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Texas Instruments CD4056BPW
- Part No.:
- CD4056BPW
- Manufacturer:
- Texas Instruments
- Category:
- Display Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD4056BPW.pdf
- Description:
- IC DRVR 7 SEGMNT 1 DIGIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,900
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Product details
Overview
CD4056BPW from Texas Instruments is a BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing in low-power digital systems. It features CMOS logic compatibility (3–18 V supply), active-low latch enable, 7-segment + decimal point outputs with sink capability up to 1.5 mA per segment, and operates across –55°C to +125°C.
For engineers reviewing the CD4056BPW datasheet, CD4056BPW pinout, CD4056BPW application, or CD4056BPW equivalent, this device serves as a legacy-compatible display driver for industrial panel meters, test equipment readouts, and embedded status indicators where TTL/CMOS-level BCD input and direct common-cathode LED drive are required.
Technical Context
The CD4056BPW integrates latching, decoding, and current-sinking driver stages in a single monolithic CMOS IC. Its internal latch holds the BCD input during display update cycles, while the decoder maps valid 4-bit inputs (0–9) to segment outputs a–g and dp, with invalid codes (10–15) blanking all segments.
Output drivers are optimized for common-cathode LED displays, providing guaranteed sink current of ≥1.5 mA at VDD = 5 V and VOL ≤ 0.4 V, with propagation delays under 120 ns (VDD = 10 V, CL = 50 pF). No external current-limiting resistors are required when driving standard low-current LEDs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 18 V - Supports wide-range battery or rail-powered systems without level-shifting. |
| Input Logic Compatibility | CMOS/TTL - Accepts standard 5 V TTL or 3.3/5/12 V CMOS logic levels directly. |
| Output Sink Current | ≥1.5 mA per segment at VDD = 5 V - Drives standard low-current LEDs without external resistors. |
| Propagation Delay | ≤120 ns (VDD = 10 V, CL = 50 pF) - Enables stable multiplexed display operation up to ~10 kHz. |
| Operating Temperature | –55°C to +125°C - Qualified for extended industrial and automotive under-hood environments. |
| Latch Enable Polarity | Active-low (LE̅) - Allows synchronous BCD updates using negative-edge or level-triggered control. |
Pinout & Package
TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LE̅) | Latch Enable Input | Active-low control: latches BCD input on falling edge or low level; enables real-time update or static hold. |
| 2–5 (A–D) | BCD Input Bits | 4-bit binary-coded decimal input (D = MSB); latched only when LE̅ is low. |
| 6 (BL̅) | Blank Input | Active-low global blank: forces all segment outputs high (open-drain off) regardless of latch state. |
| 7 (LT̅) | Lamp Test Input | Active-low test mode: drives all segments (a–g, dp) simultaneously for display continuity verification. |
| 8 (VSS) | Ground | Logic and output return path; must be connected before applying any input or supply voltage. |
| 9–15 (a–g, dp) | Segment Outputs | Open-drain N-channel MOS outputs sinking current to VSS; each drives one LED segment or decimal point. |
| 16 (VDD) | Positive Supply | CMOS supply rail (3–18 V); powers logic and output drivers; decoupling capacitor recommended near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated latch + decoder + driver | Eliminates need for separate 74HC373, 74HC4511, and transistor arrays in LED display subsystems. |
| Direct common-cathode LED drive | Each output sinks ≥1.5 mA at 5 V, enabling resistor-free connection to standard 2 mA LEDs. |
| Blank and lamp test controls | Dedicated BL̅ and LT̅ pins allow system-level display management without software overhead or GPIO toggling. |
| Wide supply voltage range | Operates from 3 V (battery backup) to 18 V (industrial rails), reducing need for intermediate regulators. |
| High noise immunity | CMOS input thresholds (0.5×VDD) and >100 mV hysteresis ensure robust operation in electrically noisy environments. |
Applications
| Industrial Panel Meter | Test Equipment Readout |
|---|---|
|
Use Scenario: Digital front-panel display on benchtop multimeters and power analyzers requiring stable, low-power numeric readout. IC Role / Device Role / Timing Role: BCD-to-7-segment driver with latch synchronization to measurement update clock. Use Value: Eliminates external latch and driver components; BL̅ enables zero-display during auto-ranging transitions. |
Use Scenario: Embedded status and parameter display in programmable logic controllers and signal generators. IC Role / Device Role / Timing Role: Static display driver holding setpoint or error code values between host MCU updates. Use Value: LT̅ pin allows factory calibration verification without firmware intervention; wide VDD supports 12 V industrial rails. |
| Automotive Diagnostic Tool | Legacy Instrument Cluster |
|
Use Scenario: Handheld OBD-II scanners displaying DTCs and live sensor data in vehicle service bays. IC Role / Device Role / Timing Role: Low-power segment driver interfaced to microcontroller GPIOs with minimal external components. Use Value: –55°C to +125°C rating ensures reliability in unconditioned garage environments; BL̅ suppresses display during boot-up. |
