Electronic – the optimum distance between a micro-controller and a crystal on a PCB


I wanted know what should be the optimum distance between a microntroller(AT89C51ED2) and a crystal of frequency 11.0592MHz?

Best Answer

Once again, Atmel app notes to the rescue:

Atmel AVR 8-bit Microcontrollers Application Note - AVR042: AVR Hardware Design Considerations

Crystal/oscillator advice starts on page 13 and on page 16, it recommends a "Short distance between the crystal/capacitors and the MCU". Also, an example layout on page 18 shows how they laid-out the crystal circuit.