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Schmitt Trigger Question

M

mbillian

Jan 1, 1970
0
I am interested in having slightly different trigger voltages for a
circuit I'm designing. I've noticed that the 40106 hex inverter and the
74HC14 have different positive and negative going values; both are
greater for the 4000 chip. Is this particular to the 40000 series (same
manufacturer)?

thanks

Mitch
 
T

Tim Wescott

Jan 1, 1970
0
mbillian said:
I am interested in having slightly different trigger voltages for a
circuit I'm designing. I've noticed that the 40106 hex inverter and the
74HC14 have different positive and negative going values; both are
greater for the 4000 chip. Is this particular to the 40000 series (same
manufacturer)?

thanks

Mitch

The threshold voltages for a logic-series schmitt trigger are going to
vary all over the map from part to part and (most likely) over temperature.

If your application is sensitive to slight differences in trigger
voltages then you may want to look to using a comparator & positive
feedback (and watch your supply voltage for it's accuracy).
 
M

mitch

Jan 1, 1970
0
Tim said:
The threshold voltages for a logic-series schmitt trigger are going to
vary all over the map from part to part and (most likely) over
temperature.

If your application is sensitive to slight differences in trigger
voltages then you may want to look to using a comparator & positive
feedback (and watch your supply voltage for it's accuracy).
Thanks for the advice.

Mitch
 
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