CD4585BE - 4-Bit CMOS Magnitude Comparator | TI
N.º da peça: CD4585BE ✓ AtivoCD4585BE Visão geral
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.
Alternativas drop-in para CD4585BE — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com CD4585BE (mesmo formato e footprint) — diferindo em Package.
HEF4585BP,652
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC14555BCP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CD4585BE Classificações máximas e características elétricas
| 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 |
| Faixa de temperatura de operação | -55 °C to 125 °C |
| Encapsulamento | 16-pin PDIP |
| Contagem de pinos | 16 pins |
| Tipo de montagem | Through-hole |
| Manufacturer Qualification | Texas Instruments |
Guia de Configuração de Pinos do CD4585BE 16-pin pdip
Configuração de pinos para CD4585BE (pacote 16-pin pdip). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para CD4585BE.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
CD4585BE é adequado para 6 aplicaçãos: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para CD4585BE — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | 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 |
Principais diferenciais
- 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)
Notas de projeto
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.
Informações de conformidade
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.