
H
X
L
Z
Z
A
B
H = high level, L = low level,
X = irrelevant, Z = high impedance (off)
8.3.2 Receiver
The receiver converts a RS-422 or RS-485 differential input voltage to a TTL logic level output. The TTL logic
input, RE pin, can be used to turn the receiver logic output on and off.
Table 3. Receiver Function Table (1)
(1)
DIFFERENTIAL INPUTS
A–B
ENABLE
RE
OUTPUT
R
VID ≥ 0.2 V
L
H
–0.2 V < VID < 0.2 V
L
U
VID ≤ –0.2 V
L
L
X
H
Z
Open
L
U
H = high level,
L = low level,
U = unkown,
Z = high impedance (off)
8.4 Device Functional Modes
8.4.1 Device Powered
Both the driver and receiver can be individually enabled or disabled in any combination. DE and RE can be
connected together for a single port direction control bit.
8.4.2 Device Unpowered
The driver differential outputs and the receiver differential inputs are connected internally to form differential
input/output (I/O) bus ports that are designed to offer minimum loading to the bus when the driver is disabled or
VCC = 0.
12
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The device can be used in RS-485 and RS-422 physical layer communications.
9.2 Typical Application
The line 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 16. Typical Application Circuit
9.2.1 Design Requirements
• 5-V power source
• RS-485 bus operating at 5 Mbps or less
• Connector that ensures the correct polarity for port pins
• External fail safe implementation
9.2.2 Detailed Design Procedure
• Place the device close to bus connector to keep traces (stub) short to prevent adding reflections to the bus
line
• If desired, add external fail-safe biasing to ensure +200 mV on the A-B port.
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Typical Application (continued)
9.2.3 Application Curves
A.
Scale is 1V per division and 50nS per division
Figure 17. Eye Diagram for 5-Mbps Over 100 feet of Standard CAT-5E cable
120-Ω Termination at Both Ends.
10 Power Supply Recommendations
Power supply should be 5 V with a tolerance less than 10%
14
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11 Layout
11.1 Layout Guidelines
Traces from device pins A and B to connector must be short and capable of 250 mA maximum current.
11.2 Layout Example
GND
TTL Logic
1 R
TTL Logic
2 RE
0.1 μF
VCC 8
5V
B
B 7
Connector
TTL Logic
3 DE
TTL Logic
4 D
A 6
GND 5
A
GND
Figure 18. Layout Example
12 Device and Documentation Support
12.1 Trademarks
All trademarks are the property of their respective owners.
12.2 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.3 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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14-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN75176AD
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75176A
SN75176ADE4
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75176A
SN75176ADG4
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75176A
SN75176ADR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75176A
SN75176ADRE4
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75176A
SN75176ADRG4
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
75176A
SN75176AP
ACTIVE
PDIP
P
8
50
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN75176AP
SN75176APE4
ACTIVE
PDIP
P
8
50
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN75176AP
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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