CD4024BM - 7-Bit CMOS Ripple-Carry Counter | Texas Instruments
MPN: CD4024BM ✓ ActiveCD4024BM Overview
A ripple-carry binary counter is a sequential digital circuit that stores and increments a binary value on each active clock edge. Unlike a synchronous counter, a ripple-carry implementation allows each internal stage to toggle after the preceding stage, which can create accumulated propagation delay between the clock input and the final output. This architecture remains useful when predictable division ratios, inexpensive implementation, and compatibility with classic CMOS logic systems are more important than simultaneous output transitions.
The CD4024BM combines seven counter bits with selectable decoded divide outputs. The direct Q outputs support binary counting from 0000000 through 1111111, while the dedicated divider taps provide modulo-2, modulo-4, modulo-8, and modulo-16 signals. Its negative-edge clocking must be considered when multiple counters are cascaded because ripple transitions can create short timing differences between stages.
The 3 V to 18 V supply range allows operation in both traditional 5 V CMOS systems and lower-voltage mixed-signal equipment. A maximum operating frequency of 24 MHz supports moderate-speed digital timing, event counting, and clock division. Because this is a CMOS logic device, unused inputs should not float; they should be tied to a defined valid logic level to prevent unpredictable current flow and noise sensitivity.
Typical applications include digital frequency division, programmable event counters, industrial timing systems, laboratory pulse generation, sequential control logic, and clock-domain qualification circuits. Because the outputs are ripple-based, the device is especially appropriate for slower counter and divider functions where the final stage does not need to change simultaneously with the first stage.
PCB design should preserve short clock routes, provide an uninterrupted ground reference, and account for the propagation delay through all seven stages when cascaded counters are combined. The manufacturer product page and datasheet should be used to assign inputs and outputs according to the exact CD4024B-family pin description, confirm operating limits, and select appropriate decoupling.
This page combines the core counter and package characteristics, replacement analysis, application guidance, and practical design notes to support faster engineering selection. It also distinguishes directly compatible CD4024-family parts from broader functional equivalents so engineers can focus first on pin-compatible replacement options.
Drop-in alternatives for CD4024BM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CD4024BM (same form factor and footprint) — differing in Mounting Type, Package, Trigger Type.
CD4024BE
✅ Drop-InContact for price
View Datasheet →CD4024BM
✅ Drop-InContact for price
View Datasheet →CD4024BM
✅ Drop-InContact for price
View Datasheet →MC14024BDG
✅ Drop-In📋 Reference alternative (not in catalog)
CD4024BM Maximum Ratings & Electrical Characteristics
| Counter Type | 7-bit binary ripple-carry counter |
| Counter Elements | 1 element |
| Counter Stages | 7 stages |
| Logic Technology | CMOS |
| Counting Direction | Up |
| Trigger Type | Negative-edge triggered |
| Supply Voltage Range | 3 V to 18 V |
| Maximum Operating Frequency | 24 MHz |
| Binary Outputs | 7 parallel outputs |
| Dedicated Divide Outputs | Divide-by-2, divide-by-4, divide-by-8, and divide-by-16 |
| Package | 14-pin SOIC |
| Mounting Type | Surface mount |
| Logic Family | CD4000 CMOS series |
CD4024BM 14-pin soic Pin Configuration Guide
Pin configuration for CD4024BM (14-pin soic package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for CD4024BM.
Refer to the datasheet for full pin configuration.
Typical Applications
CD4024BM is suitable for 6 applications: Digital Frequency Divider, Industrial Event Counter, Pulse Generator and Timer, Digital Batch and Sequence Control, Laboratory Instrumentation, Automotive and Robust Digital Sequencing.
Digital Frequency Divider
The CD4024BM fits digital frequency-divider designs because its seven ripple stages provide binary count states and its dedicated outputs divide the clock by 2, 4, 8, and 16. Connect the input clock to the clock terminal and select the required divider tap. The 24 MHz maximum operating frequency supports moderate-speed division, while the 3 V to 18 V supply range covers 5 V CMOS systems and lower-voltage logic. Because propagation accumulates through the ripple stages, use an oscilloscope or logic analyzer to verify the maximum usable clock rate in the assembled circuit.
Recommended
Industrial Event Counter
The CD4024BM can count external events for industrial equipment, test fixtures, and process-control interfaces while presenting a seven-bit total on the parallel outputs. Its negative-edge trigger defines exactly when the count advances, allowing a sensor or pulse source to be connected without ambiguity at the counting edge. The 24 MHz capability provides ample timing margin for many low- to moderate-rate event streams. Reset the counter through its reset function before each measurement, and account for debouncing or conditioning external sensor signals in the input stage.
