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October 2009
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The ISL54230 from Intersil has eight individual single pole double throw (SPDT) switches whose performance has been designed to enable them to pass a wide range of precision voice and data signals.
 With the addition of logic control, the switches can be configured to multiplex between pairs of signals like USB 2.0 high speed ports or between groups of signals like SIM card clock, data and power lines. To minimise board space, the signal pins on the ISL54230 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 ISL54230 allows dual baseband chips to access either of two SIM cards while allowing the unused SIM card to be powered down in order to minimize battery drain. All signal lines have greater than 8kV ESD protection allowing for much safer SIM card insertion and removal.
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Author
Graham Pitcher
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