Almost the entire screen is a tappable area, so you can count wherever you tap. Asynchronous counters are also called ripple-counters because of the way the clock pulse ripples it way through the flip-flops. The clock pulse is given to the first flip-flop. A digital counter, or simply counter, is a semiconductor device that is used for counting the number of times that a digital event has occurred.The counter's output is indexed by one LSB every time the counter is clocked. These are also called as Ripple counters, and are used in low speed circuits. Modulus Counter (MOD-N Counter) The 2-bit ripple counter is called as MOD-4 counter and 3-bit ripple counter is called as MOD-8 counter. A. Synchronous Counters are also called ripple counters. Ripple counters are so named because the count is like a chain reaction that ripples through the counter because of the time involved. Mathematically, accumulation of n integers x i for i=0, 1, n-1, can be given by where S is the sum.Asynchronous counters are also called as ripple counters. Asynchronous Counter. Asynchronous or ripple counter; synchronous counter; Asynchronous Counters. The logic diagram of a 2-bit ripple up counter is shown in figure. The Mod n counter â¦ What is up counter? The term asynchronous refers to events that do not have a fixed time relationship with each other . The propagation delay of each flip-flop adds together to give a total propagation delay for the counter. Asynchronous counters are also called ripple-counters because of the way the clock pulse ripples it way through the flip-flops. â¢ Asynchronous counters are also called ripple- counters because of the way the clock pulse ripples it way through the flip-flops.â 10 15. They are used as Divide by- n counters, which divide the input by n, where n is an integer. A counter can be constructed to operate as a synchronous circuit or as an asynchronous circuit. The output of each flip-flop is fed as the clock input for the higher-order flip-flop. Each FF (except the first FF) is clocked by the preceding FF. The propagation delay of each flip-flop adds together to give a total propagation delay for the counter. âRipple Counter is a simple counter application. Ripple counters can be made to count up or down. They are notable for being used to detect if objects emit nuclear radiation. Digital Logic Design Objective type Questions and Answers. Multiple counters are connected in series, to count up to any desired number. JustThinking. The result is called a ripple counter, which can count to 2n-1 where n is the number of bits (flip flop stages) in the counter. For these counters an external clock signal is applied to one flip-flop, and then the output of the preceding flip-flop is connected to the clock of the next flip-flop. Synchronous counters. n stage ripple counter can count up to 2^n-1. The count is called a ripple counter because of the rippling change of state from lower order to higher order stages when the count changes i.e. I request you please read that to complete discussion. 1 The complement of the count sequence counts in reverse direction. A ripple counter is also called an asynchronous counter because each flip-flop does not change at the same time. Asynchronous means that the events (setting and resetting of FFs) occur one after the other rather than all at once. 1 decade ago. Introduction â COUNTERS A counter is a register that goes through a predetermined sequence of states upon the application of clock pulses. Then the counter is also referred to as a count up binary counter the resulting output waveform for each stage is shown in Figure 4. All subsequent flip-flops are clocked by the output of the preceding flip-flop. Of course standard IC asynchronous counters are available such as the TTL 74LS90 programmable ripple counter/divider which can be configured as a divide-by-2, divide-by-5 or any combination of both. File list Tips: You can preview the content of files by clicking â¦ It has a series of flip-flops connected together. A ripple counter is also called an asynchronous counter because each flip-flop does not change at the same time. the 2 0 stage toggles the 2 1 stage, which may toggle the 2 2 stage etc. Question 3: A bus is a multi-wireâ¦ Digital Counters . Asynchronous or ripple counters. 3. But we can use the JK flip-flop also with J and K connected permanently to logic 1.