Logic Diagram 7490. 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. The mod of the ic 7490 is set by changing the reset pins r1 r2 r3 r4.
As it is a 4 bit binary decade counter it has 4 output ports qa qb qc and qd. R1 it is the reset pin to reset the circuit to start the counting again. 5 2 fast and ls ttl data sn5474ls90 sn5474ls92 sn5474ls93 logic diagram ms1 ms2 mr1 mr2 cp0 cp1 q0 q1 q2 q3 mr1 cp0 cp1 q0 q1 q2 q3 mr2 ls90 mr1 cp0 cp1.
The pinout diagram of the 7490 decade counter is shown here.
The divide by twelve counters were used to provide the clock with the mod six. Logic diagram of ic 7490. Logic diagram of ic 7490 learning sequential logic design for a digital clock 14 steps 50hz 60hz frequency generator circuit using crystal narbencreme sandoz 600 promedius co uk top 10 simple electronic projects for beginners in 2014 bcd counter circuit basic electronics tutorials mod counters are truncated modulus countersbasic ic 7490 datasheet pdf decade and binary. The input count pulses are applied to input a and pins 236 and 7 should be grounded.