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Lesson 1.2
Introduction to Circuit Design
Term | Definition |
---|---|
AND Gate | Digital circuit that implements AND operation. The output of this circuit is HIGH only if all of it's inputs are high. |
Capacitor | An electrical device used to store electrical charge. |
Clock | Digital signal in the form of a rectangular pulse train or a square wave. |
Combinational Logic | Digital circuitry in which an output is derived from the combination of inputs, independent if the order in which they are applied. |
Cycle | A series of events that are regularly repeated in the same color. |
Datasheet | A printed specification giving details of the pin configuration, electrical properties, and mechanical profile of an electronic device. |
Digital Waveform | A series of logic 1's and 0's plotted as a function of time. |
Dual In-Line Package | A very common IC package with two parallel rows of pins intended to be inserted into a socket of through holes drilled in a printed circuit board. |
Fuse | A protective device in the current path that melts or breaks when current exceeds a predetermined maximum value. |
Large Scale Integration (LSI) | An IC that contains circuitry equivalent to to 100 gates or more. |
Logic Gate | An electronic circuit that performs a Boolean algebraic function. |
Logic HIGH | The higher of two coltages in digital system with two logic levels. |
Logic Low | The lower of two voltages in a digital system with two logic levels. |
Medium Scale Integration (MSI) | An IC that contains circuitry equivalent to more than 11 and less than 100. |
NOT Gate | Also called an INVERTER gate or an inverting buffer. A logic gate that changes its input logic level to the opposite state. |
OR Gate | Digital circuit that implements the OR operation. The output of this circuit is HIGH (logic level 1) if any or all of its inputs are HIGH. |
Plastic Leaded Chip Carrier (PLCC) | A square IC package with leads on all four sides designed for surface mounting on a circuit board. |
Printed Circuit Board | Insulating board containing conductive tracks for circuit connections. |
Schottky TTL | TTL subfamily that uses the basic TTL standard circuit except that it uses a Schottky barrier code (SBD) connected between the base and the collector of each transistor for faster switching. |
Seven-Segment Display | An array of seven independently controlled light-emitting diodes (LED) or liquid crystal display (LCD) elements, shaped like a figure-8, which can be used to display decimal digits and other characters by turning on the appropriate elements. |
Sequential Logic | Digital circuitry in which the output state of the circuit depends not only on the states of the inputs, but also on the sequence in which they reached their present states. |
Testing design function by specifying a set of inputs and observing the resultant outputs. Simulation is generally shown as a series of input and output waveforms. | Testing design function by specifying a set of inputs and observing the resultant outputs. Simulation is generally shown as a series of input and output wave forms. |
An IC package similar to a DIP, but smaller, which is designed for automatic placement and soldering on the surface of a circuit board. | An IC package similar to a DIP, but smaller, which is designed for automatic placement and soldering on the surface of a circuit board. |
Small-Scale Integration (SSI) | An integrated circuit having 12 or fewer gates in one package. |
Solder Bridge | The unwanted formation of conductive path of solder between conductors. |
Tinning | The process of applying a thin coat of solder to materials prior to their being soldered; for example, application of a light coat of solder to the filaments of a conductor to hold the filaments in place prior to soldering the conductor. |
Toggle | To switch from one effect, feature, or state to another. |
Transistor | Term derived from "transfer resistor." Semiconductor device that can be used as an amplifier or as an electronic switch. |
Transistor-Transistor (TTL) | A family of digital logic devices whose basic element is the bipolar junction transistor. |
Truth Table | A list of all possible input values to a digital circuit, listed in ascending binary order, and the output response for each input combination. |