4026 Decade Counter 7-Segment Decoder IC | Pro Tronix

Product Description

The 4026 Decade Counter 7-Segment Decoder IC is a high-performance CMOS integrated circuit designed to simplify digital counting displays. Combining a 5-stage Johnson decade counter and an internal 7-segment LED display decoder in a single chip, it converts incoming clock pulses directly into drive signals for common-cathode 7-segment LED displays without requiring an external BCD-to-7-segment decoder IC.

Operating on a wide supply voltage range from 3V to 18V DC with ultra-low static power consumption, the 4026 features high output drive capability suitable for direct LED driving. It includes specialized control pins such as Display Enable (DE), Display Enable Output (DEO), and a dedicated Carry Out pin (CO) that completes one full pulse every 10 counts, allowing effortless multi-digit cascading. Housed in a standard 16-pin DIP package, it interfaces seamlessly with 555 timers, microcontrollers like Arduino, STM32, and ESP32, or discrete oscillator circuits. It is an essential component for digital counters, electronic scoreboards, event tally meters, and digital logic training kits.

⚠️ Reset & Display Enable Tip: For standard continuous counting and display driving, keep the Reset pin (Pin 15) grounded (Logic LOW) and drive the Display Enable In pin (Pin 3) HIGH. Driving Pin 3 LOW turns off the 7-segment display outputs to save power while allowing the internal counter to continue tracking clock pulses in the background.

Technical & Logic Architecture

This integrated counter and display driver offers streamlined counting operations:

• Integrated Counter & Decoder: Converts clock pulses directly into 7-segment (a through g) driving outputs.

• Cascading Carry Out Signal: Pin 5 (Carry Out) provides a clean clock pulse for every 10 input pulses to trigger secondary counter digits directly.

• Wide Supply Voltage Range: Flexible operating supply voltage from 3V to 18V DC for direct interfacing across 3.3V, 5V, 12V, and 15V logic systems.

• Breadboard-Friendly Package: Standard 16-pin Dual In-Line Package (DIP-16) for easy insertion into breadboards and IC sockets.

4026 Truth Table (Function Table)

Key Terms for Truth Table:

• H: High Voltage Level (Logic 1 / VDD)

• L: Low Voltage Level (Logic 0 / VSS)

• X: Don’t Care (Can be High or Low)

• Rising Edge: Low-to-High transition of the Clock signal

4026 Pinout Description & Logic Functions

• Pin 1 – CLK (Clock Input): Triggers count sequence on Low-to-High (Rising Edge) clock transition.

• Pin 2 – CE (Clock Enable / Inhibit): Active-LOW enable line. Connect to GND for continuous counting.

• Pin 3 – DE (Display Enable In): Drive HIGH to turn ON segment outputs; drive LOW to blank the display.

• Pin 4 – DEO (Display Enable Out): Echoes Display Enable status for cascading display blanking logic across multiple digits.

• Pin 5 – CO (Carry Out): Emits 1 pulse for every 10 input clock pulses to clock the next 4026 in multi-digit displays.

• Pin 6 – Segment f: Output driver for 7-segment display segment f.

• Pin 7 – Segment g: Output driver for 7-segment display segment g.

• Pin 8 – VSS (GND): Ground reference pin (0V).

• Pin 9 – Segment d: Output driver for 7-segment display segment d.

• Pin 10 – Segment a: Output driver for 7-segment display segment a.

• Pin 11 – Segment e: Output driver for 7-segment display segment e.

• Pin 12 – Segment c: Output driver for 7-segment display segment c.

• Pin 13 – Segment b: Output driver for 7-segment display segment b.

• Pin 14 – Ungated C-Segment Output: Direct segment C output for driving external logic or additional indicators.

• Pin 15 – RST (Reset): Asynchronous Master Reset (Active HIGH). Drive HIGH to force count back to 0.

• Pin 16 – VDD: Positive power supply input pin (+3V to +18V DC).

Operating Modes Summary

1. Decade Counting & Display Decoding: Steps sequentially from 0 through 9 on each clock pulse and wraps back to 0 on the 10th pulse while outputting the matching 7-segment code.

2. Multi-Digit Cascading: Connect Pin 5 (CO) of the units counter to Pin 1 (CLK) of the tens counter to build multi-digit counters (e.g., 0-99 or 0-999 displays).

3. Display Power Saving / Blanking: Drive Pin 3 (DE) LOW to extinguish display segments without losing internal count data.

Applications

• Digital Event Counters: Building manual or sensor-driven object counters and visitor tally meters.

• Electronic Scoreboards: Displaying scores and team totals using 7-segment LED displays.

• Frequency & Pulse Meters: Displaying clock frequencies and pulses in digital logic training setups.

Technical Specifications

What’s in the Box

• 1 x 4026 Decade Counter 7-Segment Decoder IC (DIP-16).

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🛠️ Complete Your Breadboard Setup

To quickly wire and test the 4026 Decade Counter 7-Segment Decoder IC without soldering, make sure to check out our collection of breadboards, prototype boards, and jumper wires:

• Breadboards & Prototype PCBs: Explore our full range of solderless breadboards and prototyping boards for easy circuit assembly: Pro Tronix Breadboards & PCBs

• Jumper Wires & Connecting Cables: Grab high-quality male-to-male and male-to-female jumper wires to connect your IC pins to power and signal lines: Pro Tronix Wires & Cables Collection