CD4018AK - Presettable Divide-by-N Counter | Harris Corporation
Teilenummer: CD4018AK ✓ AktivCD4018AK Übersicht
A CMOS counter is a digital logic circuit that counts clock pulses and represents the count through binary output states. The CD4018 family belongs to the CD4000 CMOS logic family and provides programmable counting behavior, including decade-counter use when the appropriate feedback and control connections are applied. This places it within the broader hierarchy of counter logic -> digital logic IC -> CMOS logic -> semiconductor.
The principal feature of the CD4018AK is its presettable counter architecture, which allows an initial count to be established and then incremented by incoming clock events. Its 16-terminal package provides access to the clock, reset, load, decade-count, and counter-output functions. The reported maximum operating temperature of 125°C and minimum operating temperature of -55°C support use across industrial and military-temperature environments where wider operating ranges are required.
The CD4018AK operates from a low-voltage CMOS supply and uses the CD4000-series logic family conventions. Because it is a counter rather than a general-purpose microcontroller, it can implement frequency division, event counting, timing intervals, and sequential state generation with relatively few external components. The device is most useful when a fixed or limited counting sequence is required and programmable firmware would add unnecessary complexity.
Typical applications include decade counters, frequency dividers, digital timing systems, industrial sequence control, pulse-counting modules, and test equipment. In a frequency-divider implementation, the clock signal is routed through the counter stages while appropriate output taps provide divided frequencies. In a programmable timer, the preset and reset inputs establish the starting count and trigger a known sequence of output transitions.
PCB design must follow the manufacturer’s pin-description table and application examples because clock, reset, and preset functions can be sensitive to unwanted transitions. Keep clock traces short, decouple the supply close to the device, and avoid routing high-current or high-voltage switching signals near the counter inputs. The 16-pin flat package should be inspected for pin orientation and exposed-terminal details before assembly.
This page combines the exact CD4018AK catalog attributes with drop-in alternatives, application guidance, package information, and design checks intended to reduce selection and integration risk. Use the manufacturer datasheet for final timing, electrical-limit, and pin-function decisions before production release.
Drop-in-Alternativen für CD4018AK – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
CD4018AE
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
CD4018AH
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
CD4018AJ
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
CD4018AK Grenzwerte & elektrische Eigenschaften
| Product Type | CMOS Presettable Divide-by-N Counter |
| Logic Family | CD4000 CMOS |
| Counter Element Count | 1 element |
| Circuit Count | 1 circuit |
| Terminal Count | 16 terminals |
| Package Code | DFP |
| Package Shape | Rectangular |
| Terminal Form | Flat |
| Temperature Grade | Military |
| Minimum Operating Temperature | -55°C |
| Maximum Operating Temperature | 125°C |
CD4018AK rectangular Pinbelegungsleitfaden
Pinbelegung für CD4018AK (rectangular-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für CD4018AK.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
CD4018AK ist geeignet für 6 Anwendungs: Decade Counter, Frequency Divider, Industrial Sequence Control, Pulse Counting Module, Digital Timer, Test and Measurement Equipment.
Decade Counter
The CD4018AK is appropriate for a decade-counting circuit because it is a presettable divide-by-N counter with a documented single counter element and 16-terminal flat package. The counter can be configured through its feedback and control inputs so that a decimal sequence is produced rather than a straight binary count. Its confirmed -55°C to 125°C operating range also makes the device suitable for decade-counter modules operating across industrial or military-temperature environments. Before layout, use the exact CD4018A pin table to connect the clock, reset, preset, feedback, and decoded outputs. Check that the selected supply voltage meets the counter’s electrical limits and that output transitions meet the load’s rise-time requirements. This approach is preferable to a microcontroller when the required counting sequence is fixed and deterministic timing is sufficient.
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Frequency Divider
The CD4018AK can divide an incoming clock into lower-rate signals for timing, sequencing, and control systems. Its presettable divide-by-N counter architecture allows a defined initial count and continued counting after each clock edge, while the 16-terminal flat package provides access to the required counter stages and control functions. The documented military temperature range of -55°C to 125°C supports use where ordinary commercial logic may be insufficient. For a practical divider, identify the output stage and feedback path from the manufacturer application diagram, then verify propagation delay and maximum clock frequency before calculating the maximum input frequency. Add test access or a header when commissioning so that clock integrity, reset behavior, and divide ratios can be checked without redesigning the PCB.
