CD4063BF - 4-Bit CMOS Magnitude Comparator | Texas Instruments
Артикул: CD4063BF ✓ АктивенCD4063BF Обзор
A magnitude comparator is a combinational logic circuit used to determine the relative ordering of two multibit numbers. Within the logic hierarchy, the CD4063BF belongs to the comparator and arithmetic-comparison category, the broader CMOS logic family, and ultimately the digital integrated-circuit and semiconductor categories. Unlike a dedicated arithmetic logic unit, a comparator provides only the relational result between two operands, making it useful for control sequencing, sorting stages, threshold decisions, and binary-to-BCD comparison systems.
The CD4063BF accepts two groups of four comparison inputs labeled A3 through A0 and B3 through B0. Its primary outputs indicate A less than B, A equal to B, and A greater than B. Additional cascade inputs permit the comparison function to be expanded beyond four bits. The chip is also described as pin-compatible with the standard 7485 TTL magnitude comparator, which supports legacy board-level replacement planning when supply conditions or operating requirements need review.
Technically, the CD4063BF belongs to the CD4000 CMOS logic family and is intended for computer and logic systems that compare binary or BCD words. The comparison is implemented as combinational logic, so output states follow the applied input states without a clock. Cascade control determines how the device participates in a wider comparison, allowing engineers to construct larger word-length comparators while preserving the same output convention.
Typical uses include industrial sequencing and sorting control, binary or BCD decision logic, interface adaptation between older TTL and CMOS systems, and embedded logic where three relational states must be generated from two 4-bit operands. The -55°C to +125°C operating range also makes the device relevant to temperature-extended industrial equipment, although system-level supply, noise, and timing constraints must still be checked against the manufacturer datasheet.
When designing around the CD4063BF, verify every voltage and timing value against the applicable manufacturer data before release. In particular, confirm the supply range, input and output propagation delays, output-drive capability, and unused-input states for the exact package and grade. Because the CD4063BF is a through-hole CDIP device, also allow for lead spacing, insertion clearance, and possible obsolete-part procurement risk.
This product record combines the verified TI product description, package and temperature information, distributor availability evidence, and explicitly identified same-family alternatives. It also adds practical comparison guidance and design notes that distinguish a documented drop-in candidate from merely similar CMOS logic devices.
Аналоги без доработки для CD4063BF — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
CD4063BF3A
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CD4063BF
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Открыть даташит →CD4063BF Максимальные параметры и электрические характеристики
| Функция | 4-bit magnitude comparator |
| Logic Family | CD4000 CMOS |
| Comparison Input Width | 4 bits |
| Number of Comparison Inputs | 8 inputs |
| Comparison Input Labels | A3-A0 and B3-B0 |
| Primary Outputs | 3 outputs: A < B, A = B, and A > B |
| Cascading Inputs | 3 inputs |
| Supported Number Formats | Binary or BCD |
| Диапазон рабочих температур | -55°C to +125°C |
| Корпус | 16-CDIP ceramic dual-in-line package |
| Package Pin Count | 16 pins |
| Тип монтажа | Through-hole insertion |
| TTL Compatibility | Pin-compatible with the standard 7485 TTL type |
Конфигурация выводов CD4063BF
| Контакт 1 | A3 — Comparison input A3 |
| Контакт 2 | A2 — Comparison input A2 |
| Контакт 3 | A1 — Comparison input A1 |
| Контакт 4 | A0 — Comparison input A0 |
| Контакт 5 | B3 — Comparison input B3 |
| Контакт 6 | B2 — Comparison input B2 |
| Контакт 7 | B1 — Comparison input B1 |
| Контакт 8 | B0 — Comparison input B0 |
| Контакт 9 | A<B — Output indicating A is less than B |
| Контакт 10 | A=B — Output indicating A is equal to B |
| Контакт 11 | A>B — Output indicating A is greater than B |
| Контакт 12 | A>B CASCADE — Greater-than cascade input |
| Контакт 13 | A=B CASCADE — Equal-to cascade input |
| Контакт 14 | A<B CASCADE — Less-than cascade input |
| Контакт 15 | VDD — Positive supply terminal |
| Контакт 16 | VSS — Ground or negative supply reference |
Типичное применение
CD4063BF подходит для 6 применениеs: Industrial sequencing control, Binary sorting and threshold detection, BCD display and instrument control, Legacy TTL interface adaptation, Data acquisition range comparison, Retrofit and obsolescence mitigation.
Industrial sequencing control
The CD4063BF is appropriate for industrial sequencing systems that must decide whether an incoming 4-bit machine state is below, equal to, or above a stored reference. Its eight A and B comparison inputs allow a controller to evaluate binary or BCD words, while the three outputs can drive state-transition logic without requiring a dedicated processor. The documented -55°C to +125°C operating range supports temperature-extended equipment designs. Implementation should preserve the comparator's power-up behavior and verify supply limits, noise margins, and propagation delay against the manufacturer data before connecting relay, PLC, or actuator interfaces.
