[time-nuts] Electronics Question

lists at lazygranch.com lists at lazygranch.com
Thu Jul 28 03:19:03 UTC 2011


Note the phrase "as a side note." ;-)

No way should you connect a TTL output to a 232 output. 

Ahem (cough cough) as a side note, the 232 jitter is so bad you can see it on a storage scope. It varies from chip to chip, but a microsecond RMS isn't out of the ballpark. 


------Original Message------
From: Chris Albertson
To: lists at lazygranch.com
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Electronics Question
Sent: Jul 27, 2011 2:35 PM

On Wed, Jul 27, 2011 at 2:09 PM,  <lists at lazygranch.com> wrote:

> I don't follow exactly what you are doing here, but 232 receivers are generally TTL compatible....

I think the OP has a TTL signal and wants to by-pass the MAX
rs232->ttl chip.   So talk about timing problems are moot as the OP
intends not to use the chip.   His question is if he can connect his
TTL signal to the TTL output of the MAX chip.    I said as a practical
matter "no".  He is best to remove the chip.

Chris Albertson
Redondo Beach, California


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