The SNx5HVD1176 devices are half-duplex differential transceivers with characteristics
optimized for use in PROFIBUS (EN 50170) applications. The driver output differential voltage
exceeds the PROFIBUS requirements of 2.1 V with a 54-Ω load. A signaling rate of up to 40 Mbps
allows technology growth to high data-transfer speeds. The low bus capacitance provides low signal
The SN65HVD1176 and SN75HVD1176 devices meet or exceed the requirements of ANSI standard
TIA/EIA-485-A (RS-485) for differential data transmission across twisted-pair networks. The driver
outputs and receiver inputs are tied together to form a half-duplex bus port with one-fifth unit
load, which allows up to 160 nodes on a single bus. The receiver output stays at logic high when
the bus lines are shorted, left open, or when no driver is active. The driver outputs are in high
impedance when the supply voltage is below 2.5 V to prevent bus disturbance during power cycling or
during live insertion to the bus. An internal current limit protects the transceiver bus pins in
short-circuit fault conditions by limiting the output current to a constant value. Thermal shutdown
circuitry protects the device against damage due to excessive power dissipation caused by faulty
loading and drive conditions.
The SN75HVD1176 device is characterized for operation at temperatures from 0°C to 70°C.
The SN65HVD1176 device is characterized for operation at temperatures from –40°C to 85°C.
For an isolated version of this device, see the ISO1176 device (SLLS897) with integrated digital isolators.
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