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74HC238PW

3 对 8 解码器/解复用器，高电平有效输出，3 个使能输入，2-6V，TSSOP-16，-40~125C，与 74HC138 相似，但非反相

85000

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制造商零件：

74HC238PW

包装：

TSSOP-16 (SOT403-1) (5.0 x 4.4 x 1.2 mm)

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说明

Nexperia 的 74HC238PW 是一款高速 Si-gate CMOS 3-8 线路解码器/解复用器，采用 TSSOP-16 封装 (SOT403-1，5.0 x 4.4 mm)。它接受三个二进制加权地址输入（A0、A1、A2），启用后可提供 8 个互斥的高电平有效输出（Y0 至 Y7）。通过三个使能输入（两个低电平有效 E1、E2 和一个高电平有效 E3），只需使用四个 74HC238 器件和一个反相器，就能轻松并行扩展为 1-32 解码器。74HC238 与 74HC138 相似，但具有非反相（高电平有效）输出。电源电压：2.0V 至 6.0V（74HC），4.5V 至 5.5V（74HCT）。传播延迟：18ns typ（4.5V 时）。输出驱动+/-4mA。静态电源电流：6.0V 时最大 40uA。功率耗散：500mW（TSSOP-16 在 60C 以上降额为 5.5mW/K）。ESD：HBM 超过 2000V，CDM 超过 1000V。工作温度：-40C 至 +125C。有源产品，符合 RoHS 规范。.

Nexperia 的 74HC238PW 是一款高速硅门 CMOS 3-8 线路解码器/解复用器，采用 16 引脚 TSSOP 封装。它是 74HC/HCT 逻辑系列的成员，与较早的 74LS 低功耗肖特基 TTL 系列具有引脚兼容性，同时具有 CMOS 技术的低功耗和宽电源电压范围。.

74HC238 将三个二进制加权地址输入（A0、A1、A2）解码为八个互斥的高电平有效输出（Y0 至 Y7）。当器件启用时（E1=低电平，E2=低电平，E3=高电平），与二进制地址相对应的输出被驱动为高电平，而所有其他输出保持低电平。当设备禁用时（不满足任何启用条件），所有输出均为 LOW。.

74HC238 与更常见的 74HC138 的主要区别在于输出极性：74HC238 的输出为有源高电平，而 74HC138 的输出为有源低电平。在需要高电平有效芯片选择的存储器芯片选择解码中，这种差异非常重要。使用 74HC238 就无需使用反相器缓冲器，从而节省了电路板空间和传播延迟。.

三个使能输入提供了灵活的扩展能力。两个低电平有效使能输入端（E1、E2）和一个高电平有效使能输入端（E3）可将四个 74HC238 器件组合成一个 5 至 32 线路解码器，而无需额外的逻辑门（一个反相器除外）。每个 74HC238 处理不同的 8 输出段，两个高阶地址位通过简单的解码方案驱动使能输入。这种级联能力使 74HC238 成为内存映射系统中地址解码的理想选择。.

通过将数据信号应用到其中一个低电平有效使能输入端（E1 或 E2），同时将其他使能输入端用作选通，该器件还可用作 1-8 解复用器。地址输入选择接收数据的输出，其余输出保持低电平。这种解复用器模式适用于将时钟信号、使能脉冲或串行数据分配到八个目的地之一。.

所有输入端都集成了输入钳位二极管，允许使用限流电阻器将输入连接到超过 VCC 的电压。这一功能在混合电压系统中非常有用，因为在混合电压系统中，输入信号可能来自更高的电压域。.

74HC 变体的工作电压范围很宽（2.0V 至 6.0V），采用 CMOS 输入开关电平，而 74HCT 变体的工作电压范围为 4.5V 至 5.5V，采用 TTL 兼容输入开关电平。两种变体具有相同的引脚布局和功能特性，仅输入阈值电压不同。在与 TTL 或 5V CMOS 逻辑连接时，建议使用 HCT 变体，而在低电压和电池供电应用中，则首选 HC 变体。.

