[sdiy] diff between A and B CMOS

[sdiy at haraldswerk.de]

The change from the A to the B series was in the mid seventies. 1976 the JEDEC 
standard was established. Before that, you cannot swap CMOS parts from 
different manufacturers as easy as today. They where often different 
electrically.
The B means buffered. Buffered are the outputs. There are a few exceptions. 
They are named UB (UnBuffered)

The switch from A to B Series may be the reason. If special characteristic 
from the A series of a certain manufacturer is used.

Harald



Am Donnerstag, 1. Mai 2008 02:05:55 schrieb mark verbos:
> When CMOS went from original A series to the B series, did the
> resistance of 4016 analog switches change? Did the voltage swing at
> the outputs of 4049s change?
>
> I'm working on a quantizer module that was designed in the 70s and
> overhauled int he 90s with all new chips. The scale is now screwed up
> and I'm wondering if its because of the switch from A to B series in
> these chips.
>
> Anyway, I'm going to install a trimmer where there wasn't one. I'm
> just curious really.
>
>
> mark
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