A digital board carries flip-flops

PHYSICS · Multi-part · Fermi University Physics · Electronics, Instrumentation & Communication · Digital electronics, embedded systems and data acquisition · Digital electronics, embedded systems and data acquisition

Electronics for Measurement, Ch Digital logic and its physical realisation

Problem

A digital board carries

40

flip-flops, each with an average load (its own gate capacitance plus the wiring and fan-out it drives) of about

5\,\mathrm{pF}

. The board is clocked at

25\,\mathrm{MHz}

from a

3.3\,\mathrm{V}

supply, and on average each node charges from low to high on half of the clock cycles (activity factor

\alpha = 0.5

). ((a)) Estimate the total dynamic supply current drawn by these nodes. ((b)) Estimate the total dynamic power dissipated.

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