What is the differential input impedence of a 74F00 below th

What is the differential input impedence of a 74F00 below the switching threshold?

Any help would be appreciated!

Solution

Differential Input inmpedence of 74F00 is arounf 20 ohm below switching treshold, The IC mentioned in the question belongs to the low power schottky family, as we know that schottky junctions are have heterogenous arrangement hence low value of resistive load is always connection to it to prevent thermal runaway in the IC and prevent serious IC damage or burnout