CD4536BD - Programmable 24-Bit Timer | Texas Instruments
MPN： CD4536BD ✓ 啟用中CD4536BD 概覽
A programmable timer is a timing IC that divides an input frequency into selectable time intervals. The CD4536B belongs to the CMOS counter family within the broader timer and clock-and-timing hierarchy. Its configurable counter length, selectable output stage, and external-clock capability make it useful for periodic-event generation, frequency division, time-delay generation, and industrial control logic without requiring a microcontroller.
The principal feature of the CD4536B is its flexible counter architecture. Each of 16 selectable output taps can provide a different division ratio, while the first eight stages can be bypassed to reduce the counting interval. Its outputs have standardized, symmetrical characteristics, and its quiescent current is tested at 20 V across the 5 V, 10 V, and 15 V parametric ratings. The family is designed to meet the stated JEDEC Tentative Standard No. 13B requirements for B-series CMOS devices.
The CD4536BD combines digital counting with analog RC timing functions. An external clock can be applied when precise system-synchronized timing is required, while the internal oscillator permits stand-alone interval generation with external resistor and capacitor values. The selectable output stages let one oscillator or clock source serve several timing tasks, reducing the number of separate timers required in a control design.
Typical uses include industrial pulse and delay generation, repetitive process-control timers, frequency dividers, low-frequency clock generation, programmable pulse trains, and embedded automation systems. The device is also useful in laboratory and test equipment where a selectable division ratio or independently adjustable RC time constant is needed. It can also complement CMOS divider and oscillator products in broader sequential-control systems.
When designing around the CD4536BD, calculate the RC oscillator timing from the manufacturer datasheet's timing equations and component tolerances rather than treating the nominal frequency as exact. Keep external clock edges within the specified input limits, connect unused inputs to defined logic levels, and place decoupling capacitors close to the supply pins. Verify output rise and fall times when driving long traces or high-capacitance loads.
This product page combines the functional architecture of the CD4536B with practical timing guidance, package information, comparison criteria, and focused design notes. It supports faster part selection by distinguishing timer operation from general-purpose counters and highlighting the design checks that matter most for reliable CMOS timing circuits.
直接替換替代品，適用於 CD4536BD — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： CD4536BD （相同外形與佔位） — 差異在於 Logic Family, Mounting Type, Package, Product Type.
CD4536BM
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CD4536BDW
✅ 直接替換📋 參考替代品（不在目錄中）
CD4536BD 規格
| Product Type | Programmable timer and ripple-binary counter |
| Counter Stage Count | 24 stages |
| Maximum Count | 2^24 count events |
| Minimum Count | 1 count event |
| Selectable Output Stages | 16 stages |
| Output Selection Code | 4 bits |
| Bypassable Counter Stages | 8 stages |
| Clock Source Options | External clock or on-chip RC oscillator |
| Logic Family | B-series CMOS |
| Quiescent Current Test Voltage | 20 V |
| Parametric Test Voltages | 5 V, 10 V, and 15 V |
| Quiescent Current Test Condition | 100% tested at 20 V |
| Output Characteristics | Standardized and symmetrical |
| JEDEC Specification | JEDEC Tentative Standard No. 13B for B-series CMOS devices |
| 封裝 | 16-pin SOIC |
| 安裝類型 | Surface mount |
CD4536BD 16-pin soic 腳位配置指南
CD4536BD（16-pin soic 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： CD4536BD.
請參閱 資料表 以查看完整腳位配置。
典型應用
CD4536BD 適用於 6 應用s: Industrial Process-Control Timers, Programmable Frequency Dividers, RC-Based Pulse Generators, Automatic Test and Measurement Systems, Embedded Automation and Sequencing, Appliance and Control-Timing Circuits.
Industrial Process-Control Timers
The CD4536BD suits industrial process-control sequences that require repeatable delays or periodic trigger events. Its 24 ripple-binary stages allow counting from 1 to 2^24 events, while 16 selectable output taps provide multiple timing ratios from one clock or oscillator. Place the device between the sensor-conditioning logic and actuator-driver interface, and use the selected output to establish an adjustable event interval. Because the RC oscillator depends on component and environmental tolerances, design worst-case timing margins around the intended process timing. The external-clock mode is preferable when synchronization to a system master clock is more important than free-running accuracy.
推薦
Programmable Frequency Dividers
The CD4536BD can divide a reference frequency into several programmable output rates without a microcontroller or a bank of separate dividers. A 4-bit selection code accesses one of 16 counter outputs, while bypassing the first eight stages permits shorter division intervals. Feed a clean periodic signal into the external clock input and select the tap that matches the required output frequency. The resulting family of related division ratios is useful in clock-generation, timing-reference, and pulse-distribution circuits. Validate the maximum operating clock rate and output rise time against the trace capacitance and receiving-device thresholds.
推薦
RC-Based Pulse Generators
The CD4536BD's internal RC oscillator provides a compact way to generate repetitive pulses without an external clock generator. External resistor and capacitor values determine the nominal oscillation period, while selectable counter outputs create related pulse intervals. This arrangement is appropriate for low-speed sequencing, test stimuli, and periodic control functions where long-term absolute frequency accuracy is not essential. Account for resistor tolerance, capacitor temperature coefficient, and supply variation when defining the operating range. If precise timing is required, replace the free-running RC network with a more stable reference clock applied to the external-clock input.
推薦
Automatic Test and Measurement Systems
The CD4536BD is useful in test fixtures that require selectable stimulus intervals without a microcontroller. Its 16 counter outputs can provide several timing ratios from one source, allowing one circuit to control acquisition windows, relay-command delays, or repetitive measurement triggers. Select the counter tap based on the required test duration and route the active-high or active-low output through the fixture's control logic as appropriate. Keep timing-critical traces short and provide local supply bypassing to prevent reference noise from changing the trigger interval. For instrumentation requiring calibrated frequency accuracy, synchronize the device to a laboratory reference rather than relying on an uncalibrated RC time constant.
推薦
Embedded Automation and Sequencing
The CD4536BD supports compact automation blocks where a microcontroller needs a backup or auxiliary timing function. A free-running oscillator or external system clock can trigger delayed events, while the selectable counter outputs coordinate multiple stages of a machine sequence. The 16-pin SOIC package allows placement close to the associated logic and reduces board area compared with discrete oscillators and counters. Determine whether the timer operates independently or resets with the controller, and preserve the required output polarity through appropriate interface logic. This arrangement is particularly useful for deterministic delays, watchdog-style intervals, and repetitive actuator commands that do not justify a full programmable timer peripheral.
推薦
Appliance and Control-Timing Circuits
The CD4536BD can implement recurring control intervals in appliances, environmental controllers, and other compact sequencing systems. Its configurable counter length helps tailor an interval to the controlled process, while its outputs can trigger a relay driver, indicator, or next-stage logic. The free-running RC configuration minimizes external component count, whereas the external-clock configuration allows the appliance controller to establish a common time base. Check output drive capability before attaching a load directly, use an appropriate transistor for relays or other high-current devices, and include a defined reset path so the sequence starts predictably after power application.
推薦
推薦產品摘要
工程參考資料，適用於 CD4536BD — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CD4536BM | CD4536BDW |
|---|---|---|---|
| Product Type | Programmable CMOS timer and ripple-binary counter | Programmable CMOS timer and ripple-binary counter | Programmable CMOS timer and ripple-binary counter |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-pin SOIC | 16-pin SOIC - same | 16-pin SOIC - same |
| Counter Stages | 24 ripple-binary stages | 24 ripple-binary stages | 24 ripple-binary stages |
| Selectable Outputs | 16 outputs selected by a 4-bit code | 16 outputs selected by a 4-bit code | 16 outputs selected by a 4-bit code |
| Clocking Modes | External clock or on-chip RC oscillator | External clock or on-chip RC oscillator | External clock or on-chip RC oscillator |
| Maximum Count | 2^24 count events | 2^24 count events | 2^24 count events |
| Logic Family | B-series CMOS | B-series CMOS | B-series CMOS |
| Output Characteristics | Standardized and symmetrical | Standardized and symmetrical | Standardized and symmetrical |
| Quiescent Current Test Condition | 100% tested at 20 V | 100% tested at 20 V | 100% tested at 20 V |
| JEDEC Alignment | JEDEC Tentative Standard No. 13B for B-series CMOS devices | JEDEC Tentative Standard No. 13B for B-series CMOS devices | JEDEC Tentative Standard No. 13B for B-series CMOS devices |
| Orderable Suffix | CD4536BD | CD4536BM | CD4536BDW |
主要差異化特點
- Selectable timing ratios within one timer (對比CD4536BM)
- Matched SOIC footprint within the CD4536B family (對比CD4536BDW)
- Flexible external-clock or autonomous RC operation (對比CD4536BM)
設計說明
Do not assume that every timer output has the same division ratio. The CD4536BD provides 16 selectable outputs and allows the first eight counter stages to be bypassed. Confirm the selected output against the timing diagram before assigning a delay or frequency. Reset behavior and output polarity should also be checked in the manufacturer datasheet because an incorrect interpretation can shift a control sequence by one complete counter interval.
Place the supply-decoupling capacitor immediately between the supply and ground pins, with a short, low-inductance path to the return plane. Keep the external oscillator resistor and capacitor connections compact so board capacitance and leakage do not materially alter the timing network. When using an external clock, provide a clean signal with a rise time compatible with the CD4536B input requirements and maintain the specified supply limits during all operating states.
The CD4536BD is a CMOS timer, so unused inputs must not float. Pull unused input pins to a defined valid logic level and keep external reset and selection traces away from the oscillator components. Output rise and fall times become important when driving long PCB traces, cables, or high-capacitance loads; buffer such outputs when switching-edge distortion could affect downstream timing or cause excessive crosstalk.
Place the RC timing components near the oscillator pins and avoid routing their nets through areas with high switching activity. A solid ground reference beneath the device helps reduce return-path inductance, while short decoupling connections improve supply stability. For an external clock, provide a continuous ground path beneath the trace and match the source impedance where practical, reducing reflections that could cause extra clock-edge counting.
Estimated: with a 10 V supply, a 5 V output, and a 0.1 mA load, a linear timer architecture could dissipate approximately (10 V - 5 V) × 0.1 mA = 0.5 mW, excluding internal oscillator and dynamic current. Actual dissipation depends on the device's internal architecture, switching activity, supply voltage, and load. Confirm the final value with the manufacturer's operating-current and power-dissipation characteristics.
合規資訊
The manufacturer datasheet identifies JEDEC Tentative Standard No. 13B compliance for the B-series CMOS family. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations were not stated in the product information and therefore remain unknown.