Question

An 8-bit serial in/serial out shift register is used with a clock frequency of 2 MHz to achieve a time delay (td) of ________

(a) 16 us

(b) 8 us

(c) 4 us

(d) 2 us

This question was posed to me by my college director while I was bunking the class.

The origin of the question is Shift Registers in chapter Registers of Digital Circuits

Answer 1

Right choice is (c) 4 us

Easiest explanation: One clock period is = (^1⁄2) micro-s = 0.5 microseconds. In serial transmission, data enters one bit at a time. So, the total delay = 0.5*8 = 4 micro seconds time is required to transmit information of 8 bits.