MC14556BF Dual 1-of-4 Decoder/Demultiplexer | onsemi
部品番号: MC14556BF ✓ 生産中MC14556BF 概要
A decoder/demultiplexer is a digital logic IC that translates a binary address into one active output. It belongs to the decoder hierarchy within combinational logic, interface ICs, and broader semiconductor products. In demultiplexer mode, the MC14556BF routes one selected output according to the A and B inputs. The active-low Enable input provides a common gating function, allowing the selected path to be disabled without changing the select state.
The verified device information identifies complementary MOS enhancement-mode construction, two select inputs, one active-low Enable input, and four mutually exclusive outputs labeled Q2 and Q3 within the family description. Its specified temperature grade is military, and the package is described as a rectangular gull-wing SOP with 16 terminals. These characteristics place it in applications that require compact binary decoding alongside conventional through-hole-era logic-package compatibility.
Typical uses include selecting one of four peripheral sections, decoding a two-bit control address, separating mutually exclusive commands, and directing a shared signal toward one of four destinations. Because the outputs are mutually exclusive, the active output provides a straightforward way to convert a two-bit binary value into a one-of-four selection without implementing individual Boolean gates at the system level.
When laying out a board, place the device near the signals it decodes and route each output according to its assigned destination. Maintain a common ground reference with the controlling logic and connected circuits. Treat all unused inputs according to the manufacturer logic truth table, and do not infer active levels or output polarity from the output names alone. Review the pin-description and truth-table sections in the manufacturer datasheet before finalizing PCB nets.
This page consolidates the device identity, package information, decoder architecture, sourcing workflow, comparison framework, and practical design considerations. It also distinguishes documented facts from parameters that require direct confirmation from the manufacturer datasheet, helping engineers plan a review of the MC14556BF without relying on incomplete distributor summaries.
ドロップイン代替品: MC14556BF — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストMC14556BF 最大定格＆電気的特性
| Product Type | Dual binary to 1-of-4 decoder/demultiplexer |
| Logic Family | Complementary MOS (CMOS) enhancement-mode devices |
| Decoder Sections | 2 sections |
| Select Inputs per Section | 2 inputs: A and B |
| Enable Input | 1 active-low Enable input |
| Outputs | 4 mutually exclusive outputs |
| Output Labels | Q2 and Q3 identified in the family description |
| Package Type | SOP with gull-wing leads |
| Package Shape | Rectangular |
| Terminal Count | 16 terminals |
| 実装タイプ | Surface mount |
| Temperature Grade | Military |
MC14556BF rectangular ピン配置ガイド
MC14556BF (rectangular パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: MC14556BF.
詳細は データシート をご参照ください。
主な用途
MC14556BF の用途: 6 件s: Binary Peripheral Address Decoding, One-of-Four Signal Routing, Chip-Select Generation, Industrial Control Command Selection, Test and Measurement Address Control, Multiplexed Control Interface.
Binary Peripheral Address Decoding
The MC14556BF is suitable for decoding a two-bit address into one of four mutually exclusive selections. Each decoder section can use its A and B select inputs to represent four address combinations, while the active-low Enable input permits the selected path to be gated by an external control condition. This approach is useful when a system must select one of four peripheral sections without reproducing the Boolean decoding network in discrete gates. Before implementation, confirm the complete numbered pinout, output polarity, supply range, and propagation delay from the manufacturer datasheet, then assign each decoded output only to the intended destination.
おすすめ
One-of-Four Signal Routing
The MC14556BF can function as a two-bit, one-of-four demultiplexer for routing a command or control signal toward one of four destinations. The A and B inputs establish the selected path, and the mutually exclusive outputs prevent intentional activation of more than one destination. This arrangement can simplify control distribution in equipment with multiple addressed subcircuits. The design must respect the output enable state, account for signal direction and voltage levels, and keep inactive outputs in the state required by the downstream circuitry. Confirm the exact output truth table and electrical drive capability in the onsemi datasheet.
