Question on CD4027BE dual J-K flip-flop...

Hmmm, not enough information to make an educated guess.

According to the data sheet Maximum Value of DC Supply Vdd to Vss is

What it should be is that ever is connected to pins 16 Vdd and pin 8 Vss.

A schematic would help to not guess, but with the limited information you gave, what did you expect ??

don

Yes, unless you're asserting both Preset and Clear, in which case the outputs will be the same (defined by the part).

It is whatever logic 1 and logic 0 is defined to be and the way the component is connected, (usually Vcc/Vdd and ground).

"Logic 1 and ground" makes no sense. "Logic 1" is whatever level you define to be "logic 1". Ground is a voltage and independent of the logic level assigned to it.

Most often, Logic 1 is defined to be your positive voltage (in this case 5V) and logic 0 to be ground. You can define them the other way, if it suits your purposes. It is unlikely that '1' is +5V and '0' is '5V, but it is certainly possible if your FF is wired from +5V to -5V.

Yeah, sorry. Guess I didn't provide much info. Apologies. Obvious newbie here.

Let me try to post a schematic to abse and see if I can correct the situation. Do appreciate your patience.

Dave

Just posted the schematic and a description of its supposed operation to abse. Please fire away with any questions, criticism, whatever.

Thanks,

Dave

Assuming "true" logic, logic 1 is Vdd (or Vcc as it's sometimes called.) Logic 0 is ground.

Vdd is, electrically, whatever voltage you decide to use. Might be +5, might be something else.

John

Hey John,

Please see my post on alt.binaries.schematics.electronic. It contains the (cleaned up) schematic and the problem I am trying to address at this time.

Thanks,

Dave

Thanks for the schematic.

As I stated previous, the outputs will be whatever is connected to Vdd and Vss. Your schematic has +5/GND so the outputs can not be anything but those values.

I also see that the -5V supply is connected to only pin 7 on the

-5V will never by output from the 74HC5043 unless there is a -5V input.

This schematic requires me to "wire up" the missing connections from the

Thats your job, please correct this schematic and re-post.

don

Yes, I realized this along the way. sigh. But I am still left wondering why I have to fiddle with Q2 and not-Q2 to get full functionality.

Yeah, I'm working on that. Felt I ought to post what I had so far, and try not to make anyone wait for days and days before they saw *anything*, just in case the answer was something so obvious I could be the only one missing it. Will rework and repost. Thanks for your patience.

Dave

Just posted the reworked schematic to abse.

Thanks again,

Dave

If you're powering your chip from 5V, yes, Q & -Q should be either 5V or