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Synchronous Counters

Synchronous Counters. Lecture Overview. Classifications of Counters Definitions Synchronous Counter… Modulus 8 with Discrete Gates (SSI) Modulus 16 with Discrete Gates (SSI) 74LS163 Synchronous 4 Bit Counter Understanding Device Truncated Count. Classifications of Counters.

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Synchronous Counters

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  1. SynchronousCounters

  2. Lecture Overview • Classifications of Counters • Definitions • Synchronous Counter… • Modulus 8 with Discrete Gates (SSI) • Modulus 16 with Discrete Gates (SSI) • 74LS163 Synchronous 4 Bit Counter • Understanding Device • Truncated Count

  3. Classifications of Counters • Asynchronous Counters • Only the first flip-flop is clocked by an external clock. All subsequent flip-flops are clocked by the output of the preceding flip-flop. • Asynchronous counters are slower than synchronous counters because of the delay in the transmission of the pulses from flip-flop to flip-flop. • Asynchronous counters are also called ripple-counters because of the way the clock pulse ripples it way through the flip-flops. • Synchronous Counters • All flip-flops are simultaneously clocked by an external clock. • Synchronous counters are faster than asynchronous counters because of the simultaneous clocking. • Synchronous counters are an example of a state machines design.

  4. Modulus-8 Synch Counter Analyses Q2 Q1 Q0 • Q0 : Toggles Every Time… J0 & K0 = 1 • Q1 : Toggles When Q0=1… J1 & K1 = Q0 • Q2 : Toggles When Q0=1 & Q1=1… J2 & K2 = Q1 x Q0

  5. Modulus-8 Synch Counter Design

  6. Modulus-16 Synch Counter Analyses Q3 Q2 Q1 Q0 • Q0 : Toggles Every Time… J0 & K0 = 1 • Q1 : Toggles When Q0=1… J1 & K1 = Q0 • Q2 : Toggles When Q0=1 & Q1=1… J2 & K2 = Q1 x Q0 • Q3 : Toggles When Q0=1 & Q1=1 & Q2=1… J3 & K3 = Q2xQ1xQ0

  7. Modulus-16 Synch Counter Design

  8. 74LS163 Synchronous 4 Bit Counter Clear Terminal Count Data In Data Out Enables Load Data

  9. Understanding Mutisim Labels DATASHEET Mutisim

  10. 74LS163 : How It Works

  11. 74LS163 : 6 (0110) to 15 (1111) CNT

  12. 74LS163 : 6 (0110) to 12 (1100) CNT

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