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

Parametrics

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Part number Order 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 Order now 5     1     1     Half     0.115         16     -70 to 70     256     -20 to 25     6     Fault protection     No     Catalog     -40 to 105     PDIP | 8
SOIC | 8    
1.95 | 1ku    
SN65HVD1780 Order now 3.3
5    
1     1     Half     0.115         16     -70 to 70     320     -7 to 12     6     Fault protection     No     Catalog     -40 to 105     PDIP | 8
SOIC | 8    
1.85 | 1ku    
SN65HVD1781 Order now 3.3
5    
1     1     Half     1         16     -70 to 70     320     -7 to 12     6     Fault protection     No     Catalog     -40 to 105
-40 to 125    
PDIP | 8
SOIC | 8    
1.85 | 1ku    
SN65HVD1782 Order now 3.3
5    
1     1     Half     10         16     -30 to 30     64     -7 to 12     6       No     Catalog     -40 to 105     PDIP | 8
SOIC | 8    
1.80 | 1ku    
SN65HVD1785 Order now 5     1     1     Half     0.115         16     -70 to 70     256     -20 to 25     6     Fault protection     No     Catalog     -40 to 105     PDIP | 8
SOIC | 8    
1.45 | 1ku