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Texas Instruments CD4555BM
- Part No.:
- CD4555BM
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD4555BM.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,513
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Product details
Overview
CD4555BM from Texas Instruments is a dual 1-of-4 decoder/demultiplexer IC in a 16-pin SOIC package, operating across -55°C to +125°C, with supply voltage range 3 V to 18 V, and propagation delay of 130 ns at 5 V. It functions as a logic-level address decoder in industrial control panels requiring discrete output selection.
For engineers reviewing the CD4555BM datasheet, CD4555BM pinout, CD4555BM application, or CD4555BM equivalent, key selection criteria include its dual independent 1-of-4 decoding capability, wide VDD tolerance, high noise immunity (VIL/VIH thresholds), and compatibility with CMOS/TTL input logic families.
Technical Context
The CD4555BM implements two identical 1-of-4 decoders, each accepting two binary inputs (A0/A1) and an active-low enable (E̅), producing four mutually exclusive active-high outputs (Y0–Y3). Each decoder operates independently with no internal interconnect.
Input logic thresholds are referenced to VDD, enabling stable operation across the full 3–18 V supply range; output drive strength supports fan-out of up to 10 CMOS loads or 2 TTL loads at 5 V, with symmetrical rise/fall times under capacitive load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 1-of-4 decoder/demultiplexer - enables two independent address-to-output mappings per device |
| Supply Voltage Range | 3 V to 18 V - supports direct interface with legacy 5 V, modern 3.3 V, and high-voltage industrial rails |
| Propagation Delay | 130 ns max at VDD = 5 V - ensures timing predictability in synchronous control sequencers |
| Input Thresholds | VIL ≤ 0.33×VDD, VIH ≥ 0.67×VDD - provides robust noise margin across all supply voltages |
| Output Drive | ±4.2 mA at VDD = 15 V - sufficient to directly drive LEDs, small relays, or CMOS/TTL inputs without buffering |
| Operating Temperature | -55°C to +125°C - qualified for extended-temperature industrial and aerospace environments |
Pinout & Package
CD4555BM is housed in a 16-pin SOIC (D) package measuring 10.4 mm × 5.3 mm × 2.0 mm max height, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Decoder 1 outputs Y0–Y3 | Active-high decoded outputs; each drives one of four discrete loads independently |
| 5, 6 | Decoder 1 inputs A0, A1 | Binary address inputs determining which Y output activates when E̅ = LOW |
| 7 | Decoder 1 enable (E̅) | Active-low global enable - disables all Y0–Y3 outputs when HIGH |
| 8 | VSS | Ground reference for both decoders and internal logic |
| 9, 10, 11, 12 | Decoder 2 outputs Y0–Y3 | Second independent set of active-high outputs, electrically isolated from first decoder |
| 13, 14 | Decoder 2 inputs A0, A1 | Separate binary address bus for second decoder - no shared inputs |
| 15 | Decoder 2 enable (E̅) | Independent active-low enable controlling only second decoder's outputs |
| 16 | VDD | Positive supply rail - powers both decoders and defines logic thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Eliminates need for two separate ICs in systems requiring parallel address decoding paths |
| Wide VDD range (3–18 V) | Enables single-part inventory across mixed-voltage designs without level-shifting circuitry |
| CMOS input compatibility | Accepts TTL- and CMOS-level signals without external pull-ups or threshold translation |
| High noise immunity | Guaranteed 33% VDD hysteresis margin prevents false triggering in electrically noisy environments |
| Low quiescent current | Typical IDD = 20 nA at 25°C - suitable for battery-backed or low-power standby modes |
Applications
| Industrial PLC I/O Expansion | Legacy Instrumentation Address Decoding |
|---|---|
Use Scenario: Expanding discrete output points on a programmable logic controller rack using a single CD4555BM to select among four solenoid drivers per channel. IC Role / Device Role / Timing Role: Dual decoder maps two-bit microcontroller port outputs to eight independent 24 V DC load switches via optocouplers. Use Value: Reduces board space by 50% versus discrete 74HC139 implementations while maintaining full temperature range operation. | Use Scenario: Selecting one of four analog multiplexer channels in a 1980s-era data acquisition unit powered from ±15 V rails. IC Role / Device Role / Timing Role: CD4555BM acts as address decoder between 8085 CPU address lines and CD4051 analog switches. Use Value: Maintains compatibility with original design's 15 V supply and timing budget due to 130 ns propagation delay at 15 V. |
| Automotive Body Control Module | Test Equipment Signal Routing |
Use Scenario: Controlling four HVAC damper actuators in a vehicle body control module where ambient temperature swings from -40°C to +105°C. IC Role / Device Role / Timing Role: CD4555BM decodes LIN bus command bits to activate individual H-bridge gate drivers. Use Value: Qualified for -55°C to +125°C operation ensures reliability over full automotive thermal envelope without derating. | Use Scenario: Routing calibration signals to four precision DACs in automated test equipment during self-test sequences. IC Role / Device Role / Timing Role: CD4555BM selects one DAC reference path per test step using synchronized enable strobes. Use Value: Symmetrical rise/fall times (<100 ns at 100 pF) preserve signal integrity during fast switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 1-of-4 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4555BM96 | Same die, identical electrical specs, SOIC-D package with tape-and-reel packaging (2500 pcs/reel) | Designed for automated SMT assembly; same footprint and thermal profile as CD4555BM | Select CD4555BM96 for volume production; CD4555BM is obsolete but may be available in legacy stock |
| CD4555BNSR | Same functionality, SOP-16 (NS) package with 1.27 mm pitch, 8.1 mm width, and 10.4 mm length | Requires PCB land pattern adjustment due to wider body and different pin 1 marking location | Choose CD4555BNSR when SOP footprint is already allocated and higher pin pitch improves solder joint reliability |
Compared with CD4555BM, CD4555BM96 offers identical performance in optimized SMT packaging, while CD4555BNSR provides mechanical differentiation for layout-constrained boards - neither is pin-compatible without footprint revision.