Recommended
Pulse Generator and Timer
A CD4024BM-based pulse generator can divide a stable master clock into lower-rate timing signals for sequential test systems. The modulo-2, modulo-4, modulo-8, and modulo-16 outputs offer several related rates from one counter, reducing the number of separate divider stages needed. Its operating range of 3 V to 18 V supports conventional CMOS clock-generation systems. Keep the clock source short and stable, provide local supply decoupling, and verify both frequency division ratio and output jitter at the maximum intended clock rate.
Recommended
Digital Batch and Sequence Control
The seven parallel outputs of the CD4024BM can represent steps in a batch, positioning, or sequencing system. Each negative clock edge advances the sequence, and the four decoded division outputs provide additional timing taps for actuator or control stages. A 24 MHz maximum frequency supports fast internal sequencing, but output transitions ripple rather than occurring simultaneously, so downstream latches or qualification circuits should be used when coherent sampling is required. Reset the sequence at a defined system event to prevent drift after startup.
Recommended
Laboratory Instrumentation
The CD4024BM is useful in laboratory instruments that need predictable binary division, repeatable counting, or a simple status word. The parallel count outputs can be read by a controller, while a divided clock can pace measurement or stimulus updates. Its negative-edge operation should be reflected in the timing diagram of the instrument, and the maximum 24 MHz operating frequency should be checked against the required stimulus rate. A ground plane and short clock routing help preserve timing margin in a mixed analog and digital instrument.
Recommended
Automotive and Robust Digital Sequencing
The CD4024BM can support legacy 5 V digital sequencing modules where a seven-state ripple counter provides a simple binary progression. Its 3 V to 18 V operating range includes 5 V, and the dedicated divider taps can create related timing stages. Automotive qualification status is not established by the available product information, so suitability for a safety-critical vehicle function must be checked separately. For such designs, use the manufacturer qualification documentation and confirm electrical behavior over the complete temperature range before release.
Recommended
Recommended Products Summary
Engineering reference data for CD4024BM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CD4024BE | CD4024BM | CD4024BM | MC14024BDG |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Harris Corporation | Intersil | Motorola |
| Package | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC |
| Counter Type | 7-bit binary ripple-carry counter | 7-bit binary ripple-carry counter | 7-bit binary ripple-carry counter | 7-bit binary ripple-carry counter | 7-bit binary counter |
| Counting Direction | Up | Up | Up | Up | Up |
Key Differentiators
- Provides four dedicated frequency-division outputs in addition to seven binary outputs (vs MC14024BDG)
- Supports a 3 V to 18 V operating range (vs MC14024BDG)
- Offers a directly identified same-manufacturer family option (vs CD4024BM from Harris Corporation)
- Handles clocking to 24 MHz (vs CD4024BM from Intersil)
Design Notes
Do not allow unused CMOS inputs to float. Connect each unused input to a defined valid logic level so that input buffers do not oscillate near the switching threshold. Also confirm the reset polarity and behavior against the manufacturer pin-description table before connecting reset hardware. A floating reset or clock input can produce unpredictable count transitions even when the power supply and layout are otherwise correct.
Treat the CD4024BM as a ripple-carry counter rather than a synchronous counter. The first and last binary outputs do not change at exactly the same time, so downstream circuitry must not assume simultaneous transitions. When two counters are cascaded, include the accumulated clock-to-output delay of the driving stages when defining setup and hold timing at the next device.
Place the supply-decoupling capacitor close to the device and maintain a continuous ground reference beneath and around the SOIC. Keep the clock trace short and isolate it from sensitive analog or high-speed switching nodes where practical. Provide a solid ground path for every output that drives a cable or external module, because long traces can increase noise susceptibility and ringing at the counter outputs.
Use a supply that remains within the CD4024BM operating range while preserving valid CMOS input levels. The 3 V to 18 V capability covers both 5 V and lower-voltage systems, but logic thresholds and timing vary with supply voltage. For battery-powered equipment, verify the complete counter and downstream load across the minimum supply condition rather than evaluating behavior only at the nominal voltage.
Compliance Information
Compliance status is not established by the linked manufacturer and distributor summaries. Confirm RoHS, REACH, halogen-free, conflict-minerals, and automotive qualification status against the current manufacturer documentation before release.
