[sdiy] bypass caps for TTL

[Cynthia Webster]

on 3/10/05 7:14 AM, rkmoore at memphis.edu at rkmoore at memphis.edu wrote:

> Hi everyone,
> 
> I'm working on a project for school that uses lots of TTL IC's.  I
> remember hearing that I should probably use bypass capacitors between
> the +Vcc and ground on each IC.  What type of caps should I use and
> what value?  Any suggestions?

Hi Richard!

.1 Mfd is typical up to 3 Megahertz,
(twenty years ago .01 was more popular)

If your circuit is high-speed say around 20 megahertz then you'd
actually want to go smaller since the recharging time for the cap is
quicker.  faster = smaller such as a value of 0.047uF.

I use .1 Mfd  ceramic bead capacitors all the time with success,
although there are a zillion different types that would work,
these are fairly compact.

Here is the part number for www.mouser.com

581-SA115C104K

Best Wishes!


Cynthia

http://www.cyndustries.com/

> 
> Thanks,
> 
> Richard Moore
>