The SN74HC74 is a clocked device. As such, it requires special timing considerations to ensure normal operation.

Primary timing factors to consider:

• Maximum clock frequency: the maximum operating clock frequency defined in GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.html#GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD is the maximum frequency at which the device is guaranteed to function. This value refers specifically to the triggering waveform, measuring from one trigger level to the next.
• Pulse duration: ensure that the triggering event duration is larger than the minimum pulse duration, as defined in the GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.html#GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.
• Setup time: ensure that the data has changed at least one setup time prior to the triggering event, as defined in the GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.html#GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.
• Hold time: ensure that the data remains in the desired state at least one hold time after the triggering event, as defined in the GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.html#GUID-437EFFBC-90BB-4A7B-BB0F-2ADC585814CD.