CD4017AK - 3-12V Decade Counter | Texas Instruments
MPN： CD4017AK ✓ 啟用中CD4017AK 概覽
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.
直接替換替代品，適用於 CD4017AK — 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。
此系列的變體
與下列產品可直接替換的同系列型號： CD4017AK （相同外形與佔位） — 差異在於 Mounting Type, Package.
CD4017BE
✅ 直接替換聯絡詢價
查看資料表 →HEF4017B
✅ 直接替換📋 參考替代品（不在目錄中）
74HC4017
✅ 直接替換📋 參考替代品（不在目錄中）
CD74HC4017
✅ 直接替換📋 參考替代品（不在目錄中）
CD74AC161
✅ 直接替換📋 參考替代品（不在目錄中）
CD4017AK 最大額定值與電氣特性
| 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 |
| 封裝 | 16-CFP |
| 安裝類型 | Surface mount |
CD4017AK 16-cfp 腳位配置指南
CD4017AK（16-cfp 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： CD4017AK.
請參閱 資料表 以查看完整腳位配置。
典型應用
CD4017AK 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 CD4017AK — 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 | 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 |
主要差異化特點
- Directly identified 3 V to 12 V operating range (對比HEF4017B)
- Ten decoded decade outputs for one-hot sequencing (對比CD74AC161)
- Target-specific 16-CFP package identification (對比CD4017B)
設計說明
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.
合規資訊
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.
