SN65HVD1794 70-V Fault-Protected RS-485 Transceiver With Cable Invert | TI.com

SN65HVD1794 (ACTIVE)

70-V Fault-Protected RS-485 Transceiver With Cable Invert

 

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.

For similar features with 3.3 V supply operation, see the SN65HVD1781 (SLLS877).

Features

  • 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
    • ICC 5 mA Quiescent During Operation
  • Power-Up, Power-Down Glitch-Free Operation

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Parametrics Compare all products in RS-485/RS-422

 
Supply Voltage(s) (Nom) (V)
Number of TX
Number of RX
Duplex
Signaling Rate (Max) (Mbps)
IEC 61000-4-2 contact (+/- kV)
HBM ESD (kV)
Fault protection (V)
Number of nodes
Common mode range
ICC (Max) (mA)
Features
Isolated
Rating
Operating temperature range (C)
Package Group
Approx. price (US$)
SN65HVD1794 SN65HVD1780 SN65HVD1781 SN65HVD1782 SN65HVD1785 SN65HVD1786 SN65HVD1787 SN65HVD1791 SN65HVD1792 SN65HVD1793
5     3.3
5    
3.3
5    
3.3
5    
5     5     5     5     5     5    
1     1     1     1     1     1     1     1     1     1    
1     1     1     1     1     1     1     1     1     1    
Half     Half     Half     Half     Half     Half     Half     Full     Full     Full    
0.115     0.115     1     10     0.115     1     10     0.115     1     10    
   
   
   
   
   
   
   
   
   
   
16     16     16     16     16     16     16     16     16     16    
-70 to 70     -70 to 70     -70 to 70     -30 to 30     -70 to 70     -70 to 70     -30 to 30     -70 to 70     -70 to 70     -30 to 30    
256     320     320     64     256     256     64     256     256     256    
-20 to 25     -7 to 12     -7 to 12     -7 to 12     -20 to 25     -20 to 25     -20 to 25     -20 to 25     -20 to 25     -20 to 25    
6     6     6     6     6     6     6     6     6     6    
Fault protection     Fault protection     Fault protection       Fault protection     Fault protection     Extended common mode     Fault protection     Fault protection     Extended common mode    
No     No     No     No     No     No     No     No     No     No    
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