おすすめ
Chip-Select Generation
The MC14556BF can generate mutually exclusive chip-select signals for a four-device or four-section interface. Two select bits supplied by a bus controller determine which output is activated, and the active-low Enable input provides a common qualification path for the decoding function. This can reduce repetitive decoding logic while keeping the generated selection signals centralized in one 16-terminal device. Validate timing against the receiving devices, ensure all unused inputs are handled according to the logic truth table, and confirm that the output voltage and rise/fall characteristics meet the interface requirements.
おすすめ
Industrial Control Command Selection
The MC14556BF can decode a compact command word into one active actuator, relay-control, or subsystem-enable signal in industrial equipment. Its military temperature grade may suit harsh applications, but the designer must verify the exact operating-temperature and supply limits from the manufacturer datasheet. The two select inputs support four mutually exclusive commands, while Enable can suppress selection during initialization or fault conditions. Keep the logic supply and ground aligned with the controlled circuitry, provide appropriate decoupling, and review output rise and fall times before driving longer control nets.
おすすめ
Test and Measurement Address Control
The MC14556BF is applicable when an instrument needs to route a measurement or control function to one of four internal channels. A two-bit code can select the desired channel, and the mutually exclusive outputs can enable one downstream measurement path at a time. This reduces the amount of discrete decoding logic while retaining a compact 16-terminal package. Confirm whether the required unselected-output behavior, signal levels, and switching timing meet the instrument architecture. The manufacturer truth table should be used to validate transitions and the behavior of the active-low Enable input.
おすすめ
Multiplexed Control Interface
The MC14556BF can support a multiplexed control interface by allowing two address bits to choose one of four control destinations. The common active-low Enable input adds another level of command gating, which is useful during reset, calibration, or maintenance states. The implementation should account for signal contention if multiple decoder sections drive shared resources, and it should preserve a defined state when Enable is deasserted. Use the manufacturer's pin-description table to identify every output and follow the stated truth table rather than inferring pin behavior from device naming.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MC14556BF — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 |
|---|---|
| Package | 16-terminal rectangular gull-wing SOP |
| Brand | onsemi |
| Device Type | Dual binary to 1-of-4 decoder/demultiplexer |
| Decoder Sections | 2 sections |
| Select Inputs | 2 per section: A and B |
| Enable Input | Active low |
| Outputs | 4 mutually exclusive outputs per section |
| Logic Construction | CMOS enhancement-mode devices |
| Temperature Grade | Military |
| Mounting Type | Surface mount |
| Terminal Count | 16 terminals |
主な差別化要因
- Two decoding functions in one package （vs MC14556B)
- Documented military temperature grade （vs MC14556B)
- Mutually exclusive four-output decoding （vs MC14556B)
設計ノート
Use the manufacturer package drawing for the exact MC14556BF footprint rather than deriving the land pattern from the generic description of a 16-terminal gull-wing SOP. Confirm pin numbering, lead pitch, body dimensions, exposed thermal features if any, and recommended land geometry. The device listing establishes the terminal count and lead form, but it does not reproduce the dimensions required for fabrication.
Assign the A and B select inputs so that only one binary combination changes during normal operation where possible. This limits simultaneous switching on the decoded outputs and reduces avoidable dynamic transitions. Check propagation delay and output transition limits from the datasheet, keep the decoder close to the controlled logic, and avoid routing decoded outputs beneath noisy sources when they trigger clocked or power-management devices.
Do not infer output polarity, disabled-state behavior, or enable timing from the names Q2 and Q3. Review the complete truth table and timing diagram in the manufacturer datasheet, including the state of every output when Enable is high. Also verify how unused select or enable pins are handled. A functional decoder match is not enough to authorize a substitution unless the numbered pinout and electrical limits also match.
Confirm the supported supply-voltage range, quiescent current, and output-drive limits before designing the logic rail. Place the required bypass capacitor close to the supply and ground pins according to the manufacturer layout guidance. The exact capacitor value and supply topology are not established by the distributor summary, so they must come from the datasheet or an evaluated reference design rather than a generic value.
コンプライアンス情報
The manufacturer datasheet and product ordering information must be reviewed for environmental, material, and automotive qualification declarations. The military temperature grade does not by itself establish AEC-Q100 qualification, RoHS compliance, or REACH compliance.
