CD4017AK - 3-12V Decade Counter | Texas Instruments
部品番号: CD4017AK ✓ 生産中CD4017AK 概要
A decade counter is a sequential digital logic circuit that cycles through ten stable states before repeating. A CMOS decade counter belongs to the logic IC and counter-divider hierarchy, combining flip-flop and decoding logic in one integrated device. It is useful when a system must divide a repetitive input frequency, distribute timing phases, or step through a fixed sequence without requiring a programmable processor.
The CD4017AK accepts a supply voltage from 3 V to 12 V, allowing operation from common low-voltage rails. Its ten decoded outputs provide a one-hot indication of the current count, while the carry output supports extension into additional decades. Clock inhibit provides a way to pause counting, and the master reset input provides a deterministic starting state. These control functions make the counter useful beyond simple frequency division.
Internally, the counter advances on the falling clock edge identified in the CD4017 family documentation. The output decoder turns the counter state into ten separate active-high signals. Because the decoded output remains associated with one count state at a time, a design can drive indicator lamps, multiplexed displays, sequencing controls, or discrete logic gates without decoding the internal state externally. Cascade and reset timing should be checked against the slowest propagation path in the intended system.
Typical applications include decade frequency dividers, stepper-motor position sequencing, timing-pattern generators, display-multiplexing counters, programmable timers, and small automation or test systems. Multiple CD4017AK devices can be chained so that one counter advances another when the first completes a ten-step sequence. Cascading is especially useful when more than ten distinct time slots or decimal positions are required.
When laying out the circuit, keep the clock and reset paths away from sensitive analog nodes and use a defined reset strategy for power-up. Unused decade outputs should not be left driving loads that could create unnecessary switching activity. The 16-CFP package also requires inspection of land-pattern dimensions and solderability requirements before a surface-mount assembly is released.
This page combines the verified component identity, package information, price-evidence status, replacement guidance, and practical counter-design considerations into one engineering reference. It also distinguishes documented drop-in options from broader CD4000-family alternatives so that footprint and electrical compatibility are reviewed before design substitution.
ドロップイン代替品: CD4017AK — 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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: CD4017AK （同一形状・フットプリント） — 相違点: Mounting Type, Package.
CD4017BE
✅ ドロップイン価格はお問い合わせください
データシートを見る →HEF4017B
✅ ドロップイン📋 参考代替品（カタログ未掲載）
74HC4017
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CD74HC4017
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CD74AC161
✅ ドロップイン📋 参考代替品（カタログ未掲載）
CD4017AK 最大定格＆電気的特性
| Product Type | CMOS decade counter and divider |
| Supply Voltage Range | 3 V to 12 V |
| Counter Configuration | 1 element, 10 bit |
| Counting Sequence | Decade, 0 through 9 |
| Clock Edge | Falling edge |
| Logic Levels | Positive and negative |
| Decoded Outputs | 10 outputs |
| Cascade Outputs | 1 carry output |
| パッケージ | 16-CFP |
| 実装タイプ | Surface mount |
CD4017AK 16-cfp ピン配置ガイド
CD4017AK (16-cfp 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: CD4017AK.
詳細は データシート をご参照ください。
主な用途
CD4017AK の用途: 6 件s: Decade Frequency Divider, Step-Sequence Controller, Display Multiplexing Counter, Programmable Timer, Multi-Decade Counter, Automated Test Sequence.
Decade Frequency Divider
The CD4017AK divides a repetitive clock into ten sequential output states, with Q0 through Q9 corresponding to successive count positions. A 3 V to 12 V operating range supports both low-voltage logic and 12 V systems, while the carry output allows another counter to advance after the tenth state. This arrangement is useful when a controller needs ten evenly spaced timing phases rather than a continuously variable frequency. Before implementation, verify the maximum clock frequency, propagation delay, and output transition timing against the operating clock. Pay particular attention to the falling-edge counting behavior so the receiving logic samples outputs at stable times rather than immediately after a clock transition.
おすすめ
Step-Sequence Controller
The ten decoded outputs of the CD4017AK can drive a sequence of gates, indicators, relays, or stepper-control stages, with only one decade output active for each count state. Its falling-edge clock behavior and master-reset input allow deterministic indexing of a multi-step process. Because the CD4017AK operates across 3 V to 12 V, it can be placed close to the controlled load rather than at a distant central controller. Confirm that each output's drive current and voltage limits suit the connected stage, and add buffer transistors where relay coils or other inductive loads exceed the IC's output capability.
