1 Features

• Optimized for PROFIBUS® networks

– Signaling rates up to 40 Mbps

– Differential output exceeds 2.1 V

(54-Ω load)

– Low bus capacitance of 10 pF (Max)

• Meets the requirements of TIA/EIA-485-A

• ESD Protection exceeds ±10-kV HBM

• Fail-safe receiver for bus open, short, idle

• Up to 160 transceivers on a bus

• Low skew during output transitions and driver

enabling and disabling

• Common-mode rejection up to 50 MHz

• Short-circuit current limit

• Hot swap capable

• Thermal shutdown protection

2 Applications

• Process automation

– Chemical production

– Brewing and distillation

– Paper mills

• Factory automation

– Automobile production

– Rolling, pressing, stamping machines

– Networked sensors

• General RS-485 networks

– Motor and motion control

– HVAC and building automation networks

– Networked security stations

3 Description

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 distortion.

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.