Intro to Logic Gates & Datasheets. Intro to Logic Gates & Datasheets. Introduction to Integrated Circuits. TTL Vs. CMOS Logic
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1 Intro to Logic Gates & Datasheets Digital Electronics Intro to Logic Gates & Datasheets This presentation will Introduce integrated circuits (ICs). Present an overview of : Transistor-Transistor Logic TTL Complementary Metal Oxide Semiconductor - CMOS Define the scale of integration and package styles. Describe the TTL logic gate numbering system. Review manufacturer datasheets. 2 Introduction to Integrated Circuits All logic gates are available in Integrated Circuits (ICs) ICs are categorized in three different ways: The underlying technology upon which their circuitry is based: Transistor-Transistor Logic - TTL Complementary Metal Oxide Semiconductor - CMOS The scale of integration: Small Scale Integration - SSI Medium Scale Integration - MSI Large Scale Integration - LSI Very Large Scale Integration - VLSI Package Style Through-Hole Technology - THT Dual Inline Packages - DIP Surface-Mount Technology - SMT Small Outline IC - SOIC Plastic Leaded Chip Carrier - PLCC Quad Flat Pack - QFP 3 TTL Vs. CMOS Logic TTL: Transistor-Transistor Logic Constructed from Bipolar Junction Transistors (BJT) Faster than CMOS Not sensitive to damage from electrostatic-discharge Uses more power than CMOS CMOS: Complementary Metal Oxide Semiconductor Constructed from Metal Oxide Semiconductor Field-Effect Transistors (MOSFET) Uses less power than TTL Slower than TTL Very sensitive to damage from electrostatic-discharge BJT Transistor MOSFET Transistor 4 Copyright
2 IC Density of Integration Density of Integration / Complexity SSI: Small-Scale Integration Logic Gates (AND, OR, NAND, NOR) MSI: Medium-Scale Integration Flip Flops Adders / Counters Multiplexers & De-multiplexers LSI: Large-Scale Integration Small Memory Chips Programmable Logic Device VLSI: Very Large-Scale Integration Large Memory Chips Complex Programmable Logic Device ULSI: Ultra Large-Scale Integration 8 & 16 Bit Microprocessors GSI: Giga-Scale Integration Pentium IV Processor Gates per IC < ,000 10, , ,000 1,000,000 >1,000,000 5 Through-Hole Technology (THT) DIP: Dual Inline Package NOTE: For most commercial application, the DIP package has become obsolete. However, it is still the package of choice for educational applications because it can be used with proto-boards. Package Styles Surface Mount Technology (SMT) SOIC: Small Outline IC QFP: Quad Flat Pack PLCC: Plastic Leaded Chip Carrier 6 Through-Hole Technology (THT) THT components have pins that are inserted into holes drilled in the PCB and soldered on the reverse side of the board. Designs with THT components are easier to handassemble than SMT-based designs because THT components are much larger. THT components can be used in proto-boards. Designs with THT components are significantly larger than SMT-based designs. Most high-end electronics components (i.e., microprocessors) are not available in THT package styles. 7 Surface Mount Technology (SMT) SMT components are mounted on the surface of the PCB, so no holes need to be drilled. Primary Advantages: Designs with SMT components are smaller than THTbased designs because SMT components are significantly smaller and have much higher pin counts than THT components. Also, SMT components can be mounted on both sides of the PCB. Primary Disadvantages: Designs with SMT components are more expensive to manufacture because the process is significantly more sophisticated than THT-based designs. SMT components can not be used in a proto-boarding. 8 Copyright
3 TTL Logic Sub-Families TTL Logic Gate Numbering System TTL Series Infix Example Comments Standard TTL none 7404 Low Power L 74L04 Original TTL gates. Slowest, uses a lot of power. (obsolete) Optimized to consume less power than "Standard". (obsolete) Schottky S 74S04 First to utilizes the Schottky transistor. Optimized for speed, but consumes a lot of power. (obsolete) Low-Power Schottky LS 74LS04 Faster and lower power consumption than the L & S subfamilies. The type that is used throughout this course. Advanced Schottky AS 74A S04 Very fast, uses a lot of power. Advanced Low-Power Schottky ALS 74ALS04 Very good speed-power ratio. Quite popular member of this family. 9 DM 74 LS 08 N Package Style (i.e., N=DIP) Logic Function (i.e., 04 = Inverter, 08 = AND Gate, etc.) Logic Sub-family (i.e., LS = Low Power Schottky) 74-Series TTL Manufacturer DM = Fairchild Semiconductor SN = Texas Instruments 10 Manufacturer Datasheets General Description A manufacturer datasheet for a logic gate contains the following information: General Description Connection (pin-out) Diagram Function Table Operating Conditions Electrical Characteristics Switching Characteristics Physical Dimensions Copyright
4 Connection Diagram Function Table Recommended Operating Conditions Electrical Characteristics Copyright
5 Switching Characteristics Physical Dimensions Copyright
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