TSSOP-16（后缀 PW）封装是该器件最紧凑的通孔/表面贴装选项，体宽 4.4mm。其他可用封装包括 SO-16（后缀 D，3.9mm 体宽）、SSOP-16（后缀 DB，5.3mm 体宽）和 DHVQFN-16（后缀 BQ，2.5 x 3.5mm，无引线）。.

74HC238PW 作为组合逻辑解码器运行，可将 3 位二进制地址转换为八个高电平有效输出之一。.

解码器逻辑：核心功能通过 AND-OR 逻辑门实现。每个输出 Y(n) 都由一个 AND 逻辑门驱动，该门将解码地址输入和使能信号作为输入。输出 Y0 为高电平的条件是A0=低、A1=低、A2=低、E1=低、E2=低、E3=高。同样，Y5 为高电平的条件是A0=高电平、A1=低电平、A2=高电平，且所有使能均有效时，Y5 为高电平。完整的解码逻辑确保在设备启用时，任何时候都有一个输出（或无输出）为高电平。.

地址解码：三个地址输入（A0、A1、A2）代表一个从 0 到 7 的 3 位二进制数。A0 是最小有效位，A2 是最大有效位。输出 Y(n) 与二进制地址的十进制值相对应：地址 000 选择 Y0，地址 101 选择 Y5，地址 111 选择 Y7。.

启用逻辑：三个使能输入通过 AND 函数组合：使能 = NOT(E1) AND NOT(E2) AND E3。只有满足所有三个使能条件（E1=低电平、E2=低电平、E3=高电平），解码器才会激活所选输出。当未满足使能条件时，无论地址输入是什么，所有输出都会强制为低电平。这种使能逻辑有多种用途：(1) 允许完全禁用设备，以防止总线争用；(2) 提供级联机制，以构建更大的解码器；(3) 允许设备发挥解复用器的功能。.

解复用器操作：要将 74HC238 用作 1-8 解复用器，其中一个低电平有效使能输入端（如 E1）将作为数据输入端，同时将 E2 和 E3 分别置低和置高。地址输入端选择接收数据的输出端。当 E1 为低电平（数据=1）时，所选输出为高电平。当 E1 为高电平（数据=0）时，所有输出均为低电平，与地址无关。因此，E1 上的数据被路由到选定的输出端，数据在输出端为高电平有效（因为使能为低电平有效，反转了数据极性）。.

级联 5-32 解码：使用两个高阶地址位（A3、A4）启用相应的器件，四个 74HC238 器件可实现 5-32 线路解码器。一个简单的 2-4 解码器（或两个反相器和一些 NOR 门）从 A3 和 A4 产生四个使能信号。每个 74HC238 在其地址范围内处理八个输出。较低的三个地址位（A0、A1、A2）并行连接到所有四个器件。每次只启用一个设备，因此所有 32 个输出中只有选定的输出为高电平。.

CMOS 实现：74HC238 采用硅门 CMOS 技术，由互补 N 沟道和 P 沟道 MOSFET 构成逻辑门。与双极 TTL 相比，CMOS 具有以下几个优点：(1) 静态功耗几乎为零（只有输入稳定时才有漏电流）；(2) 电源电压范围宽（2.0V 至 6.0V）；(3) 轨至轨输出摆幅，抗噪能力强；(4) 对称输出驱动能力（+/-4mA 源和灌电流）。VCC=4.5V 时的传播延迟约为 18ns，足以满足大多数地址解码应用的需要。.

输入钳位二极管：所有输入引脚和 VCC/GND 之间都连接有集成钳位二极管。这些二极管可限制超出电源轨的输入电压偏移，保护输入栅极免受静电放电和过压的影响。它们还允许使用串联限流电阻来连接更高的电压信号，因为钳位二极管将导通并限制输入电压，而电阻则限制电流。.

