MacGyverS2000
Electrical
- Dec 22, 2003
- 8,504
I'm bumping up the clock speed on a PIC project (16F72) from the internal 4 MHz to an external 20 MHz. I can use a 20 MHz crystal with two external caps to the tune of $0.80, or a 20 MHz ceramic resonator with internal caps to the tune of $0.40 (which is about half of the size, to boot). Accuracy is not an issue.
However, reading the PIC's datasheet, Microchip lists a max clock speed in the ceramic resonator section at 16 MHz (I'm not sure if this IS the maximum possible, only the maximum listed with tested cap values).
So, other than accuracy over time/temp, is there any advantage/disadvantage to using a ceramic resonator with internal caps compared to a crystal with external caps?
However, reading the PIC's datasheet, Microchip lists a max clock speed in the ceramic resonator section at 16 MHz (I'm not sure if this IS the maximum possible, only the maximum listed with tested cap values).
So, other than accuracy over time/temp, is there any advantage/disadvantage to using a ceramic resonator with internal caps compared to a crystal with external caps?