CD4541BF - CMOS Programmable Timer, 20 V | Texas Instruments
料号： CD4541BF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.8004 | $4.80 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
CD4541BF 概述
A programmable timer is a clock-and-timing semiconductor that combines oscillator, counter, reset, and output-control functions. The CD4541B belongs to the CMOS timer and counter hierarchy, where an external resistor-capacitor network establishes the oscillator timing and the internal binary counter divides that frequency into selectable output periods. Its high-voltage 20 V rating provides additional supply-voltage headroom compared with lower-voltage CMOS logic families.
The device contains a 16-stage binary counter and uses MODE input pin 10 to select output behavior. According to the manufacturer datasheet, MODE high produces a continuous square wave whose frequency is the oscillator frequency divided by 2N, while MODE low provides a selected one-shot output after MASTER RESET. Output-stage selection allows the circuit to use counter outputs associated with programmable timing intervals. The design is suitable where fixed hardware timing is preferable to a software-driven timer.
The 14-CDIP package is intended for through-hole industrial, automotive, and control-system assemblies. Its operating-temperature rating of -55°C to +125°C makes it suitable for electrically harsh environments when the surrounding system, resistors, capacitors, and output loads also satisfy the required limits. Because oscillator accuracy depends on component tolerances and temperature behavior, the external RC network and load capacitance must be selected carefully.
Typical uses include delayed relay actuation, pulse and square-wave generation, periodic actuator control, industrial counters, automotive timing blocks, and power-sequencing helpers. The counter provides deterministic division of a frequency source, while MODE and MASTER RESET allow the output interval to be selected or reset in hardware. Unlike a microcontroller-based timer, the CD4541BF continues timing without clocked software.
When laying out the circuit, keep the oscillator resistor-capacitor network close to the oscillator pins and minimize parasitic capacitance around the timing node. Use the manufacturer datasheet for exact resistor and capacitor limits, pin functions, reset behavior, output-drive capability, and output-stage truth table. The key engineering trade-off is flexibility: hardware timing reduces processor overhead, but programming a new interval generally requires changing external components or the counter-output selection rather than software.
直接替换替代料： CD4541BF ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： CD4541BF （相同外形与封装尺寸） ——差异在于 Package, Mounting Type, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
CD4541BE
✅ 直接替换✓ 有现货
$0.0857 / 个
查看数据手册 →CD4541BM
✅ 直接替换✓ 有现货
$0.4392 / 个
查看数据手册 →CD4541BF3A
✅ 直接替换📋 参考替代料（不在目录中）
CD4541BPW
✅ 直接替换📋 参考替代料（不在目录中）
CD4541B-MIL
✅ 直接替换📋 参考替代料（不在目录中）
CD4541B
✅ 直接替换📋 参考替代料（不在目录中）
CD4541BF 规格参数
| Product Type | CMOS programmable timer |
| High Voltage Rating | 20 V |
| Supply Voltage Range | 3 V to 18 V |
| Counter Stages | 16 stages |
| Maximum Count | 65,536 |
| Oscillator Frequency Range | 100 kHz to 6 MHz |
| 电源电流 | 100 µA |
| 工作温度 | -55°C to +125°C |
| 封装 | 14-CDIP |
| 安装类型 | Through-hole |
| Output Control | MODE input on pin 10 |
| MODE-high Output | Continuous square wave at oscillator frequency divided by 2N |
| MODE-low Output | Selected timed output after MASTER RESET |
| Automatic Reset | Automatic power-on reset |
| Timer Components | 2 external resistors and 1 external capacitor |
| Manufacturer | Texas Instruments |
| 生命周期状态 | Active |
CD4541BF 引脚配置
| 引脚 1 | [DATA_NEEDED: pin 1 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 2 | [DATA_NEEDED: pin 2 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 3 | [DATA_NEEDED: pin 3 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 4 | [DATA_NEEDED: pin 4 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 5 | [DATA_NEEDED: pin 5 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 6 | [DATA_NEEDED: pin 6 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 7 | [DATA_NEEDED: pin 7 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 8 | [DATA_NEEDED: pin 8 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 9 | [DATA_NEEDED: pin 9 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 10 | MODE — Selects continuous square-wave or reset-controlled timed output operation according to the manufacturer datasheet. |
| 引脚 11 | [DATA_NEEDED: pin 11 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 12 | [DATA_NEEDED: pin 12 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 13 | [DATA_NEEDED: pin 13 name] — Exact pin function is not available in the supplied verified text. |
| 引脚 14 | [DATA_NEEDED: pin 14 name] — Exact pin function is not available in the supplied verified text. |
典型应用
CD4541BF 适用于 6 应用s: Industrial Periodic Actuator Control, Automotive Timing and Warning Circuits, Square-Wave and Pulse Generation, Delayed Relay and Pulse Output, Programmable Frequency Divider, Test and Measurement Triggering.
Industrial Periodic Actuator Control
The CD4541BF suits industrial periodic actuator control because its external RC oscillator sets the base timing reference and its 16-stage binary counter divides that reference into selectable timing intervals. MODE high produces a continuous square wave, allowing a relay, solenoid, or indicator driver to receive repetitive pulses without relying on a microcontroller timer. The -55°C to +125°C operating specification is useful for electrically demanding industrial environments, although the output driver, relay coil, wiring protection, and supply components must be rated separately.
