CD4511BCN

Display Drivers Overview

The onsemi CD4511BCN is a CMOS BCD-to-7-segment latch/decoder/driver designed for common-cathode LED displays. It operates within a supply voltage range of 3V to 15V and draws a typical supply current of 10 µA. The device is housed in a 16-PDIP package with a pin pitch of 0.300 inches (7.62mm). It supports an operating temperature range from -55°C to 125°C. This component provides direct drive capability for seven-segment indicators, integrating latching, decoding, and output driving functions into a single integrated circuit.

Display Drivers Feature Summary

• Integrates input latching, BCD-to-seven-segment decoding, and high-current source output drivers for direct LED interfacing.
• Features dedicated control pins for lamp testing and global blanking to manage display states independently of data inputs.
• Provides deterministic data retention through internal latching mechanisms that hold the last valid decoded state.

Display Drivers Applications

• Driving common-cathode seven-segment LED numeric displays in industrial instrumentation.
• Static digit readout modules for timer circuits and digital counters.
• Motor control panel interfaces requiring stable numerical feedback without microcontroller overhead.

Display Drivers Procurement Notes

Verify component authenticity as this part number is obsolete. Confirm package integrity upon receipt. Check datasheet revisions for electrical parameter variations between original and successor manufacturers. Ensure compatibility with existing PCB footprints when transitioning to replacement sources.

Display Drivers Selection Notes

Select this component for designs requiring hardware-based BCD translation to reduce processor load. Verify that the target display is common-cathode compatible. Ensure the system power supply remains within the specified 3V to 15V range. Consider thermal dissipation limits if operating at maximum ambient temperatures or utilizing multiple units simultaneously.

Display Drivers Part Context

This device belongs to the standard CD4511 family of CMOS logic devices. It serves as a foundational building block for discrete digital display systems. The 'BCN' suffix typically denotes a specific plastic dual-in-line package variant manufactured by onsemi. It represents a legacy solution for simple numeric indication tasks before widespread adoption of multiplexed driver ICs.

Display Drivers Replacement Considerations

Texas Instruments CD4511BE is a confirmed direct substitute. Verify pinout compatibility and electrical specifications against the original datasheet before implementation.

Display Drivers FAQ

What is the function of the Lamp Test (LT) pin?

When the Blanking Input (BI) is high and the LT pin is low, all segment outputs are forced high, illuminating all segments to verify display functionality regardless of BCD input status.

How does the Latch Enable (LE) pin affect data updates?

When LE is low, the decoder responds to input changes. When LE transitions high, the current BCD input is latched, holding the display constant even if subsequent input signals fluctuate.

Why are invalid BCD codes not displayed?

The internal logic includes a blanking mechanism that suppresses output for BCD inputs ranging from 1010 to 1111, preventing undefined character patterns on the display.