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The CD40106 is an integrated circuit made by Texas Instruments for the following applications.

  • Wave and Pulse Shapers
  • High-Noise-Environment Systems
  • Monostable Multivibrators
  • Astable Multivibrators

From the CD40106 data sheet#

“The CD40106B device consists of six Schmitt-Trigger inputs. Each circuit functions as an inverter with Schmitt-Trigger input. The trigger switches at different points for positive- and negative-going signals. The difference between the positive-going voltage (VP) and the negative-going voltages (VN) is defined as hysteresis voltage (VH).”