Electronics > Projects, Designs, and Technical Stuff

Is there a better logic part for this than CD74HC73E

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alank2:
I want to automatically assert the /WAIT line on a Z80 when it asserts the /IORQ line.  I only want it to assert on the high to low TRANSITION of /IORQ - I want to be able to reset it and release the /WAIT even while /IORQ may still be low.  Is there a better, more common part to use than CD74HC73E, preferrably in AHC ?

T3sl4co1l:
Invert IORQ into type D ('74)'s CLK, D = 0, CLR = 1, PRE = release wait?

D f/fs are pretty standard, always been my impression that JKs are archaic?

Tim

Benta:

--- Quote from: T3sl4co1l on March 08, 2019, 06:50:02 pm ---
D f/fs are pretty standard, always been my impression that JKs are archaic?


--- End quote ---

Certainly not!
The JK FF is one of the most powerful logic building blocks available.
If you have JK-FFs and D-FFs (plus gates of course) in your toolbox, you can do everything. Really everything.
But you do need both.

SiliconWizard:
Off the top of my head, it should be possible to achieve the same with (clever use) of a 74AHC123, which are readily available (whereas the 73 is not). To be checked though.

Benta:
How on earth could a monostable multivibrator replace a JK FF?

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