CD4018BM - 10 MHz CMOS Divide-by-N Counter | Texas Instruments
Teilenummer: CD4018BM ✓ AktivCD4018BM Übersicht
A CMOS presettable divide-by-N counter is a type of logic counter that uses a Johnson-counter structure to divide an input clock by a programmable integer. The CD4018B family contains five counter stages with buffered outputs. Its preset and reset controls allow a counter state to be loaded or cleared, making it useful in digital timing, sequencing, and industrial control circuits.
Key features include medium-speed operation at 10 MHz typical with a 10 V supply, fully static operation, and 5 V, 10 V, and 15 V parametric ratings. The device also offers a maximum input current of 1 µA at 18 V, standardized symmetrical output characteristics, and a 16-lead surface-mount SOIC package for compact PCB layouts.
Technically, the CD4018BM combines five Johnson-counter stages with counter-preset control gating. Its buffered outputs allow external logic to observe multiple count phases, while the clock, clock-enable, reset, and preset inputs support deterministic state control. Because it is a static CMOS device, its operating characteristics remain stable when the clock is inactive, which is useful in low-duty-cycle equipment.
Typical applications include programmable pulse generators, industrial timers, sequence dividers, frequency dividers, digital time-base circuits, and sequential control logic. The 10 MHz typical operating speed supports moderate-frequency clock division, while the 16-lead SOIC package allows the counter to be integrated into conventional surface-mount control boards.
When using the device, respect the supply-voltage limits and ensure unused inputs are connected to a defined logic level. Keep clock and control traces away from noisy switching nodes, and use decoupling close to VDD. The Q outputs should not be loaded beyond the datasheet output-current limits, particularly when driving multiple external loads.
This product page combines the manufacturer datasheet characteristics with package, application, replacement, and design guidance to help engineers evaluate the CD4018BM without relying on a raw datasheet summary alone.
Drop-in-Alternativen für CD4018BM – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
CD4018BM96
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CD4018BMT
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
CD4018BM Grenzwerte & elektrische Eigenschaften
| Product Type | CMOS presettable divide-by-N counter |
| Counter Architecture | 5-stage Johnson counter |
| Number of Counter Stages | 5 stages |
| Typical Operating Frequency | 10 MHz at 10 V |
| Supply Voltage Parametric Ratings | 5 V, 10 V, and 15 V |
| Maximum Input Current | 1 µA at 18 V |
| Operation Mode | Fully static |
| Counter Type | Divide-by-N counter |
| Counter Bits | 5 bits |
| Clock Edge | Positive edge |
| Output Characteristics | Standardized, symmetrical outputs |
| Static Quiescent Current Test | 100% tested at 20 V |
| Gehäuse | 16-lead SOIC |
| Montageart | Surface mount |
| Package Width | 3.90 mm |
| Package Body Length | 0.154 inch |
| Manufacturer Qualification Test | 100% quiescent-current tested |
CD4018BM 0.154 inch Pinbelegungsleitfaden
Pinbelegung für CD4018BM (0.154 inch-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 CD4018BM.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
CD4018BM ist geeignet für 6 Anwendungs: Programmable Frequency Divider, Industrial Sequence Timer, Pulse and Repetition Rate Generator, Digital Sequencer, Instrument Time-Base Divider, Control Pulse Counter.
Programmable Frequency Divider
The Texas Instruments CD4018BM fits programmable frequency-divider circuits because its five Johnson-counter stages implement divide-by-N operation with buffered Q outputs. According to the manufacturer datasheet, the counter operates at up to a typical 10 MHz with a 10 V supply, making it suitable for dividing moderate-frequency clocks into lower-frequency signals. External preset and control logic establishes the division ratio, while the multiple buffered outputs permit phase-related clock outputs to be selected. In implementation, place the counter close to the driven logic to limit propagation delay, connect the clock and enable pins to clean digital signals, and follow the datasheet truth table for preset and reset sequencing.
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Industrial Sequence Timer
The CD4018BM is appropriate for an industrial sequence timer because it combines a 5-bit presettable counter structure with fully static CMOS operation. According to the Texas Instruments datasheet, the device is parametrically rated at 5 V, 10 V, and 15 V, allowing it to operate from common industrial logic rails while retaining predictable behavior when the clock is stopped. The preset input can establish a repeatable timing state and the clock-enable input can pause or advance the sequence under controller command. Robust implementation requires a defined reset state, controlled preset timing, and protection from noisy relay or power-switching signals entering the clock and control traces.
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Pulse and Repetition Rate Generator
The Texas Instruments CD4018BM can form the central counting element of a pulse or repetition-rate generator by dividing a stable periodic clock and selecting from its buffered Q outputs. According to the manufacturer datasheet, the device reaches a typical 10 MHz operating frequency at 10 V and provides standardized, symmetrical output characteristics. Those outputs can trigger downstream pulse-width shaping, relay, or driver stages more consistently than raw source-clock edges. For a reliable design, use the highest-quality clock source available, keep output loads within the electrical limits, and provide local supply bypassing to prevent counter timing shifts when output stages switch.
