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Digital ElectronicsShift Registers

A 16-bit shift register is clocked at 2 MHz. Ignoring loading overhead, how long does it take to shift 16 serial bits through 16 clock periods?

  • A1 microsecond
  • B4 microseconds
  • C8 microseconds
  • D16 microseconds
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Correct Answer: C. 8 microseconds
Explanation: At 2 MHz, one clock period is 0.5 microsecond. Sixteen clock periods therefore require 16 × 0.5 = 8 microseconds.
Reference: Standard digital electronics: serial shifting
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