Delete comment from: Ken Shirriff's blog

Rob said...

Hi Ken,

I'm always excited to see a new "Righto - new message" announcement in my inbox, and this installment didn't disappoint.

I've been doing a lot of reading on early flip-flops and your "sense amp" flip-flop caught my eye. I think you may have found a D-type double edge triggered (DET) flip-flop of the type described by Gago et al:

A. Gago, R. Escano, and J. A. Hidalgo, “Reduced implementation of D-type DET flip-flops,” IEEE Journal of Solid-State Circuits, vol. 28, no. 3, pp. 400–402, Mar. 1993, doi: 10.1109/4.210012.

Here's a link to an Electrical Engineering Stack Exchange question about it that includes the diagram and a link to the academic paper that explains its operation:

https://electronics.stackexchange.com/questions/245695/dual-edge-triggered-d-flip-flip-cmos-implementation-less-than-20-transistors

I'm looking forward to your next posting.

Thanks,

Rob

Aug 21, 2025, 9:47:05 AM

Posted to Here be dragons: Preventing static damage, latchup, and metastability in the 386