CD4585BE - 4-Bit CMOS Magnitude Comparator | TI
부품 번호: CD4585BE ✓ 활성CD4585BE 개요
A magnitude comparator is a logic IC within the broader CMOS comparator category. Its purpose is to evaluate the relative magnitude of two multi-bit values and produce a corresponding digital result. The CD4585B supports binary and BCD data, making it useful in computer-control, digital arithmetic, threshold-detection, sorting, and industrial automation systems. Its three cascading inputs allow designers to extend comparisons beyond four bits by connecting multiple devices.
The principal features include eight 4-bit comparison inputs, three active-high outputs labeled A<B, A=B, and A>B, and a wide 3 V to 18 V supply range. The wide operating voltage is useful when a system uses a supply above the typical 5 V logic range. The specified -55 °C to 125 °C temperature range provides broad environmental capability, while CMOS operation places the device in the low-power CD4000 logic family.
The CD4585B compares each corresponding bit of the two input words and propagates the most significant comparison result toward the lower-order bits. This internal structure produces three mutually related outputs rather than one combined result. Cascading inputs permit a higher-order device to accept the comparison state generated by a lower-order device, enabling comparison of wider binary or BCD values without redesigning the basic logic function.
Typical applications include digital counters, threshold and limit detectors, arithmetic control, industrial sequence control, sorting logic, and embedded decision systems. It can compare a measured or represented value against a reference word and indicate whether the value is below, equal to, or above the configured limit. The BCD capability also supports decimal display and control systems where encoded ten-state values are more convenient than binary values.
When designing around the CD4585BE, verify unused inputs so that no CMOS input remains floating. Place supply-bypass capacitance close to the device and route output signals away from noisy analog or switching nodes. Because the part is a through-hole PDIP device, it is particularly suitable for prototypes, educational systems, legacy industrial equipment, and new designs that specifically retain a 16-pin through-hole footprint.
This page combines manufacturer information, distributor availability, package details, related comparator references, and engineering-oriented comparison data. It also identifies where verified technical values are unavailable so procurement and design decisions can be made without confusing incomplete cross-reference information with a guaranteed drop-in replacement.
드롭인 대체품: CD4585BE — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: CD4585BE (동일 폼 팩터 및 풋프린트) — 차이점: Package.
HEF4585BP,652
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC14555BCP
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
CD4585BE 최대 정격 & 전기적 특성
| Product Type | 4-bit magnitude comparator |
| Logic Family | CMOS CD4000 series |
| Number of Compared Bits | 4 bits |
| Comparison Input Count | 8 inputs |
| Output Count | 3 outputs |
| Output Functions | A<B, A=B, and A>B |
| Output Polarity | Active high |
| Cascading Input Count | 3 inputs |
| Supply Voltage Range | 3 V to 18 V |
| Supported Data Formats | Binary and BCD |
| 동작 온도 범위 | -55 °C to 125 °C |
| 패키지 | 16-pin PDIP |
| 핀 수 | 16 pins |
| 실장 유형 | Through-hole |
| Manufacturer Qualification | Texas Instruments |
CD4585BE 16-pin pdip 핀 구성 가이드
CD4585BE(16-pin pdip 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: CD4585BE.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
CD4585BE 적합 용도: 6 애플리케이션s: Industrial Threshold Detection, Digital Counter Limit Control, BCD Arithmetic Control, Sorting and Ranking Logic, Legacy Equipment Retrofit, Educational Logic Prototyping.
Industrial Threshold Detection
The CD4585BE fits industrial threshold detection when a sensor or process variable has already been converted into a 4-bit binary or BCD word. Its eight comparison inputs accept the measured value and a limit reference, while the active-high A<B, A=B, and A>B outputs provide a direct decision without firmware polling. The verified 3 V to 18 V supply range allows operation from conventional logic rails through higher-voltage industrial control systems. Designers should use the -55 °C to 125 °C rating as a component-level operating specification, then account for enclosure temperatures, regulator tolerance, and input filtering before defining the actual alarm threshold.
추천
Digital Counter Limit Control
A counter or timer output can be compared against a preset limit with the CD4585BE when both signals are represented as 4-bit values. The comparator produces less-than, equal-to, and greater-than outputs that can inhibit a counter, trigger an alarm, or initiate another control sequence. Its three cascading inputs are useful when the system must compare more than four bits. For reliable industrial operation, the inputs must remain valid CMOS logic levels, unused inputs should be tied to defined states, and the supply should be decoupled close to the 16-pin PDIP device.
