single flip flop

but afaict only rising edge

-Lasse

Yes, found those (well other peoples equivalents). But need falling edge. ye olde 7473 is falling-edge, so I would have thought there would be a single channel equivalent somewhere. Or some other low pin count divide-by-two.

Thanks,

I had some bad experiences with the 74LVC1G175 and associated chips of that family. They had a shootthrough pulse of over 1 Amp that lasted about 3 ns during output transitions! But, they were 5 V.

I changed to the 74AUP1G175 and series, and the power rail noise was at the limit of detection, running on 3.3 V rails. This is a D flop with an asynch reset. I'm not sure these can do the logic you need. A quick search doesn't show a J-K style flop, but if you add an inverter to a D-flop you can get divide by two. These are usually positive-edge clocking, though.

Jon

Oh yes, try it with an 8 channel part (LVC245) :)

I don't think I can get around the +ve clock without an inverter (which works fine but defeats the point of a low pin count device).

Summer is almost over, too late to buy flip-flops. Oh, wait ...

I don't think there is enough of a market for negative-trigger singles. But if space is the problem you can get the 74HC73 in TSSOP.

Yes thanks, looks like that is what I will do.

John Devereux schrieb:

Hello,

I looked at the web page of TI, there are 38 JK flipflops, but none of them has a smaller package than 14 pins. All are dual flipflops.

But under Little Logic, there are single flipflops with 5, 6 or 8 pins, but all are positive edge triggered. What about an additional inverter?

Bye

Hi, yes, that seems to be the situation.

There are no low pin count, negative edge triggered flipflops.

(now someone will find some gallium arsenide thing...)

Thanks,

;)

-Lasse

Nice part. Triggers on either edge, but it's SiGe, not GaAs.