Texas Instruments CD4543BPWR

Overview

CD4543BPWR from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder driver IC designed for direct LED display interfacing. It features active-high latch enable, phase-controlled blanking, and TTL/CMOS-compatible inputs with 15 V absolute maximum supply rating. Its 16-pin TSSOP package supports high-density PCB layouts in digital panel meter and industrial counter applications.

For engineers reviewing the CD4543BPWR datasheet, CD4543BPWR pinout, CD4543BPWR application, or CD4543BPWR equivalent, this page delivers verified package dimensions, latch timing behavior, blanking control logic, and real-world display drive capability-critical for legacy 7-segment system upgrades and low-power instrumentation designs.

Technical Context

The CD4543BPWR implements a synchronous BCD-to-7-segment decoding function with integrated transparent latch and phase-selectable blanking. It accepts standard 4-bit binary-coded decimal input and drives common-anode LED segments directly via open-drain outputs capable of sinking up to 10 mA per segment at V_DD = 15 V.

Latch operation is controlled by LE (latch enable) and PH (phase select) pins: LE high enables transparent latching; PH selects between normal decode (PH = low) and blanking mode (PH = high). The device operates across the full military temperature range (–55°C to +125°C) and exhibits typical propagation delays of 120 ns at 10 V supply.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4511BE and 74HC4511, the CD4543BPWR uniquely combines phase-selectable blanking, common-anode drive, and –55°C to +125°C operation-making it the only option for ruggedized, multiplexed LED displays in harsh environments without redesign.

Availability

CD4543BPWR is available at Aetrix Electronics and suitable for digital panel meters, industrial counters, automotive instrument clusters, and legacy equipment retrofits requiring stable component supply and long-term lifecycle assurance.

Supply support for CD4543BPWR 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 solutions with over 90 years of innovation in industrial, automotive, and aerospace electronics.

The CD4543B family was developed for robust, low-power BCD-driven LED display systems in mission-critical instrumentation where reliability across extreme temperatures and supply voltages is mandatory.

FAQ

What is the maximum supply voltage rating for CD4543BPWR?

The CD4543BPWR has an absolute maximum supply voltage (V_DD) of 18 V, with recommended operating range from 3 V to 15 V. At 15 V, it delivers full 10 mA segment sink current while maintaining stable propagation delay and latch timing. Exceeding 15 V risks accelerated parametric drift and reduced long-term reliability, though brief transients up to 18 V are tolerated per TI's absolute maximum ratings specification.

Does CD4543BPWR support common-cathode LED displays?

No, CD4543BPWR is designed exclusively for common-anode LED displays. Its segment outputs (pins a–g) are open-drain and sink current only; they cannot source current to drive common-cathode configurations. Attempting to use CD4543BPWR with common-cathode LEDs results in no illumination. For common-cathode applications, consider alternatives like 74HC4511 or redesign with external inverters.

How does the PH pin affect display operation in CD4543BPWR?

The PH (Phase Select) pin on CD4543BPWR determines blanking behavior: when PH = low, decoded segment outputs reflect active BCD input; when PH = high, all segment outputs go high (blanking), independent of latch state. This allows synchronization with multiplexed digit scanning clocks-e.g., blanking during digit switching to eliminate cross-talk. PH is distinct from BI (Blanking Input), which overrides all logic and forces blanking unconditionally when low.

Is CD4543BPWR pin-compatible with CD4543BE in PDIP packages?

Yes, CD4543BPWR is functionally and electrically pin-compatible with CD4543BE (PDIP-16) and CD4543BM96 (SOIC-16): all share identical pin numbering, signal definitions, and logic behavior. However, physical mounting differs-CD4543BPWR uses 0.65 mm pitch TSSOP, requiring re-layout for solder paste stencil and land pattern per JEDEC MO-153. No changes to firmware or schematic netlist are needed.

What is the minimum input high voltage (V_IH) for CD4543BPWR at 5 V supply?

At V_DD = 5 V, the minimum guaranteed input high voltage (V_IH) for CD4543BPWR is 3.5 V, per TI's datasheet SCHS086D. This ensures reliable recognition of logic-high signals from standard 5 V TTL and CMOS sources. Inputs between 1.5 V and 3.5 V are undefined and may cause metastability; design must ensure clean transitions above 3.5 V for stable latch and decode operation.