• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 19 subscribers
  • Views 199 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CD74HC4050: Hysterisis

Sudarshan Bhat
Prodigy 20 points
Part Number: CD74HC4050

Does this IC provide Hysterisis?

The datasheet says turn On or VOH at around 3.15V for 5V VCC and VOL at 1.35V. So Technically there is hysteresis.

But when tested, both VOH and VOL are at VIH=VIL=2.2V. Can you clarify this?


  • 0
    Guru 298860 points

    This is not what these specifications mean.

    For any voltage at VIL or lower, the output is guaranteed to be low. For any voltage at VIH or higher, the output is guaranteed to be high.

    For any voltage between VIL and VIH, there is no guarantee. There might be a single switching threshold somewhere between VIL and VIH, or there might be some hysteresis with both thresholds being somewhere between VIL and VIH.

  • +1
    TI__Mastermind 21660 points

    Hi Sudarshan,

    The switching often occurs at a single point that's usually around 50% VCC. However, this value varies due to process and manufacturing and TI cannot guarantee operation strictly at a single value for any VCC.

    What we do guarantee is that the device will switch low when the input is set below the VIL threshold and high when it is set above the VIH threshold. 

    Best,

    Malcolm