Digital Electronics: Principles, Devices and Applications

Counters and Registers 469Table 11.16(continued).Type Function Logicnumberfamily4518 B Dual four-bit decade counter CMOS4520B Dual four-bit binary counter CMOS4522 B Four-bit BCD programmable divide-by-N counter CMOS4722 B Programmable counter/timer CMOS4731 B Quad 64-bit static shift register CMOSMC 10136 Universal hexadecimal counter ECLMC 10137 Universal decade counter ECLMC 10141 Four-bit universal shift register ECLMC 10154 Binary counter (four-bit) ECLMC 10178 Four-bit binary counter ECL8. What do you understand when the PRESET, CLEAR, UP/DOWN, master reset and parallel loadfunctions of a counter are designated as PR, CLR, U/D, MR and PL respectively?9. What are counters with arbitrary count sequences? Briefly describe the procedure for designing acounter with a given arbitrary count sequence.10. Give at least one IC type number for:(a) a four-bit binary ripple counter;(b) a four-bit synchronous counter;(c) an eight-bit serial-in serial-out shift register;(d) a bidirectional universal shift register.Problems1. For the multistage counter arrangement of Fig.11.54, determine the frequency of the output signal.125 Hz1MHz4-bitBinaryRippleCounter5-BitRingCounterBCDCounter5-bitShiftCounterf 0Figure 11.54 Problem 1.2. A four-bit binary UP counter is initially in the 0000 state. Then the clock pulses are applied. Sometime later the clock pulses are removed, and at that the counter is observed to be in the 0011 state.What is the minimum number of clock pulses that could possibly have occurred?33. An eight-bit binary ripple UP counter with a modulus of 256 is holding the count 01111111. Whatwill be the count after 135 clock pulses be?00000110