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USB 2.0 mux offers >12kV ESD performance

Posted: 31 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:multiplexer? mux? USB 2.0? ESD?

ISL54222A mux

Intersil Corp. has released an IC solution for portable products where internal USB high-speed ports need to share a single USB connector. The ISL54222A multiplexer is bidirectional and allows sharing of a host USB port between multiple outputs such as in desktop computers, laptops, portable mini-printers or docking stations.

The ISL54222A is a single-supply USB 2.0 high-speed multiplexer that is designed for switching or routing of USB high-speed signals and/or USB full-speed signals in many types of portable battery powered products. It operates from a single 1.8V to 3.3V supply and features Human Body Model ESD performance of >12kV on I/O terminals. The device features internal charge pumps that lower switch resistance and open the USB eye for better performance at 480Mbit/s. It contains two single pole/double throw switches configured as a double poledouble throw.

Fail-safe operation provides low switch leakage when the power is off, which prevents the device from being accidentally turned on while in the power-down state. Power-saving output-enable control allows all switches to be open when no USB interface is in use, which reduces power consumption to less than 1?A. Low Ron and low-capacitance switches meet USB requirements while providing operating margins for noise and cable reflections. Able to tolerate over-voltages beyond the supply rails, the ISL54222A also meets USB 2.0 short-circuit requirements without needing additional external components.

The 5.5? switches can swing rail-to-rail and were specifically designed to pass USB full-speed data signals that range from 0V to 3.6V and USB high-speed data signals that range from 0V to 400mV with a single supply as low as 1.8V. They have high bandwidth and low capacitance to pass USB high speed data signals with minimal distortion

The ISL54222A is available now in 10-Ld ?TQFN, TQFN and MSOP packages. In 10-Ld MSOP tape-and-reel option, the product is priced at $0.52 per 1,000 units. In 10-Ld 1.8mm x 1.4mm ?TQFN tape-and-reel option, the cost is $0.52 per 1,000 units. The price for 10-Ld TQFN tape-and-reel is $0.52 In 10 lead 2.1mm x 1.6mm ?TQFN tape-and-reel, the pricing is $0.52 per 1,000 units. It operates over a temperature range of -40C to +85C.

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