I have a design that uses 3 74HT165 too, all clocked with the same data
line. I am using a PIC16C57.  The board is approx. 3x4 In. I never have any
trouble with the design, even when it was on the breadboard. I did try to
keep the signals lines as shord as possible. On the bread board the total
length of the clock line was about 9 inches. Still no trouble. The PIC is
running at 4 Mhz. I did add a small delay after changing the clock state and
reading the data. About 1 ms it think. That delay is probebly the reasi I
didnt have any trouble. The delay works great because I done need a really
fast transfer rate.

Or I'm really lucky.. :)

Alan Nickerson


-----Original Message-----
From: Vincent Deno <denovj@EMAIL.UC.EDU>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Sunday, January 31, 1999 11:21 PM
Subject: Re: Problem with 74HC165 shift registers


>I am currently in the process of implementing a design which will be using
>four 74HC165s daisy-chained, all on the same clock line.  Unlike your
>design, all 4 will be on the same board which is approximately 2"x7".
>
>Unfortunately, there is little/no room for additional chips so "playing it
>safe" and using your fix is really not an option.  I was wonderng if it is
>likely I will run into a similar problem or must I rethink the design?
>
>Thanks,
>Vince Deno
>