SN65HVD20 Datasheet, PDF (1/25 Pages) Texas Instruments – EXTENDED COMMON-MODE RS-485 TRANSCEIVERS

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SN65HVD20, SN65HVD21
SN65HVD22, SN65HVD23, SN65HVD24
SLLS552D − DECEMBER 2002 − REVISED APRIL 2005
EXTENDED COMMONĆMODE RSĆ485 TRANSCEIVERS
FEATURES
D Common-Mode Voltage Range (−20 V to 25 V)
More Than Doubles TIA/EIA-485 Requirement
D Receiver Equalization Extends Cable Length,
Signaling Rate (HVD23, HVD24)
D Reduced Unit-Load for up to 256 Nodes
D Bus I/O Protection to Over 16-kV HBM
D Failsafe Receiver for Open-Circuit,
Short-Circuit and Idle-Bus Conditions
D Low Standby Supply Current 1-µA Max
D More Than 100 mV Receiver Hysteresis
APPLICATIONS
D Long Cable Solutions
− Factory Automation
− Security Networks
− Building HVAC
D 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
10
1
0.1
10
HVD20
HVD21
HVD23
HVD24
HVD22
100
Cable Length − m
1000
HVD2x Devices Operate Over a Wider Common-Mode Voltage Range
−20 V
+25 V
SUPER−485
RS−485
−7 V
−20 V −15 V −10 V −5 V 0
+12 V
5 V 10 V 15 V 20 V 25 V
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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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
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