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PCA9617ADP

Fm+ I2C 中继器，0.8-5.5V 至 2.2-5.5V 电平转换，1MHz，540pF 总线隔离，TSSOP-8，-40~85°C

4000

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制造商零件：

PCA9617ADP

包装：

TSSOP-8 (SOT505-1)（3.0 x 4.4 x 1.1 毫米，0.65 毫米间距）

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说明

NXP Semiconductors 的 PCA9617ADP 是一款电平转换快速模式 Plus I2C 总线中继器，采用 8 引脚 TSSOP 封装（3.0 x 4.4 mm）。它在低电压侧（端口 A：0.8 V 至 5.5 V，正常电平）和高电压侧（端口 B：2.2 V 至 5.5 V，静态偏移电平）之间为 I2C SDA 和 SCL 线路提供双向缓冲和电压电平转换。该器件支持 0 Hz 至 1000 kHz 的时钟频率，在 1 MHz 时支持 540 pF 的双总线，在较低速度时支持高达 4000 pF 的双总线。端口 B 具有 0.55 V 静态偏移，可实现无锁存操作。高电平有效使能输入。5 V 容差 I/O 引脚。ESD 保护超过 5500 V HBM。工作温度范围为 -40°C 至 +85°C。.

PCA9617A 是恩智浦的一款 I2C 总线中继器，可在两个 I2C 总线段之间提供电压电平转换和总线电容隔离。PCA9617ADP 是 TSSOP-8 封装版本，是 PCA9517A 在快速模式速度下的基底面和功能替代品，并具有支持快速模式 Plus (1 MHz) 的额外优势。.

该器件有两个具有不同电压和信号特性的端口。端口 A 的工作电压为 0.8 V 至 5.5 V，具有正常的 CMOS 逻辑电平 - 其输出下拉至接近 0 V（硬低电平），输入阈值为 0.35 × VCC(A)。端口 B 的工作电压范围为 2.2 V 至 5.5 V，静态偏移约为 0.55 V - 其输出下拉至 0.55 V，输入阈值约为 0.45 V。偏移设计可防止闩锁：当端口 B 内部驱动 0.55 V 的低电平时，其自身的输入（阈值 0.45 V）不会将其识别为有效低电平，从而防止器件将自身保持在低电平状态。.

PCA9617A 的主要优势在于总线电容隔离。无论另一端的电容如何，中继器的每个端口对其各自的总线只产生约 7 pF 的电容。这使得系统设计人员能够创建远远超过 400 pF 规格限制的大型 I2C 网络。在 1 MHz (Fm+)时，每侧可支持高达 540 pF；在较低的速度下，每侧可支持高达 4000 pF。.

电平转换可双向进行，无需方向引脚 - 开路漏极 I2C 总线结构本身就支持这种转换。端口 A 上的低电平（低于 0.3 × VCC(A)）接通端口 B 下拉。端口 B 上的低电平（低于 0.4 V）接通端口 A 下拉。这种双向操作对 I2C 协议是透明的，包括仲裁、时钟拉伸和多主场景。.

EN（使能）引脚为高电平有效，以 VCC（B）为基准。当 EN 为低电平时，两个端口驱动器均被禁用，所有 I/O 引脚均为高阻抗。只有当 VCC(A) > 0.8 V 和 VCC(B) > 2.2 V 时，器件才会启用，内部基准沉淀的上电延迟约为 400 µs。.

PCA9617A 已列入恩智浦 15 年产品寿命计划，因此适用于长生命周期的工业和汽车应用。.

**双向开漏缓冲：** PCA9617A 实现了两个相同的通道（SDA 和 SCL），每个通道由一对背靠背连接在端口 A 和端口 B 之间的开漏缓冲器组成。.

**端口 A 到端口 B 的转换：** 当端口 A 上的器件将 SDA_A 拉低至 0.3 × VCC(A) 以下时，端口 B 驱动器启动并将 SDA_B 拉低至约 0.55 V（由于静态偏移，未拉低至 0 V）。当 SDA_A 升至阈值以上时，端口 B 驱动器释放，SDA_B 上的外部上拉电阻将其拉高。.

