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4-103239-0X2 Datasheet(PDF) 8 Page - Texas Instruments

Part No. 4-103239-0X2
Description  High-Performance Linear/Interface Products
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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 8 page
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Overview
1-2
1.1
Overview
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 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. Figure 1 - 1 shows the basic
functions of the SN65HVD22.
The SN65HVD22 has controlled driver output slew rate for low radiated noise
in emission-sensitive applications and for improved signal quality with long
stubs. Up to 256 SN65HVD22 nodes can be connected at signaling rates up
to 500 kbps.
Figure 1 - 1. Functional Configurations of the SN65HVD22
B
A
R
RE
DE
D
0 V
Received Data
B
A
R
RE
DE
D
5 V
Transmit Data
B
A
R
RE
DE
D
5 V
Transmit
Data
0 V
Received
Data
(a) Differential Receiver
(b) Differential Driver
(b) Differential Transceiver
Figure 1 - 2 is a picture of the SN65HVD22 EVM. The EVM part number is
SN65HVD22EVM and comes with the SN65HVD22D (U2) installed. A copy
of the data sheet is shipped with the EVM—however, the latest version of the
data sheet is available from www.ti.com.




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