74LS00 (or 7400) IC – NAND Gate – Quad – 2 Input

The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS00 is Quad 2-Input NAND Gate IC that contains four independent, 2-input NAND gates. 74LS00 perform the Boolean functions (AND Function) Y = A .B or (OR Function)Y = A + B in positive logic.Four Independent NAND Gates
Standard Pin Configuration
Also Available in SMD Type
Operating Temperature to 70°C
Standard TTL Switching Voltages
74LS00 Specifications
Supply Voltage 4.75 – 5.25Vdc
Maximum Clock Frequency 40Mhz
Power Dissipation 2mW/gate @100kHz
Minimum Output Current 8mA
Propagation Delay 10nS
Fan Out (TTL Loads) 20
74LS00 Pinout Diagram

74LS00 Pin Description
Pin No Pin Name Description
1 A1 NAND Gate 1 Input 1
2 B1 NAND Gate 1 Input 2
3 C1 NAND Gate 1 Output
4 A2 NAND Gate 2 Input 2
5 B2 NAND Gate 2 Input 2
6 C2 NAND Gate 2 Output
7 GND Ground
8 C4 NAND Gate 4 Output 4
9 A4 NAND Gate 4 Input 2
10 B4 NAND Gate 4 Input 2
11 C3 NAND Gate 3 Output
12 A3 NAND Gate 3 Input 2
13 B3 NAND Gate 3 Input 2
14 VCC Positive Supply

74LS00 Circuit
Below is a simple circuit of NAND gate with two inputs B1 & B2 and one LED is connected at the output to verify the results of logic ic.