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Schmitt Trigger SN74HC132DR

Genius 3475 points
Other Parts Discussed in Thread: SN74HC132

HI

Like to check on Schmitt trigger device SN74HC132

On the data sheet, the VT+ and VT- has Max and Min value that are overlapping. Example 

If “VT+ (min)” < “VT-(max)”, it will make “VT+ - VT-“ negative.

How is the VT+ - VT  min and max value derived? It does not appear to be the min of VT+ minus max of Vt- ?

What is the test condition of this test?

Ivan