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Power-efficient RS-485/RS-422 receiver line debuts

Milpitas, Calif.—Intersil has designed its ISL328xE series of single RS-485/RS-422 receivers (Rx) with 16.5-kV IEC61000-level ESD protection and an ultra-low supply current requirement in a small SOT-23 and TDFN packages.

The ISL328xE are full featured receivers including 1/8th unit load input resistance (allowing up to 256 devices on the bus), full fail-safe (open, short, and terminated but undriven); along with the enhanced ESD protection on the Rx input pins. The receivers all operate from a wide supply range of 3.0V to 5.5V and at data rates up to 20-Mbits/s.

The ISL328xE family has low quiescent supply current (Icc = 500uA max) that is 1/30th the value of the nearest competitor, according to Intersil. Additionally, the devices with an enable pin (ISL3281E, ISL3282E, and ISL3283E) can be put into a low power shutdown mode (Icc = 20µA max) to further reduce power consumption whenever the receiver is disabled. The ISL3281E has an active high enable while the ISL3282E and ISL3283E feature an active low enable for design flexibility.

The ISL3282E and the ISL3284E have on board level translators on the enable input and Rx output pins that simplify the design of mixed voltage systems. The logic supply pin (VL) can be connected to a lower voltage processor supply to level shift the input and output voltages to values compatible with the processor supply. This eliminates the need for external level translators.

The ISL3280E, ISL3281E, ISL3283E, ISL3284E come in SOT-23 packages that occupy a 3mm x 3mm foot print. The ISL3282E comes in a tiny 2mm x 3mm TDFN package for additional board space savings and enhanced thermal performance. All versions are offered in the industrial (-40C to +85C) and extended industrial (-40°C to +125°C) temperature ranges for enhanced overall reliability.

Pricing: 1,000-unit quantities are $0.68 for industrial temperature grade and $0.95 for extended industrial temperature grade.
Availability: Now in a variety of configurations: ISL3280E in 5-lead SOT-23 packages; ISL3281E in 6-lead SOT-23 packages; ISL3282E in 8-lead TDFN packages; ISL3283E and ISL3284E, both in 6-lead SOT-23 packages.
Datasheet: click here.
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Intersil Corp., 1-408-432-8888, www.intersil.com

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