74HC393 Dual 4-Bit Binary Ripple Counter IC - 14-Pin DIP Package

When your automation circuit or logic system needs to count incoming events, generate custom frequencies, or divide a master clock signal, using microcontroller code can sometimes create unnecessary processing lag. The 74HC393 handles this entirely in hardware. This 14-pin integrated circuit houses two completely independent 4-bit binary ripple counters. Because it contains two distinct counting blocks on a single chip, you can use them separately to track two different events, or easily cascade them together to create a powerful, single 8-bit counter capable of counting from 0 up to 255.

Each 4-bit counter works by listening to a negative-edge clock input. Every time the clock signal transitions from HIGH to LOW, the counter increments by one, outputting the result across four parallel binary pins. Each stage divides the incoming frequency by two, making this chip incredibly effective for scaling down high-frequency oscillator signals. Additionally, each counter features its own dedicated, active-HIGH Master Reset pin. Pulsing this pin instantly clears the entire 4-bit count back to zero, giving your system total control over specific counting limits and cycling sequences.

Key Features & Functional Advantages

• Dual Independent Counters: Packs two separate 4-bit binary counters into a single 14-pin package, allowing you to run two independent counting tasks simultaneously.

• Cascadable 8-Bit Capability: By simply connecting the highest output pin of the first counter to the clock input of the second counter, the chip seamlessly transforms into a full 8-bit ripple counter.

• Asynchronous Master Reset: Features independent reset pins for each counter block that instantly clear all outputs to LOW, overriding the clock signal for precise safety and cycling control.

• High-Speed CMOS Architecture: Capable of handling rapid input frequencies up to 50 MHz (typical at 5V) while drawing virtually zero quiescent current when idle.

• Breadboard Native (14-DIP): Standard 0.1-inch (2.54mm) pin pitch allows it to drop directly into standard solderless breadboards, perfboards, and 14-pin IC sockets.

Perfect For

• Frequency Division Networks: Excellent for taking a fast master clock signal and stepping it down to slower, usable frequencies for downstream digital logic blocks.

• Digital Clocks and Timers: Widely used to build multi-stage timing chains that count seconds, minutes, and hours by resetting the count at specific values like 60.

• Event Tracking and Multiplexing: Perfect for counting physical events, sensor triggers, or button presses before sending a summarized count to a microcontroller.

• Hardware Address Generation: Ideal for pairing with binary sequences to sequentially step through addresses in RAM, ROM, or multiplexed LED displays.

Technical Specifications

• Logic Family: 74HC High-Speed CMOS

• Logic Function: Dual 4-Bit Binary Ripple Counter

• Counter Type: Binary Ripple Counter

• Number of Bits: 8 Bits total (Two independent 4-bit stages)

• Trigger Type: Negative-Edge (High-to-Low transition)

• Operating Supply Voltage: 2.0V to 6.0V DC

• Package Case: 14-DIP 0.300 inch width

• Mounting Type: Through-Hole

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