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viralvaghela
Visitor II
November 21, 2023
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VIL Level of M74HC14YTTR IC

Hello, 

What is the VIL(Low Level Input) voltage of the IC M74HC14YTTR provided VCC voltage 3.3V?
The datasheet specifies the VCC voltage levels of 2.0V, 4.5V, 6.0V. We have used the VCC as 3.3V. 

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Peter BENSCH
Peter BENSCHBest answer
ST Technical Moderator
November 21, 2023

Welcome @viralvaghela, to the community!

Logic gates like the M74HC14YTTR are tested at typical supply voltages that were common at the time the data sheet was created (here 2001). Unfortunately, the limits of VIL in particular deviate more strongly at VCC < 4.5V, so that no official statement can be made. However, if you use the values of VCC = 4.5V for VIL, you should be on the safe side for logic applications.

If you need exact switching thresholds, you should rather use a comparator with a predictable and exact reference voltage.

Hope that helps?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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1 reply

Peter BENSCH
Peter BENSCHBest answer
ST Technical Moderator
November 21, 2023

Welcome @viralvaghela, to the community!

Logic gates like the M74HC14YTTR are tested at typical supply voltages that were common at the time the data sheet was created (here 2001). Unfortunately, the limits of VIL in particular deviate more strongly at VCC < 4.5V, so that no official statement can be made. However, if you use the values of VCC = 4.5V for VIL, you should be on the safe side for logic applications.

If you need exact switching thresholds, you should rather use a comparator with a predictable and exact reference voltage.

Hope that helps?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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