추천
BCD Arithmetic Control
The CD4585BE is useful in decimal arithmetic and sequencing systems because it accepts two 4-bit BCD words and reports their relative magnitude. A decimal counter can compare its current count with a programmed decade boundary, producing signals for carry control, display sequencing, or event triggering. This avoids interpreting the BCD digits through a separate processor. The implementation must ensure that only valid BCD states are presented and that propagation timing fits the counter rollover window. The wide verified supply range of 3 V to 18 V also allows the comparator to share compatible control rails in legacy equipment.
추천
Sorting and Ranking Logic
The CD4585BE can implement a basic sorting or ranking decision by comparing two 4-bit items and exposing their relative order through A<B, A=B, and A>B. In a small control system, these outputs can drive a swap decision, selection latch, or priority path. Binary data permits ordinary numeric ordering, while BCD supports decimal ranking. Cascading can extend the compared width when multiple devices are available. Designers must budget propagation delay against the system clock and ensure that simultaneous comparator outputs are interpreted only after the relevant decision has settled, avoiding false transitions near equality.
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Legacy Equipment Retrofit
The CD4585BE is well matched to legacy equipment because it provides a 16-pin PDIP through-hole package, broad supply-voltage support, and a CMOS logic function commonly associated with older industrial and instrument systems. It can replace an existing comparator position when the footprint, pinout, supply, and output timing match. Retrofitting should begin with a board-level audit of every connected net because the supplied snippets do not provide a complete verified pin table. If the PCB cannot be changed, the original schematic and manufacturer datasheets should confirm orientation, cascade connections, and signal levels before installation.
추천
Educational Logic Prototyping
The CD4585BE supports classroom and laboratory experiments in digital comparison because it visibly evaluates two complete 4-bit words and provides three distinct result outputs. Students can demonstrate binary versus BCD interpretation, magnitude relationships, and multi-device cascading without a microcontroller. The 16-pin PDIP package is straightforward to mount on a solderless breadboard or through-hole trainer board. Because CMOS inputs must not float, unused inputs and cascade terminals should be connected deliberately. A regulated supply and local bypass capacitor are recommended so that switching noise or an unstable breadboard rail does not obscure the demonstrated comparison result.
추천
추천 제품 요약
엔지니어링 참조 데이터: CD4585BE — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | HEF4585BP,652 | MC14555BCP |
|---|---|---|---|
| Brand | Texas Instruments | NXP Semiconductors | onsemi |
| Package | 16-pin PDIP | PDIP-16 | PDIP-16 |
| Function | 4-bit magnitude comparator | 4-bit magnitude comparator | 4-bit magnitude comparator |
주요 차별점
- Broad supply-voltage operating range (vs MC14555BCP)
- Confirmed BCD and binary comparison support (vs HEF4585BP,652)
- Documented broad temperature capability (vs MC14555BCP)
- Explicit three-result magnitude output (vs HEF4585BP,652)
설계 노트
Do not allow CMOS inputs to float. The CD4585BE has comparison, and potentially cascading, inputs that must always be driven to a valid logic level. Before energizing a prototype, inspect the schematic for unused inputs and connect each according to the manufacturer datasheet. A floating input can oscillate, produce indeterminate comparison results, and increase supply current. Because the supplied web excerpts do not provide every numbered pin assignment, use the official CD4585B pin diagram rather than inferring connections from neighboring functions.
Place the supply-bypass capacitor close to the device’s VDD and VSS pins, with a short and low-inductance return path. Although this is a legacy CMOS logic device rather than a high-speed component, supply transients can propagate through comparison and cascade inputs. Keep the comparator away from switching-node currents and relay-coil wiring where practical. If replacing an existing design, preserve the original footprint and pin-1 orientation only after checking the manufacturer package drawing and the board legend.
Account for propagation delay when using the A<B, A=B, or A>B outputs to drive counters, flip-flops, or asynchronous control signals. The verified results do not provide a numerical delay for the CD4585BE, so obtain that value from the manufacturer datasheet and add margin for temperature and supply variation. Cascaded devices must use the lower-order section’s comparison result to control the higher-order section correctly; otherwise, the final magnitude decision can be transiently incorrect.
Operate the device only within the verified 3 V to 18 V supply range and use a regulator with adequate stability for CMOS logic loads. The CD4000 family’s low static current does not imply that system-level power is zero because input switching and output transitions also contribute to supply current. Check the absolute maximum ratings and input/output limits from the manufacturer datasheet, especially when interfacing the comparator with 5 V TTL, relay drivers, or external logic powered from a different rail.
규정 준수 정보
The supplied verified results identify the manufacturer, function, package, supply range, and temperature range but do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred.