The 7400 is the first of a series of logical TTL devices and is the perfect example of a basic, yet commonly applied, integrated circuit. Within this discrete component is contained 4 independently functional 2-input NAND gates. Pins 14 and 7 provide power to all of the four gates and the internal connections are omitted for added clarity, as is often the case in digital electronics. Once power is applied to the main inputs of the chip, each gate begins to perform it's primary function, which is to calculate the NAND function on two input lines. For example, consider the "first" gate inside the chip (wired to pins one, two, and three). Pins one and two are the gate's input lines. Pin three is the output. The output will only "activate" (or go low) when both inputs, one and two, are logical high. All other combinations of highs and lows (ones and zer
Thursday, March 26, 2009
7400 Quad Nand Gate
The 7400 is the first of a series of logical TTL devices and is the perfect example of a basic, yet commonly applied, integrated circuit. Within this discrete component is contained 4 independently functional 2-input NAND gates. Pins 14 and 7 provide power to all of the four gates and the internal connections are omitted for added clarity, as is often the case in digital electronics. Once power is applied to the main inputs of the chip, each gate begins to perform it's primary function, which is to calculate the NAND function on two input lines. For example, consider the "first" gate inside the chip (wired to pins one, two, and three). Pins one and two are the gate's input lines. Pin three is the output. The output will only "activate" (or go low) when both inputs, one and two, are logical high. All other combinations of highs and lows (ones and zer
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