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Digital Sequencer
The CD4018BM supports digital sequencing functions because its five Johnson-counter stages expose buffered Q outputs that represent successive count phases. According to the manufacturer datasheet, counter-preset control gating allows an external controller to load or manage the counter state. A designer can therefore derive multiple sequence-enable signals from the Q outputs and combine them with reset or preset commands to create repeatable operating phases. The design should use one dominant clock domain to avoid metastability or inconsistent phase transitions, and every unused input should be tied to a defined valid logic level.
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Instrument Time-Base Divider
The CD4018BM is useful in test and measurement equipment that requires a stable divided clock derived from a higher-frequency reference. Its programmable divide-by-N behavior allows a reference signal to be reduced to a useful repetition or measurement rate, while the typical 10 MHz operating point at 10 V provides ample margin for moderate-frequency requirements. According to the manufacturer datasheet, the device is fully static and tested for quiescent current at 20 V. For instrumentation, preserve clock-edge quality with controlled routing and impedance, isolate sensitive reference paths from digital output loads, and use the reset input to establish a repeatable acquisition state.
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Control Pulse Counter
The CD4018BM can count and divide control pulses in automation and monitoring equipment where an external controller needs a reduced-rate heartbeat or repetition indication. According to the manufacturer datasheet, its positive-edge counting behavior, buffered outputs, and preset controls permit a periodic input pulse train to be reduced and restarted under controlled conditions. A practical implementation should synchronize the pulse source to the counter's allowable input characteristics, debounce mechanical or long-line sources before they reach CLK, and use reset or preset commands carefully to avoid counting an unintended extra edge during initialization.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für CD4018BM – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | CD4018BM96 | CD4018BMT |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-lead SOIC | 16-lead SOIC - same | 16-lead SOIC - same |
| Logic Family | CMOS | CMOS | CMOS |
| Product Function | Presettable divide-by-N counter | Presettable divide-by-N counter | Presettable divide-by-N counter |
| Counter Architecture | 5-stage Johnson counter | 5-stage Johnson counter | 5-stage Johnson counter |
| Counter Bits | 5 bits | 5 bits | 5 bits |
| Typical Operating Frequency | 10 MHz at 10 V | 10 MHz at 10 V | 10 MHz at 10 V |
| Supply Voltage Ratings | 5 V, 10 V, and 15 V | 5 V, 10 V, and 15 V | 5 V, 10 V, and 15 V |
| Clock Edge | Positive edge | Positive edge | Positive edge |
| Special Ordering Detail | CD4018BM | CD4018BM96 suffix | CD4018BMT suffix |
Wichtigste Unterscheidungsmerkmale
- Programmable divide-by-N operation with five buffered counter phases (vs. CD4018BM96)
- Matches the standard 16-lead SOIC footprint (vs. CD4018BMT)
- Supports standard CMOS logic rails with medium-speed operation (vs. CD4018BM96)
Designhinweise
Place the CD4018BM close to the source and destination of its clock signals, and route CLK, clock-enable, reset, and preset as short, continuous digital paths. According to the manufacturer datasheet, the counter contains five Johnson stages, so accumulated propagation delay affects the usable operating rate. Avoid adding test pads or long branches in the clock net, and maintain a continuous ground reference beneath the device to reduce susceptibility to switching noise.
Provide a local bypass capacitor at VDD and a solid ground connection at VSS to keep the counter's switching transitions from disturbing surrounding logic. The device is specified with 5 V, 10 V, and 15 V parametric ratings, so the selected supply rail must remain within the applicable operating range. Keep the bypass path short and use the capacitor and placement recommendations in the manufacturer datasheet rather than adding an arbitrary large capacitor that could increase loop area.
Do not treat reset, preset, and clock-enable inputs as interchangeable. Use the truth table in the manufacturer datasheet to establish a deterministic starting state, account for the edge that occurs while reset or preset is asserted, and connect every unused input to a defined logic level. Undefined control levels can cause unintended count phases and make a seemingly correct board behave differently between power-up and steady-state operation.
Keep the CD4018BM away from high-current switching nodes and provide a quiet return path for its supply and ground pins. The standardized, symmetrical outputs are intended for downstream digital use, but switching loads connected to Q outputs can create feedback through the supply network. Route output traces away from CLK and preset traces where practical, and verify timing margin at the actual supply voltage, temperature, and output loading used in the final system.
Compliance-Informationen
The manufacturer datasheet identifies the CD4018BM as a CMOS logic counter, but the available product information does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status.
