Texas Instruments CD4056BM96

Overview

CD4056BM96 from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing. It accepts 4-bit BCD input, latches data, decodes to seven-segment outputs (a–g), and provides active-low open-drain segment drivers capable of sinking up to 10 mA per segment at V_DD = 15 V. It operates across –55°C to +125°C and is housed in a 16-pin SOIC package.

For engineers reviewing the CD4056BM96 datasheet, CD4056BM96 pinout, CD4056BM96 application, or CD4056BM96 equivalent, this device is selected for low-power, high-voltage LED display driving in industrial panel meters, test equipment, and legacy instrumentation where BCD input compatibility and latch functionality are required.

Technical Context

The CD4056BM96 integrates a 4-bit D-type latch, BCD-to-7-segment decoder logic, and seven open-drain N-channel MOSFET output drivers - all on a single CMOS die. Its latch enables synchronous data capture before decoding, preventing transient segment glitches during input changes.

It features active-low segment outputs with no internal current-limiting resistors, requiring external anode-resistor networks when driving common-anode LEDs. Input thresholds are CMOS-compatible (V_IL ≤ 0.3 V_DD, V_IH ≥ 0.7 V_DD), and output voltage swing supports up to 15 V on segment pins independent of V_DD (within absolute max ratings).

Key Specifications

Pinout & Package

CD4056BM96 is supplied in a 16-pin Small Outline Integrated Circuit (SOIC) package (TI drawing D), 7.5 mm wide, 10.3 mm long, 1.75 mm max height, with 1.27 mm pitch leads. Pin 1 is located at the top-left corner with a molded index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4511BE and MC14495P, the CD4056BM96 uniquely combines CMOS low-power operation, open-drain flexibility for high-voltage LED driving, and hardware-supported multi-digit blanking - making it optimal for ruggedized, multi-digit industrial displays where reliability and voltage headroom are prioritized over minimal BOM count.

Availability

CD4056BM96 is available at Aetrix Electronics and suitable for industrial panel meters, test equipment front panels, and aerospace annunciator systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD4056BM96 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 decades of heritage in CMOS logic families including the 4000-series.

The CD4056B product line was engineered specifically for robust, low-power LED display interfacing in harsh environments - emphasizing latch stability, wide supply tolerance, and direct drive capability without external transistors.

FAQ

What is the maximum segment voltage the CD4056BM96 can drive?

The CD4056BM96 segment outputs (pins a–g) are open-drain N-channel MOSFETs rated for up to 15 V drain-source voltage. This allows direct connection to LED anodes supplied from 12 V or 15 V rails, provided external current-limiting resistors are used. The V_DD supply (pin 16) may be as low as 3 V, enabling logic-level control of high-voltage display segments - a key feature confirmed in the TI SCHS048C datasheet Absolute Maximum Ratings table.

Does the CD4056BM96 support cascading for multi-digit zero suppression?

Yes, the CD4056BM96 supports ripple blanking via its BI̅/RBO̅ pin (pin 2). When configured as Ripple Blank Output, it asserts a low signal when the decoded digit is zero and BI̅ is low - allowing daisy-chaining to upstream or downstream CD4056BM96 devices to suppress leading or trailing zeros in multi-digit displays. This behavior is explicitly defined in the Function Tables and Timing Diagrams of the TI SCHS048C datasheet.

Can the CD4056BM96 drive common-cathode LED displays?

No, the CD4056BM96 is designed exclusively for common-anode LED configurations. Its open-drain segment outputs sink current from LED anodes tied to a positive supply; connecting them to common-cathode displays would reverse bias the LEDs and prevent illumination. For common-cathode use, alternatives like CD4511BE (active-high outputs) are required - a distinction clearly documented in the CD4056BM96 Functional Description section.

What is the purpose of the LT̅ (Lamp Test) input on the CD4056BM96?

The LT̅ input (pin 1) is an active-low control that forces all seven segment outputs (a–g) low simultaneously, illuminating all segments regardless of BCD input state. This enables rapid hardware-level display verification during power-on self-test or maintenance without altering register contents or requiring microcontroller intervention - a feature validated in the Truth Table and Application Hints sections of the TI SCHS048C datasheet.

Is the CD4056BM96 RoHS-compliant and suitable for modern SMT assembly?

Yes, the CD4056BM96 is RoHS-compliant (lead-free NIPDAU finish), packaged in SOIC-16 (D), and rated MSL Level-1 with unlimited floor life at ≤30°C/60% RH. Its tape-and-reel packaging (2500 units per reel) and land pattern specifications align with IPC-7351 standards - confirmed in TI's official Packaging Information document dated 15-Jul-2026. This makes it fully compatible with high-volume automated SMT lines.