7420 IC Dual 4-Input NAND Gate

Description

7420 IC Dual 4-Input
NAND Gate

The 7420 is a monolithic integrated circuit that provides two independent 4-input Positive-NAND gates. Each gate performs the fundamental NAND logic function, where the output is low only when all four inputs are high; if any input is low, the output becomes high. This device serves as a fundamental building block for constructing more complex digital logic circuits, providing a versatile and widely used logic function in a single package.

As part of the standard 7400 series of TTL (Transistor-Transistor Logic) integrated circuits, the 7420 is designed for use in digital systems where multiple input conditions must be gated together. The availability of two separate gates on one chip allows for efficient use of board space and simplifies circuit design. Its primary role is to perform logical operations and implement combinatorial logic, forming the foundation for decoders, encoders, and other control logic functions.

The
7420
is designed for reliable operation within standard digital system parameters. It interfaces seamlessly with other members of the 74xx logic family. In practice, these gates are used to create wider AND functions (by inverting the NAND output) or to implement complex logic expressions in sum-of-products form. The device’s characteristics make it suitable for a wide range of digital applications, from simple logic puzzles to complex computational circuits.

Features:

Contains Two Independent 4-Input NAND Gates.

Dependable Texas Instruments Quality and Reliability.

Package Options Include Plastic “Small Outline” Packages, Ceramic Chip Carriers and Flat Packages, and Plastic and Ceramic DIPs.

Positive NAND Logic.

Standard TTL Switching Voltages.

Fully Compatible with Most TTL Systems.

Specifications:

Parameter

Specification

Function:

Dual 4-Input Positive-NAND Gate

Number of Circuits:

2

Supply Voltage (Vcc):

4.75V to 5.25V (SN7420)

High-Level Input Voltage (VIH):

2V Min

Low-Level Input Voltage (VIL):

0.8V Max

Propagation Delay (tPHL/tPLH):

10 ns / 9 ns (typ for SN74LS20)

Operating Temperature:

0°C to 70°C (SN7420)

Logic Family:

TTL (Standard, LS, S variants available)

Package:

14-Pin PDIP

Applications:

General Purpose Logic Circuits.

Decoders.

Address Decoders.

Control Logic.

Implementing Complex Boolean Functions.

Package Contents:

1x
7420 IC Dual 4-Input NAND Gate

Datasheet