Hex Schmitt-Trigger Inverters- CD40106
The CD40106 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).
• Wave and Pulse Shapers • High-Noise-Environment Systems • Monostable Multivibrators • Astable Multivibrators
Description above from Texas Instruments, see data sheet for more information - http://www.ti.com/lit/ds/symlink/cd40106b.pdf