CD4093 Quad 2-Input NAND Schmitt Trigger

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CD4093 belongs to the CD4000 IC series. CD4093 IC is composed of four Schmitt trigger circuits, each of which functions as a 2 – input NAND logic gate. The gate switches at different points for positive and negative-going signals. The difference between the positive (VT+) and the negative voltage(VT−) is defined as hysteresis voltage (VH). The IC offers features such as ESD protection, low thermal dissipation, and input diode clamps (in order to protect the input pins from damage caused by any static discharge).

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NAND Gate

A NAND Gate is a logic gate that is a combination of AND and NOT gates. A NAND gate is also known as a universal gate in Boolean algebra. The output of the NAND gate is always yielding logic 1 and only yields logic 0 when all the inputs to the NAND gate are at logic 1.

Schmitt Trigger

A Schmitt Trigger is a comparator based circuit that gives the output on the basis of the previous gate output. In a Schmitt Trigger, the input value can be analog or digital but the output will be in two forms 1 or 0. Any circuit is convertible to Schmitt trigger by applying a positive feedback system. In a Schmitt Trigger circuit, the threshold is being used to get output. When the value is higher than the threshold the output will be HIGH otherwise it will be considered in the LOW state.

CD4093 Key Features

Wide supply voltage range: 3.0V to 15V
Schmitt-trigger on each input
- with no external components
Noise immunity greater than 50%
Equal source and sink currents
No limit on input rise and fall time
Standard B-series output drive

CD4093 Pinout

Pin No	Pin Name	Description
1	A	Input 1 of NAND gate 1
2	B	Input 2 of NAND gate 1
3	Q0	Output of NAND gate 1
4	Q1	Output of NAND gate 2
5	C	Input 1 of NAND gate 2
6	D	Input 2 of NAND gate 2
7	VSS	Source Supply
8	E	Input 1 of NAND gate 3
9	F	Input 2 of NAND gate 3
10	Q2	Output of NAND gate 3
11	Q3	Output of NAND gate 4
12	G	Input 1 of NAND gate 4
13	H	Input 2 of NAND gate 4
14	VDD	Drain Supply