[sdiy] CMOS chip questions

[Dave Kendall]

Hi all.

The datasheets for the 4009/4010 and 4049/4050 mention driving TTL 
loads. Can anyone see a problem with using, say a 4050, to convert (up 
to) +15V logic to drive a 74HC or a standard 4xxx part running from 
+5V? The 4050 would run from +5V at VDD. Just wondered if there was 
anything special about the outputs of the 4050 that might cause any 
problems for a 74HC.

Inputs to the 4050 would have pull-down resistors.

cheers,
Dave


On Jul 19, 2009, at 17:00, Dave Manley wrote:

> Dan Snazelle wrote:
>> hey by the way.,...when interfacing CMOS and TTL, i often see the 
>> 4008 mentioned...is this the best way to go?
>>
>>
> 4008?  I think you might mean CD4009/4010 or CD4049/4050?
>
> These allow you to translate from 0-15V logic levels to a lower 
> voltage.
>
> -Dave
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