7491 (4-bit binary counter with an asynchronous reset)

Description

The IC 7491 is a 4-bit binary counter with an asynchronous reset feature, commonly used in digital circuits for counting applications, such as frequency dividers or time-delay circuits. It’s part of the 7400 series of ICs and is widely used in various digital systems for counting or sequencing purposes.7491 IC Description:The 7491 is a 4-bit binary ripple counter that counts in binary from 0 to 15 (0000 to 1111 in binary). It can operate in asynchronous mode and provides a binary output corresponding to the current count. This IC is useful for applications requiring counting, timing, or frequency division.Key Features:4-bit Binary Counter: It can count from 0 to 15 (i.e., 4 bits).Asynchronous Reset: The counter can be asynchronously reset to zero by applying a logic LOW to the reset pin (pin 6), regardless of the clock state.Decade Counter Capability: When used with external components, it can be configured as a decade counter (counting from 0 to 9) for applications like clock dividers or decimal counters.Ripple Counter Configuration: The counter is implemented in a ripple configuration, meaning each bit (flip-flop) is clocked sequentially.Low Power Consumption: As part of the CMOS family, it consumes low power when not actively counting.Pin Configuration (14-pin package):Here’s the standard pinout for the 7491 4-bit binary counter:Q1: Output of the first flip-flop (least significant bit).Q2: Output of the second flip-flop.Q3: Output of the third flip-flop.Q4: Output of the f