CD4063BD - 4-Bit CMOS Magnitude Comparator | Harris
MPN: CD4063BD ✓ ActiveCD4063BD Overview
A magnitude comparator is a combinational logic device within the broader digital comparator family. Its role in a digital system hierarchy is to examine parallel numerical words and generate control or status signals describing their relative order. The CD4063B belongs to the CD4000 CMOS logic family, whose members use complementary MOS logic and are designed for low-power digital systems operating from a common supply rail.
The CD4063BD provides eight comparison inputs designated A3 through A0 and B3 through B0. Its three active-high outputs indicate A less than B, A equal to B, and A greater than B. Three cascading inputs allow multiple comparator sections to be combined, making the circuit useful when comparing widths greater than four bits. The ceramic DIP construction also distinguishes the BD grade from commercial plastic-package variants.
Operationally, the comparator evaluates all four corresponding bit pairs and produces mutually related ordering outputs. In a cascaded design, the upper section compares the most significant four-bit word and passes the result to the lower section, where it is combined with the lower word comparison. This arrangement supports exact selection, sorting, address decoding, and numerical threshold functions without requiring a general-purpose processor to perform every comparison.
Typical applications include digital counters, arithmetic control, industrial control systems, test equipment, address comparators, and embedded control logic. In an address-selection circuit, the comparator can assert an equality output when an input address matches a programmed reference word. In a cascaded magnitude-comparison system, multiple CD4063BD devices can compare wider operands while retaining the three standard ordering outputs at each section.
Designers should account for CMOS input and output behavior, supply bypass capacitors, unused inputs, and propagation delay when cascading several stages. Inputs must not float, and every unused input should be tied to a defined logic level. Because the verified source data does not provide the complete electrical limits, pin numbering, or timing tables, those values require confirmation from the applicable manufacturer datasheet before release to production.
Drop-in alternatives for CD4063BD — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
CD4063BD
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View Datasheet →CD4063BD
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View Datasheet →CD4063BD
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View Datasheet →CD4063BD
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View Datasheet →CD4063BD Maximum Ratings & Electrical Characteristics
| Product Type | 4-bit magnitude comparator |
| Logic Family | 4000/14000/40000 series CMOS |
| Comparison Inputs | 8 inputs: A3 through A0 and B3 through B0 |
| Comparison Outputs | 3 outputs: A<B, A=B, and A>B |
| Cascading Inputs | 3 inputs |
| Word Width | 4 bits |
| Supported Data Formats | Binary or BCD |
| Output Polarity | Active high |
| Package | 16-pin CDIP |
| Mounting Type | Through-hole dual in-line |
| Pin Count | 16 pins |
CD4063BD 16-pin cdip Pin Configuration Guide
Pin configuration for CD4063BD (16-pin cdip package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for CD4063BD.
Refer to the datasheet for full pin configuration.
Typical Applications
CD4063BD is suitable for 6 applications: Digital Address Comparison, Cascaded Wide-Word Comparator, Digital Counter Threshold Control, Arithmetic Control and Conditional Logic, Test and Measurement Equipment, Data Sorting and Selection Control.
Digital Address Comparison
The CD4063BD is suitable for comparing a 4-bit address or selection word against a reference word and generating separate less-than, equal-to, and greater-than indications. Its eight comparison inputs accept two complete 4-bit operands, while the active-high outputs can drive chip-select, routing, or interlock logic. This direct hardware comparison reduces the need for a microcontroller to execute every address test. Because the verified excerpts do not publish propagation-delay limits, the implementation must confirm timing from the manufacturer datasheet and account for cascading delay if multiple sections are used.
Recommended
Cascaded Wide-Word Comparator
Multiple CD4063BD devices can be cascaded to compare operands wider than the native 4 bits. Each stage evaluates a separate four-bit slice and uses its three cascading inputs to pass the upper-section result into the next stage. This arrangement is useful in digital counters, sorting networks, and arithmetic-control blocks where an exact greater-than or equal-to decision is required. The verified TI product page confirms the three cascading inputs, but maximum system frequency, setup requirements, and cumulative propagation delay must be established from the applicable manufacturer datasheet before high-speed implementation.
Recommended
Digital Counter Threshold Control
In a counter or event-counter system, the CD4063BD can compare a four-bit count value with a threshold and produce an active-high equality output for control and alarm logic. The A<B and A>B outputs can additionally distinguish whether the count is below or above the selected threshold without software polling. This makes the comparator useful in industrial sequencing, test systems, and repetitive machinery. Designers should ensure that the input count is stable around the decision boundary and verify propagation delay and output timing from the manufacturer datasheet.
