I've got an application where I'm driving 90 bicolor LEDs using a 180 bit
shift register (23 TC74VHC164FT) running at 3V. The SPI output of a PIC is
driving this. Towards the far end of the shift register, I start getting
errors (bit offsets). I suspect this is ringing on the clock line causing
multiple shifts per clock, or perhaps propogation delay on the clock line
causing the output of one shift register to be sampled after the previous
bit has changed instead of before. Anyone have any suggestions on driving
long shift registers like this?

THANKS!

Harold


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