Suggestions for Clock distibution

[johnny1]

Hello guys,

I know that i can distibute the clock signal inside a player or a DAC using standard NAND or NOT chips.
The problem is that usually, they are not fast enough to deliver a clean and sharp pulse to the rest of the chips.

Anyone knows a fast logic family or line driver for this?

[gmarsh]

74VHC and 74AC are plenty fast.

[Jocko Homo]

I see lots of jitter in your future, as I sense you plan to use too many gates.

AC logic? Have you ever heard of ground bounce? Trying running your clock through an IC of that stuff with all the gates operating. You'll be sorry.

Jocko

[Bricolo]

So, what's better?

Using the "bare" clock output for every chip? (all in parallel)

[gmarsh]

Originally posted by Jocko Homo
AC logic? Have you ever heard of ground bounce? Trying running your clock through an IC of that stuff with all the gates operating. You'll be sorry.

Jocko

The guy wanted fast clock edges, and AC will provide that. Ground bounce? that's up to the designer to minimize that.

Good decoupling and power distribution practice combined with a bit of common sense - eg, don't do a 10:1 fanout from an AC logic output - and you're in good shape. The Johnson/Graham "High Speed Digital Design - A Handbook of Black Magic" is an excellent reference for this kind of stuff.

[linhsichi]

74VHCU **

[Elso Kwak]

Originally posted by linhsichi
74VHCU **

Why U = unbuffered?

[linhsichi]

Originally posted by Elso Kwak



Why U = unbuffered?

YES !
Is Toshiba (Japanese company) product !

To refer to site
http://yasu-audio.com/dsix105_02.html
http://yasu-audio.com/
http://myweb.hinet.net/home1/prbstech/DSIX/DSIX-1.htm

[jwb]

You might try ABT or ACQ. ABT have high fanout and ACQ have controlled edge rates.

For cleanest outputs, tie unused inputs to other inputs (or to Vcc).

[tube-lover]

hi,

74VHCXX or 74HCXXXX also a good choice.

thx

thomas