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Tool/software:
Dear Technical Support Team,
Q1
Regarding SN74LV series, SN74HCS series and SN74AHC series
Is it possible to provide typ and max data for the input capacitance Ci of each series?
■Target device
◎SN74LV series typ value only
SN74LV125A
SN74LV14A
◎SN74HCS series max value only
SN74HCS125
SN74HCS14
◎SN74AHC series typ value, max value
SN74AHC125
SN74AHC14
Q2
Also, is there any difference in the input capacitance capability values when replacing the devices in each series?
If so, how much is the difference?
Best Regards,
ttd
Hi,
Unfortunately, this is the data that we have available. Worst case for any device, the Ci should not be more than 15pF.
When choosing a family to use, I would not use input capacitance to choose, rather use the specific features that each family has.
For example, the LV family has the highest drive strength, or, the HCS family has Schmitt-trigger inputs.