CD4511BE Decoder: Pin Configuration, Features, Circuit and Applications
27 October 2023
Ⅱ. Overview of CD4511BE decoder
Ⅲ. Symbol, footprint and pin configuration of CD4511BE decoder
Ⅳ. Technical parameters of CD4511BE decoder
Ⅴ. What are the features of CD4511BE decoder?
Ⅵ. How does the CD4511BE decoder work?
Ⅶ. Example circuit of CD4511BE decoder
Ⅷ. How to use the CD4511BE decoder?
Ⅸ. What are the applications of CD4511BE decoder?
The decoder is a type of multiple-input multiple-output combinational logic circuit device. Its working principle is to take the encoded data as an input signal, compare it with the data to be decoded, and then generate a decoded signal that meets the requirements at the output end. This process is called decoding, which implements the conversion from encoding to decoding.
It can be divided into variable decoding and display decoding. A variable decoder is generally a device with less input and more output. Common ones include n-line-2^n-line decoding and 8421BCD code decoding. The display decoder is used to convert binary numbers into seven-segment codes, which can be further divided into driving LEDs and LCDs.
CD4511BE is a seven-segment code decoder used to drive common cathode digital tube displays. This CMOS circuit combines various essential functions, including BCD (Binary Coded Decimal) conversion, blanking, and latch control, along with seven-segment decoding and driving capabilities. It can deliver a significant current draw, making it well-suited for directly powering LED displays, thereby simplifying the implementation of such displays.
The operating temperature of the decoder ranges from -55°C to 125 °C. Moreover, the device exhibits flexibility in its power supply requirements, accommodating voltages between 3V and 18V. To enhance ease of use and transportation, the CD4511BE is packaged in a tube, ensuring protection and ease of handling.
Replacement and equivalent:
• CD4511BFMSR
• HCC4511BF
• MC14511BALD
CD4511BE has a total of 16 pins and their names are as follows:
Pin 1, 2, 6, 7 (B, C, D, A): 4-bit data input
Pin 3 (LT): To test the display LEDs
Pin 4 (BL): To turn-off the LEDs of the display
Pin 5 (LE): Store or strobe a BCD code
Pin 8 (GND): Ground
Pin 9, 10, 11, 12, 13, 14, 15 (e, d, c, b, a, g, f): Outputs for the 7-segment display
Pin 16 (VDD): Positive supply input
• It is used as input latch for BCD code storage.
• Manufactured with CMOS technology, it boasts low power consumption and high noise rejection capabilities.
• Its logic circuit consumes low power.
• The CD4511BE provides the capability to program BCD input data and blanking input, enabling users to choose the digits to be displayed and decide when to deactivate the display.
• Its output drive capability is up to 25mA, suitable for conversion from BCD (Binary Coded Decimal) to 7-segment LED digital display.
• It has high output source capability up to 25mA.
• It has two modes of high-level input and low-level input, and can directly drive common anode or common cathode LED digital tubes.
The working principle of CD4511BE is as follows.
1. BCD input
The CD4511BE chip has four BCD input pins (A, B, C, D) and can accept 4-bit binary code input.
2. Latch
The input data is first stored in the latch of the chip. When the latch input enable terminal LE is high level, the contents of the latch will be latched.
3. Decoding
The data stored in the latch is decoded by the CD4511BE’s decoder to determine the number to be displayed on the 7-segment LED digital display. The output of the decoder drives 7 output pins (a, b, c, d, e, f, g), each of which controls an LED segment.
4. Display
Each segment (a, b, c, d, e, f, g) of the 7-segment LED digital display is controlled by an output pin (a, b, c, d, e, f, g) to displays the number output by the decoder.
5. Blanking
When the output of the decoder is "1111", the blanking input of the chip is low level, and all segments of the 7-segment LED display will be turned off to display blank.
6. Latch clearing
The data in the latch can be cleared by pulling the enable terminal LE low.
First, we connect the GND pin to the negative power terminal of the car and the VDD pin to the positive power terminal. Next, we input numbers displayed in binary form on the four pins B, C, D, and A and connect the seven-segment LED display to these output pins. Additionally, there is a lamp test pin for testing the operation of all display sections. We set it high during normal operation and low when trying a seven-segment display. Finally, the LE pin is responsible for storing the current value, we just need to set this pin low to operate normally.
• Counter
• Temperature controller
• Digital instrument
• LED lighting
• Digital clock
• Digital metering equipment
• Smart home devices
Frequently Asked Questions
1. What is the process of BCD to segment conversion?
First, our decimal number is changed to its BCD equivalent signal then BCD to seven segment decoder converts that signals to the form which is fed to seven segment display.
2. What is the CD4511BE IC used for?
The CD4511BE is used to convert binary-coded decimal (BCD) input into a 7-segment display format. It's often used to drive 7-segment LED displays.
3. What is the operating temperature range of CD4511BE?
The operating temperature of CD4511BE ranges from -55°C to 125 °C.
4. How is the CD4511BE commonly used in practical circuits?
In practical circuits, the CD4511BE is often used in combination with microcontrollers, counters, or other digital logic to create digital displays, such as digital clocks, temperature displays, and more.
5. What is the purpose of the seven segment display?
A seven-segment LED is a digital display module specialized to display numerical information. Light-emitting diodes (LEDs) arranged in the shape of numbers offer an easily visible display. They are sometimes called "seven-segment displays" or "seven-segment indicators."
