The 4093 is a CMOS chip with four NAND gates with a Schmitt trigger. Because each gate has two inputs and has four gates inside, it’s often referred to as a Quad 2-Input NAND Schmitt Trigger.
A NAND gate with a Schmitt trigger works more or less like a normal NAND gate. With the exception that the threshold for when it switches from LOW to HIGH is different from when it switches from HIGH to LOW.
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