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SN74AUP1G97: Input voltage VIL & VIH

Part Number: SN74AUP1G97
Other Parts Discussed in Thread: SN74AUP1G00

Hi,

I checked two datasheet of SN74AUP1Gxx series, one is input with Schmitt-Trigger SN74AUP1G97, another is input of CMOS mode SN74AUP1G00.

I copied the input voltage VIL & VIH spec below, and added a picture taken from one App Note. If Vcc is both powered by 3V, Would like to learn:

1. What are the differences between VT+ and VIH, and VT- and VIL?

2. Only Schmitt-Trigger type input has MIN & MAX value of VIH & VIL, but CMOS type input only has VIL_MAX and VIH_MIN, right?

If yes, what is the reason, why not VIL_MIN and VIH_MAX marked?

3. It seems that "hyst" voltage means "VT+ - VT-" in Schmitt-Trigger input, but what does "hyst" voltage mean in CMOS input?

4. If "hyst" voltage is defined for "VIH - VIL" or "VT+ - VT-", what definition can be used for "VIH_MAX - VIH_MIN", and "VIL_MAX - VIL-MIN"?

Below is a picture from one app note of TI.