**端口 B 到端口 A 转换：** 当端口 B 上的设备将 SDA_B 拉低至 0.4 V 以下时，端口 A 驱动器激活并将 SDA_A 拉低至接近 0 V（硬低电平）。当 SDA_B 升至 0.4 V 以上时，端口 A 驱动器释放。端口 A 的硬低电平对于低压工作至关重要，因为它能最大限度地提高 0.8 V 时的噪声裕量。.

**端口 B 上的 0.55 V 偏移意味着，当 PCA9617A 内部将端口 B 驱动为低电平时，产生的 0.55 V 电平高于端口 B 输入阈值（0.45 V？- 不，内部缓冲器输入比输出低 90 mV，约为 0.45 V）。实际上，输入阈值设置比输出下拉电平低 90 mV：输出驱动为 0.55 V，输入阈值为 0.45 V。因此，内部产生的 0.55 V 不会被输入识别为低电平（因为它高于 0.45 V）。这就避免了器件无限期保持低电平的锁存情况。.

**电容隔离：** 每个端口对其总线的负载仅为 ~7 pF。缓冲作用意味着一个总线上的电容不会增加到另一个总线上。每个总线上的上升时间仅由该侧的上拉电阻和电容决定，而不是由系统总电容决定。.

针脚 名称 类型 说明
1 SCL_A 输入/输出 端口 A I2C 时钟；漏极开路 I/O；0.8-5.5V；5V 容差；7pF 典型电容；低电平硬输出（~0V）
2 SDA_A 输入/输出 端口 A I2C 数据；漏极开路 I/O；特性与 SCL_A 相同
3 VCC(A) P 端口 A 电源；0.8V 至 5.5V；使用 0.1µF 旁路；必须大于 0.8V 才能启用
4 接地 G 接地；连接至 PCB 地平面
5 EN I 使能输入；高电平有效；参考 VCC（B）；驱动高电平可使能中继器；低电平可禁用两个驱动器；仅在总线空闲时改变
6 SCL_B 输入/输出 端口 B I2C 时钟；漏极开路 I/O；2.2-5.5V；5V 容差；静态偏移输出（~0.55V）
7 SDA_B 输入/输出 端口 B I2C 数据；漏极开路 I/O；特性与 SCL_B 相同
8 VCC(B) P 端口 B 电源；2.2V 至 5.5V；使用 0.1µF 旁路；启用电压必须大于 2.2V；EN 引脚参考该电源
应用 说明
多电压 I2C 传感器网络 将 1.8V MCU I2C 总线（端口 A）连接至 5V 传感器总线（端口 B）；双向电平转换，无需方向引脚；540pF 隔离允许 5V 侧连接多个传感器；EN 引脚用于 MCU 休眠期间的总线隔离
长距离 I2C 扩展 通过将 I2C 总线分成两段，将其扩展到超过 400pF 的限制；本地总线（低电容，端口 A）和远程总线（高电容电缆，端口 B）；在 100kHz 时支持 4000pF，允许电缆长度超过 10 米；与 P82B96 配对可实现更长的电缆长度
热插拔 I2C 卡隔离 将背板 I2C 总线（端口 B）与插入式板卡 I2C（端口 A）隔离；电容隔离保护背板免受板卡插入瞬变的影响；断电高阻抗防止板卡在无电源时加载总线；EN 引脚由板卡检测信号控制
模型 制造商 兼容性 主要区别
PCA9517ADP 恩智浦 兼容脚本的前身 相同的 TSSOP-8 引脚输出；仅 Fm (400kHz) 与 Fm+ (1MHz)；最大频率较低；用于不需要 Fm+ 速度的传统设计
PCA9617ATP 恩智浦 系列变体 (HWSON8) 采用 HWSON8（2x3mm）封装，具有相同功能；占用空间更小；无引线；适用于空间受限的设计
TCA9406DCUR TI 功能等效 2 通道 I2C 电平转换器；1.65-3.6V 至 2.7-5.5V；1MHz Fm+；VSSOP-8；不同偏移架构；验证多中继器设计的兼容性
ltc4311iddb#trmpbf ADI 竞争性替代方案 I2C 总线加速器（上升时间加速器）；非电平转换器；DFN-8；仅在需要改进上升时间而不需要电压转换时使用
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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
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6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

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If you have inquiries about our quality standards, inspection procedures or product certification documents, 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

 

发货与付款

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

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Contact Information

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