Recommended
Arithmetic Control and Conditional Logic
The CD4063BD provides hardware ordering information for two 4-bit operands, allowing arithmetic-control logic to respond directly to equal, greater-than, or less-than conditions. The three active-high outputs can enable gates, registers, or data paths when a numerical relationship is satisfied. This is particularly useful in legacy CMOS systems, educational instruments, and small industrial controllers that perform conditional operations without a programmable processor. Supply-voltage, fan-out, and timing details are not present in the verified snippets, so conservative datasheet-based validation remains necessary.
Recommended
Test and Measurement Equipment
The CD4063BD can serve as the ordering element in bench instruments that compare a measured control word against a programmed reference. Active-high A=B, A>B, and A<B outputs make it straightforward to generate pass, fail, over-range, and under-range indications. The CD4000-series CMOS architecture is appropriate for systems operating from a shared digital supply, while the ceramic DIP package supports through-hole construction. The available verified sources do not state input capacitance, noise margin, or timing values, so measurement-instrument designs should verify those characteristics directly from the manufacturer documentation.
Recommended
Data Sorting and Selection Control
A cascaded bank of CD4063BD comparators can establish the relative order of multiple numeric fields and then enable the appropriate data path through its ordering outputs. This pattern is useful in programmable sorting, priority selection, and conditional data-routing equipment. The dedicated A<B, A=B, and A>B results make control behavior explicit and easier to troubleshoot than an encoded comparator response. System timing must account for every cascaded section, and all CMOS inputs must remain at defined levels to prevent unpredictable operation in noisy environments.
Recommended
Recommended Products Summary
Engineering reference data for CD4063BD — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CD4063BD | CD4063BD | CD4063BD | CD4063BD |
|---|---|---|---|---|---|
| Package | 16-pin CDIP | 16-pin CDIP | 16-pin CDIP | 16-CERDIP | 16-pin CDIP |
| Brand | Harris Corporation | Texas Instruments | Narda-MITEQ | Rochester Electronics | RCA |
| Comparator Width | 4 bits | 4 bits | 4 bits | 4 bits | 4 bits |
| Logic Family | 4000/14000/40000 series CMOS | CD4000 series CMOS | CD4000 series CMOS | CD4000 series CMOS | CD4000 series CMOS |
| Comparison Inputs | 8 inputs | 8 inputs | 8 inputs | 8 inputs | 8 inputs |
| Comparison Outputs | 3 active-high outputs | 3 active-high outputs | 3 active-high outputs | 3 active-high outputs | 3 active-high outputs |
| Cascading Inputs | 3 inputs | 3 inputs | 3 inputs | 3 inputs | 3 inputs |
| Supported Data Formats | Binary or BCD | Binary or BCD | Binary or BCD | Binary or BCD | Binary or BCD |
Key Differentiators
- Provides three explicit ordering outputs rather than a single encoded result (vs CD4585BE)
- Supports extension beyond four-bit operands (vs CD4063BE)
- Uses the specified ceramic DIP ordering grade (vs CD4063BE)
Design Notes
Do not allow any CMOS input to float. The CD4063BD has eight word-comparison inputs and three cascading inputs, so every unused input must be tied to a defined logic level. Although the verified excerpts do not provide the complete pin table, the input architecture and output polarity should be reconfirmed from the manufacturer datasheet before layout release. Incorrectly tying an unused cascading input can cause an incorrect equality result even when the four-bit operands are valid.
Place the supply-bypass capacitor close to the device and follow the capacitance and connection recommendations in the applicable manufacturer datasheet. The supplied data confirms a CMOS comparator but does not state the supported supply range, quiescent current, or output-drive capability. Those electrical limits must be established before selecting bypass capacitance or deriving expected supply current. This is especially important when the CD4063BD is used in legacy 5 V or 10 V CMOS systems.
A same-MPN manufacturer change is not automatically a qualification. For every proposed CD4063BD source, compare the pinout, supply voltage, propagation delay, output levels, temperature range, ceramic package dimensions, and any radiation or quality screening. The verified search excerpts establish the 4-bit CMOS function and 16-pin package for the available sources, but they do not provide complete electrical tables. Preserve the original manufacturer drawing or obtain an approved cross-qualification report before production substitution.
When cascading multiple CD4063BD sections, treat the cascade as a timing chain. Include the cumulative propagation delay of every stage when defining setup and hold requirements, and keep the comparison inputs stable around decision boundaries. The verified TI product page confirms three cascading inputs but does not publish delay figures, so maximum operating frequency cannot be responsibly calculated from the supplied information. Validate the complete cascade in hardware using the applicable datasheet timing limits.
Compliance Information
The verified search excerpts do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance must be confirmed using the current declaration associated with the selected manufacturer and orderable MPN.
