CD4024BE - 7-Bit CMOS Ripple Counter | Texas Instruments
Référence : CD4024BE ✓ ActifCD4024BE Présentation
A binary ripple counter is a digital logic IC that stores a multi-bit count using interconnected flip-flop stages. CD4000-series CMOS counters occupy the logic IC and counter/d divider hierarchy: each successive output changes at a lower frequency than the preceding stage. Unlike 74HC logic, the CD4000 family supports a substantially wider supply-voltage range and is suited to industrial, control, instrumentation, and legacy-compatible systems operating from low-voltage CMOS through higher-voltage CMOS rails.
The CD4024BE provides seven individually available count outputs, a common reset input, and a negative-edge clock transition. Its 3 V to 18 V operating range allows the same counter architecture to operate across multiple supply standards without requiring a level shifter. The 14-pin PDIP package supports conventional through-hole PCB assembly, prototyping, repair, and applications where a surface-mount package would be inconvenient.
The ripple-carry architecture uses master-slave flip-flop stages, so each stage advances when the preceding stage changes. This implementation is appropriate when moderate clock rates, simple frequency division, and directly accessible binary outputs are more important than maximum operating frequency. Because carry propagation is sequential, cumulative propagation delay must be considered when the clock period is short or when all outputs must settle within a tightly defined interval.
Typical uses include binary event counters, divide-by-two through divide-by-128 clock generation, industrial sequence and batch counters, timer reference stages, digital test equipment, and embedded control systems that need a simple count encoded across individual output pins. The CD4024BE is also useful when maintaining an existing CD4000-series design requires a standard PDIP counter with a wide supply range.
For reliable implementation, keep clock rise and fall times within the limits stated by the manufacturer, observe the reset pulse requirements, and allow adequate settling time after the final ripple stage transitions. Decoupling should follow the manufacturer recommendations, while unused outputs should remain properly terminated according to the system’s CMOS conventions. The wide operating range does not eliminate the need to check propagation delay against the intended maximum clock frequency.
This product page consolidates the manufacturer’s functional description, pin and package information, operating limits, genuine drop-in alternatives, and application-specific engineering guidance. It also provides parameter-by-parameter comparisons and practical circuit-design notes for engineers evaluating the CD4024BE against other 7-stage binary counters.
Alternatives de remplacement direct pour CD4024BE — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec CD4024BE (même facteur de forme et même empreinte).
CD4024BEE4
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
HCF4024BEY
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
CD4024BE Valeurs maximales et caractéristiques électriques
| Counter Type | 7-stage ripple-carry binary counter/divider |
| Number of Counter Stages | 7 stages |
| Count Output Width | 7 bits |
| Supply Voltage Range | 3 V to 18 V |
| Clock Edge Sensitivity | Negative-edge triggered |
| Reset Function | High-level reset |
| Logic Family | CD4000-series CMOS |
| Plage de température de fonctionnement | -55 °C to +125 °C |
| Package Type | 14-pin PDIP |
| Total Pin Count | 14 pins |
| Style de montage | Through-hole |
Configuration des broches de CD4024BE
| Broche 1 | CLK — Negative-edge-triggered clock input |
| Broche 2 | MR — Active-high master reset input |
| Broche 3 | Q0 — First binary counter output |
| Broche 4 | Q1 — Second binary counter output |
| Broche 5 | Q2 — Third binary counter output |
| Broche 6 | Q3 — Fourth binary counter output |
| Broche 7 | VSS — Ground reference |
| Broche 8 | Q4 — Fifth binary counter output |
| Broche 9 | Q5 — Sixth binary counter output |
| Broche 10 | Q6 — Seventh binary counter output |
| Broche 11 | VDD — Positive supply input |
| Broche 12 | NC — Not connected |
| Broche 13 | NC — Not connected |
| Broche 14 | NC — Not connected |
Applications typiques
CD4024BE convient pour 6 applications: Binary Event Counter, Clock Frequency Divider, Industrial Sequence Control, Digital Timer Reference, Test and Measurement Equipment, Legacy CMOS Control System.
Binary Event Counter
The CD4024BE suits basic binary event counting because its seven master-slave stages expose Q0 through Q6 directly. Each negative clock transition advances the count from 0 through 127, after which the output wraps back to zero. A high reset level clears the count, allowing a controller to establish a known starting state. This arrangement is useful in laboratory fixtures, production equipment, and educational systems where the accumulated event total must remain available as parallel binary data. The 3 V to 18 V supply range also permits operation across multiple CMOS rail levels.
