Pin 1 will be used as the input pin for the first inverter. VCC Pin 14 Pin 14 will use as the power pin. It will use to provide the power to the IC, to make it functional. Its speed is much faster than a simple transistor-based inverter. It comes totally lead-free. A whole 74LS04 can be used for only one inverter without effecting the other inverter.
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Here are few cases where 74LS04 is used. The chip is basically used where a logic inverter is needed. Inverter Gates in this chip provide output which is negated logic input. The chip has six gates which do NOT operation. When you want TTL outputs. The gates in this chip provide TTL logic outputs which are a must in some applications. The internal connection of gates can be given as below. Now let us take a single gate of the six and connect it as shown in circuit diagram.
As shown in diagram, we have a transistor forming a NOT gate. Input here is 1A which is connected to button. Output 1Y is connected to LED through a resistor. The LED is connected to know the output status. In the circuit, When button is not pressed: Current through base of transistor will be zero. Because base current is zero the transistor will be in OFF state. Under OFF sate the total supply voltage appears across the transistor.
Under such case the output 1Y here will be HIGH, since output is nothing but voltage across transistor. When button is pressed: Voltage appears at base of transistor and current flows through it. Because base current is present the transistor will turn ON. Under ON sate the total supply voltage appears across the resistor and voltage across transistor will be zero. Under such case the output 1Y here will also be LOW, since output is nothing but voltage across transistor.
If we draw truth table based on above cases, we will have. Input 1A.
IC 7404 Pin Diagram, Circuit Design, Data sheet, application
74LS04 Datasheet and Pinout – Hex Inverter Gates Logic IC