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SN74LVC2G17: Different Schmitt thresholds than LVC1G17

Part Number: SN74LVC2G17

Tool/software:

When I read the data sheets the LVC1G17 can switch with a rising 3.04V signal with a 5V supply MAX:(2.74+3.33)/2 = 3.035V, so I could send a 3.3V logic signal to the part and have it switch.

However, the LVC2G17 has MAX specs of 3.1V (4.5V supply) and 3.7V (5.5V supply). So, its threshold is 3.4V with a 5V supply; it might have problems with a 3.3V signal.

I know I can use a LV1T34 part for translation between 3.3V and 5V, but it isn't a schmitt part and has a 20 ns/V spec for the rise time (max).

Is there a reason for the difference in specs between the LVC1G17 and the LVC2G17 besides the fact that the latest datasheets are 2020 vs 2015?

Are they truly different input threshold specs?

  • Hi WST,

    In my personal opinion, the likely reason for the difference is different datasheet writers using different safety margins from the same real value, but as a TI engineer, I cannot recommend operating outside the datasheet limits and must disclaim that TI only guarantees performance within the limits set in the datasheet.

    Best,

    Ian