推荐
Automotive Timing and Warning Circuits
CD4541BF can implement repetitive warning, delay, and pulse-generation functions in automotive or transportation equipment when its supply and environmental requirements are satisfied by the complete design. Its 20 V high-voltage type rating and -55°C to +125°C listed temperature range provide useful margin for harsh conditions. MODE pin 10 can select continuous square-wave operation or a reset-controlled timed output, but the device is not automatically AEC-Q100 qualified, so transient protection, load dumping, grounding, and automotive qualification must be reviewed separately.
推荐
Square-Wave and Pulse Generation
The CD4541BF is appropriate for generating continuous clock-like signals and shaped pulses when MODE is high. Its oscillator frequency is divided by 2N, so selecting a different counter stage changes the output rate without changing the external timing network. This makes it useful for low-cost clock distribution, test excitation, relay repetition, and simple pulse-generation blocks. The verified 100 kHz to 6 MHz oscillator range is a distributor specification; the usable output range must still be checked against the counter division ratio and load requirements in the manufacturer datasheet.
推荐
Delayed Relay and Pulse Output
For delayed relay actuation, the CD4541BF oscillator and counter can generate a timing event that is released through MASTER RESET and the selected output stage. MODE low is intended for the timed output behavior described in the manufacturer datasheet, while MODE high supports continuous square-wave output. The design reduces dependence on firmware and can continue its timing sequence even if the controlling logic is temporarily unavailable. Relay drivers need transistor or MOSFET interfaces, flyback protection, and voltage ratings appropriate for the coil.
推荐
Programmable Frequency Divider
The CD4541BF's 16-stage binary counter makes it useful as a programmable frequency divider when a stable external oscillator reference is available. The counter divides the oscillator signal by a selectable power of two, while the MODE input determines whether the output is continuous or reset-controlled. This arrangement can reduce repeated oscillator drive to logic-friendly timing rates for counters, sequencing blocks, and timing monitors. Component tolerances, oscillator stability, temperature behavior, and output loading determine the practical accuracy of the divided signal.
推荐
Test and Measurement Triggering
CD4541BF can provide repetitive test triggers, gate timing, or delayed pulses in a compact instrument-control circuit. The oscillator and counter create a base timing interval, while MODE pin 10 selects between continuous square-wave behavior and a reset-controlled output mode. Because the timer is hardware-based, it can continue producing a trigger independently of a host controller. The design should use buffered outputs when driving long cables or high-capacitance loads, and should account for the CD4541B output-drive and propagation characteristics in the manufacturer datasheet.
推荐
推荐产品汇总
工程参考数据： CD4541BF ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CD4541BE | CD4541BM | CD4541BF3A | CD4541BPW | CD4541B-MIL | CD4541B |
|---|---|---|---|---|---|---|---|
| Package | 14-CDIP | 14-pin CDIP class; verify exact suffix package | 14-pin package variant; exact package requires verification | 14-pin package variant; exact package requires verification | 14-pin package variant; exact package requires verification | 14-CDIP | 14-CDIP family reference |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | CMOS programmable timer | CD4541B programmable timer | CD4541B programmable timer | CD4541B programmable timer | CD4541B programmable timer | CMOS programmable timer | CMOS programmable timer |
关键差异点
- Integrated programmable timing function （对比 CD4541BE)
- Wide listed operating temperature range （对比 CD4541BM)
- 20 V high-voltage timer family （对比 CD4541BPW)
- Hardware-selectable continuous and timed outputs （对比 CD4541BF3A)
设计说明
The verified CD4541BF supply range is 3 V to 18 V, while the family is identified as a 20 V high-voltage type. Place the timer on a supply rail that stays within the manufacturer limits, add normal bypass capacitance close to the supply pins, and use external transistors or MOSFETs for loads above the device output capability. Do not treat the 20 V rating as permission to exceed the specified 18 V operating supply without checking the datasheet.
Keep the external oscillator resistors and capacitor physically close to the CD4541BF oscillator pins. Minimize trace length and parasitic capacitance around the timing node because board capacitance changes oscillator behavior. Route the MODE input and MASTER RESET away from noisy switching nodes, use a solid ground reference, and place any decoupling capacitor close to the device rather than at the power-supply entry point.
The MODE input is pin 10 and selects the output behavior described in the manufacturer datasheet. MODE high produces a continuous square wave divided by 2N; MODE low uses a selected timed output after MASTER RESET. Confusing the two modes, selecting an unintended counter stage, or assuming all CD4541B suffixes share identical grade and package markings can cause timing or replacement errors. Verify the exact suffix and pinout before production.
The counter output may need buffering when driving long traces, high-capacitance loads, cables, or relay-control inputs. Use a suitable logic buffer or transistor interface and preserve the CD4541B output voltage and timing limits. When the timer triggers sensitive analog or measurement circuitry, keep the clock and pulse-routing paths away from high-impedance nodes and provide a defined return path to reduce coupling.
合规信息
The supplied verified data identifies the device as an active Texas Instruments CD4541BF but does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance must be confirmed from the current manufacturer product documentation before regulated use.