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Display Multiplexing Counter
A CD4017AK can generate the one-of-ten selection signals used to multiplex indicators or simplify decimal-display addressing. The ten decoded outputs provide a hardware-generated position code, reducing the number of output pins required by a controller. Its 3 V to 12 V supply range makes it suitable for mixed-voltage logic systems, although the display drivers and their interfaces must match the selected voltage domain. Use the reset input to establish a known starting digit, and verify that display blanking can be derived from the count state without producing an unintended visible pattern during clock or reset transitions.
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Programmable Timer
By combining the CD4017AK's decade counter with external resistor-capacitor timing and gating circuitry, a design can create repetitive time slots or delayed stages. The carry output provides a natural boundary between ten-step timing groups, while the master reset returns the sequence to its starting condition. The 3 V to 12 V operating range permits use in several industrial and embedded control voltage ranges. Timing accuracy depends on the external clock source and component tolerances rather than the counter alone, so use a stable oscillator when precise intervals are required and verify reset recovery before the next clock edge.
おすすめ
Multi-Decade Counter
Cascading CD4017AK devices creates a counter with more than ten positions: the carry output of one counter clocks the next stage, allowing the pair to represent 00 through 99. This is useful for elapsed-cycle counting, event indexing, and sequential test systems that need a compact hardware counter rather than a microcontroller register. The falling-edge clock behavior must remain consistent across the cascade, and propagation delays should be checked so each stage settles before it is sampled. Supply all cascaded devices from the same rail unless their interface specifications explicitly support level translation.
おすすめ
Automated Test Sequence
The decoded decade outputs can select test points, relay paths, or measurement channels in a repeating inspection sequence. Each of the ten Q outputs identifies one test stage, while the carry output can trigger an additional group or indicate completion. The CD4017AK's 3 V to 12 V supply range supports integration with industrial logic, and its reset input provides a repeatable start position for every test cycle. Keep clock and reset wiring away from sensitive analog and measurement nodes, and use isolation or level shifting where a driven fixture uses voltages or thresholds outside the counter's electrical limits.
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おすすめ製品の概要
エンジニアリング参考データ: CD4017AK — 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 | CD4017B | HEF4017B | 74HC4017 | CD74HC4017 | CD74AC161 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | NXP Semiconductors | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-CFP | 16-CFP | 16-CFP | 16-CFP | 16-CFP | 16-CFP |
| Function | Decade counter and divider with 10 decoded outputs | Decade counter and divider | Decade counter and divider | Decade counter and divider | Decade counter and divider | Synchronous 4-bit binary counter |
| Logic Family | CMOS CD4000 | CMOS CD4000 | CMOS CD4000 | CMOS HC | CMOS HC | CMOS AC |
主な差別化要因
- Directly identified 3 V to 12 V operating range （vs HEF4017B)
- Ten decoded decade outputs for one-hot sequencing （vs CD74AC161)
- Target-specific 16-CFP package identification （vs CD4017B)
設計ノート
Do not treat every CD4017-family base number as a mechanical substitute for CD4017AK. The suffix identifies the orderable package, and the target is identified as a 16-CFP surface-mount component. Before release, compare the exact manufacturer land pattern, pin numbering, exposed or non-exposed construction, supply range, clock edge, propagation delay, and output-current limits. A functional match at the logic level is not sufficient if the footprint or timing differs.
The CD4017AK advances on the falling clock edge, so route the clock as a short, clean signal and avoid slow or ringing transitions near the active edge. If a mechanical switch or long cable drives the clock, add suitable debouncing and conditioning rather than relying on the counter input to reject contact bounce. The master-reset path should also be short and deterministic so power-up recovery does not create an unintended decoded output sequence.
Use the manufacturer 16-CFP land pattern and pin table for PCB construction, and verify solder mask, paste, reflow profile, and package tolerances with the assembly process. The lack of an exposed thermal pad means thermal performance depends primarily on copper routing and ambient conditions. Keep unused Q outputs unloaded where practical, and place any external output buffers close to high-current loads rather than routing substantial load current through the counter.
コンプライアンス情報
The web results do not state the requested compliance statuses for CD4017AK. AEC-Q100 is recorded as not applicable because this is a general-purpose logic IC rather than an automotive-qualified device.
