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Subject: Re: 74HCT output to cable
Date: Thu, 9 Jan 2003 22:14:43 -0500
Organization: ITServices, University of British Columbia
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I haven't found any 74HCT in the local electronics store so I bought a
74LS90. I am using it as a decade counter to reduce the frequency. The
socket the output signal from 74LS90 needs to go in supports 3.5mm stereo
jack. So I bought a 3.5mm stereo jack with a 12feet extension cord from
radio shack. There is no specification on the plastic bag with the cord so I
don't know anything you've asked. Maybe I should just go ahead and try
connect them together directly?
BTW, the load is a TTL 5V compatible device that will use the 74LS90 output
as an external sync.
> Kind of broad.
> 74HCT what? Some are capable of driving cables, some are not.
> What kind of cable and how long? Do you know the what the
> attenuation per unit length is? Do you know what the capacitance
> per unit length is? The characteristic impedance?
> What does the signal you want to push down the cable look like?
> What does the load look like?
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