CD4017AD - 5MHz CMOS Decade Counter | Harris Corporation
MPN： CD4017AD ✓ 啟用中CD4017AD 概覽
A CMOS decade counter is a sequential logic device that advances through ten count states on each clock cycle and provides one decoded output for every state. This makes the CD4017AD useful for translating a clock into a repeating ten-step sequence without requiring a microcontroller, decoder IC, or software. In the broader semiconductor hierarchy, it belongs to the CMOS logic family and the counter/divider category of integrated circuits.
The primary operating characteristics are a 3 V to 12 V supply range, a maximum count frequency of 5 MHz, and a listed power dissipation of 500 mW. Its rising-edge clock input makes each clock transition advance the counter, while the reset function establishes a known starting state. The -55°C to +125°C temperature range supports industrial and extended-temperature equipment where reliable operation is required across a broad ambient range.
The CD4017AD combines a binary counting section with decoded decade outputs. Each decoded output can serve as a separate timing or sequencing signal, and the carry output allows additional counting stages to be cascaded when more than ten states are required. Because it is implemented with CMOS logic, the device is suitable for low-voltage digital systems that need deterministic decade sequencing, although timing margins should be checked against the clock source and supply voltage.
Typical uses include ten-step LED sequencing, industrial relay-cycle controllers, timing dividers, automotive lamp-cycle logic, digital test systems, and clocked sequence generators. The 5 MHz count capability provides ample margin for many low-frequency sequencing tasks while also supporting faster timing applications when propagation delay and output-rise requirements are satisfied.
For reliable implementation, use a clean clock signal with rise and fall times compatible with CMOS inputs, place decoupling capacitors close to the supply pins, and connect unused inputs to a defined logic level. Account for the difference between the 12 V maximum supply rating and the 5 MHz operating point, because maximum clock frequency normally decreases as supply voltage falls.
This page combines the CD4017AD operating specifications, pin-compatible alternatives, application guidance, and design notes to support component selection and PCB implementation. It also distinguishes the ceramic CDIP-16 CD4017AD from parts that provide similar counter functions but use a different package or pin assignment.
直接替換替代品，適用於 CD4017AD — 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： CD4017AD （相同外形與佔位） — 差異在於 Logic Family, Package, RoHS Status.
CD4017BE
✅ 直接替換聯絡詢價
查看資料表 →CD4017BH
✅ 直接替換📋 參考替代品（不在目錄中）
MC14017B
✅ 直接替換📋 參考替代品（不在目錄中）
HEF4017B
✅ 直接替換📋 參考替代品（不在目錄中）
CD4017AD 最大額定值與電氣特性
| Manufacturer | Harris Corporation |
| Product Type | CMOS decade counter and divider |
| Logic Family | CD4000 CMOS |
| Supply Voltage Range | 3 V to 12 V |
| Maximum Count Frequency | 5 MHz |
| 工作溫度範圍 | -55°C to +125°C |
| Power Dissipation | 500 mW |
| Counting Edge | Rising edge |
| Counting Mode | Synchronous counting |
| Division Function | Divide-by-10 |
| Reset Function | Yes |
| Static Operation | Supported |
| 封裝 | CDIP-16 |
| 腳位數 | 16 pins |
| 安裝類型 | Through-hole |
| RoHS 狀態 | Compliant |
| Output Count | 10 decoded outputs |
| Datasheet Page Count | 14 pages |
CD4017AD cdip-16 腳位配置指南
CD4017AD（cdip-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： CD4017AD.
請參閱 資料表 以查看完整腳位配置。
典型應用
CD4017AD 適用於 6 應用s: Ten-Step LED Sequencing, Industrial Relay Cycle Control, Automotive Lamp Sequencing, Digital Test Sequence Generation, Timing Divider and Frequency Synthesis, Clocked Sequence Generator.
Ten-Step LED Sequencing
The CD4017AD fits ten-step LED sequencing because its decoded decade outputs provide one active state for each count position while the rising-edge clock establishes the sequence rate. With a 3 V to 12 V operating range and a listed 5 MHz maximum count frequency, the counter can serve simple display and indicator circuits well above typical visual timing rates. Connect the decoded outputs through suitable current-limiting and transistor driver stages rather than driving high-current LEDs directly. The reset input should initialize the sequence after power-up, while a clock oscillator sets the cadence. For a CDIP-16 through-hole design, check every output’s load and ensure the external drivers remain compatible with the counter’s output characteristics.
推薦
Industrial Relay Cycle Control
The CD4017AD is useful for relay-cycle control because it converts a periodic clock into ten discrete timing positions without requiring embedded software. Each decoded output can select a different actuation interval, allowing a controller to distribute cycles among motors, heaters, valves, or indicators. Its 3 V to 12 V supply range supports common industrial control voltages, and the -55°C to +125°C specification supports extended-temperature equipment. Use the reset function to establish a known starting state after power restoration. Relay coils should be driven through suitable transistors or driver interfaces, with flyback protection across inductive loads. The 5 MHz maximum count frequency provides substantial timing headroom, while the actual usable clock rate should respect supply voltage and load conditions.
