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| Sharing 12mhz oscillator between multiple uC's |
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| gsm2k:
Hi! I am using an 12MHz oscillator in my design providing clock to a FT4232 quad uart chip and have recently added a new USB hub controller also requiring a 12MHz clock. The oscillator I'm using is a 3.3V HCMOS type https://abracon.com/Oscillators/ASFL1.pdf Can I safely share this oscillator between the IC's or are there some potential issues I'm not considering? I will off course keep the lines as short as possible. |
| Bassman59:
--- Quote from: gsm2k on October 24, 2018, 09:17:52 pm ---Hi! I am using an 12MHz oscillator in my design providing clock to a FT4232 quad uart chip and have recently added a new USB hub controller also requiring a 12MHz clock. The oscillator I'm using is a 3.3V HCMOS type https://abracon.com/Oscillators/ASFL1.pdf Can I safely share this oscillator between the IC's or are there some potential issues I'm not considering? I will off course keep the lines as short as possible. --- End quote --- Use a multi-out buffer such as this. |
| BocaDev:
--- Quote ---Hi! I am using an 12MHz oscillator in my design providing clock to a FT4232 quad uart chip and have recently added a new USB hub controller also requiring a 12MHz clock. The oscillator I'm using is a 3.3V HCMOS type https://abracon.com/Oscillators/ASFL1.pdf Can I safely share this oscillator between the IC's or are there some potential issues I'm not considering? I will off course keep the lines as short as possible. --- End quote --- I have in the past taken the output (xtal) drive pin of one chip that has the xtal connected to it and coupled it to the input pin (xtal) though a 100pf cap. The output (xtal) pin is left unused. If you look at the data sheet of each IC, there are two pins for connecting an external xtal to the IC. One pin is xtal input, and the other pin is labeled as xtal output. |
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