ꢀꢁ ꢂꢃ ꢄꢅ ꢆꢇ ꢈ ꢉ ꢀꢁꢂ ꢃꢄ ꢅꢆ ꢇꢊ
ꢀꢁꢂ ꢃ ꢄꢅ ꢆꢇ ꢇ ꢉ ꢀꢁꢂ ꢃ ꢄꢅ ꢆꢇ ꢋ ꢉ ꢀꢁꢂ ꢃꢄ ꢅꢆ ꢇꢌ
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SLLS552D − DECEMBER 2002 − REVISED APRIL 2005
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FEATURES
DESCRIPTION
D
D
Common-Mode Voltage Range (−20 V to 25 V)
More Than Doubles TIA/EIA-485 Requirement
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.
Receiver Equalization Extends Cable Length,
Signaling Rate (HVD23, HVD24)
D
D
D
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
D
Low Standby Supply Current 1-µA Max
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.
D
More Than 100 mV Receiver Hysteresis
APPLICATIONS
D
Long Cable Solutions
−
−
−
Factory Automation
Security Networks
Building HVAC
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.
D
Severe Electrical Environments
−
−
−
Electrical Power Inverters
Industrial Drives
Avionics
HVD2x APPLICATION SPACE
HVD2x Devices Operate Over a Wider Common-Mode Voltage Range
100
−20 V
+25 V
HVD23
HVD20
SUPER−485
RS−485
10
HVD24
HVD21
1
−7 V
−20 V −15 V −10 V −5 V
+12 V
15 V
HVD22
0
5 V
10 V
20 V
25 V
0.1
10
100
Cable Length − m
1000
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.
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Copyright 2002 − 2003, Texas Instruments Incorporated