推薦
Automotive Lamp Sequencing
The CD4017AD can implement deterministic lamp or warning-indicator sequences in automotive and industrial control systems. Its ten decoded states support repeating patterns, while the carry output permits longer sequences when counter stages are cascaded. The listed -55°C to +125°C operating range is particularly useful for harsh environments, and the 3 V to 12 V supply range simplifies integration with compatible low-voltage control circuitry. Automotive designs must still verify the exact qualification status of the ordering code and all external component ratings. Automotive LED and lamp loads generally need transistor drivers because the counter outputs are intended for logic-level interfacing. Add suitable transient protection and validate the complete circuit across the required temperature range.
推薦
Digital Test Sequence Generation
The CD4017AD can generate repeatable ten-state test sequences in bench fixtures and automated test equipment. A programmable clock supplies the advance rate, while the ten decoded outputs select test channels, fixture positions, or measurement phases. The listed 5 MHz count frequency allows the counter to follow relatively fast test clocks, although output timing must be checked against the actual supply voltage and load. Because the device operates from 3 V to 12 V, it can sit near a mixed-signal test fixture without requiring a high-voltage supply. Use the reset input for repeatable initialization between test runs, and account for the reset pulse requirements in the fixture controller. The CDIP-16 package also supports conventional through-hole prototyping and replacement.
推薦
Timing Divider and Frequency Synthesis
The CD4017AD fits divider applications that need a decade count stage and decoded state information. Its carry output provides a divide-by-10 signal, and cascaded stages can extend the division factor beyond one decade. The 3 V to 12 V supply range allows operation from low-voltage digital rails, while the 5 MHz count frequency supports clock signals well above ordinary timing requirements. When using the device purely as a divider, choose a clock source with clean transitions and verify the maximum operating frequency at the selected supply voltage. The reset function can initialize the count chain, but asynchronous release of reset must not race the clock. For designs needing adjustable division factors, combine the counter with programmable clock generation or additional control logic.
推薦
Clocked Sequence Generator
The CD4017AD implements a clocked sequence generator using its ten decoded outputs and carry output. A free-running oscillator advances the counter, and each decoded output marks a different phase of the repeating sequence. This arrangement is useful in cyclic controllers, teaching equipment, timing panels, and process-control interfaces where a fixed ten-state pattern is sufficient. The 3 V to 12 V supply range and 5 MHz maximum count frequency provide broad operating flexibility, while the -55°C to +125°C range supports extended-temperature installations. Keep the clock edge clean, observe power-up reset behavior, and use latches if the downstream system requires outputs to remain stable while the counter advances. CMOS input unused by the selected sequence should be tied to a defined logic level.
推薦
推薦產品摘要
工程參考資料，適用於 CD4017AD — 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 | CD4017BE | CD4017BH | MC14017B | HEF4017B | CD4017B |
|---|---|---|---|---|---|---|
| Package | CDIP-16 | CDIP-16 | CDIP-16 | CDIP-16 | CDIP-16 | CDIP-16 |
| Brand | Harris Corporation | Texas Instruments | Texas Instruments | onsemi | NXP Semiconductors | Texas Instruments |
| Product Function | CMOS decade counter and divider | CMOS decade counter and divider | CMOS decade counter and divider | CMOS decade counter and divider | CMOS decade counter and divider | CMOS decade counter and divider |
| Decoded Outputs | 10 outputs | 10 outputs | 10 outputs | 10 outputs | 10 outputs | 10 outputs |
| Mounting Type | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole |
主要差異化特點
- Exact Harris Corporation CD4017AD ordering configuration (對比CD4017B)
- Extended-temperature operation (對比CD4017BE)
- Direct decade-state decoding (對比CD4020BK)
- Through-hole ceramic-package construction (對比MC14017B)
設計說明
Place a local supply bypass capacitor close to the CD4017AD power pins and route the return directly to the device ground. Decoupling helps suppress switching transients that could disturb the decade count. Because the component operates from 3 V to 12 V, verify that every connected circuit uses compatible CMOS logic levels. Do not allow a 12 V supply to remain connected when the surrounding interface operates at a lower voltage.
Initialize the counter with a properly timed reset pulse so that operation does not begin from an unknown count state. The reset control must meet the logic-level and pulse-width requirements in the manufacturer CD4017 datasheet. Also keep the clock signal clean and account for the supply-dependent maximum operating frequency; the 5 MHz figure is the stated upper point, not a guarantee at every voltage, temperature, or output-load condition.
Assign signals from the CDIP-16 package drawing rather than from a generic CD4017 diagram. Route the clock and reset traces away from inductive or high-current switching paths, and provide a direct ground reference to the bypass capacitor. If decoded outputs drive relays, lamps, or motors, place transistor and protection networks near the loads while keeping high-current return currents out of the counter's ground path.
Clocked counter outputs can create fast edges even when the intended sequence is slow. Keep external output loads moderate, place output-driver transistors close to their loads, and add protection networks where cables or long PCB traces are present. A slow external clock and clean supply return reduce edge-current loops and limit both radiated noise and susceptibility to false clocking in nearby digital circuitry.
合規資訊
The component listing identifies the CD4017AD as RoHS compliant. No additional environmental or automotive qualification claims should be made without the manufacturer declaration for the exact ordering code.
