CD4511 BCD to 7-Segment Decoder/Driver IC (DIP)

Overview

The CD4511 BCD to 7-Segment Decoder/Driver IC (DIP) is a CMOS logic device that converts 4-bit Binary-Coded Decimal (BCD) inputs into the seven segment outputs required to drive common cathode 7-segment LED displays. It simplifies numeric display tasks in digital circuits by controlling segments a to g directly and providing control pins for flexible operation.

Key Features

• Converts 4-bit BCD input (A, B, C, D) to 7-segment outputs (a–g)
• Control inputs: Latch Enable (LE), Lamp Test (LT), Blanking Input (BI)
• CMOS technology for low power consumption and high noise immunity
• Wide supply voltage range: 3V to 15V
• Direct drive capability for common cathode 7-segment LED displays
• Standard DIP-16 package for easy prototyping and PCB mounting

Pin Configuration and Functional Description

Inputs

• A, B, C, D: 4-bit BCD inputs
• LE (Latch Enable): Latches the inputs when active for stable display
• LT (Lamp Test): Forces all segments on for display testing
• BI (Blanking Input): Forces outputs off for blanking or multiplexing

Outputs

• Seven outputs corresponding to segments a, b, c, d, e, f, g
• Designed to source and sink sufficient current to light LED segments directly when used with appropriate resistors

Applications

• Digital clocks and timers
• Counter displays and frequency counters
• Calculators and numeric readouts
• Electronic measuring instruments
• Embedded systems requiring numeric display interfaces

Typical Connections and Usage Tips

• Use with common cathode 7-segment displays; if using common anode displays, a different driver is required.
• Place current-limiting resistors on each segment to protect LEDs and control brightness.
• Use the LT pin to quickly verify segment operation during assembly or testing.
• Drive LE appropriately to latch values when multiplexing or when stable display output is required.
• Observe supply voltage limits (3V to 15V) and decouple VCC to ground with a 0.1uF ceramic capacitor for noise suppression.

Electrical and Design Considerations

• CMOS inputs are sensitive to floating pins; tie unused inputs to a defined logic level.
• Check output current specifications for the chosen CD4511 variant to ensure it meets your LED brightness requirements.
• For battery-powered designs, the low power CMOS operation helps extend battery life across the 3V to 15V range.

Why Choose CD4511?

The CD4511 provides a simple, reliable way to drive 7-segment displays from BCD sources without extra driver chips. Its combination of LE, LT, and BI control pins makes it versatile for testing, blanking, and latching. The broad supply voltage and CMOS efficiency make it suitable for hobbyist projects and professional designs.

Package and Integration

Supplied in a DIP-16 package, the CD4511 is breadboard-friendly and easy to solder into through-hole PCBs. Its pinout is standardized for straightforward replacement and prototyping.

Ordering and Notes

• Part: CD4511, DIP-16 package
• Typical uses: educational kits, prototypes, and production designs with 7-segment displays

Note: Images are for illustration purposes only.