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• Place components on the board before determining connector pin assignments.
• Let the circuit board layout dictate the connector pin location and function assignment.
• Divide the circuit board into different DC voltage areas (12 V DC area, 5 V DC area, etc.).
• Laterally segregate components based on the DC voltage that they use.
• Do not allow different DC voltage planes to overlap one another.
• Components using multiple DC voltages must straddle the boundary between the different voltage areas.
• Keep all connectors on the same edge of the board.
• Keep MHz circuits away from connectors. Do not allow MHz circuits to be located between connectors.
• Keep all I/O drivers very close to the connector. Avoid letting the I/O lines come too far onto the board.
• Provide space for shunt capacitors on all I/O lines.
• Locate components to minimize the length of high speed clock lines.
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