PCA9527DP - 3-Ch HDMI DDC/CEC I2C Bus Buffer | NXP
料号： PCA9527DP ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
PCA9527DP 概述
A bus buffer (also called a bus extender or repeater) is a signal-conditioning device inserted between a master and a slave on a two-wire serial bus such as I2C-bus, SMBus or HDMI DDC. It belongs to the broader family of interface ICs and signal buffers, repeaters and splitters. Its role is to isolate bus capacitance on either side, so each segment sees only its own load, allowing longer cables and more devices than the raw bus standard permits.
Key features of the PCA9527 include three independent bidirectional channels for SDA, SCL and CEC, support for the full 400 kHz Fast-mode I2C-bus operating range, and overvoltage-tolerant SDAx and SCLx pins. Propagation delay is a low 115 ns and input capacitance is only 8 pF, preserving setup and hold margins on long HDMI DDC cables.
Architecturally, the PCA9527 uses open-drain bidirectional buffer stages with rise-time acceleration (buffer accelerator) circuitry. This rising-edge accelerator drives the bus high actively, compensating RC charging losses across long DDC lines while retaining all operating modes of the I2C-bus system during level shifting. According to the NXP datasheet, using the PCA9527 enables the system designer to isolate bus capacitance to meet the HDMI DDC version 1.3 distance specification.
Typical applications include HDMI source and sink equipment (set-top boxes, TVs, monitors, AV receivers) where DDC/CEC lines must traverse cables or backplanes, notebook docking stations, and any system that extends I2C-bus or SMBus segments beyond the standard capacitance limit. The dedicated third channel carries CEC without consuming I2C channels.
Design consideration: keep pull-up resistor values on both bus segments sized per segment capacitance; the accelerator helps but very heavy loads on the downstream side still degrade rise times, so verify rise-time compliance at the far end of the HDMI cable.
This page adds value beyond the manufacturer datasheet by synthesizing distributor availability data, drop-in replacement guidance for this EOL part, practical design notes, and a comparison table in one place.
Note: the PCA9527DP is listed by NXP as End of Life; pricing shown is indicative and all designs should plan a replacement strategy (as of 2026-10-20).
直接替换替代料： PCA9527DP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
PCA9527DPZ
✅ 直接替换📋 参考替代料（不在目录中）
PCA9527DP 规格参数
| 功能 | 3-channel bidirectional open-drain bus buffer (DDC/CEC, HDMI) |
| 通道数 | 3 (SDA, SCL, CEC) |
| 电源电压 | 2.7 V to 5.5 V |
| Operating Frequency | 400 kHz (I2C-bus Fast-mode) |
| Propagation Delay | 115 ns |
| 输入电容 | 8 pF |
| 电源电流 | 100 mA |
| 输出类型 | Open-drain, bidirectional |
| Overvoltage Tolerance | SDAx and SCLx pins overvoltage tolerant |
| 封装 | 10-TFSOP / 10-TSSOP (0.118" width) |
| 安装类型 | Surface Mount |
| Bus Standards Supported | I2C-bus, SMBus, HDMI DDC, CEC |
PCA9527DP 10-tfsop / 10-tssop (0.118" width) 引脚配置指南
PCA9527DP（10-tfsop / 10-tssop (0.118" width) 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： PCA9527DP.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PCA9527DP 适用于 6 应用s: HDMI Source Equipment (Set-top Boxes, Blu-ray Players), TVs, Monitors and AV Receivers (HDMI Sink Side), I2C-bus and SMBus Segment Extension, Notebook Docking Stations and Port Replicators, AV Switchers, Matrices and KVM Extenders, Long-Cable HDMI Runs and Cabling Infrastructure.
HDMI Source Equipment (Set-top Boxes, Blu-ray Players)
HDMI sources must drive DDC (I2C at 100/400 kHz) and CEC signals across cables whose capacitance can far exceed the 400 pF limit of a raw I2C segment. The PCA9527DP sits between the SoC's DDC/CEC pins and the HDMI connector, isolating the board-side capacitance from the cable-side load. Its 115 ns propagation delay and 8 pF input capacitance preserve timing margins, while the rise-time accelerator actively drives the line high to meet the HDMI 1.3 DDC distance specification. Because the SDAx and SCLx pins are overvoltage tolerant, the buffer survives hot-plug events where a powered sink back-drives the lines. The dedicated third channel handles CEC without stealing an I2C buffer.
推荐
TVs, Monitors and AV Receivers (HDMI Sink Side)
On the sink side, an HDMI receiver's EDID must be readable by every source, which means DDC lines traverse connector savers, switch fabrics, and long internal traces with substantial capacitance. The PCA9527DP's bidirectional open-drain buffer stages isolate the EDID EEPROM segment from the connector segment, so the scaler SoC sees a light bus while the connector side remains fully driven. At 400 kHz Fast-mode support, EDID reads complete quickly during hot-plug negotiation. The CEC channel passes one-touch-play and remote-control messaging bidirectionally. Overvoltage tolerance on SDAx/SCLx protects against sources powered at higher levels than the sink's buffer supply, improving robustness across mixed-brand source populations.
