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XINLUDA XL74LS138
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- XINLUDA XL74LS138
- Type
- XINLUDA
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- XINLUDA
- Electronic Component
- XL74LS138
- Electronic Component
- 1
- Package
- SOP-16
- Type
- Decoder
- Electronic Component
- Signal Switch / Codec / Multiplexer
- Electronic Component
- 0.316g
- Electronic Component
- 1
- Electronic Component
- BM0230812303
- Operating Temperature
- 0℃~+70℃
- Operating Voltage
- 4.75V~5.25V
- Power Supply
- Power Supply
- Current(IOH)
- 400uA
- Current(IOL)
- 8mA
- Static Current(Iq)
- 6.3mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
XL74LS138 产品概述
一、概述
XL74LS138（信路达 XINLUDA）是一款典型的三选八译码器/去复用器，基于低功耗 TTL（LS）逻辑族设计，适用于地址译码与信号分配场合。器件采用 SOP-16 封装，工作在标准 5V 电源环境，具有快速响应和较强的下拉驱动能力，适合与微控制器、存储器和其他数字逻辑电路配合使用。
二、主要参数
- 工作电压：4.75V ～ 5.25V（标准 5V TTL 供电）
- 灌电流（IOL）：8 mA（每输出下拉能力）
- 拉电流（IOH）：400 μA（输出上拉/源电流）
- 工作温度：0 ℃ ～ +70 ℃（商业级）
- 传播延迟（tpd）：41 ns（在 VCC=5V、CL=15 pF 条件下）
- 封装形式：SOP-16
- 品牌：XINLUDA（信路达）
三、功能特性
XL74LS138 提供 3 个二进制地址输入，译码成 8 路互斥输出（标准器件为输出低有效）。器件通常带有使能端（组合为高/低有效），使能控制可以将输出整体禁止或允许，从而实现简单的片选逻辑。每路输出具有较强的下拉能力（IOL 8 mA），适合直接驱动小电流负载或作为多路选通信号；输出上拉能力较弱（IOH 400 μA），使用时需考虑上拉电阻或后级输入特性。
四、典型应用
- 地址译码：存储器/外设地址线译码与片选生成
- 数据/信号分配：将单一路信号分配到多路负载（去复用模式）
- 小规模逻辑扩展：在 CPU/MCU 周边扩展更多控制/选择线
- 指示驱动：驱动 LED 指示（前置限流电阻）或指示器件（注意电流限制）
- 反向使能设计：结合使能端实现总线仲裁或多主机选择
五、封装与可靠性
SOP-16 封装利于中密度 PCB 布局与自动化贴装。器件工作温度为商业级（0–70 ℃），适合一般工业与消费类电子环境。推荐在电源引脚附近放置 0.1 μF 陶瓷去耦电容以抑制瞬态噪声，良好接地与电源走线能提高抗干扰性能与延长器件寿命。
六、使用建议与注意事项
- 输入端不要浮置，未使用的输入应拉定到有效电平以避免功耗上升或抖动。
- 输出为低电平活动（通常为 Y0–Y7），若需驱动高电平负载，请配合上拉电阻或上游驱动器。
- 由于 IOH 较小，上拉场合需评估上拉阻值与负载需求；下拉驱动能力较强，可直接驱动轻载。
- 在高频或长走线环境下，注意信号完整性与负载电容（传播延迟随负载电容增加）。
- 与其他 TTL 器件配合时注意总线负载（扇出限制）和上电/断电顺序，避免误触发。
总体而言，XL74LS138 是一颗功能明确、应用广泛的三至八译码器，适合在 5V TTL 系统中实现地址译码与信号选通。根据具体系统需求合理布线与去耦，可以获得稳定、可靠的工作表现。
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