[sdiy] diff between A and B CMOS

[Ken Stone]

4016 and 4049 are weird cases. I don't think a 4016 can actually be
buffered, no matter what suffix is on the package. The more "advanced"
version is the 4066. 4049 may well be availab as a UB version even now. Note
also that it's output current can be asymetrical (UB variants).

Ken


>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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Ken Stone   sasami at hotkey.net.au
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