Texas Instruments CD4054BE

Overview

CD4054BE from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder driver IC designed for direct LED segment control in digital displays. It features 4-bit BCD input, active-low segment outputs (a–g), latched input storage, and TTL-compatible input thresholds. It operates across –55°C to +125°C and drives common-anode LED displays without external current-limiting resistors when used with appropriate supply voltage.

For engineers reviewing the CD4054BE datasheet, CD4054BE pinout, CD4054BE application, or CD4054BE equivalent, key selection considerations include its latched BCD decoding function, active-low open-drain outputs, wide temperature range, and compatibility with both PDIP and TSSOP packages for legacy and space-constrained designs.

Technical Context

The CD4054BE implements synchronous latching of BCD inputs followed by static decoding into seven segment drive signals (a–g), with output polarity inverted to support common-anode LED configurations. Its internal latch prevents display flicker during input transitions.

It uses standard CMOS logic levels with V_IL ≤ 1.5 V and V_IH ≥ 3.5 V at V_DD = 5 V, and supports operation up to 15 V. Output sink capability is rated at 1.5 mA per segment at V_DD = 5 V, scalable with supply voltage.

Key Specifications

Pinout & Package

CD4054BE is supplied in a 16-pin plastic dual-in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row, identified by a notch or dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BCD-to-7-segment latch/decoder applications.

Compared with CD4056BE and MC14495P, the CD4054BE offers superior design flexibility via open-drain outputs and full military-temperature support, making it the preferred choice for ruggedized, field-serviceable, or safety-critical display subsystems where diagnostic capability and thermal resilience are mandatory.

Availability

CD4054BE is available at Aetrix Electronics and suitable for industrial panel meters, avionics display units, and test equipment front panels requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4054BE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic ICs, with over 90 years of innovation in reliable, high-performance components.

The CD4054BE belongs to TI's legacy CD4000B-series CMOS logic family, engineered for robust, low-power digital interfacing in industrial, aerospace, and instrumentation applications where latch stability and wide-voltage operation are essential.

FAQ

What is the primary function of the CD4054BE?

The CD4054BE is a CMOS BCD-to-7-segment latch/decoder driver IC that converts 4-bit binary-coded decimal inputs into active-low segment drive signals (a–g) for common-anode LED displays. Its integrated latch prevents display flicker during input transitions, and it supports direct LED driving with open-drain outputs. The CD4054BE is widely used in industrial and aerospace instrumentation where deterministic digit rendering is required.

Does the CD4054BE require external current-limiting resistors for LED segments?

Yes - the CD4054BE features active-low open-drain outputs, meaning each segment output (a–g) must be pulled up to V_DD via an external resistor to limit current through the LED. Unlike the CD4056BE, it does not include internal current-limiting circuitry. Proper resistor selection depends on V_DD, LED forward voltage, and desired segment brightness; typical values range from 330 Ω to 2.2 kΩ at 5 V.

How do the BL and LT pins on the CD4054BE operate?

The BL (Blank) pin is active-low and forces all segment outputs high (LEDs off) when asserted, enabling display blanking during data updates or system standby. The LT (Lamp Test) pin is also active-low and forces all segment outputs low (LEDs on) to verify LED continuity and wiring integrity. Both functions operate independently of the latch and BCD inputs, allowing real-time diagnostics without interrupting normal operation of the CD4054BE.

Can the CD4054BE operate at 3.3 V logic levels?

No - the CD4054BE is not guaranteed to operate reliably at 3.3 V. Its minimum specified supply voltage is 3 V, but input threshold voltages (V_IL ≤ 1.5 V, V_IH ≥ 3.5 V at V_DD = 5 V) indicate it is optimized for 5 V or higher systems. At 3.3 V, V_IH may exceed 70% of V_DD, risking unreliable logic recognition. For 3.3 V systems, consider level-shifting or alternative display drivers like the TLC5928x series. The CD4054BE remains fully functional at 5 V, 10 V, or 12 V.

Is the CD4054BE pin-compatible with the CD4056BE?

Yes - the CD4054BE and CD4056BE share identical pinouts, package options (including PDIP-16 and TSSOP-16), and core BCD decoding functionality. However, their output structures differ: CD4054BE uses open-drain outputs requiring external pull-ups, while CD4056BE provides buffered, current-limited outputs. This means they are physically interchangeable on PCBs, but circuit modifications (e.g., removing pull-up resistors) are required when substituting CD4054BE for CD4056BE or vice versa.