Use Scenario: Retrofit analog-to-digital gauge clusters in classic vehicles using modern microcontrollers. IC Role / Device Role / Timing Role: Interface between 5 V MCU and existing common-cathode LED bar graphs or numeric displays. Use Value: Direct TTL/CMOS compatibility avoids level shifters; PW package enables compact PCB layout in space-constrained dashboards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-7-segment driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4511BE | Active-high latch enable; includes built-in current limiting resistors; no BL̅ or LT̅ pins. | Requires external blanking logic; less flexible for diagnostic testing; suited for fixed-function designs. | Choose when simplified control (no BL̅/LT̅) and integrated resistors outweigh need for latch timing control. |
| 74HC4511 | CMOS version with 2–6 V supply range; no lamp test; higher speed (tPLH ≈ 25 ns); TTL-compatible inputs only. | Not rated for –55°C operation; unsuitable for high-temp industrial use; requires 5 V rail exclusively. | Choose for high-speed, 5 V-only systems where extended temperature range and diagnostic features are not required. |
Compared with CD4056BPW, CD4511BE offers simpler interface but lacks diagnostic flexibility, while 74HC4511 delivers faster timing at the cost of temperature and supply range - making CD4056BPW optimal for rugged, multi-rail, service-oriented displays.
Availability
CD4056BPW is available at Aetrix Electronics and suitable for industrial panel meters, test equipment readouts, and automotive diagnostic tools requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD4056BPW 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 industrial, automotive, and consumer electronics.
The CD4056B series belongs to TI's legacy CMOS logic portfolio, engineered for robust, low-power display interfacing in harsh environments where reliability and wide supply tolerance are critical.
FAQ
What is the maximum sink current per segment on the CD4056BPW?
The CD4056BPW guarantees a minimum sink current of 1.5 mA per segment (pins a–g, dp) when VDD = 5 V and VOL ≤ 0.4 V. At VDD = 10 V, sink capability increases to ≥3.5 mA. This allows direct drive of standard low-current LEDs without external current-limiting resistors in most applications.
Does the CD4056BPW support common-anode LED displays?
No, the CD4056BPW is designed exclusively for common-cathode LED displays. Its outputs are open-drain N-channel MOSFETs that sink current to VSS. Driving common-anode displays would require external high-side switches or level-shifting circuitry, which is not supported by the CD4056BPW architecture.
Can the CD4056BPW operate from a 3.3 V supply?
Yes, the CD4056BPW is fully specified to operate from 3 V to 18 V. At 3.3 V, it maintains CMOS-compatible input thresholds and delivers ≥0.5 mA sink current per segment - sufficient for low-current indicator LEDs. Propagation delay increases to ~200 ns, but remains suitable for static or low-frequency multiplexed displays.
What is the function of the BL̅ and LT̅ pins on the CD4056BPW?
The BL̅ (Blank) pin is active-low and forces all segment outputs high (disabling LED conduction) regardless of latch content. The LT̅ (Lamp Test) pin is also active-low and overrides normal decoding to drive all segments (a–g and dp) simultaneously. Both are independent of LE̅ and enable hardware-level display diagnostics and control.
Is the CD4056BPW pin-compatible with other CD405x series devices?
The CD4056BPW shares identical pinout and electrical behavior with CD4056BE (PDIP) and CD4056BF3A (CDIP), differing only in package (TSSOP-16). It is not pin-compatible with CD4054B or CD4055B, which have different output configurations and segment mappings - always verify function and pin assignment against the specific part number's datasheet.
CD4056BPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Display Type:
- LCD
- Configuration:
- 7 Segment
- Interface:
- BCD
- Digits or Characters:
- 1 Digit
- Current - Supply:
- 40 nA
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
CD4056BPW FAQ
1.How can I place an order for CD4056BPW through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4056BPW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD4056BPW reliable?
The price and inventory of CD4056BPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4056BPW is usually 5 days.
3.What payment methods are accepted for CD4056BPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4056BPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4056BPW?
CD4056BPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4056BPW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD4056BPW?
For technical support, including CD4056BPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4056BPW requirements.
6.How does Aetrix verify that CD4056BPW is sourced from the original manufacturer or authorized distributors?
All CD4056BPW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD4056BPW meets industry standards.
7.What is the process for return or replacement of CD4056BPW?
All CD4056BPW units undergo pre-shipment inspection (PSI). If there is an issue with CD4056BPW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD4056BPW part is unused and in its original packaging.
Return procedure for CD4056BPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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