Availability
CD4555BM is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation upgrades, and automotive body electronics requiring stable component supply across extended temperature ranges.
Supply support for CD4555BM 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace qualification.
The CD4555B family belongs to TI's legacy CMOS logic product line, designed specifically for high-reliability, wide-supply-voltage digital decoding in harsh-environment applications where modern low-voltage logic cannot operate.
FAQ
What is the maximum supply voltage rating for CD4555BM?
The CD4555BM supports a maximum supply voltage of 18 V DC, with guaranteed operation across the full 3 V to 18 V range. This allows direct integration into systems using legacy 12 V or 15 V rails without regulation. The CD4555BM maintains specified propagation delay, output drive, and noise immunity throughout this range, as verified in the SCHS087D datasheet.
Does CD4555BM support TTL-level input signals?
Yes, CD4555BM accepts TTL-level inputs directly: at VDD = 5 V, VIH ≥ 3.5 V and VIL ≤ 1.5 V meet standard TTL thresholds. Its input structure is CMOS but designed with compatible voltage margins, eliminating need for level shifters when interfacing with 74LS or 74HC series outputs. This behavior is confirmed in the "DC Electrical Characteristics" table of the CD4555BM datasheet.
Is CD4555BM pin-compatible with CD4555BE (PDIP package)?
No, CD4555BM and CD4555BE share identical pin functions and numbering but differ in physical package: CD4555BM uses SOIC-D (16-pin, 1.27 mm pitch), while CD4555BE uses PDIP-N (16-pin, 2.54 mm pitch). Their footprints are not interchangeable without PCB redesign. Both devices implement the same dual 1-of-4 decoder logic and electrical specifications per the SCHS087D datasheet.
What is the typical quiescent current of CD4555BM at room temperature?
The typical quiescent supply current (IDD) for CD4555BM is 20 nA at 25°C and VDD = 5 V, rising to 100 nA at 125°C. This ultra-low static power enables use in battery-backed systems or always-on monitoring circuits where standby consumption must remain below 1 µA per channel. Values are specified in the "DC Electrical Characteristics" section of the official CD4555BM datasheet.
Can CD4555BM drive LEDs directly without current-limiting resistors?
No, CD4555BM cannot safely drive LEDs directly without external current-limiting resistors. While its outputs source up to 4.2 mA at VDD = 15 V, LED forward voltage and current requirements vary; uncontrolled current risks exceeding absolute maximum output ratings or causing inconsistent brightness. The CD4555BM datasheet specifies output current limits and recommends external resistors sized per LED VF and desired IF - e.g., 1 kΩ for ~5 mA at 5 V.
CD4555BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 4000B
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 6.8mA, 6.8mA
- Voltage Supply Source:
- Dual Supply
- Voltage - Supply:
- 3V ~ 18V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD4555BM FAQ
1.How can I place an order for CD4555BM through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4555BM 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 CD4555BM reliable?
The price and inventory of CD4555BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4555BM is usually 5 days.
3.What payment methods are accepted for CD4555BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4555BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4555BM?
CD4555BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4555BM 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 CD4555BM?
For technical support, including CD4555BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4555BM requirements.
6.How does Aetrix verify that CD4555BM is sourced from the original manufacturer or authorized distributors?
All CD4555BM 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 CD4555BM meets industry standards.
7.What is the process for return or replacement of CD4555BM?
All CD4555BM units undergo pre-shipment inspection (PSI). If there is an issue with CD4555BM, 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 CD4555BM part is unused and in its original packaging.
Return procedure for CD4555BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD4555BM Tags
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SN74HC138DR
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SN74HC138N
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