Transistor-Transistor Logic (TTL) Lecture L4.1. Transistor-Transistor Logic (TTL) Developed in mid-1960s Large family (74xx) of chips from basic gates.

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Presentation transcript:

Transistor-Transistor Logic (TTL) Lecture L4.1

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)

TTL Chips

TTL NAND, NOR, XOR

TTL Multiple-input Gates

Small-Scale Integrated (SSI) Circuits 1 to 10 gates NAND gate has 4 transistors

Medium-Scale Integrated (MSI) Circuits gates Adders Comparators Multiplexers Decoders

Large-Scale Integrated (LSI) Circuits gates Arithmetic Logic Units

Very-Large-Scale Integrated (VLSI) Circuits >1000 gates Microprocessors Programmable Logic Devices (PLDs) Complex Programmable Logic Devices (CPLDs) Field Programmable Gate Arrays (FPGAs)