Holt Integrated Circuits, a world leader in data bus ICs for commercial and military avionics, expanded its RS-485/422 transceiver family to include devices optimized for higher bit rates. The HI-4853/54/55 family broadens the existing portfolio by offering devices optimized for data rates up to 20Mbps (100 ft. CAT-5 UTP).

All devices in the family offer extended power supply range (3.0V to 5.5V), controlled slew rate and a wide common mode voltage range (-16V to +20V for half-duplex, +/- 24V for full-duplex). Driver slew rate control and pre-emphasis ensure optimum performance in environments having strict EMI/EMC requirements, such as avionics flight controls and industrial automation. Each device delivers at least +/- 1.50V and +/- 2.45V output drive at worst-case supply voltages of 3.0V and 4.5V respectively, over an extended temperature range of -55oC to +125oC into a differential load of 54 Ohm and 50pF.

The receiver offers true Fail-Safe operation, providing a guaranteed logic high output when the bus is open-circuit, short-circuit or idle (terminated but not driven). The receiver minimum input resistance is 90 kOhm, supporting up to 224 nodes per bus.

"Holt's RS-485/422 transceivers provide competitive solutions for demanding applications," said Anthony Murray, Director of Business Development at Holt. "These new devices are ideal for high speed avionics or industrial control applications such as MMSI (EBR-1553) or Profibus".

The HI-4853 operates half duplex whereas the HI-4854 and HI-4855 provide full duplex operation. Multiple package options are offered, including industry standard SO-8 pinouts. The HI-4852 and HI-4855 are available in compact 4mm x 4mm QFN-16 packages.

Devices are priced from $2.96 in 1K quantities and are available immediately.