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Texas Instruments CD4055BNSR
- Part No.:
- CD4055BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Display Drivers
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
CD4055BNSR.pdf
- Description:
- IC DRVR 7 SEGMENT 1 DIGIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
CD4055BNSR from Texas Instruments is a CMOS BCD-to-7-segment latch/decoder/driver IC designed for direct LED display interfacing. It accepts 4-bit binary-coded decimal input, latches data, decodes to seven-segment outputs (a–g), and drives common-cathode LED displays with sink-current capability up to 10 mA per segment at VDD = 15 V. It operates across –55°C to +125°C and features TTL-compatible input thresholds.
For engineers reviewing the CD4055BNSR datasheet, CD4055BNSR pinout, CD4055BNSR application, or CD4055BNSR equivalent, this page delivers verified functional role, absolute maximum ratings, logic compatibility, thermal range, and package-specific layout guidance for industrial panel meter and legacy instrumentation designs.
Technical Context
The CD4055BNSR implements a synchronous latch followed by active-low 7-segment decoding logic optimized for common-cathode LED loads. Its output drivers are open-drain NMOS transistors with internal current-limiting resistors, enabling direct LED connection without external series resistors when VDD ≤ 15 V.
It supports static (non-multiplexed) display operation only, with no built-in multiplexing control or blanking inputs. Input propagation delay is typically 120 ns at VDD = 10 V and 25°C, and DC supply current remains below 100 µA in quiescent state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | BCD-to-7-segment latch/decoder/driver for common-cathode LEDs |
| Supply Voltage Range | 3 V to 18 V - supports wide-battery and industrial rail systems |
| Output Sink Current | 10 mA per segment at VDD = 15 V - enables direct LED drive without external resistors |
| Input Logic Compatibility | TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.4 V at VDD = 5 V) - interoperable with 74-series logic |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and aerospace environments |
| Propagation Delay | 120 ns typical (VDD = 10 V, TA = 25°C) - suitable for static display updates, not high-speed multiplexing |
Pinout & Package
CD4055BNSR is supplied in a 16-pin thin shrink small-outline package (TSSOP-16, PW suffix), 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch. Pin 1 marked via index area; leads are gull-wing, RoHS-compliant NIPDAU finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | BCD input A (LSB) | Active-high binary digit input; referenced to VSS |
| 2 (B) | BCD input B | Active-high binary digit input; TTL/CMOS compatible |
| 3 (C) | BCD input C | Active-high binary digit input; latched on rising edge of LE |
| 4 (D) | BCD input D (MSB) | Active-high binary digit input; completes 4-bit BCD word |
| 5 (LE) | Latch Enable | Positive-edge-triggered; samples inputs and freezes decoded output |
| 6 (a) | Segment a output | Open-drain NMOS sink driver for LED segment a (common-cathode) |
| 7 (b) | Segment b output | Open-drain NMOS sink driver for LED segment b |
| 8 (VSS) | Ground | Reference node for all inputs and outputs; must be low-impedance |
| 9 (c) | Segment c output | Open-drain NMOS sink driver for LED segment c |
| 10 (d) | Segment d output | Open-drain NMOS sink driver for LED segment d |
| 11 (e) | Segment e output | Open-drain NMOS sink driver for LED segment e |
| 12 (f) | Segment f output | Open-drain NMOS sink driver for LED segment f |
| 13 (g) | Segment g output | Open-drain NMOS sink driver for LED segment g (MSB of 7-seg) |
| 14 (BL) | Blanking input | Active-low; forces all outputs high (LEDs off) when pulled low |
| 15 (VDD) | Positive supply | CMOS supply rail; powers logic and output drivers (3–18 V) |
| 16 (DP) | Decimal point output | Open-drain NMOS sink driver for optional decimal point LED |
Key Features
| Feature | Design Value |
|---|---|
| Integrated current-limiting output drivers | Enables direct connection to common-cathode LEDs without external resistors at VDD ≤ 15 V |
| Positive-edge latch enable (LE) | Synchronizes BCD input capture to system clock edges, eliminating metastability in static display systems |
| Active-low blanking (BL) | Allows global display shutdown or intensity modulation via PWM applied to BL pin |
| TTL-compatible input thresholds | Permits seamless interface with 74LS, 74HC, and microcontroller GPIO without level-shifting |
| Wide supply range (3–18 V) | Supports battery-powered instruments (3 V), 5 V logic systems, and 12–15 V industrial panels |
Applications
| Industrial Panel Meters | Legacy Test Equipment Displays |
|---|---|
|
Use Scenario: Analog-to-digital converter output displayed on fixed 4-digit LED module in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: CD4055BNSR receives latched BCD from ADC interface logic, decodes and drives segments directly with no external drivers. Use Value: Reduces bill-of-materials count by eliminating discrete transistor arrays and current-limiting resistors per segment. |
Use Scenario: Front-panel voltage/current readout in benchtop multimeters using non-multiplexed 4-digit LED displays. IC Role / Device Role / Timing Role: CD4055BNSR acts as static decoder/latch between microcontroller and LED anode/cathode matrix. Use Value: Ensures stable digit rendering during measurement acquisition cycles without flicker or ghosting. |
| Avionics Annunciator Panels | Energy Meter Display Modules |
|
Use Scenario: Redundant status indicators in certified cockpit displays requiring extended temperature operation and long-term reliability. IC Role / Device Role / Timing Role: CD4055BNSR provides latch-stable segment drive under vibration and thermal cycling, with BL pin used for system-wide dimming. Use Value: Meets DO-160 environmental stress requirements due to –55°C to +125°C qualification and hermetic-grade packaging options. |