Recommandé
Clock Frequency Divider
The CD4024BE can divide a periodic clock into lower-frequency binary outputs because Q0 through Q6 correspond to successive stages of division. Q0 provides the first divided output, and higher-order outputs supply progressively lower rates for timers, clock gating, or periodic task generation. Because this is a ripple-carry design, the final stage settles after the preceding stages change. The chosen source frequency must therefore allow sufficient propagation time through all seven stages, as defined by the manufacturer timing characteristics.
Recommandé
Industrial Sequence Control
The seven independent counter outputs make the CD4024BE useful for basic sequencing and step-position control in industrial equipment. External decoding logic can translate Q0 through Q6 into discrete machine states, while the reset input restores the origin state after a cycle completes. Its 3 V to 18 V operating range supports common industrial control voltages, and the -55 °C to +125 °C rating covers a broad environmental range. Timing remains the principal limitation: outputs do not change simultaneously, so downstream circuitry should not assume instant settling.
Recommandé
Digital Timer Reference
A CD4024BE can serve as a programmable timing reference when one portion of a longer counter output is used as a periodic trigger. The binary count supports preselected time intervals without requiring a microcontroller to increment a software counter continuously. Its reset input allows the timing chain to restart after a master timer overflow. For accurate long intervals, account for oscillator accuracy, counter propagation delay, and output jitter; those system-level considerations are separate from the CD4024BE’s own logic timing limits.
Recommandé
Test and Measurement Equipment
The CD4024BE can count external events, generate divide-by-two through divide-by-128 outputs, or provide a parallel binary state for front-panel displays and instrument controls. Its straightforwardlogic behavior simplifies troubleshooting, while the seven accessible outputs support both direct observation and decoded measurement intervals. In laboratory systems, the supply rails should be well decoupled and unused inputs must follow CMOS handling practices. For high-rate pulse trains, verify the maximum transition rate and total ripple settling time rather than relying only on the nominal counter capacity.
Recommandé
Legacy CMOS Control System
The CD4024BE is appropriate for maintaining or extending a CD4000-series control design that uses a broad supply-voltage range and a through-hole PDIP footprint. It can preserve established board dimensions while providing seven counter outputs and a familiar negative-edge clock convention. The part also works well in educational and maintenance systems built around CMOS logic rather than modern low-voltage CMOS families. Before replacement, verify that the existing circuit does not rely on faster switching, greater output current, or stricter output timing than the CD4024B family provides.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour CD4024BE — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | CD4024BEE4 | HCF4024BEY |
|---|---|---|---|
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | STMicroelectronics |
| Counter Stages | 7 stages | 7 stages | 7 stages |
| Clock Edge | Negative-edge triggered | Negative-edge triggered | Negative-edge triggered |
| Reset Level | Active high | Active high | Active high |
| Operating Temperature Range | -55 °C to +125 °C | -55 °C to +125 °C | -55 °C to +125 °C |
Principaux différenciateurs
- Wide supply-voltage operation (vs HCF4024BEY)
- Seven directly accessible binary stages (vs CD4024BEE4)
- Negative-edge-triggered ripple operation (vs HCF4024BEY)
- Broad industrial temperature range (vs CD4024BEE4)
Notes de conception
Do not treat the seven counter outputs as changing simultaneously. The CD4024BE uses ripple-carry stages, so Q0 changes first and Q6 settles last. Select the maximum clock frequency with enough margin for cumulative propagation delay, and do not sample a higher-order output immediately after the clock edge. If simultaneous outputs or high-rate counting is required, evaluate a synchronous counter architecture instead of forcing this device beyond its timing limits.
Use a supply voltage within the 3 V to 18 V operating range and place suitable bypass capacitance close to VDD pin 11 and VSS pin 7. CMOS input nodes can respond unpredictably when left floating, so unused inputs should be tied to a defined logic level rather than relying on leakage. Account for supply-current changes caused by clock activity and output loading when estimating the power budget for a complete counter subsystem.
The 14-pin PDIP footprint supports through-hole assembly, but maintain conventional clearance between adjacent output pins when routing high-impedance clocks or counter lines. Keep the clock trace short and away from noisy switching nodes because excessive coupling can cause an unintended edge. The negative-edge trigger means the falling transition is functional; inspect the reset trace as well because a narrow or noisy reset pulse may fail to clear all counter stages.
Informations de conformité
The manufacturer product page and functional information were available, but explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals declarations were not identified for this exact ordering code.
