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The datasheets for some logic ICs do not show the maximum operating frequency. What is their maximum operating frequency?

The maximum operation frequency of these logic ICs can be estimated as follows using the propagation delay times (tpLH and tpHL) shown in the datasheet.

Maximum operating frequency ≈ 1/(tpLH + tpHL)

The result of this calculation should be considered merely as an estimate under the conditions shown in the datasheet.

Such logic ICs should be sufficiently evaluated to ensure that they work properly under the actual operating conditions because their propagation delay times change with the board capacitance and other conditions.

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