Electronic Devices and Amplifier Circuits
Electronic Devices and Amplifier Circuits - Orchard Publications
Electronic Devices and Amplifier Circuits - Orchard Publications
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Chapter 6 Integrated <strong>Circuits</strong>TABLE 6.8 Truth table for 3−input NAND gate with positive logicInputsOutputA B C D0 0 0 10 0 1 10 1 0 10 1 1 11 0 0 11 0 1 11 1 0 11 1 1 0Table 6.8 shows that the output of an NAND gate is logical 0 (false) only when all inputs are logical1 .Figure 6.18 shows the TTL SN7400 Quad 2−input NAND gate where Quad implies that there are4 NAND gates within the IC.1A114Vcc1A1B1Y1B1Y2A2B2Y2313124B4A411 4Y5 10 3B69 3A2A2B3A3B2Y3YGND783Y4A4B4YFigure 6.18. The SN7400 Quad 2−input NAND gateFigure 6.19 shows the internal details of the IC SN7400 NAND gate where transistor T 1 is equivalentto two identical NPN transistors with their bases <strong>and</strong> collectors tied together; therefore, theyare fabricated as a single device with 2 emitters but only one collector <strong>and</strong> one base as shown inFigure 6.19.6−10 <strong>Electronic</strong> <strong>Devices</strong> <strong>and</strong> <strong>Amplifier</strong> <strong>Circuits</strong> with MATLAB® / Simulink® / Sim<strong>Electronic</strong>s® Examples, Third EditionCopyright © Orchard Publications
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