SN65HVD20_101 Datasheet, PDF (1/30 Pages) Texas Instruments – Extended Common-Mode RS-485 Transceivers

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SN65HVD20, SN65HVD21
SN65HVD22, SN65HVD23, SN65HVD24
SLLS552E – DECEMBER 2002 – REVISED MAY 2010
Extended Common-Mode RS-485 Transceivers
Check for Samples: SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24
FEATURES
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• Common-Mode Voltage Range (–20 V to 25 V)
More Than Doubles TIA/EIA-485 Requirement
• Receiver Equalization Extends Cable Length,
Signaling Rate (HVD23, HVD24)
• Reduced Unit-Load for up to 256 Nodes
• Bus I/O Protection to Over 16-kV HBM
• Failsafe Receiver for Open-Circuit,
Short-Circuit and Idle-Bus Conditions
• Low Standby Supply Current 1-µA Max
• More Than 100 mV Receiver Hysteresis
APPLICATIONS
• Long Cable Solutions
– Factory Automation
– Security Networks
– Building HVAC
• Severe Electrical Environments
– Electrical Power Inverters
– Industrial Drives
– Avionics
DESCRIPTION
The transceivers in the HVD2x family offer
performance far exceeding typical RS−485 devices.
In addition to meeting all requirements of the
TIA/EIA−485−A standard, the HVD2x family operates
over an extended range of common-mode voltage,
and has features such as high ESD protection, wide
receiver hysteresis, and failsafe operation. This family
of devices is ideally suited for long-cable networks,
and other applications where the environment is too
harsh for ordinary transceivers.
These devices are designed for bidirectional data
transmission on multipoint twisted-pair cables.
Example applications are digital motor controllers,
remote sensors and terminals, industrial process
control, security stations, and environmental control
systems.
These devices combine a 3-state differential driver
and a differential receiver, which operate from a
single 5-V power supply. The driver differential
outputs and the receiver differential inputs are
connected internally to form a differential bus port
that offers minimum loading to the bus. This port
features an extended common-mode voltage range
making the device suitable for multipoint applications
over long cable runs.
HVD2x APPLICATION SPACE
100
HVD20
10
HVD23
HVD24
HVD21
HVD2x Devices Operate Over a Wider
Common-Mode Voltage Range
-20 V
+25 V
SUPER485
1
0.1
10
HVD22
100
Cable Length - m
1000
RS485
-7 V
+12 V
-20 V -15 V -10 V -5 V 0 5 V 10 V 15 V 20 V 25 V
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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