What are the requirements for OSC1?

Sens-a-Dat

I am considering the use of an external clock signal to be used for the SX48. I understand the signal is to be connected to OSC1.

What are the electrical requirements for this to work properly?

Thank you,
Gary

Zoot

TTL

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dkemppai

Sens-a-Dat said...
I am considering the use of an external clock signal to be used for the SX48. I understand the signal is to be connected to OSC1.

What are the electrical requirements for this to work properly?

Thank you,
Gary

5V Cmos or TTL. Nothing below that seems to work. You probably won't find it in the data sheet.

(I know, I have a batch of boards with 3.3V osc's. And they won't clock the SX! Have to manually modify each board for a 5V osc)· [noparse]:([/noparse]



-Dan


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LoopyByteloose

Does this mean that an Xtal with the SX powered at 3.3v will not clock as well?

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PJMonty

Dan,

I have a project that runs at 3.3 volts and has a 3.3 volt oscillator chip driving it and it all works just fine. Are you trying to use a 3.3 volt clock with a 5 volt SX project? The project in question is the 6 port RS-485 hub that I built. There's a two part article I wrote about it in Circuit Cellar a few months back. I use a pre-packaged clock chip and divide it by two using a 74LV74, which is basically the 74xx TTL parts designed to run on anything from 2 to 5.5 volts.

Thanks,
PeterM