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At the moment I'm working on a system which will use a 400KHz I2C bus. The bus wires (SCL, SDA) are different lengths by a few cm, so the delay between them will be in picosecond to nanosecond range - I don't think I need to worry about this but am I misguided?

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For anything under 50MHz, difference in trace lengths like that wouldn't be a concern.

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  • \$\begingroup\$ I referred to 'trace lengths' but it just sank in you said 'wires'. Propagation delays still won't be a problem with wire, just don't coil up the excess, that would give you unwanted inductance which could take the nice sharp edges off the logic signals. \$\endgroup\$ – JustJeff Oct 23 '10 at 22:12

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