Hi folks,

SPI bus is usually used for inter-chip communication on a single board. I have an application where I have taken it down four feet (1.2 metres) of ribbon cable with only a 74HC125 to buffer/ drive the lines. This approach worked fine- low emissions too, since the line capacitance slowed down all the clock edges quite nicely.

But now I have been asked for a 30 foot cable version (10m) Without wanting to change the design too radically, what would be a good scheme to get the SPI buffered off board down the long cable.

By the way I am only clocking it at 100Khz.

Has anyone tried using LVDS, and if so, which chipsets ? 100K is too fast for RS232 chips, could RS485 work at that baud rate ? I only need three drivers and three receivers.

Steve