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Binary sorting and threshold detection
A CD4063BF can serve as the decision element in a small binary sorting or threshold-detection stage. Two 4-bit values are applied to the A and B inputs, and the less-than, equal-to, or greater-than output identifies their relationship. This is useful when a simple comparator must control a discrete logic path rather than a complete processor. For a multi-stage sorter, the cascade inputs allow additional comparator sections to contribute to wider-word decisions. Timing margins, fan-out, and the number of stages must be reviewed because each added comparison path introduces propagation delay.
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BCD display and instrument control
The CD4063BF can compare BCD-coded quantities in instruments and decimal-oriented control equipment, matching the verified Texas Instruments description that supports binary or BCD words. A decoded BCD value from a counter or measurement block can be applied alongside a programmed reference, after which the three relational outputs indicate whether the measured quantity is below, equal to, or above the set point. This arrangement is useful for threshold alarms and panel-control logic. Engineers should verify the available input codes and account for unused states when decoding arbitrary bus values.
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Legacy TTL interface adaptation
The CD4063BF is relevant to equipment that retains older 7485-style magnitude-comparison blocks but also includes CMOS control logic. The Texas Instruments product information identifies the device as pin-compatible with the standard 7485 TTL type, which can simplify investigation of a board-level replacement. Pin compatibility does not eliminate interface checks: supply voltage, input thresholds, output drive, noise margin, and propagation timing must be compared at the actual bus conditions. The replacement should therefore be validated with worst-case loading and noise before production use.
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Data acquisition range comparison
The CD4063BF can be used in a data-acquisition front end where a digitized measurement is compared with a threshold represented by another 4-bit word. The equality output can flag an exact target code, while the greater-than and less-than outputs identify adjustment direction for a downstream controller. This application is especially practical for coarse quantization stages, instrument set points, and simple alarm logic. The system's usable resolution depends on the comparator's propagation delay and the stability of the reference word, so sampling architecture and settling time should be analyzed together.
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Retrofit and obsolescence mitigation
CD4063BF can support targeted retrofit work in older 16-CDIP industrial or laboratory equipment where a four-bit magnitude-comparison function is already present. The TI product page identifies multiple package options in the CD4063B family, while the verified distributor results show CD4063BF-specific inventory and sourcing activity. Engineers should identify the original schematic and pin configuration, confirm that the replacement retains every required output and cascade connection, and reproduce the original part's environmental and qualification constraints. This approach is intended for controlled maintenance and lifecycle management rather than unqualified new-design substitution.
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Сводка рекомендуемых товаров
Справочные инженерные данные для CD4063BF — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | CD4063BF3A | CD4063BF |
|---|---|---|---|
| Package | 16-CDIP | 16-CDIP | 16-CDIP |
| Brand | Texas Instruments | Texas Instruments | Harris Corporation |
| Function | 4-bit magnitude comparator | 4-bit magnitude comparator | 4-bit magnitude comparator |
| Comparison Inputs | 8 | 8 | 8 |
| Primary Outputs | 3 | 3 | 3 |
| Cascading Inputs | 3 | 3 | 3 |
Ключевые отличия
- Documented legacy comparator interface (против CD4063BF3A)
- Wide operating-temperature specification (против CD4063BF3A)
- Native binary and BCD comparison (против CD4063BF)
Заметки по проектированию
Treat pin compatibility with the 7485 TTL comparator as a mechanical starting point, not proof of electrical interchangeability. Verify the CD4063BF supply voltage, input thresholds, output drive, noise margin, and propagation delay against the exact datasheet. The verified web data confirms the compatibility statement and the -55°C to +125°C temperature range, but it does not provide the complete timing table required for a released design.
Do not select a CD4063BF replacement based only on the 16-CDIP footprint. Confirm its operating and absolute-maximum supply ratings, quiescent current, and input/output voltage limits from the applicable manufacturer data. If a legacy board mixes TTL and CMOS signals, check every connected input and output against both devices' thresholds and noise margins; a physically insertable part can still fail interface timing or logic-level requirements.
Route the A and B comparison inputs away from fast-switching clock or power-converter nodes, especially when the comparator feeds a control input with narrow setup margin. For a cascaded design, keep the cascade interconnect short and account for the propagation delay of every comparator section. The CD4063BF's through-hole CDIP package offers generous routing options, but signal integrity still depends on return paths and bypassing near the supply pins.
Before releasing a retrofit, compare the approved device's truth table, cascade behavior, power-up states, and unused-input recommendations with the original component. The CD4063BF supports binary or BCD comparisons, so an invalid BCD input can produce a relational result that does not match the intended decimal value. Add explicit input validation where the upstream source can enter an illegal code, and test all equality and greater-than transitions rather than only one nominal state.
Информация о соответствии
The verified data does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because this is a legacy logic IC rather than an automotive-qualified product in the supplied evidence.
