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Schmitt-trigger inverter with V_T+ (rising) max of <= 1.8V with VCC = 5.5V?

Jonathan Bender
Expert 7895 points
Other Parts Discussed in Thread: SN74AHCT1G14

Hello,

Do we have a Schmitt-trigger inverter with a max positive-going input threshold voltage of <= 1.8V when VCC = 5.5?

Closest I can find is SN74AHCT1G14, which is 2.0V.

Thanks,

Jonathan

  • 0
    TI__Guru 62050 points

    Hi Jonathan ,

    I would assume no , since Vt+ of 2V will be considered as Vih for the part and requiring to switch below max of 1.8V for 5.5V Vcc will be bit of stretch . The hysteresis of the switch will become narrower with lower Vt+ and higher Vt- too . I can search a few and see how the Vt+ behaves and will let you know .

  • 0 in reply to ShreyasRao
    TI__Guru 62050 points
    The LVC and AHC family has higher Vt and they are the only ones which are 5.5V and single gate . There are CD74HCT types which are similar to AHCT and they have Vt+ of 2.1V listed at 6V . They might transition before 1.8V but just that the datasheet accounts for all the variations of process , temp measurement corners .
  • 0 in reply to ShreyasRao
    TI__Expert 7895 points

    Hi Shreyas,


    Thanks for digging into this for me - I appreciate the informed confirmation.

    Jonathan