74HCT20 Dual 4-Input NAND Gate
The CD74HCT20M is a high speed CMOS Logic dual 4-input NAND Gate. The logic gates utilize silicon gate CMOS technology to achieve operating speeds similar to LSTTL gates with thelow power consumptionof standard CMOS integrated circuits. It is commonly used in buffer circuits, logic inverter circuits etc.
Pin Description of 74HCT20:
Pin Number |
Pin Name |
Description |
6 |
NAND Gate Output pin (1) |
Output pin of NAND Gate - 1 |
1,2,4,5 |
NAND Gate Input pin (1) |
Four Input pins of NAND Gate -1 |
7 |
地面 |
Connect to the ground of the circuit. |
9,10,12,13 |
NAND Gate Input pin (2) |
四个与非门的输入插脚2 |
8 |
NAND Gate Output pin (2) |
Output pin of NAND Gate - 2 |
14 |
Vcc (Vdd) |
Used to power the IC. Typically +5V is used |
Features of 74HCT20:
- Four Input OR Gate – Dual Package
- Typical Operating Voltage: 5V
- Power Dissipation: 500mW
- Propagation Delay @5V: 8ns (maximum)
- Available in 14-pin PDIP, GDIP, PDSO packages
Note:Complete Technical Details can be found at the74HCT20 datasheetgive at the end of this page.
Equivalent for 74HCT20:CD4012, 74S140, 74HC20
Other Logic Gates:74LS00,74 ls08,74LS02,74LS04,74HCT04
How to use 74HCT20:
The74HCT20isadual 4-Input NAND gate IC from theLogic Gatefamily ICs. It can take in four logic inputs and provide an output based on theNAND Gate truth table. Inputs include clampdiodes. This enables the use of current limitingresistorsto interface inputs to voltages in excess of VCC. NAND gate is commonly used in buffer circuits and logic inverter circuits for digital communication. Both 74HCT20 and74HC20are very similar to each other by pinout and features.
4-Input NAND Gate Truth Table:
| Input A | Input B | Input C | Input D | Output Y |
| 0 | 0 | 0 | 0 | 1 |
| 0 | 0 | 0 | 1 | 1 |
| 0 | 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 1 | 1 |
| 0 | 1 | 0 | 0 | 1 |
| 0 | 1 | 0 | 1 | 1 |
| 0 | 1 | 1 | 0 | 1 |
| 0 | 1 | 1 | 1 | 1 |
| 1 | 0 | 0 | 0 | 1 |
| 1 | 0 | 0 | 1 | 1 |
| 1 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 1 | 1 |
| 1 | 1 | 0 | 0 | 1 |
| 1 | 1 | 0 | 1 | 1 |
| 1 | 1 | 1 | 0 | 1 |
| 1 | 1 | 1 | 1 | 0 |
To use the 74HCT20 IC, just power it using the Vcc and ground lines. The typical operating voltage of the IC is +5V. The output voltage of the IC on the pin Y will be equal to the operating voltage of the IC. As per theNAND Gate 4 input truth tableshown above, when either one or both the input of the Gate is high the output will be high. Internal circuit diagram of 74HCT20 is given below:
Applications of NAND Gate:
- Logic Buffer circuit
- Basic Logic Circuits
- Encoders and Decoders
- Multiplexers and De-multiplexers
- 振荡器电路
- Networking and Digital Systems
2D-Model of 74HCT20:
