CD4518BE - Dual BCD Up-Counter, 8 MHz | Texas Instruments
MPN: CD4518BE ✓ AktifCD4518BE Ringkasan
A BCD counter is a digital counter whose four-bit output represents decimal digits from zero through nine. The CD4518 family combines two such counters in one package, allowing a design to maintain two independent count sequences without using two separate counter packages. Within the logic-component hierarchy, it is a CMOS counter IC, a member of the CD4000 logic series and a larger category of clock, timing, and state-sequencing semiconductors.
Key features include two four-bit counting sections, internally synchronous four-stage counting, positive or negative clock-edge operation, and a maximum clock frequency of 8 MHz. Its 3 V to 18 V supply range permits use in conventional 5 V and 9 V logic systems as well as higher-voltage CMOS designs. The PDIP-16 package is suitable for through-hole assembly, prototyping, legacy industrial equipment, and educational or maintenance applications.
Each counter section includes a clock input, a data-enable function, and four decade outputs. The device can be configured for cascading or extended counting when a larger number of decimal positions is required. Because each section uses synchronous internal stages, the output transitions occur on clock edges, allowing the counter to be used in frequency division, event sequencing, decade generation, and general digital timing systems.
Typical applications include decade timing counters, pulse-counting panels, industrial sequence controllers, laboratory test fixtures, digital clocks, programmable counters, and embedded control logic that must represent decimal values directly. The two-counter architecture is particularly useful when a system requires two related count values, such as minutes and seconds, units and tens, or two independent event totals.
Designers should use the manufacturer pin-description table when assigning PCB signals and should account for CMOS input behavior, unused outputs, reset release timing, and clock-edge polarity. This page combines the manufacturer product information, verified distributor listings, cross-reference findings, package details, and practical selection guidance for engineers evaluating the CD4518BE.
Alternatif penggantian untuk CD4518BE — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
MC14518B
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SGS4518B
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
HCF4518B
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
HEF4518B
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TC4518B
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
CD4518BE Spesifikasi
| Counter Type | Dual BCD up-counter |
| Logic Family | CMOS CD4000 series |
| Number of Counter Sections | 2 sections |
| Bits per Counter Section | 4 bits |
| Internal Counter Stages | 4 stages per section |
| Counting Format | Binary-coded decimal (BCD) |
| Frekuensi Bawah Maximum | 8 MHz |
| Supply Voltage Range | 3 V to 18 V |
| Clock Edge Selection | Positive or negative edge |
| Internal Counting Architecture | Internally synchronous |
| Package Type | 16-pin PDIP |
| Total Pin Count | 16 pins |
| Gaya Mounting | Through-hole |
| Rentang Suhu Kerja | -55 C to +125 C |
Konfigurasi Pin CD4518BE
| Pin produk 1 | CLK0 — Clock input for counter section 0 |
| Pin produk 2 | DE0 — Data-enable input for counter section 0 |
| Pin produk 3 | Q0A — Least-significant BCD output for counter section 0 |
| Pin produk 4 | Q1A — BCD output bit 1 for counter section 0 |
| Pin produk 5 | Q2A — BCD output bit 2 for counter section 0 |
| Pin produk 6 | Q3A — Most-significant BCD output for counter section 0 |
| Pin produk 7 | VSS — Ground reference |
| Pin produk 8 | CLK1 — Clock input for counter section 1 |
| Pin produk 9 | DE1 — Data-enable input for counter section 1 |
| Pin produk 10 | Q0B — Least-significant BCD output for counter section 1 |
| Pin produk 11 | Q1B — BCD output bit 1 for counter section 1 |
| Pin produk 12 | Q2B — BCD output bit 2 for counter section 1 |
| Pin produk 13 | Q3B — Most-significant BCD output for counter section 1 |
| Pin produk 14 | MR — Master reset input |
| Pin produk 15 | VDD — Positive supply voltage |
| Pin produk 16 | CE — Clock-enable input |
Aplikasi Umum
CD4518BE cocok untuk 6 aplikasis: Digital Clock and Timer Decades, Industrial Pulse Counting, Digital Sequence Controller, Laboratory Test Equipment, Appliance and Control-System Counters, Frequency Divider and Event Scaler.
Digital Clock and Timer Decades
The CD4518BE fits digital clocks, panel timers, and elapsed-time displays because each section provides a four-bit BCD decade counter. Two independent sections can manage related decimal positions such as seconds and minutes, units and tens, or two count channels without requiring separate counter packages. The 8 MHz maximum clock frequency offers substantial timing margin below the operating limit, while the 3 V to 18 V supply range supports common CMOS rails. Use the manufacturer pin table to identify clock, enable, reset, and decade-output nets, and ensure the chosen display driver accepts the counter’s BCD output code.
Direkomendasikan
Industrial Pulse Counting
The CD4518BE is suitable for industrial pulse-counting modules in which events must be accumulated as decimal values. Its two internally synchronous four-bit BCD counter sections can count different event streams, total cycles, or provide a preset and measurement channel. Operation from 3 V to 18 V supports multiple industrial logic environments, and the 8 MHz clock limit is well suited to sensor or machine-pulse rates. Design the input path for noise immunity, debounce mechanical contacts where necessary, and use the clock-enable and reset functions according to datasheet SCHS076B.
Direkomendasikan
Digital Sequence Controller
A CD4518BE can implement stepped decade sequences for timers, recipe controllers, test fixtures, and repetitive process-control equipment. Each four-bit section advances on the selected clock edge and presents a stable decimal state, allowing external logic to compare its output and advance a machine step. The internally synchronous four-stage architecture helps produce consistent state transitions, while the maximum 8 MHz frequency gives designers flexibility in clocking rate. Use a conservative clock in noisy industrial environments and apply reset synchronization so the counter does not begin from an undefined state during power-up.
Direkomendasikan
Laboratory Test Equipment
The CD4518BE is useful in laboratory counters, pulse generators, and automated measurement fixtures where a decade count must be converted into a readable BCD value. Two counting sections permit simultaneous accumulation of events and totalized cycles, and the 16-pin PDIP package is easy to prototype or service on through-hole test boards. The broad operating-temperature specification of -55 C to +125 C also supports instrument environments outside ordinary room temperature. Keep clock distribution away from analog signal paths and use short, properly terminated traces to preserve predictable counter behavior at high clock rates.
Direkomendasikan
Appliance and Control-System Counters
The CD4518BE can support cycle counting, program-position indexing, and event sequencing in appliance and industrial control systems. Two BCD counter sections in one 16-pin PDIP package reduce component count when a controller must track two decimal-related quantities. Its 3 V to 18 V operating range accommodates several generations of CMOS control electronics, and the maximum 8 MHz clock rate is sufficient for most mechanical and sensor-derived event streams. Tie unused inputs to defined logic levels, provide local supply bypassing, and account for power-on reset behavior in the surrounding controller.
Direkomendasikan
Frequency Divider and Event Scaler
The CD4518BE can divide an incoming event stream into lower-rate decimal counts for downstream display, measurement, or control logic. Its BCD output simplifies interface to decade displays and decimal data registers, while the dual-counter arrangement allows one channel to count events and another to provide a total or stage count. The maximum 8 MHz clock frequency supports many divider ratios, although pulse-width and rise-time requirements must still be checked in SCHS076B. Use a clean clock source, avoid excessive routing capacitance, and ensure output transitions are sampled only after the relevant clock edge.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk CD4518BE — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MC14518B | SGS4518B | HCF4518B | HEF4518B | TC4518B |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Motorola | SGS-Thomson | Harris Semiconductor | NXP Semiconductors | Toshiba |
| Package | 16-PDIP | 16-PDIP | 16-PDIP | 16-PDIP | 16-PDIP | 16-PDIP |
| Counter Type | Dual BCD up-counter | Dual BCD up-counter | Dual BCD up-counter | Dual BCD up-counter | Dual BCD up-counter | Dual BCD up-counter |
| Counter Sections | 2 sections | 2 sections | 2 sections | 2 sections | 2 sections | 2 sections |
| Bits per Section | 4 bits | 4 bits | 4 bits | 4 bits | 4 bits | 4 bits |
| Counting Format | BCD | BCD | BCD | BCD | BCD | BCD |
Diferensiator Kunci
- Two BCD counter sections in one package (vsMC14518B)
- Direct decimal-state representation (vsSGS4518B)
- Same through-hole footprint class for redesign (vsTC4518B)
Catatan Desain
Route the clock input as a short trace directly to the relevant CLK pin and keep it away from switching-power nodes, relay coils, and high-current return paths. Both counting sections use a 4-bit BCD output, so assign Q0 through Q3 consistently with the selected display or controller. Verify the final PCB footprint against the 16-pin PDIP package drawing and confirm pin 1 orientation against the physical board silkscreen.
Do not leave unused CMOS inputs floating. Pull DE, CE, and MR to a defined valid logic level so the counter cannot advance because of leakage, noise, or power-up transients. The master reset should be released synchronously with the clock when a deterministic starting state is required. Also verify clock polarity: the device supports positive or negative edge operation, but the chosen edge must match the counter and cascade design.
Place the supply bypass capacitor close to the VDD and VSS pins, with the ground return connected to the same quiet power region used by the logic. Keep the CD4518BE away from heat sources when operating across the -55 C to +125 C range. The 8 MHz frequency is a maximum operating point rather than a target; clock-generation circuitry must preserve required voltage levels, edge rates, and pulse widths under worst-case loading.
When cascading counting sections or driving external display logic, account for output-transition timing and fanout rather than assuming ideal switching. Use the manufacturer timing diagrams to determine when each BCD output is stable relative to the active clock edge. Sample outputs on the correct side of that edge, and avoid long branches from clock nets that could increase rise time, ringing, or susceptibility to noise.
Informasi Konformitas
The Texas Instruments product page identifies CD4518BE as a 16-pin PDIP counter, but the manufacturer page summary does not state RoHS, REACH, lead-free, halogen-free, or conflict-mineral status. AEC-Q100 is not applicable because CD4518BE is not presented as an automotive-qualified product.
