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Intersil - Octal switch provides ESD protection for switching and routing of diverse signal types in high-end cell phones

23rd July 2009

Intersil Corporation (USA)

ES Admin

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Datasheet

Said to offer 4 times the ESD protection of competitive solutions, Intersil’s ISL54230 octal switch provides a simple, space-efficient way to interconnect baseband chip, application processor, internal SIM cards and other support chips in full-featured SmartPhones. The ISL54230’s small size and flexibility allows designers to optimize the routing of the many different types of signals found in high-feature-set cell phone products.

The ISL54230 has eight individual Single Pole Double Throw (SPDT) switches whose performance has been carefully designed to enable them to pass a wide range of precision voice and data signals, including high-speed USB, UART, PCM, audio and power. With the addition of simple 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 minimize 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.