[sdiy] ETI447

[Magnus Danielson]

From: harrybissell <harrybissell at prodigy.net>
Subject: Re: [sdiy] ETI447
Date: Wed, 07 Jul 2004 20:52:04 -0700
Message-ID: <40ECC4E3.2EE1BEED at prodigy.net>

Harry the Hairy BBD-lover,

> Rönnberg Niklas wrote:
> 
> > Well, I understand that since pin 1 (Vdd) and pin 8 (Vss) are both
> > connected to zero reference voltage. Pin 13 and pin 16 are not used
> > according to the datasheet, but why is pin 16 connected to zero reference
> > voltage in the ETI design (and pin 13 is not connected)?
> >
> > Maybe this is just some mistake in the original pcb layout and doesn't
> > affect anything at all, and maybe not...
> >
> > Best regards
> >
> > /a rather confused Niklas
> 
> Might be a legacy from CD4009 (the chip the 4049 replaced) ???

Yes and no. Yes, it makes sense, but no, you can't use a CD4009 the same way
due to it's internal. However, it is logical to hook that pin up like that if
you where doing it to a CD4009. A mental lapsus maybe...

Cheers,
Magnus