http://cgi.ebay.ca/HP-AGILENT-3314A...temQQptZBI_Signal_Sources?hash=item5ad6b7aa0b

 

I have to plead distraction. We have company here, and I was trying to answer your question in-between conversations.

The SET and RESET inputs must be kept high, unless you want to either SET or RESET the output. They must not both be low at the same time.

both Set and reset are never high @ the same time , they are coming from a decade counter , they look exactly like my paint drawing , this is exactly what I see on my scope . So never low @ the same time , im confused ????

My circuit is the folllowing .

pin14-vdd 5 volts
pin7-ground
pin6-pin2
pin2-pin6
clock pin3-ground or vdd , no effect .

set pulse-pin 4

reset pulse - pin 1


Could it be because this is a preset and clear d flip-flop , different than a set reset ??

 

both Set and reset are never high @ the same time , they are coming from a decade counter , they look exactly like my paint drawing , this is exactly what I see on my scope . So never low @ the same time, I'm confused ????

It will not clock data through unless both the SET and RESET are high.
If SET is low, the Q output will be high, and the Q\ output will be low.
If RESET is low, the Q output will be low, and the Q\ output will be high.
If both SET and RESET are low, the outputs will be unstable.

Could it be because this is a preset and clear d flip-flop , different than a set reset ??

Yeah.
If you want it to act more like the CMOS IC you were using before, then use inverters to flip the signals going to the SET and RESET inputs.

 

I am not using clock for this config , I am past the divide by 2 .

I wanna operate this as a set/reset with my 2 pulses of short duty cycle coming from my decade counter , they look exactly like my drawing . Both my reset pulse and set pulse will be low @ the same time , that is a given ... never used to be a problem ...

If you want to use that input for this IC, you will need to use inverters on the SET and RESET inputs.

There really is no need to PM me on this.

 

Yes you were right Wookie .

<snip> Darn, I spent 8 hours trying to getting these 2 very simple things to work .

I think I am gonna ask digikey to refund me and some new ones to me pronto . , look @ how the advertised the 74hc74an functions .

http://search.digikey.com/scripts/DkSearch/dksus.dll

 

These forums are strictly G-rated. Use appropriate language.

Had more time been spent analyzing the truth table in the datasheet, you would not have experienced such difficulty.

It is not Digikey's fault that you did not properly interpret the datasheet. If the IC functions as described in the datasheet, it is not defective. I suppose you could return it, but you will likely have to pay a restocking fee; this is customary with most distributors.

 

O, sorry for the language , the rage has changed my mood .

Well guess what , I am gonna get 5 new chips free , and free shipping also .

All their dip chips on the first page were preset and clear .

They admitted it was a mistake on their part and didnt even debate further .

 

http://cgi.ebay.ca/HP-AGILENT-3314A...temQQptZBI_Signal_Sources?hash=item5ad6b7aa0b

 

Ok I wanna thx everybody for your inputs, this should be stickied .

I disagree about the sticky part.

Once again Wookie proves he knew about every single nook and cranny of electronics.

No, I don't pretend know everything about the field. However, I did prove that frequently I need to look at a datasheet more than once.

A set reset flip flop is not the same as a clear and preset .

Got the wrong chip from Digikey

Today was a bad day for hobby electronics .[/QUOTE]
If you got something to work and learned something in the process, it was a good day.