Shift Registers » Exercise – 2
51. Another way to connect devices to a shared data bus is to use a ________.
(a) circulating gate
(b) transceiver
(c) bidirectional encoder
(d) strobed latch
52. The primary purpose of a three-state buffer is usually:
(a) to provide isolation between the input device and the data bus
(b) to provide the sink or source current required by any device connected to its output without loading down the output device
(c) temporary data storage
(d) to control data flow
53. Stepper motors have become popular in digital automation systems because ________.
(a) of their low cost
(b) they are driven by sequential digital signals
(c) they can be used to provide repetitive mechanical movement
(d) they are driven by sequential digital signals and can be used to provide repetitive mechanical movement
54. What does the output enable do on the 74395A chip?
(a) It determines when data can be loaded.
(b) It forces all outputs to go HIGH.
(c) It forces all outputs to go LOW.
(d) It activates the three-state buffer.
55. When is it important to use a three-state buffer?
(a) when two or more outputs are connected to the same input
(b) when all outputs are normally HIGH
(c) when all outputs are normally LOW
(d) when two or more outputs are connected to two or more inputs
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