Chapter3_new - EE2006 Digital Design/S Ranganath III...

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EE2006 Digital Design/S Ranganath III- 1 III. Digital Logic Signal and Device Notations Transistor-transistor Logic (TTL) Parts. Signal Naming Conventions. The Positive Logic Convention and Logic Gate Representations. SSI Basic Gate Summary. Interpreting Signals in Digital Circuit Diagrams. Digital devices are manufactured under various technologies such as TTL, CMOS, NMOS, etc. Small scale integrated (SSI) circuit chips contain less than 12 gates and are commonly available as TTL parts. MSI chips contain between 13 and 99 gates, LSI between 100 and 1000, and VLSI more than 1000. These chips are available in various families.
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EE2006 Digital Design/S Ranganath III- 2 Transistor-transistor logic (TTL) parts The TTL family includes many different series such as Standard TTL High speed H-TTL Low Power L-TTL Schottky S-TTL Low power Schottky LS-TTL Advanced Schottky AS-TTL Advanced LS ALS-TTL Chip identifiers: 74 X Y commercial grade series in part # product TTL family Functionally, 7400, 74LS00, 74ALS00 are all 2-input NAND gates, and are logically the same.
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