MC14555BF - Dual 1-of-4 CMOS Decoder | onsemi
MPN： MC14555BF ✓ 啟用中MC14555BF 概覽
A decoder or demultiplexer is a combinational logic device that converts a binary selection code into one active output path. The dual architecture provides two independent binary-to-1-of-4 conversion channels in one IC. This hierarchy places the MC14555BF in the CMOS logic family, specifically within decoder and demultiplexer logic ICs used to route control, address, or selection signals.
The principal feature is active-high decoding: the selected output goes to the high state, while the three unselected outputs remain low. Two select inputs permit all four output positions to be addressed. An active-low enable input provides a common control function for disabling the decoding network. The complementary MOS construction supports low-power operation and compatibility with conventional CMOS logic systems.
The MC14555BF combines two complete decoder/demultiplexer functions in one package, reducing component count in designs that require parallel four-way selection. Its 440 ns propagation delay at a 50 pF load provides useful timing guidance for control paths where propagation delay must remain predictable. The 16-pin SOIC package also supports conventional surface-mount assembly and inspection.
Typical uses include four-way control-signal routing, address selection, display or peripheral selection, instrumentation multiplexing, and industrial control logic. Because the device is CMOS and operates from a nominal 5 V supply, it is particularly appropriate for systems using 5 V digital logic levels. The enable input can also support shared bus isolation or synchronized selection in a larger controller.
Design with the active-low enable polarity and active-high output polarity clearly in mind. Confirm the voltage ratings, absolute maximum conditions, output drive capability, and timing limits in the onsemi datasheet before finalizing a new design. Place the device so that switching outputs do not unintentionally drive adjacent high-impedance nodes, and validate fanout against every connected load.
This product page combines the manufacturer function description, package information, timing indications, application guidance, structured specifications, and engineering design notes to accelerate component evaluation. Request current commercial availability and sourcing terms through the Request a Quote form on this page.
直接替換替代品，適用於 MC14555BF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品MC14555BF 最大額定值與電氣特性
| Product Type | Dual binary-to-1-of-4 decoder/demultiplexer |
| Logic Technology | Complementary MOS enhancement mode |
| Decoder Channels | 2 channels |
| Select Inputs per Channel | 2 inputs, A and B |
| Outputs per Channel | 4 mutually exclusive outputs, Q0 to Q3 |
| Enable Input | 1 active-low input per channel |
| Selected Output State | High |
| Unselected Output State | Low |
| Nominal Supply Voltage | 5 V |
| Propagation Delay | 440 ns at 50 pF load |
| 封裝 | SOIC-16 |
| 腳位數 | 16 pins |
| 安裝類型 | Surface mount |
MC14555BF soic-16 腳位配置指南
MC14555BF（soic-16 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MC14555BF.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC14555BF 適用於 6 應用s: Four-Way Control-Signal Routing, Peripheral Address Selection, Instrumentation Multiplexing, Industrial Automation Control, Display and Peripheral Selection, CMOS Logic Control Interface.
Four-Way Control-Signal Routing
The MC14555BF suits four-way control-signal routing because each decoder section converts two select inputs into four mutually exclusive active-high outputs. Use one channel to route an enable, reset, mode, or write command to one of four functional blocks while the other three outputs remain low. The active-low enable input can inhibit decoding when the controlled subsystem is unavailable. Account for the stated 440 ns propagation delay at a 50 pF load when the routed command participates in a timing-critical handshake.
推薦
Peripheral Address Selection
The MC14555BF can decode a two-bit address into one of four active-high peripheral-select outputs. Its two independent decoder channels support paired selection stages in systems that must activate one of four devices at a time. The four outputs within a channel are mutually exclusive, reducing the risk of simultaneous active commands. Confirm that the 16-pin SOIC logic levels and timing are compatible with the peripheral interface, and include the 440 ns delay at 50 pF in address-valid timing.
