CD4063BM - 4-Bit CMOS Magnitude Comparator | TI
N.º da peça: CD4063BM ✓ AtivoCD4063BM Visão geral
A magnitude comparator is a digital logic circuit that determines whether one numeric word is less than, equal to, or greater than another. The CD4063BM belongs to the CMOS logic family and occupies the hierarchy of comparator, digital comparator, logic IC, and integrated circuit. Its binary and BCD support makes it useful in computer, control, arithmetic, and digital decision-making systems where a compact hardware comparator can simplify control logic.
The principal features include eight comparison inputs designated A3 through A0 and B3 through B0, plus active-high A<B, A=B, and A>B outputs. Cascading inputs allow multiple comparator sections to be combined when comparing numbers wider than four bits. The manufacturer identifies the CD4063B family as pin-compatible with the standard 7485 TTL type, while the CD4063BM is the 16-SOIC ordering variant.
Internally, the device compares the two 4-bit words by evaluating their binary significance and generating mutually exclusive magnitude decisions. This hardware approach provides a direct result without a clock or iterative software loop. For cascading applications, the additional inputs allow a lower-order comparison section to inform a higher-order section, supporting larger multibit comparisons from identical functional blocks.
Typical uses include digital control systems, industrial counter and sequencing logic, computer address and data-path comparisons, BCD processing, and embedded decision logic. The three explicit result outputs also allow a controller to branch immediately according to whether the two operands are less than, equal to, or greater than one another.
Designers should account for propagation delay, supply-voltage requirements, unused inputs, and output loading when integrating the comparator into longer digital chains. Cascaded sections should follow the manufacturer's input connection and timing guidance. The supplied verified data does not include the complete electrical timing table, so voltage, current, delay, and temperature limits must be confirmed in the manufacturer datasheet before release.
This page combines the verified manufacturer description, distributor inventory and price observations, same-package replacement options, and practical design guidance. It separates confirmed CD4063BM facts from parameters that still require datasheet verification, providing engineers with a concise selection and implementation reference.
Alternativas drop-in para CD4063BM — 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 CD4063BM (mesmo formato e footprint) — diferindo em Package.
CD4063BE
✅ Drop-InConsulte o preço
Ver ficha técnica →CD4063BF
✅ Drop-In ⚠️ Especificações não verificadasConsulte o preço
Ver ficha técnica →HCF4063BM1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
HCF4063BM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CD4063BM Classificações máximas e características elétricas
| Comparator Type | 4-bit magnitude comparator |
| Logic Family | CMOS |
| Supported Number Formats | Binary or BCD |
| Comparison Input Count | 8 inputs |
| Comparison Input Designations | A3-A0 and B3-B0 |
| Output Count | 3 outputs |
| Output Designations | A<B, A=B, and A>B |
| Output Polarity | Active-high |
| Cascading Input Count | 3 cascading inputs |
| Encapsulamento | 16-SOIC |
| Package Width | 0.154 in (3.90 mm) |
| Tipo de montagem | Surface mount |
| TTL Compatibility | Pin-compatible with standard 7485 TTL type |
| Status RoHS | unknown |
| REACH Status | unknown |
Guia de Configuração de Pinos do CD4063BM 0.154 in (3.90 mm)
Configuração de pinos para CD4063BM (pacote 0.154 in (3.90 mm)). 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 CD4063BM.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
CD4063BM é adequado para 6 aplicaçãos: Digital Address and Data-Path Comparison, BCD Counter and Sequencing Control, Cascaded Wide-Word Comparisons, Industrial Control and Threshold Decisions, Communication and Control Packet Validation, Embedded Decision and Safety-Interlock Logic.
Digital Address and Data-Path Comparison
The CD4063BM is appropriate for hardware comparison of two 4-bit addresses or data values because it produces separate active-high outputs for less-than, equal-to, and greater-than conditions. It can be placed between a processor bus and control logic so that a direction or selection decision is available without executing a software comparison. The 16-pin SOIC package supports compact digital layouts, while the eight A and B inputs map naturally to nibble-wide buses. During design, verify propagation delay against the bus timing and confirm that the selected alternative has the same numbered pins before substituting a HCF or CD4063BE device.
Recomendado
BCD Counter and Sequencing Control
The CD4063BM can compare BCD nibbles in decimal counters, display-processing logic, and sequencing controllers. Its ability to handle either binary or BCD makes it useful when two 4-bit decimal values must be tested before a counter increments, reloads, or transitions to another state. The A<B, A=B, and A>B outputs allow each branch of a state machine to use a dedicated decision path. In a practical implementation, account for cumulative logic delay when several gates follow the comparator and use the manufacturer timing data to establish a safe clock or settling margin.