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Industrial Sequence Control
The CD4018AK is useful in industrial sequence-control logic when a fixed number of clock events must correspond to a machine state or actuator transition. The device provides a presettable counter element, allowing the sequence origin to be established and then advanced deterministically. Its confirmed operating range of -55°C to 125°C is advantageous in factory equipment exposed to wide ambient conditions. Implement reset as a controlled function rather than allowing a floating preset or clock input, and synchronize any external start command to avoid unintended counts. Validate every output state against the required machine sequence, including the safe state after power restoration. Because a discrete counter cannot provide the flexibility of firmware, it is best suited to stable, repetitive sequences where logic simplicity, deterministic response, and temperature range justify dedicated hardware.
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Pulse Counting Module
The CD4018AK can count pulses from a sensor, switch, or external event source and make the accumulated count available through its counter outputs. This is useful for batch counting, event totals, and repetitive actuator cycles where no user interface or complex arithmetic is required. The part’s military temperature grade and -55°C to 125°C operating range support use in demanding instrumentation and control environments. Condition noisy or slow-switching inputs before they reach the clock, and provide a defined reset path so the count restarts predictably after power cycling. Select pull-up or pull-down components and input levels according to the manufacturer’s input-current and logic-threshold specifications. During validation, compare the counter output with a reference pulse source to confirm that no transition is missed at the maximum expected event rate.
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Digital Timer
The CD4018AK supports preset-and-count timer architectures in which an initial count establishes the timing interval and each clock pulse advances the counter toward a terminal output condition. Its divide-by-N behavior avoids a microcontroller for fixed intervals, while the wide -55°C to 125°C operating range allows use in demanding timing systems. The circuit must account for oscillator accuracy, counter propagation delay, and the difference between nominal and worst-case timing if production tolerances are critical. Reset and preset controls should be debounced or held in defined states during startup so that the timer does not begin from an unintended count. Use the manufacturer timing diagrams to assign output taps and verify that the selected counter stage provides the required interval. For longer intervals, a multi-stage counter such as CD4020BK may be more convenient.
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Test and Measurement Equipment
The CD4018AK can serve as a programmable event divider or counter element inside bench instruments, automated test systems, and signal-analysis fixtures. Its presettable behavior permits repeatable test intervals, while the broad -55°C to 125°C temperature specification supports instrument prototypes and equipment exposed to variable ambient conditions. The DFP-16 package permits a compact layout, but accurate results depend on clean clock edges and correct handling of asynchronous reset or preset controls. Establish a defined initialization sequence so that every measurement starts from the same count, and route the clock away from sensitive analog and high-impedance nodes. Compare divided outputs against a known reference frequency during characterization, accounting for propagation delay and rise time. For binary-only division with more stages, compare the implementation with CD4020BK.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für CD4018AK – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | CD4018AE | CD4018AH | CD4018AJ |
|---|---|---|---|---|
| Brand | Harris Corporation | Harris Corporation | Harris Corporation | Harris Corporation |
| Package | DFP-16 | DFP-16 | DFP-16 | DFP-16 |
| Counter Type | Presettable Divide-by-N Counter | Presettable Divide-by-N Counter | Presettable Divide-by-N Counter | Presettable Divide-by-N Counter |
| Counter Element Count | 1 element | 1 element | 1 element | 1 element |
| Terminal Count | 16 terminals | 16 terminals | 16 terminals | 16 terminals |
Wichtigste Unterscheidungsmerkmale
- Confirmed military-temperature operating envelope (vs. CD4018AE)
- Same counter architecture with order-code family interchangeability (vs. CD4018AH)
- Pin-compatible family option for planned sourcing changes (vs. CD4018AJ)
Designhinweise
Do not substitute the CD4018AK for a dual-inline CD4018 variant without checking the physical outline and terminal sequence. The CD4018AK is identified as a 16-terminal rectangular flat package, while CD4018 family ordering codes can denote different package or temperature constructions. Review the manufacturer drawing and pin-description table together, then confirm that the PCB land pattern matches terminal numbering and orientation. A functional-equivalent counter with a different footprint is not a drop-in replacement.
Keep the clock path compact and prevent slow or noisy transitions from reaching the clock terminal. Although a counter can count external events, propagation delay limits the usable input frequency and allows timing uncertainty to accumulate. Use the manufacturer’s maximum-clock-frequency and output-transition specifications when selecting the source. Where events come from contacts or long cables, add suitable conditioning before the counter and provide a defined reset state so power-up transients cannot create an incorrect count.
Place the supply bypass capacitor close to the device and route it using a short return path. The catalog record does not state the recommended capacitance, so follow the manufacturer application schematic rather than assuming a value from another CD4000 device. Likewise, preserve clearances between the counter and adjacent switching circuitry. The flat package requires careful assembly planning because lead alignment, package orientation, and terminal numbering are not visually interchangeable with a through-hole DIP footprint.
Compliance-Informationen
The reviewed product records identify a military temperature grade but do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the device is classified as a logic IC rather than an automotive-qualified product.
