The TC35893XGB and TC35894XBG flexible I/O expanders from Toshiba America Electronic Components simplify the addition of I/O peripheral ports so keypads, LEDs, and switches can interface seamlessly within a mobile handset or other portable consumer electronics device. The expanders also improve power efficiency in handheld devices and address the mechanical and electrical design challenges associated with moveable parts in mobile handsets.

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The advanced features on today’s handsets require peripherals for support, and to facilitate keyboard operation, slide-out and clam-shell configurations are popular. But these implementations present challenges because heavy wiring through the hinges can cause electromagnetic interference and mechanical stress.

The TC35893XBG and TC35894XBG solve these problems by dramatically reducing the wired connections in moveable handheld designs while still providing full flexibility. They can accommodate keypad layouts from 2-by-2 to 8-by-12 with up to 96 keys (88 keys for the TC35893XBG) and eight special function keys. Direct key support is available on the TC35894XBG. The devices also add support for both a direct CMOS clock and an internal RC-generated clock input, and they include a more flexible debounce period.

The TC35893XBG and TC35894XBG are available now for $1.00 each in quantities of 10,000.

• Toshiba America Electronic Components Inc.

Toshiba’s TC35893XGB and TC35894XBG flexible I/O expanders simplify the addition of I/O peripheral ports so keypads, LEDs, and switches can interface seamlessly within a mobile handset or other portable consumer electronics device.

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