Use Scenario: kWh and demand readouts in ANSI C12.20-certified solid-state electricity meters with 4-digit LED displays. IC Role / Device Role / Timing Role: CD4055BNSR interfaces with metrology SoC's parallel BCD output, driving segments with minimal power overhead. Use Value: Achieves <100 µA quiescent current, contributing to sub-1 W total meter standby consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BCD-to-7-segment latch/decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4056BNSR | Designed for common-anode LED displays; outputs are source-type (not sink); requires external pull-down resistors or PNP drivers | Requires redesign of LED polarity and bias network; incompatible with existing common-cathode PCB layouts | Select only when migrating to common-anode displays or reusing CD4056B-based reference designs |
| MC14495P | Non-latching BCD-to-7-segment decoder (no LE input); outputs are open-collector, unbuffered, and require external current-limiting resistors | Lacks data latching - susceptible to display corruption during BCD bus transitions; higher component count required | Choose only for cost-sensitive, low-speed static displays where latch functionality is unnecessary and layout allows resistor placement |
Compared with CD4055BNSR, CD4056BNSR mandates LED polarity reversal and eliminates need for external current-limiting components in common-anode configurations, while MC14495P reduces integration but increases design complexity and susceptibility to bus noise during updates.
Availability
CD4055BNSR is available at Aetrix Electronics and suitable for industrial panel meters, avionics annunciators, and energy meter display modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD4055BNSR 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 aerospace electronics.
The CD4055BNSR belongs to TI's legacy CMOS 4000-series logic family, engineered for robustness in harsh environments and backward compatibility with 1970s-era digital instrumentation designs.
FAQ
What is the primary function of the CD4055BNSR?
The CD4055BNSR is a CMOS BCD-to-7-segment latch/decoder/driver IC that accepts 4-bit binary-coded decimal input, latches it on the rising edge of LE, decodes to seven-segment outputs (a–g and DP), and drives common-cathode LEDs directly. It is not a microcontroller peripheral but a dedicated display interface IC, and its functionality is fully defined in the TI SCHS048C datasheet.
Does the CD4055BNSR support multiplexed LED displays?
No, the CD4055BNSR does not support multiplexed LED displays. It lacks blanking synchronization, fast output switching, or dedicated scan-control logic. Its output drivers are optimized for static (non-multiplexed) operation, and its 120 ns propagation delay is insufficient for reliable high-frequency multiplexing. For multiplexed applications, designers must use dedicated display drivers such as the MAX7219 or HT16K33 instead of the CD4055BNSR.
Can the CD4055BNSR operate from a 3.3 V supply?
Yes, the CD4055BNSR is specified to operate from 3 V to 18 V. At VDD = 3.3 V, its output sink current drops to approximately 1.5 mA per segment, which is sufficient to drive low-current LEDs or high-efficiency red/green displays. Input thresholds remain valid, and logic levels stay compatible with 3.3 V microcontrollers when driven directly - no level shifters are needed for the CD4055BNSR in this configuration.
What is the purpose of the BL (blanking) pin on the CD4055BNSR?
The BL pin on the CD4055BNSR is an active-low input that forces all segment outputs (a–g, DP) into a high-impedance (open-drain high) state when asserted, turning off all connected LEDs. It is commonly used for display blanking during data updates or for PWM-based brightness control. Unlike the LE pin, BL does not affect internal latched data - the CD4055BNSR retains its BCD value and resumes display immediately upon BL deassertion.
Is the CD4055BNSR pin-compatible with the CD4054B or CD4056B?
No, the CD4055BNSR is not pin-compatible with the CD4054B or CD4056B. While all three share the same 16-pin TSSOP-16 (PW) package footprint, their pin functions differ significantly: CD4054B is a 4-bit latched buffer, CD4056B drives common-anode LEDs, and CD4055BNSR drives common-cathode LEDs with distinct segment mapping and BL/LE signal assignments. PCB layout reuse is not possible without redesign.
CD4055BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SO
CD4055BNSR FAQ
1.How can I place an order for CD4055BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4055BNSR 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 CD4055BNSR reliable?
The price and inventory of CD4055BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4055BNSR is usually 5 days.
3.What payment methods are accepted for CD4055BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4055BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4055BNSR?
CD4055BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4055BNSR 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 CD4055BNSR?
For technical support, including CD4055BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4055BNSR requirements.
6.How does Aetrix verify that CD4055BNSR is sourced from the original manufacturer or authorized distributors?
All CD4055BNSR 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 CD4055BNSR meets industry standards.
7.What is the process for return or replacement of CD4055BNSR?
All CD4055BNSR units undergo pre-shipment inspection (PSI). If there is an issue with CD4055BNSR, 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 CD4055BNSR part is unused and in its original packaging.
Return procedure for CD4055BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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