Unit 1 Key Terms

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Across
  1. 3. Very common IC package
  2. 5. a movement of electrical charges around a closed path
  3. 6. 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
  4. 9. The algebraic sum of all voltages around any closed path must equal zero.
  5. 14. Metallic alloy of tin and lead that is used to join two metal surfaces.
  6. 15. printed and detailed specification
  7. 17. a voltage or current that can have any value within a defined range
  8. 18. Abbreviation of System International, a system of practical units based on the meter, kilogram, second, ampere, Kelvin, mole, and candela.
  9. 20. used to store electrical charge
  10. 21. 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.
  11. 23. The higher of two voltages in a digital system with two logic levels
  12. 26. board containing conductive tracks for circuit connections
  13. 30. a way of representing a physical quantity
  14. 31. 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.
  15. 32. The unwanted formation of a conductive path of solder between conductors.
  16. 33. digital circuit that implements the AND operation
  17. 34. Term derived from "transfer resistor." Semiconductor device that can be used as an amplifier or as an electronic switch.
  18. 36. digital circuitry
  19. 37. One that has two or more branches for separate current from one voltage source
  20. 38. An IC that contains circuitry equivalent to more than 11 and less than 100 gates
  21. 40. The algebraic sum of all currents into and out of any branch point in a circuit must equal zero
  22. 42. A list of all possible input values to a digital circuit, listed in ascending binary order, and the output response for each input combination.
  23. 46. Coding system of colored stripes on a resistor to indicate the resistor's value and tolerance.
  24. 47. to current. Unit is the ohm.
  25. 48. Tool with an internal heating element used to heat surfaces being soldered to the point where the solder becomes molten
  26. 49. 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.
Down
  1. 1. the direction of current flow
  2. 2. A square IC package with leads on all four sides designed for surface mounting on a circuit board.
  3. 4. square wave
  4. 6. An integrated circuit having 12 or fewer gates in one package.
  5. 7. test equipment used to measure voltage
  6. 8. a series of logic
  7. 10. In electric circuits, I=V/R.
  8. 11. A family of digital logic devices whose basic element is the bipolar junction transistor.
  9. 12. An electronic device that conducts current in one direction only and illuminates when it is conducting
  10. 13. An IC package similar to a DIP, but smaller, which is designed for automatic placement and soldering on the surface of a circuit board.
  11. 16. An electronic circuit that performs a Boolean algebraic function
  12. 19. of resistance. Value of one ohm allow current of one ampere with potential difference of one volt.
  13. 22. The lower of two voltages in a digital system with two logic levels.
  14. 24. circuit board for wiring temporary circuits
  15. 25. 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. 27. A floating point system in which numbers are expressed as products
  17. 28. a series of events that are regularly repeated
  18. 29. An IC that contains circuitry equivalent to 100 gates or more
  19. 31. One that has only one path current.
  20. 35. Numbers entered as a number from one to ten multiplied by a power of ten
  21. 39. 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.
  22. 41. a protective device that melts current exceeds
  23. 43. Also called an INVERTER gate or an inverting buffer. A logic gate that changes its input logic level to the opposite state.
  24. 44. To switch from one effect, feature, or state to another.
  25. 45. Process of joining two metallic surfaces to make an electrical contact by melting solder (usually tin and lead) across them\