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July 23, 2009

Intersil rolls out new octal switch

8kV ESD protection for switching and routing of diverse signal types in high-end cell phones

By CBR Staff Writer

Intersil has unveiled the ISL54230, a new octal switch suitable for high-end cell phone applications. The new octal switch’s size reportedly allows designers to optimise the routing of the different types of signals found in high-feature-set cell phone products.

According to Intersil, the new octal switch features include: high-speed (480Mbps) and full-speed (12Mbps) signalling capability per USB 2.0, compliant with USB 2.0 short-circuit, rail-to-rail analogue signal switching, 1.8V logic compatible (2.7V to 3.6V supply), switch terminals overvoltage protected up to +5.5V, and dual output-enable controls for selective shutdown of switches when not in use.

Intersil said that the new octal switch has 8 individual Single Pole Double Throw (SPDT) switches which have been designed to enable them to pass a range of voice and data signals, including USB, UART, PCM, audio and power.

With the addition of logic control, the switches can be configured to multiplex between pairs of signals like USB 2.0 ports, or between groups of signals like SIM card clock, data and power lines, the company added.

Reportedly, to minimise board space, the signal pins on the new octal switch have been arranged in a ‘flow-through’ manner to avoid signal crossovers on the PCB. Unused switches can be powered down as required under logic control.

For dual-mode cell phones, the new octal switch allows dual baseband chips to access either of two SIM cards while allowing the unused SIM card to be powered down in order to minimise battery power. All signal lines have greater than 8kV ESD protection for safer SIM card insertion and removal, the company said.

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