7490 Binary counter IC

The 7490 IC is a decade counter, which means it counts in decimal digits, specifically from 0 to 9. It functions by incrementing its count by 1 each time it receives a clock pulse. The IC contains four internal flip-flops and uses a series of logic gates to count.

Each time a clock pulse is received, it advances to the next sequential output state. When it reaches “9” (binary equivalent: 1001), the next clock pulse resets the count back to “0” (binary equivalent: 0000) and simultaneously causes a carry-out signal, which can be utilized for cascading multiple counters together to count beyond 9.

The 7490 IC usually has four outputs (labeled Q A, Q B, Q C, and Q D) that represent the BCD (Binary-Coded Decimal) count. It can count up, down, or both (up and down) based on its configuration using external circuitry.

This IC is widely used in digital circuits for applications like frequency dividers, timer circuits, and in systems requiring sequential counting.