• State TI Thinks Resolved
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 19 subscribers
  • Views 33 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

SN74AHCT1G86: Input threshold max. min. levels

DENIZ GULER
Prodigy 10 points
Part Number: SN74AHCT1G86

Tool/software:

Hello,

I'd like to use this part as an oscillator but need to know all threshold levels to see the frequency accuracy. Could you please provide all input threshold levels?

Thank you

Deniz Guler

  • 0
    Guru 284570 points

    You must not use this device with slow input edges; see the t/v limit in section 5.3. Only a device with Schmitt-trigger inputs would work with slow edges.

    For logic devices, the thresholds are not very well specified. If you care about accuracy, you have to use a comparator instead.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Thank you, it is fast enough for my application. I'm looking for cost effective solutions and if the device's threshold range can be specified that greatly helps. 

  • 0 in reply to DENIZ GULER
    TI__Expert 8951 points

    As Clemens said Logic devices thresholds are not specified during oscillations and the actual value of a threshold can shift between lots, or device updates without needing to change the value in the datasheet.

    That being said this devices input thresholds are found in the recommended operating conditions section.

    The actual value will be slightly lower than 2V and slightly above 0.8V, but these are the values that guarantee a transition on this device.

    What was highlighted above is the output voltage levels and those values are dependent on system conditions.

    Regards,

    Owen