https://www.digikey.com/product-detail/en/on-semiconductor/MC74VHC1G86DTT1G/MC74VHC1G86DTT1GOSCT-ND/2705092
https://www.digikey.com/product-detail/en/nxp-semiconductors/74HC74D,653/568-1490-1-ND/763395


> On Jul 6, 2016, at 8:39 PM, Charles Steinmetz <[email protected]> wrote:
> 
> Nick wrote:
> 
>> I got the boards back, and Charles’ version with just two D FFs and a single 
>> XOR works perfectly. It works even without the delay line he indicated
> 
> I have never needed the delay in practice, either (I use mostly NC7SZ, 74AC, 
> and 74HC logic).  Modern logic is vastly more forgiving WRT setup and hold 
> times compared to the bad old days.  I showed the delay just in case someone 
> built it without and it didn't work.
> 
> What specific chips did you use?
> 
> Best regards,
> 
> Charles
> 
> 
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