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Transistor-Transistor Logic (TTL) Lecture L4.1
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Transistor-Transistor Logic (TTL) Developed in mid-1960s Large family (74xx) of chips from basic gates to arithmetic logic units Becoming obsolete with the development of programmable logic devices (PLDs)
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TTL Chips
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TTL NAND, NOR, XOR
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TTL Multiple-input Gates
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Small-Scale Integrated (SSI) Circuits 1 to 10 gates NAND gate has 4 transistors
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Medium-Scale Integrated (MSI) Circuits 10-100 gates Adders Comparators Multiplexers Decoders
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Large-Scale Integrated (LSI) Circuits 100-1000 gates Arithmetic Logic Units
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Very-Large-Scale Integrated (VLSI) Circuits >1000 gates Microprocessors Programmable Logic Devices (PLDs) Complex Programmable Logic Devices (CPLDs) Field Programmable Gate Arrays (FPGAs)
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