Where my knowledge is lacking is in understanding the purpose of having a backplane expander and how this relates to I/O bandwidth or performance.

Analog Devices, Inc., has introduced a mobile I/O expander and QWERTY keypad controller with ambient light sensing for smart portable devices that require a large keypad matrix and expanded I/O lines.

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Catalyst Semiconductor has added a 16-bit device to its family of I/O bus expander ICs. The CAT9555 comprises two 8-bit ports (16 I/O pins), which power up as inputs and can be configured as an input ...