The 7408 IC package contains four independent positive logic AND GATES. Pins 14 and 7 provide power for all four logic gates. The Open-Collector outputs require pull-up resistors for proper logical operation. The OPEN-COLLECTOR outputs can be wired together to produce AND gates with more inputs without the need for additional logic gates.
[AND SIMULATION]       [AND TRUTH-TABLE]
	The circuit on the left shows how the gates of the 7409 can be wired together to act as a larger gate. In the circuit the LED will only glow if all inputs (A,B,C, and D) are high, acting like a 4-input AND gate. Use caution when wiring chip and be sure to check which pins are outputs and inputs! AND GATE Logic-Rules: The output is HIGH when both inputs are HIGH, otherwise output is LOW.