ITM 207 Ch 4.docx

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Department
Information Technology Management
Course
ITM 207
Professor
Jim Tam
Semester
Winter

Description
Chapter 4 Gate- A device that performs a basic operation on electrical signals, accepting one or more input signals and producing a single output signal Circuits: A combination of interacting gates designed to accomplish a specific logical function Boolean algebra: A mathematical notation for expressing two-valued logical function Logic diagram: A graphical representation of a circuit; each type of gate has its own symbol Truth table: A table showing all possible input values and the associated output values Six types of gates NOT AND OR XOR NAND NOR typically, logic diagrams are black and white with gates distinguished only by their shape NOT gate- accepts one input signal (0 or 1) and returns the opposite signal as output AND gate- accepts 2 input signals, If both are 1, the output is 1; otherwise, the output is 0 OR gate -accepts two input signals, If both are 0, the output is 0; otherwise, the output is 1 XOR gate- accepts two input signals, If both are the same, the output is 0; otherwise, the output is 1 NAND gate -accepts two input signals, If both are 1, the output is 0; otherwise, the output is 1 NOR gate- accepts two input signals, If both are 0, the output is 1; otherwise, the output is 0 A NOT gate inverts its single input value An AND gate produces 1 if both input values are 1 An OR gate produces 0 if both input values are 0 otherwise there all 1 An XOR gate produces 0 if input values are the same, or produces 1 if one or the other inputs are 1 A NAND gate produces 0 if both inputs are 1 (opposite results of a AND gate) A NOR gate produces a 1 if both inputs are 0 (opposite results of a OR gate) Gates can be designed to accept three or more input values Transistor : A device that acts either as a wire that conducts electricity or as a resistor that blocks the flow of electricity, depending on the voltage level of an input signal. A transistor has no moving parts, yet acts like a switch Semiconductor: ex. Silicon, This is neither a good conductor of electricity nor a good insulator Constructing Gates A transistor has three terminals -A source -A base -An emitter, typically connected to a ground wire If the electrical signal is grounded; it is allowed to flow through an alternative route to the ground (literally) where it ca
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