推薦
Instrumentation Multiplexing
The MC14555BF is useful in instrumentation designs that must route control signals among several analog or measurement channels. Two binary select inputs establish the destination, while the active-low enable provides a common inhibit for measurement setups. Because the selected output changes high and the other outputs remain low, downstream circuitry can use the decoded line as a channel request without multiple outputs being active simultaneously. Validate output drive, loading, and propagation timing against the instrument's control architecture.
推薦
Industrial Automation Control
The MC14555BF provides compact logic for industrial automation modules that distribute commands among actuators, relays, or test stations. A nominal 5 V CMOS implementation fits systems using 5 V digital logic, while the dual decoder configuration can handle two selection banks without adding another IC. The active-low enable may be tied to a safety or subsystem-enable signal so decoded outputs are inactive during transitions. Final qualification must verify temperature limits, noise margins, and timing against the industrial control environment.
推薦
Display and Peripheral Selection
The MC14555BF can decode a compact binary selector into one of four active-high peripheral-enable signals for a display module or mixed-peripheral board. The selected output goes high while the remaining outputs stay low, making the device appropriate for systems that require exclusive enables. Its two decoder sections can manage separate selection groups, and the 16-pin SOIC package simplifies conventional surface-mount assembly. Check fanout and bus contention when several decoded outputs drive control inputs on the same board.
推薦
CMOS Logic Control Interface
The MC14555BF integrates naturally into CMOS logic control interfaces that require decoded, mutually exclusive commands. Its complementary MOS enhancement-mode construction and 5 V nominal operating point suit conventional CMOS control stages. Two channels permit independent selection functions, while the active-low enable inputs can coordinate when each command group is valid. Designers should preserve input and output logic-level compatibility, avoid contention on decoded lines, and include the 440 ns propagation delay at a 50 pF capacitive load in sequencing requirements.
推薦
推薦產品摘要
工程參考資料，適用於 MC14555BF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | SOIC-16 |
| Brand | onsemi |
| Product Type | Dual binary-to-1-of-4 decoder/demultiplexer |
| Decoder Channels | 2 |
| Select Inputs per Channel | 2 |
| Outputs per Channel | 4 |
| Enable Polarity | Active low |
| Selected Output Polarity | Active high |
| Nominal Supply Voltage | 5 V |
| Propagation Delay | 440 ns at 50 pF load |
| Logic Technology | Complementary MOS enhancement mode |
| Pin Count | 16 pins |
主要差異化特點
- Active-high selected outputs (對比MC14556BF)
- Two independent decoder channels in one package (對比MC14555BF)
- Compact 16-pin surface-mount integration (對比MC14556BF)
設計說明
Do not treat the MC14556BF as an interchangeable replacement for the MC14555BF. The MC14555BF drives its selected output high, whereas the MC14556BF drives its selected output low. Although both devices belong to the same decoder family, reversing the selected-output polarity can invert the meaning of enable, reset, write, or select signals. Review the truth table in the onsemi MC14555B datasheet before reusing a circuit across output-polarity variants.
Treat the stated 440 ns propagation delay as a 50 pF-load timing reference, not a fixed delay for every connected circuit. Longer traces, higher capacitance, and additional fanout can change the observed response. Place the decoder near the controlled logic when low command latency matters, keep output routing compact, and check the receiver's input capacitance and setup-time requirements before relying on the selection path for a time-critical protocol.
Assign all 16 SOIC terminals directly from the pin-description table in the onsemi MC14555B datasheet before laying out the PCB. Pay particular attention to the two select inputs, two active-low enable inputs, and eight decoder outputs. Keep decoded outputs away from unrelated high-impedance nets, provide a stable common ground reference, and route the device so its output capacitance remains reasonably close to the 50 pF condition associated with the stated propagation-delay figure.
合規資訊
Detailed environmental and compliance classifications are not stated in the accessible manufacturer information and must be confirmed in the current onsemi product documentation.
