Thursday, July 30, 2009

Intersil Unveils ISL54222A Integrated Circuit

Intersil Corporation has introduced an integrated circuit that offers features for portable products where internal USB high-speed ports may need to share a single USB connector. The ISL54222A is also bidirectional and allows the sharing of a host USB port between multiple outputs such as in desktop or laptop computers, portable mini printers or docking stations. It is a single-supply USB 2.0 high-speed multiplexer that can operate from a single 1.8V to 3.3V supply.

In addition, the device features human body model (HBM) electrostatic discharge (ESD) performance of more than 12kV on input/output (I/O) terminals. This combination of low supply voltage and high ESD protection makes the device flexible and robust for applications such as Smartphones, MP3 players, personal navigation devices and digital cameras. The product features internal charge pumps that lower switch resistance and open the USB eye for better performance at 480Mbps.

It contains two single-pole/double-throw (SPDT) switches configured as a DPDT. The part was designed for switching or routing USB high-speed signals and/or USB full-speed signals in many types of portable battery-powered products. Failsafe operation provides low switch leakage when the power is off, which prevents the ISL54222A from being accidentally turned on while in the power-down state.

A 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 1uA. 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 5.5ohm 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 uTQFN, TQFN and MSOP packages. Intersil Corporation is a designer and manufacturer of high-performance analogue and mixed-signal semiconductors.

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