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. In the ’HVD1785, ’HVD1786, and ’HVD1787, the driver differential outputs and the receiver differential inputs are connected internally to form a bus port suitable for half-duplex (two-wire bus) communication. In the 'HVD1793, the driver differential outputs and the receiver differential inputs are separate pins, to form a bus port suitable for full-duplex (four-wire bus) communication. These ports feature a wide common-mode voltage range, making the devices suitable for multipoint 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).
Feature
- Bus-Pin Fault Protection to:
- > ±70 V (’HVD1785, 86, 91, 92)
- > ±30 V (’HVD1787, 93)
- 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
- Low Standby Supply Current, 1 μA Typical
- ICC 5 mA Quiescent During Operation
- Power-Up, Power-Down Glitch-Free Operation
- APPLICATIONS
- Designed for RS-485 and RS-422 Networks
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