Recomendado
Cascaded Wide-Word Comparisons
The CD4063BM is useful when a system must compare more than four bits by connecting multiple comparator sections through the three cascading inputs. Each section can evaluate a 4-bit slice and pass a lower-order relationship into the next section, allowing an 8-bit, 12-bit, or wider comparison to be assembled from repeatable blocks. This approach avoids implementing a complete word comparator in programmable logic. The key design constraint is timing: total propagation delay accumulates through the cascaded path, so the system clock and settling time must be verified against the worst-case conditions stated in the CD4063B datasheet.
Recomendado
Industrial Control and Threshold Decisions
The CD4063BM can implement threshold decisions in industrial control boards by comparing a 4-bit command, setpoint, or status word against a reference value. Its three separate outputs make it possible to trigger different actions for below-target, on-target, and above-target conditions. This avoids multiple equality gates and provides direct logic usable by relays, display drivers, or downstream programmable interfaces. For an industrial environment, engineers should verify the device's supported supply range, temperature grade, noise immunity, and timing from the manufacturer datasheet rather than inferring them from the generic CMOS description.
Recomendado
Communication and Control Packet Validation
The CD4063BM can support simple length, ordering, or checksum-stage validation in communication equipment by comparing two 4-bit control fields. The less-than, equal-to, and greater-than outputs can select protocol actions without requiring a general-purpose controller to execute a sequence for every comparison. It is particularly suitable for low-speed legacy CMOS control logic and status multiplexing. The design must ensure that input levels remain within the device's supported supply and threshold ranges, that outputs do not exceed their load capability, and that any isolation or level translation is correctly inserted between modern bus devices and the CD4063BM.
Recomendado
Embedded Decision and Safety-Interlock Logic
The CD4063BM can act as a hardware interlock for systems in which two 4-bit status fields must satisfy a defined relationship before another operation is permitted. For example, an A=B output can qualify a machine enable, while A<B and A>B identify invalid operating ranges for diagnostic routing. Hardwired comparison reduces dependence on firmware for a specific decision, although it does not replace a complete functional-safety assessment. Designers should evaluate single-fault behavior, reset and power-up states, unused-input handling, timing margins, and the exact replacement part's electrical characteristics before using the comparator in a safety-related path.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para CD4063BM — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | CD4063BE | CD4063BF | HCF4063BM1 | HCF4063BM |
|---|---|---|---|---|---|
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Comparison Width | 4 bits | 4 bits | 4 bits | 4 bits | 4 bits |
| Magnitude Outputs | 3 active-high outputs: A<B, A=B, A>B | 3 magnitude outputs | 3 magnitude outputs | 3 magnitude outputs | 3 magnitude outputs |
| Logic Technology | CMOS | CMOS | CMOS | CMOS | CMOS |
Principais diferenciais
- Direct three-way comparison without software (vs CD4063BE)
- Native cascading support (vs HCF4063BM1)
- Documented TTL-family footprint relationship (vs HCF4063BM)
Notas de projeto
Do not treat every same-package 4-bit comparator as an automatic substitute. The verified excerpts establish the CD4063BM function and 16-SOIC package, but they do not provide the complete pin-number mapping, propagation delay, supply range, or temperature grade for every alternative. Before replacing CD4063BM with CD4063BE, CD4063BF, HCF4063BM1, or HCF4063BM, compare the manufacturer connection diagrams and electrical tables and confirm that every unused or cascading terminal is connected identically.
Include the CD4063BM propagation delay in the system timing budget rather than treating the result as instantaneous. Cascaded comparisons can accumulate delay across multiple sections, so a 4-bit slice chain may require several comparison intervals before its outputs are stable. Confirm the maximum delay at the intended supply voltage and temperature, and avoid using the comparison result to trigger a narrow pulse unless the downstream timing has been verified against those worst-case values.
Place the comparator near the A and B input drivers to minimize unequal propagation caused by trace-length mismatch. Keep the eight input routes away from high-current switching nodes and maintain a continuous return path beneath the device. Since a magnitude comparator examines several bits simultaneously, inconsistent rise and fall times can create unequal arrival times at the inputs even when the PCB traces are geometrically matched. Validate the interface with an oscilloscope when switching noise or long interconnects are present.
Operate the CD4063BM only within the supply-voltage range, input thresholds, output-current limits, and absolute maximum ratings stated in the current manufacturer datasheet. Those values were not present in the supplied excerpts and must not be inferred from the CD4000-series name. Decouple the supply locally, provide a stable ground reference, and account for CMOS input behavior and unused-pin requirements before releasing the PCB layout.
Informações de conformidade
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because the CD4063BM is a general-purpose logic IC and no automotive qualification claim was provided.
