What are decade counters?
A decade counter is one that counts in decimal digits, rather than binary. A decade counter may have each (that is, it may count in binary-coded decimal, as the 7490 integrated circuit did) or other binary encodings. A decade counter is a binary counter that is designed to count to 1001 (decimal 9).
What is synchronous decade counter?
What is a synchronous decade counter? A logical counter able to increment a 4 bits word at each clock tick from 0 to 9 in a loop. The main component to make a counter is a J-K Flip Flop. Actually, one for each bit. Otherwise, the decimal greatest number of a decade counter is 9 that is encoded by 1001 in binary code.
What is BCD decade counter?
A BCD (Binary Coded Decimal) counter also termed as decade counter is a series type of digital counter which is designed to count ten digits. It performs the operation of resetting automatically when there is a new clock input signal.
How many pulse a 4-bit ripple counter can count?
16 pulses
In 4-bit ripple counter, n value is 4 so, 4 JK flip flops are used and the counter can count up to 16 pulses.
What is asynchronous ripple counter?
In Asynchronous Counter is also known as Ripple Counter, different flip flops are triggered with different clock, not simultaneously. While in Synchronous Counter, all flip flops are triggered with same clock simultaneously and Synchronous Counter is faster than asynchronous counter in operation.
When does a ripple counter change its value?
So, when a used as Ripple counter D flip flop has initial value as 1. When the clock pulse undergoes the transition from 1 to 0 the flip flop should change the state. But according to truth table when D value is 1 it stays on 1 until D value is changed to 0.
What happens when the decade counter is at rest?
When the Decade counter is at REST, the count is equal to 0000. This is first stage of the counter cycle. When we connect a clock signal input to the counter circuit, then the circuit will count the binary sequence. The first clock pulse can make the circuit to count up to 9 (1001).
What are the outputs of a decade counter?
As it is a 4 bit binary decade counter, it has 4 output ports QA, QB, QC and QD. When the count reaches 10, the binary output is reset to 0 (0000), every time and another pulse starts at pin number 9. The Mod of the IC 7490 is set by changing the RESET pins R1, R2, R3, R4.
How many pulses can a 4 bit ripple counter count?
In 4-bit ripple counter, n value is 4 so, 4 JK flip flops are used and the counter can count up to 16 pulses. Below the circuit diagram and timing diagram are given along with the truth table.