SN65HVD1794 Datasheet, PDF (1/15 Pages) Texas Instruments – 70-V Fault-Protected RS-485 Transceiver With Cable Invert

SN65HVD1794, SN65HVD1795
SN65HVD1796
www.ti.com ................................................................................................................................................................................................. SLLS935 – AUGUST 2008
70-V Fault-Protected RS-485 Transceiver With Cable Invert
FEATURES
1
• Bus-Pin Fault Protection to > ±70 V
• Cable Invert Function Allows Correction for
Reversed Bus Pins
• Common-Mode Voltage Range (–20 V to 25 V)
More Than Doubles TIA/EIA 485 Requirement
• Bus I/O Protection
– ±16 kV JEDEC HBM Protection
• Reduced Unit Load for Up to 256 Nodes
• Failsafe Receiver for Open-Circuit,
Short-Circuit and Idle-Bus Conditions
• Low Power Consumption
– I_CC 5 mA Quiescent During Operation
• Power-Up, Power-Down Glitch-Free Operation
APPLICATIONS
• Designed for RS-485 and RS-422 Networks
DESCRIPTION
These devices are designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring
faults, connector failures, cable crushes, and tool mis-applications. They are also robust to ESD events, with high
levels of protection to human-body model specifications.
These devices combine a differential driver and a differential receiver, which operate from a single power supply.
The driver differential outputs and the receiver differential inputs are connected internally to for a bus port
suitable for half-duplex (two-wire bus) communication. A cable invert pin (INV) allows active correction of
mis-wires that may occur during installation. Upon detecting communication errors, the user can apply a logic
HIGH to the INV pin, effectively inverting the polarity of the differential bus port, thereby correcting for the
reversed bus wires.
These devices feature a wide common-mode voltage range, making them suitable for multi-point applications
over long cable runs. These devices are characterized from –40°C to 105°C.
INV Input Can Correct
for Crossed Wires
V_FAULT up to 70 V
PART NUMBER
SN65HVD1794
SN65HVD1795 PREVIEW
SN65HVD1796 PREVIEW
PRODUCT SELECTION GUIDE
DUPLEX
Half
Half
Half
SIGNALING RATE
115 kbps
1 Mbps
10 Mbps
NODES
Up to 256
Up to 256
Up to 64
For similar features with 3.3 V supply operation, see the SN65HVD1781 (SLLS877).
CABLE LENGTH
1500 m
150 m
50 m
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information 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.
Copyright © 2008, Texas Instruments Incorporated