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About Cin max of SN74LVC14A

Satoshi
Guru 19505 points
Other Parts Discussed in Thread: SN74LVC14A

Please let me know about Cin(max) of SN74LVC14A.

On application note (below URL) , it written in 10nF Cin spec, is it correct?

http://www.tij.co.jp/jp/lit/an/scea046/scea046.pdf

 

Best regards,

Satoshi

  • 0
    TI__Genius 14485 points
    Satoshi,Thanks for your question. We'll respond to you with an answer tomorrow.
    James
  • 0
    TI__Genius 14485 points
    Satoshi,
    The datasheet specifies the typical input capacitance to be 5 pF. I looked at the characteristic data we used to create the SN74LVC14A datasheet, and the maximum measured capacitance measured was 2.44 pf. It looks like 5 pf was the value chosen for the official datasheet parameter.
    James
  • 0 in reply to James Lockridge19
    Guru 19505 points
    Dear James-san

    Thank you for reply.

    On forrowing application note, page3 writing on 10nF, is this a special case?
    http://www.tij.co.jp/jp/lit/an/scea046/scea046.pdf
    (Is 10nF non-recommend?)

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Genius 14485 points

    Satoshi-san,

    I understand your question better now. A capacitor of any size may be placed on the input of this device, because it has a Schmitt trigger on its inputs. The concern with a capacitor on the input of a logic device is that it will cause the transition to happen too slow. When a transition happens too slowly, the output of a regular logic device oscillates and wastes power. The Schmitt trigger allows for a slow transition on this device, so having a capacitor of any size will not be a problem for this device.

    James