推荐
I2C-bus and SMBus Segment Extension
Beyond HDMI, the PCA9527DP is a general-purpose 3-channel bidirectional bus extender for I2C-bus and SMBus per the NXP datasheet. Backplanes, telecom shelves, and industrial controllers frequently exceed the segment capacitance limit imposed by a single bus; inserting the buffer splits the bus into independent capacitance domains while retaining all I2C operating modes, including clock arbitration and multi-master behavior. The open-drain, bidirectional architecture requires no direction-control signal, so it is transparent to existing master firmware. Designers should size pull-up resistors per segment and verify rise time at the farthest node; the accelerator assists but does not eliminate RC-loading effects on very heavy segments.
推荐
Notebook Docking Stations and Port Replicators
A docking station extends the notebook's DDC/CEC lines through the dock connector and then onward to an external monitor cable, easily doubling the bus capacitance beyond spec. The PCA9527DP placed near the dock's HDMI output isolates the notebook-side segment from the monitor-cable segment, ensuring EDID reads succeed across the full range of attached displays. The 2.7 V to 5.5 V supply range matches typical dock 3.3 V rails, and low 8 pF pin capacitance minimizes its own contribution to the loaded bus. Hot-plug robustness is enhanced by the overvoltage-tolerant SDAx/SCLx pins, important in consumer products where users connect and disconnect displays powered at different levels.
推荐
AV Switchers, Matrices and KVM Extenders
Professional AV matrices switch one of many HDMI inputs to an output, and each DDC port accumulates capacitance from muxes, ESD protection, and board routing. The PCA9527DP regenerates the DDC/CEC edges after the switch stage, so the selected source sees a clean, low-capacitance bus regardless of routing length - critical for reliable 100 kHz+ EDID and HDCP authentication traffic, which is timing intolerant. The 115 ns delay is deterministic and small relative to I2C Fast-mode timing. The CEC channel is buffered independently so networked standby and one-touch-play commands propagate between the selected source and sink. This makes the part a common fit in matrix switch and KVM-over-IP local-side designs.
推荐
Long-Cable HDMI Runs and Cabling Infrastructure
The PCA9527's headline use case per the NXP datasheet is enabling system designers to isolate bus capacitance to meet the HDMI DDC version 1.3 distance specification. Wall plates, active cable inline modules, and HDBaseT transmitter front ends place the buffer at the cable head, regenerating DDC edges before the long run attenuates them. With only 8 pF of input capacitance, the buffer adds negligible load at the board side, while its accelerator compensates the RC charging of long-gauge cable conductors. Because CEC is buffered on its own channel, remote-control messaging remains reliable across the full cable length, avoiding the intermittent CEC failures typical of unbuffered long runs.
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推荐产品汇总
工程参考数据： PCA9527DP ——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 | PCA9527DPZ |
|---|---|---|
| Package | 10-TSSOP (10-TFSOP) | 10-TSSOP - same footprint |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Channels | 3 (SDA, SCL, CEC) | 3 (SDA, SCL, CEC) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Max Data Rate | 400 kHz | 400 kHz |
| Propagation Delay | 115 ns | 115 ns |
| Input Capacitance | 8 pF | 8 pF |
| Termination | standard DP ordering code | lead-free (Z) termination |
关键差异点
- Dedicated third CEC channel in one package （对比 TCA9517DR)
- Overvoltage-tolerant SDAx/SCLx pins （对比 PCA9527DPZ)
- Rise-time accelerator for long cables （对比 PCA9306DCTR)
设计说明
Estimated: the 8 pF input capacitance of the PCA9527DP adds to each segment's capacitance budget. Size pull-up resistors per segment independently: for a 400 kHz segment with ~200 pF total load and a 3.3 V rail, a 1 k to 2.2 k pull-up is a common starting point, then verify rise time (<300 ns for Fast-mode) with an oscilloscope at the farthest node. The rise-time accelerator compensates much of the RC loss on long HDMI DDC cables but cannot fix an over-loaded segment.
The PCA9527DP is a buffer, not a level translator. Both DDC segments must operate at compatible logic levels; do not connect a 1.8 V controller segment directly to a 5 V HDMI connector segment expecting voltage conversion. Use an NVT-family translator upstream if rails differ. Also note the part is End of Life per NXP: before releasing a new design, check NXP's discontinuance and replacement notices on the product page and secure last-time-buy stock.
Place a 0.1 uF ceramic decoupling capacitor within 2 mm of the VDD pin, and keep the CEC and SDA/SCL traces short and matched on the connector side. Because the SDAx/SCLx pins are overvoltage tolerant, the buffer can remain connected during hot-plug events, but include the HDMI-specified ESD protection on the connector side - the PCA9527's tolerance is not a substitute for system-level ESD devices.
合规信息
The PCA9527DP is on NXP End-of-Life; compliance data was not included in the provided web data. The Z-suffix (PCA9527DPZ) ordering code conventionally denotes lead-free termination per NXP ordering-code convention - verify on the NXP product page.
