Which type of counter is IC 7490?

ripple-type decade counter
IC 7490 is a 4-bit, ripple-type decade counter. It consists of four master/slave flip-flops, which are internally connected to form a divide-by-two section and a divide-by-five section. Each section has a separate clock input to change the output states of the counter on a high-to-low clock transition.

What are programmable counters?

[prō′gram·ə·bəl ′kau̇nt·ər] (electronics) A counter that divides an input frequency by a number which can be programmed into decades of synchronous down counters; these decades, with additional decoding and control logic, give the equivalent of a divide-by-N counter system, where N can be made equal to any number.

What is a programmable digital timer?

Digital timers keep track of timing; to trigger an action, to start timing once triggered by an action, or both. Some products are programmable while others may be fixed at a set internal time and function. In addition to the number and type of functions, these devices differ in terms of time range settings.

What is 74LS90 IC?

74LS90 is basically a MOD-10 decade counter that generate a BCD output code. It consists of four master-slave JK flip-flop, which are internally connected to provide MOD-2 (count to 2) counter and MOD-5 counter. 74LS90 also have an independent toggle JK flip-flop by CLKA and other three are driven by the CLKB.

What are digital counters?

Counter is a sequential circuit. A digital circuit which is used for a counting pulses is known counter. Counter is the widest application of flip-flops. It is a group of flip-flops with a clock signal applied.

What are programmable or presettable counters?

A variety of programmable or presettable counters is available. By presetting the stages of a counter, one can achieve timing because the counter can be made to reset or “fill up” when the preset count has been reached. Another application is to divide the input frequency by a preset or programmed number.

What are the common control features used in synchronous counters?

• Down counters. • Frequency division. Understand the operation of synchronous counters. Describe common control features used in synchronous counters. • BCD counters. • Up/down control. • Enable/disable. • Preset and Clear. Use software to simulate counter operation. Asynchronous Counters.

What is a programmable divide-by-N counter?

Programmable divide-by-N counters are particularly useful in frequency synthesizers phase-locked loops, and other frequency division applications. A variety of programmable or presettable counters is available.

Which IC is used to display the lapsed time intervals?

The counter and the display stage is built using IC3, IC4, IC5, IC6 and is used for showing the lapsed time intervals over a 2 digit 7 segment LED display. The divide by 10 pulses from IC2 is applied to pin#14 of IC3, which is a binary decimal divider IC.