CD4020BE - 14-Bit Ripple-Carry Counter | Texas Instruments
부품 번호: CD4020BE ✓ 활성CD4020BE 개요
A ripple-carry binary counter is a type of sequential logic circuit that advances a binary count after each active clock edge. Its stages are connected in cascade, so propagation delay accumulates across the counter. This makes the CD4020BE suitable for simple divide-by-2^n and divide-by-2^(n+1) arrangements when the required output is the logical counter state rather than a high-speed synchronous binary word. The CMOS implementation places the device within the broader hierarchy of counter IC, digital logic IC, and semiconductor categories.
The verified CD4020BE features include a single 14-bit counter element, negative-edge operation, 12 buffered outputs identified in the supplied comparison data, and a 16-PDIP package. The counter uses master-slave stages, helping prevent output changes while the clock is at its active level. Its divide-by-two output arrangement enables cascaded frequency division without requiring a separate binary-to-binary divider.
The ripple architecture makes each successive output change after the clock transition because the carry propagates through the internal flip-flops. Designers should therefore use the appropriate decoded or single-stage output rather than treating Q13 and Q0 as a simultaneously updated binary bus. The package's through-hole format also supports prototyping, educational instruments, industrial control systems, and repair applications where PCB access and hand soldering are important.
Typical uses include divide-by-16 or divide-by-4096 clock generation, periodic timer references, digital frequency division, industrial sequence counters, and embedded control logic. Because the counter responds to the negative clock edge, the source waveform, reset timing, and any downstream decoder must be checked to avoid counting an unintended transition.
When laying out a new design, route the clock away from sensitive analog nodes and provide a clean return path. For reliable reset release, ensure the reset signal is inactive before the first intended clock edge. If the application requires simultaneous binary updates, a synchronous counter should be considered because ripple propagation delay can create intermediate output states.
This page consolidates verified distributor information, pin-compatible counter alternatives, parameter comparisons, and practical design guidance. It helps engineers distinguish the CD4020BE from positive-edge counters and non-pin-compatible divider functions before committing to a PCB or production order.
드롭인 대체품: CD4020BE — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
HEF4020BP
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
HCF4020BE
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC14020B
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
CD4020BC
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
CD4020BE
✅ 드롭인가격 문의
데이터시트 보기 →CD4020BE 최대 정격 & 전기적 특성
| Counter Type | Binary ripple-carry counter and divider |
| Logic Family | CMOS |
| Number of Counter Elements | 1 element |
| Number of Counter Stages | 14 stages |
| Counting Edge | Negative edge |
| Clock Input | CP |
| Reset Input | Active-high master reset |
| Buffered Outputs | 12 outputs |
| Maximum Count | 16,383 decimal |
| Package Type | 16-PDIP |
| 실장 유형 | Through-hole |
CD4020BE 16-pdip 핀 구성 가이드
CD4020BE(16-pdip 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: CD4020BE.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
CD4020BE 적합 용도: 6 애플리케이션s: Clock Frequency Division, Industrial Sequence Counter, Periodic Timer Reference, Digital Frequency Divider, Educational Counter Logic, Legacy Control-System Repair.
Clock Frequency Division
The CD4020BE fits clock-frequency division because it is a 14-stage ripple-carry binary counter that advances on each negative clock transition. Each available counter stage provides a power-of-two division relationship to the input clock, allowing a design to obtain slower timing references without adding a separate divider IC. In a 16-PDIP package, it also supports through-hole construction and straightforward replacement on legacy control boards. The principal engineering trade-off is accumulated ripple delay through later stages, so the output used by the next circuit should be selected according to the required division ratio and timing margin.
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Industrial Sequence Counter
The Texas Instruments CD4020BE is appropriate for basic industrial sequence counting where a negative-edge clock represents an event or processed pulse. Its 14-stage binary architecture supplies multiple count positions, while the active-high master reset provides a direct way to return the count to zero before a new sequence. The verified distributor listing confirms the 14-bit, one-element counter configuration and 16-PDIP package. In a factory-control application, engineers should debounce the source signal externally if it is mechanical and should treat the counter outputs as ripple signals rather than a simultaneously updated binary bus.
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Periodic Timer Reference
A CD4020BE can create a periodic timer reference by applying a regular clock and selecting a divided counter output. The confirmed 14 counter stages offer multiple divide-by-two choices, and the master-slave configuration supports stable operation from a clean periodic input. This makes the device useful in test equipment, appliance controls, and laboratory timing modules where a low-frequency service signal is needed. The key design consideration is timing accuracy: oscillator tolerance, input jitter, supply behavior, and ripple propagation can affect the final reference, so the clock source should meet the application's timing requirements.
