Assertion: frequency detector | /r/MadeOf | four flip-flops
Facets:
value: originally
type: MANNER
Source sentences:
text: A phase frequency detector (PFD) is an asynchronous circuit originally made of four flip-flops (i.e., the phase-frequency detectors found in both the RCA CD4046 and the motorola MC4344 ICs introduced in the 1970s).