P82B96D - 400kHz Bidirectional I2C Buffer | Texas Instruments
MPN： P82B96D ⚠ 最後購買機會P82B96D 概覽
A bidirectional bus buffer is an interface IC that regenerates and electrically separates a two-wire bus while preserving data flow in either direction. In the signal-conditioning hierarchy, it belongs to the bus-buffer and repeater family within interface ICs. Unlike a one-way level translator, a bidirectional buffer automatically detects the direction of bus traffic and allows either endpoint to become the bus master, making it suitable for I2C and SMBus-compatible links.
The P82B96D operates across a 2V-to-15V supply range and supports bus logic levels from 2V to 15V. According to the Texas Instruments product page and datasheet, it provides two bidirectional I/O paths, a maximum data rate of 400kHz, and compatibility with I2C buses operating at different voltage levels. The SOIC-8 package supports conventional surface-mount assembly while providing separate access to both bus sides.
Its non-latching bidirectional interface avoids a direction-control pin and uses differentiated logic-low behavior to prevent latching. The device can bridge normal I2C logic signals to another bus configuration, including a second P82B96, while its electrical isolation helps limit fault propagation between connected systems. The manufacturer documentation also warns that two Sx or Sy nodes on the same side must not be connected together.
Typical applications include I2C bus extenders, level translation between 2V and 15V domains, SMBus-compatible isolation, cable segmentation, industrial control modules, embedded sensor networks, and test systems requiring a robust 400kHz bus repeater. The device is particularly useful where long interconnects, mixed logic voltages, or removable cable sections could otherwise degrade communication reliability.
When integrating the P82B96D, preserve the I2C pull-up arrangement on each bus segment and keep the buffer close to the bus being extended. Confirm the complete system voltage range, rise-time budget, capacitance, and fault-current behavior against the manufacturer datasheet. The 400kHz rating should not be treated as a guarantee for every cable length or load combination.
This page consolidates manufacturer specifications, distributor availability, verified drop-in alternatives, and practical selection guidance. It highlights the P82B96D’s voltage-range and bidirectional-buffer advantages while clearly identifying details that require confirmation before PCB release.
直接替換替代品，適用於 P82B96D — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： P82B96D （相同外形與佔位） — 差異在於 Package, Function, Supply Voltage Range, Bus Type, Bus Voltage Levels Supported.
P82B96D 規格
| Device Type | Dual bidirectional bus buffer and cable extender |
| Bus Compatibility | I2C/SMBus-compatible |
| Number of Bidirectional Channels | 2 channels |
| Number of Bits | 2 bits |
| Operating Supply Voltage Range | 2 V to 15 V |
| Supported Bus Logic Voltage Range | 2 V to 15 V |
| Maximum Data Rate | 400 kHz |
| Signal Direction | Automatic bidirectional operation |
| Direction Control Pin | None |
| 介面類型 | 2-wire bus |
| 輸入電容 | 4 pF |
| 封裝 | 8-pin SOIC, 3.90 mm width |
| 安裝類型 | Surface mount |
| Manufacturer Description | 2-bit bidirectional 2V-to-15V 400kHz I2C/SMBus buffer/cable extender |
| Product Status | Last time buy |
P82B96D 腳位配置
| 腳位 1 | Sx — Bidirectional I/O for the system-side Sx bus connection |
| 腳位 2 | EN — Device enable input |
| 腳位 3 | Tx/Rx — Bidirectional I/O for the extended-side Tx/Rx bus connection |
| 腳位 4 | VCC — Positive supply-voltage connection |
| 腳位 5 | Ty/Ry — Bidirectional I/O for the extended-side Ty/Ry bus connection |
| 腳位 6 | GND — Ground connection |
| 腳位 7 | Sy — Bidirectional I/O for the system-side Sy bus connection |
| 腳位 8 | VCC — Positive supply-voltage connection |
典型應用
P82B96D 適用於 6 應用s: I2C Cable Extender, Mixed-Voltage I2C Level Translation, SMBus-Compatible Bus Segmentation, Embedded Sensor Network, Industrial Control Module, Removable Cable Interface.
I2C Cable Extender
The P82B96D is suited to extending an I2C-compatible link because it provides two bidirectional bus channels, operates at up to 400kHz, and supports logic levels from 2V to 15V. Place it between a controller-side bus and a remote bus segment, then provide appropriate pull-ups on each side. The buffer can isolate the remote segment from the master bus and limit the effect of a fault or excessive capacitance. Its 400kHz maximum is a device rating, not a guarantee for every cable; engineers should validate rise time, capacitance, pull-up current, and remote-node loading under worst-case conditions.
推薦
Mixed-Voltage I2C Level Translation
The P82B96D can connect I2C-compatible systems operating at different logic voltages within its 2V-to-15V range. It is useful when a low-voltage sensor or controller must communicate with a higher-voltage legacy peripheral without sharing a common I/O voltage. The device automatically handles bidirectional traffic, eliminating a direction-control GPIO. Each side still requires a suitable pull-up arrangement for its own voltage domain, and the complete system must remain within the absolute limits stated in the Texas Instruments datasheet. Validate logic thresholds and bus timing rather than assuming every voltage combination has identical margin.