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Digital Frequency Divider
The CD4020BE serves as a dedicated digital frequency divider when one frequency must be reduced to a predictable lower frequency. Its verified negative-edge clock behavior and 14-stage binary counter structure allow cascading of divide-by-two functions within one package. That feature is useful in motor-control timing, display refresh sequencing, and embedded legacy control systems. Compared with a switching divider with programmable output, the CD4020BE provides a simple fixed power-of-two selection with fewer control signals, but it requires careful timing analysis because the ripple architecture introduces stage-to-stage propagation delay.
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Educational Counter Logic
The CD4020BE is well suited to educational demonstrations of sequential logic because its counter stages and clock edge can be observed with ordinary test equipment. The verified datasheet excerpts describe a CMOS ripple-carry counter with master-slave stages, while the 16-PDIP format exposes the clock, reset, and buffered outputs for breadboard or through-hole prototyping. Students can observe how each divide-by-two stage follows the preceding stage and how reset clears the count. A laboratory design should still respect the manufacturer's absolute maximum ratings and unused-input requirements from the complete datasheet.
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Legacy Control-System Repair
The CD4020BE is useful for repairing or extending older CMOS control systems that originally used a 14-stage negative-edge ripple counter in a 16-pin DIP. Its through-hole package and established distributor availability make it practical for board-level replacement in equipment designed around leaded logic. The verified TI and distributor results identify the device as a 14-bit CMOS counter with negative-edge operation and an active-high master reset. Before substituting another manufacturer's equivalent, verify the physical pin orientation, clock edge, reset polarity, output-stage availability, supply range, and propagation timing against the original schematic.
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추천 제품 요약
엔지니어링 참조 데이터: CD4020BE — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | HEF4020BP | HCF4020BE | MC14020B | CD4020BC | CD4020BE |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | NXP Semiconductors | onsemi | onsemi | Toshiba | Semiconductor Components Industries |
| Package | 16-PDIP | 16-PDIP - same package | 16-PDIP - same package | 16-PDIP - same package | 16-PDIP - same package | 16-PDIP - same package |
| Counter Type | Binary ripple-carry counter and divider | 14-stage binary counter | 14-stage ripple-carry counter | 14-stage binary counter and divider | 14-stage binary counter and divider | 14-stage binary counter and divider |
| Number of Counter Stages | 14 stages | 14 stages | 14 stages | 14 stages | 14 stages | 14 stages |
| Counting Edge | Negative edge | High-to-low transition | Negative edge | Negative edge | Negative edge | Negative edge |
주요 차별점
- Original Texas Instruments sourcing (vs HEF4020BP)
- Confirmed negative-edge counting (vs CD4020BC)
- Fully documented 12-output arrangement in the supplied comparison data (vs MC14020B)
설계 노트
Treat the CD4020BE outputs as ripple signals rather than a simultaneously updated binary bus. The verified datasheet description identifies a ripple-carry architecture, so later stages change only after propagation through preceding stages. Use the earliest output available for the required divide ratio, avoid sampling several outputs without accounting for intermediate states, and preserve adequate setup and hold time at any downstream latch.
Confirm the clock edge before replacing the device. The CD4020BE advances on the high-to-low transition, so a circuit that expects a positive-edge counter will behave differently even if the package and stage count match. Also verify the active-high master-reset polarity. An incorrect reset level can hold every counter output low continuously, while an incorrectly timed reset pulse can cause an unwanted count immediately after release.
When replacing the component, match the DIP outline, row spacing, and pin-1 orientation to the original board rather than relying only on the family name. The verified package is 16-PDIP, but package drawings and notch or pin-1 conventions must still be checked. Keep the clock trace away from high-impedance or analog input nodes and provide a direct ground return where practical to reduce coupling into the counter's supply rails.
Do not infer the allowable supply range from generic CD4000-series knowledge. The supplied excerpts do not include the CD4020BE's numerical voltage and current limits, so use the manufacturer datasheet to establish the operating envelope and unused-input states. This is especially important during repair work where the original board supply may differ from the replacement device's rated range or where a legacy design operates close to its maximum clock frequency.
규정 준수 정보
The supplied search results include pages that may discuss RoHS and REACH, but they do not provide authoritative compliance declarations for the Texas Instruments CD4020BE. Compliance fields are therefore marked unknown rather than inferred.
