[sdiy] 4042 latch question

[Dave Magnuson]

At 01:33 PM 12/1/02 +0100, mark verbos wrote:
>You could try putting some resistors to the + supply in betweent he 
>chips. Maybe it will be pulled up to switching between +3 and +8 insted 
>of ground and +5 then, That woudl work I think.
>
>mark



I've never tried Mark's idea, but it may work....

But:  common sense tells me you would also want a diode between the
lower-voltage chip and the pull-up resistor to prevent damage

Dave






>
>Peter Grenader wrote:
>
>>You've got to be kidding me.  So it ain't so!  To quote Bart Simpson
>>
>>"Oh Mee-aan"
>>
>>You mean i'm going to have to install...transistors????  i hate having to
>>duts with transistors.  Would a 4050 see that 5 volt high? (its quoted as
>>being able to do voltage converstions).
>>
>>thanks for this and let me know,
>>
>>P
>>
>>
>>Paul Schreiber wrote:
>>
>>>CMOS switches at .3VCC and .7VCC. So for a +12V system, the HI threshold is
>>>8.4V.
>>>
>>>Paul S.
>>>
>>
>>
>>>>if it's running off of +12, is there any reason the latches will not
respond
>>>>to an input where the high state of the D inputs only goes to 5 volts?
>>>>
>>>>
>>>
>>
>>
>>
>
>

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