针脚 名称 类型 说明
1 A0 输入 地址输入位 0（最小有效位）；用于选择哪个输出处于激活状态；HC 变体为 CMOS 输入电平；HCT 变体为 TTL 电平
2 A1 输入 地址输入位 1（中间位）
3 A2 输入 地址输入第 2 位（最有效）；决定选择哪一组输出（Y0-Y3 或 Y4-Y7）。
4 E1 输入 使能输入 1；低电平有效；设备解码时必须为低电平；在解复用器模式下可用作数据输入；如果不用于使能控制，则与 GND 连接
5 E2 输入 使能输入 2；低电平有效；设备解码时必须为低电平；在解复用器模式下可用作数据输入；如果不用于使能控制，则与 GND 连接
6 E3 输入 使能输入 3；高电平有效；设备解码时必须为高电平；如果不用于使能控制，则与 VCC 连接
7 Y7 输出 解码输出 7；高电平有效；当地址=111（A2=1,A1=1,A0=1）且设备已启用时变为高电平
8 接地 电源 接地（0V）
9 Y6 输出 解码输出 6；高电平有效；当地址=110 且设备已启用时变为高电平
10 Y5 输出 解码输出 5；高电平有效；当地址=101 且设备已启用时变为高电平
11 Y4 输出 解码输出 4；高电平有效；当地址=100 且设备已启用时变为高电平
12 Y3 输出 解码输出 3；高电平有效；当地址=011 且设备已启用时变为高电平
13 Y2 输出 解码输出 2；高电平有效；当地址=010 且设备已启用时变为高电平
14 Y1 输出 解码输出 1；高电平有效；当地址=001 且设备已启用时变为高电平
15 Y0 输出 解码输出 0；高电平有效；当地址=000（A2=0,A1=0,A0=0）且设备已启用时变为高电平
16 VCC 电源 电源电压；74HC238 为 2.0V 至 6.0V；74HCT238 为 4.5V 至 5.5V；用 0.1uF 电容器与接地端解耦
应用 说明
内存芯片选择解码 解码高阶地址位，为多达 8 个存储器件生成高电平有效芯片选择信号；3 条地址线可选择访问哪个存储器芯片；高电平有效输出直接驱动芯片选择输入，无需反相缓冲器；多个启用输入支持地址范围分割
I/O 端口地址解码 通过 3 位端口地址为多达 8 个 I/O 端口生成高电平有效选择信号；每个输出可启用一个 I/O 端口；启用输入可与 I/O 读/写信号选通，以进行合格选择；18ns 的传播延迟可支持快速总线周期
1-8 解复用器 将单个数据信号（应用于 E1 或 E2）路由到由地址输入选择的 8 个输出之一；适用于分配时钟使能、中断确认或串行数据通道；数据在所选输出上显示为有效高电平
5-32 线路解码器扩展 四个 74HC238 器件加上一个简单的 2-4 解码器，可从 5 个地址位扩展到 32 个高电平有效输出；每个器件可处理 8 个输出；较高地址位可选择启用哪个器件；无需 74HC138 和反相器
LED 编曲器 根据 3 位计数器输出驱动 8 个 LED，每次激活一个；每个 Y 输出通过限流电阻器驱动一个 LED；计数器增量循环显示 LED；启用输入控制动画的开/关
模型 制造商 兼容性 主要区别
74HC138PW Nexperia 低电平有效输出变体 功能相同，但输出为低电平有效；最常见的解码器；芯片选择或使能为低电平有效时使用；引脚和使能结构相同；传播延迟和功耗相同
74HCT238PW Nexperia TTL 级变体 与 74HC238PW 相同，但具有 TTL 兼容输入阈值（VIL=0.8V，VIH=2.0V）；工作电压仅为 4.5V-5.5V；与 5V TTL 逻辑接口时使用；引脚输出和封装相同
74HC238D Nexperia 同为 SO-16 封装 SO-16 封装（体宽 3.9mm），功能相同；占位面积稍大，但更易于手工焊接；引脚输出相同；当 TSSOP 太小而无法组装时使用
74HC239D Nexperia 双通道 2-4 解码器 双通道 2 到 4 线路解码器，SO-16 中带有高电平有效输出；两个独立的 2 到 4 解码器；当每个部分只需要 4 个解码输出时使用；不同的引脚布局
CD74HC238EE TI 功能等同 德州仪器公司提供的功能相同；DIP-16 引脚布局相同；电气特性相当；制造商不同；用作第二个信号源
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Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

Online Inquiry Form

Support Excel, PDF, CSV format files for full BOM list quotation

Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.

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