Nexperia

HEF4518B

Dual BCD counter

Table 8. Dynamic power dissipation PD

PD can be calculated from the formulas shown. VSS = 0 V; tr = tf ≤ 20 ns; Tamb = 25 °C.

Symbol Parameter

VDD

Typical formula for PD (μW)

Where:

5 V

PD = 750 × fi + Σ(fo × CL) × VDD 2

10 V

PD = 3300 × fi + Σ(fo × CL) × VDD 2

PD

dynamic power

dissipation

15 V

PD = 8000 × fi + Σ(fo × CL) × VDD 2

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VDD = supply voltage in V;

Σ(fo × CL) = sum of the outputs.

HEF4518B

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Product data sheet

Rev. 9 — 3 December 2021

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