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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

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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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