[sdiy] Another new hard to find part....

[Magnus Danielson]

From: Harry Bissell Jr <harrybissell at prodigy.net>
Subject: Re: [sdiy] Another new hard to find part....
Date: Tue, 6 Jul 2004 10:09:56 -0700 (PDT)
Message-ID: <20040706170956.6351.qmail at web51002.mail.yahoo.com>

Harry the hairy,

> --- "Roy J. Tellason" <rtellason at blazenet.net> wrote:
> 
> > 
> > What's that,  the "B" series?
> 
> 
> Buffered.
> 
> There was an "A" series that was 'unbuffered'.
> 
> The input impedance of the A series would vary with
> the logic state of the inputs... so if you consider a
> three input gate... there would be different input
> requirements depending on how many other inputs were
> high
> or low.
> 
> A series has slightly less propagation delay. 
> 
> B series is the standard today...  but some devices
> are essentially A series (4049, 4069UB etc)

Actually, this is being a little too quick. Other parameters changed between
A and B series as well, such as power voltage. So, an A devices and an UB
devices is still different.

Cheers,
Magnus