Unit 1 Key Terms

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Across
  1. 1. In-Line Package (DIP)/ 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.
  2. 3. Law/ In electric circuits, I=V/R.
  3. 4. 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.
  4. 6. Outline IC (SOIC)/ An IC package similar to a DIP, but smaller, which is designed for automatic placement and soldering on the surface of a circuit board.
  5. 10. Circuit/ One that has two or more branches for separate current from one voltage source.
  6. 13. /Digital signal in the form of a rectangular pulse train or a square wave.
  7. 14. 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.
  8. 15. Metallic alloy of tin and lead that is used to join two metal surfaces.
  9. 16. Logic/ Digital circuitry in which an output is derived from the combination of inputs, independent of the order in which they are applied.
  10. 18. Opposition to current. Unit is the ohm.
  11. 20. A movement of electrical charges around a closed path or circuit.
  12. 22. Notation/ Numbers entered as a number from one to ten multiplied by a power of ten.
  13. 25. Multi-Meter(DMM)/ A piece of test equipment used to measure voltage, current, and resistance in an electronic circuit.
  14. 26. Term derived from "transfer resistor." Semiconductor device that can be used as an amplifier or as an electronic switch.
  15. 28. 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.
  16. 30. Scale Integration (LSI)/ An IC that contains circuitry equivalent to 100 gates or more.
  17. 31. Process of joining two metallic surfaces to make an electrical contact by melting solder (usually tin and lead) across them.
  18. 33. Gate/ Also called an INVERTER gate or an inverting buffer. A logic gate that changes its input logic level to the opposite state.
  19. 34. Current / The direction of current flow associated with positive charge in motion. The current flow direction is from a positive to negative potential, which is in the opposite direction of electron flow.
  20. 37. To switch from one effect, feature, or state to another.
  21. 38. Iron / Tool with an internal heating element used to heat surfaces being soldered to the point where the solder becomes molten.
  22. 40. / A series of events that are regularly repeated in the same order.
  23. 42. Circuit/ One that has only one path current.
  24. 43. Light-emitting diode. An electronic device that conducts current in one direction only and illuminates when it is conducting.
  25. 44. Waveform / A series of logic 1s and 0s plotted as a function of time.
  26. 45. / A protective device in the current path that melts or breaks when current exceeds a predetermined maximum value.
Down
  1. 2. LOW/ The lower of two voltages in a digital system with two logic levels.
  2. 5. (TTL)/ A family of digital logic devices whose basic element is the bipolar junction transistor.
  3. 6. The unwanted formation of a conductive path of solder between conductors.
  4. 7. An electrical device used to store electrical charge.
  5. 8. Leaded Chip Carrier (PLCC)/ A square IC package with leads on all four sides designed for surface mounting on a circuit board.
  6. 9. A way of representing some physical quantity, such as temperature or velocity, by a proportional continuous voltage or current. An analog voltage or current can have any value within a defined range.
  7. 11. Gate/ Digital circuit that implements the AND operation. The output of this circuit is HIGH only if all of its inputs are HIGH.
  8. 12. circuit board for wiring temporary circuits, usually used for prototypes or laboratory work.
  9. 17. Unit of resistance. Value of one ohm allow current of one ampere with potential difference of one volt.
  10. 19. 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.
  11. 21. Circuit Board/ Insulating board containing conductive tracks for circuit connections.
  12. 22. Notation/ Abbreviation of System International, a system of practical units based on the meter, kilogram, second, ampere, Kelvin, mole, and candela.
  13. 23. Voltage Law (KVL)/ The algebraic sum of all voltages around any closed path must equal zero.
  14. 24. 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.
  15. 27. Color Code/ Coding system of colored stripes on a resistor to indicate the resistor's value and tolerance.
  16. 29. 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
  17. 31. Integration (SSI)/ An integrated circuit having 12 or fewer gates in one package.
  18. 32. / A printed specification giving details of the pin configuration, electrical properties, and mechanical profile of an electronic device.
  19. 35. Notation / A floating point system in which numbers are expressed as products consisting of a number greater than one multiplied by an appropriate power of ten that is some multiple of three.
  20. 36. 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.
  21. 39. / A way of representing a physical quantity by a series of binary numbers. A digital representation can have only specific discrete values.
  22. 41. Scale Integration (MSI)/ An IC that contains circuitry equivalent to more than 11 and less than 100 gates.