推薦
SMBus-Compatible Bus Segmentation
P82B96D can provide a physical break between SMBus-compatible segments while preserving automatic bidirectional communication. This topology helps isolate cable capacitance, connector faults, and unintended loading from the upstream controller, improving system resilience. The supported range extends to 400kHz and 15V logic levels, making the device applicable to industrial bus modules that use SMBus-derived signaling. Because P82B96D uses differentiated low-level behavior rather than a direction pin, engineers must follow the manufacturer bus topology and pull-up guidance. Avoid connecting multiple Sx or Sy I/O nodes together on the same side.
推薦
Embedded Sensor Network
The P82B96D fits embedded sensor networks where a controller, remote sensor cluster, and long wiring create excessive bus loading. Its two bidirectional channels can isolate the remote branch from the local I2C bus, while operation up to 400kHz supports relatively fast sensor traffic. The 2V-to-15V range permits the device to bridge multiple logic domains within one design. Place the buffer close to the remote connector or cable entry so that the protected segment contains accumulated capacitance and fault risk. Test the design across temperature and supply extremes because the timing margin of the complete bus depends on wiring, pull-up strength, and device capacitance.
推薦
Industrial Control Module
P82B96D is applicable in industrial control modules that expose an I2C or SMBus-compatible connector to external equipment. The buffer establishes a controlled boundary between controller logic and field-side wiring, while its 400kHz capability preserves adequate throughput for configuration and sensor traffic. Two bidirectional channels allow two isolated signal paths when the board architecture requires them. The 8-SOIC package is easy to inspect and rework during maintenance. Compliance and immunity requirements still depend on the complete module; engineers should verify system-level surge, ESD, temperature, and grounding requirements separately from the IC ratings.
推薦
Removable Cable Interface
The P82B96D can reduce the impact of connecting or disconnecting a removable cable by placing a bidirectional buffer at the cable boundary. A fault confined to the external segment is less likely to pull down the protected controller-side bus, and the buffer separates the two voltage domains. The device supports 2V-to-15V logic and 400kHz operation, which covers many legacy and embedded communication links. Its automatic bidirectional behavior means no firmware direction-control sequence is needed. The design should still define safe-state behavior, validate connector transients, and provide separate pull-ups that suit each bus segment.
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推薦產品摘要
工程參考資料，適用於 P82B96D — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | P82B96TD |
|---|---|---|
| Package | 8-SOIC, 3.90 mm width | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments |
| Device Type | Dual bidirectional bus buffer and cable extender | P82B96-family bidirectional bus buffer |
| Maximum Data Rate | 400 kHz | 400 kHz |
| Bidirectional Channels | 2 channels | 2 channels |
| Bus Compatibility | I2C/SMBus-compatible | I2C/SMBus-compatible |
主要差異化特點
- Wide bidirectional bus operating range (對比PCA9508DP)
- Direct 400kHz I2C cable-extension function (對比PCA9507DP)
- Automatic two-wire direction handling (對比Conventional one-way level translators)
設計說明
Do not connect two Sx or Sy I/O nodes together on the same side of the P82B96. Texas Instruments explicitly states that the design does not support this configuration. A common assembly error is to route both bus channels to the same connector or test point, which can create an unintended parallel path. Review the pin table and schematic against the manufacturer application diagram, and power-down continuity checks should confirm that each side-side node remains independent.
Treat 400kHz as the device maximum, not as a guaranteed system operating point. The complete I2C segment depends on cable capacitance, pull-up resistance, sink current, rise time, and the 4pF input capacitance reported for P82B96D. Check the worst-case total bus capacitance, calculate the available rise-time margin, and test the longest intended cable at temperature extremes. Keep each buffered segment's pull-ups local and compliant rather than allowing one pull-up network to dominate both sides.
Provide a stable 2V-to-15V supply within the operating range and follow the decoupling arrangement in the manufacturer datasheet. Because this is a bidirectional open-drain-style interface, supply noise can affect the thresholds seen by both sides of the buffer. Place the supply and ground return paths close to the device, maintain a low-impedance ground connection, and avoid routing sensitive analog or communications returns through the same noisy current path. Validate enable and power sequencing during startup if the host bus may begin operating immediately.
Place the P82B96D near the boundary where the protected board bus meets the cable or connector rather than midway along the external wiring. Keep the system-side and extended-side traces physically distinct, maintain adequate spacing between adjacent bidirectional nets, and provide a continuous ground reference beneath or alongside the interface. This placement minimizes the unbuffered cable section and improves fault isolation. Check connector pin assignments carefully because reversing Sx and extended-side nets can defeat the intended level-domain arrangement.
合規資訊
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than assumed.
