P82B96P - 2-Channel 400kHz I2C Buffer | Texas Instruments
料号： P82B96P ✓ 量产中P82B96P 概述
An I2C bus buffer is a signal-conditioning semiconductor that isolates or extends bus nodes, reduces loading, and can translate between logic domains. In the interface hierarchy, the P82B96 belongs to the I2C controller/buffer and extender class, then to bus-interface ICs and interface semiconductors. Its purpose is to improve compatibility among I2C master and slave devices operating across logic levels from 2 V to 15 V.
Key features include two bidirectional channels, a 2 V to 15 V operating power-supply range, and a stated 400 kHz operating frequency. The device supports bidirectional data transfer and can connect buses with different voltage and current levels. The PDIP package is suitable for conventional through-hole assembly and prototyping, while its non-latching design avoids requiring an explicit direction-control signal.
Technically, the P82B96 uses slightly different logic-low voltage levels on the Sx/Sy side to prevent latching in bidirectional operation. The manufacturer states that two or more Sx or Sy I/O nodes must not be connected together on the same node because the design does not support that configuration. Bus capacitance, rise time, pull-up resistance, and logic-level limits must therefore be checked during implementation.
Typical uses include isolating I2C subsystems, connecting devices operating at 2 V through 15 V logic levels, interfacing with SMBus-style systems, and improving electrical loading on longer bus segments. The P82B96 is also appropriate when a standard bus needs an intermediate buffer node rather than a directional translator.
For PCB implementation, preserve the manufacturer-recommended pull-ups on each bus side, keep the buffer close to the bus split, and route each side as a continuous bidirectional node. Do not combine multiple Sx or Sy outputs on one node. Confirm timing, voltage, capacitance, and logic-level compatibility before treating the 400 kHz rating as guaranteed for a particular bus.
This page consolidates manufacturer and distributor information, replacement assessment, timing considerations, and practical design guidance for engineers evaluating the P82B96P.
直接替换替代料： P82B96P ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： P82B96P （相同外形与封装尺寸） ——差异在于 Package, Mounting Type, Number of Channels, RoHS Status.
P82B96P
✅ 直接替换联系询价
查看数据手册 →P82B96TD
✅ 直接替换联系询价
查看数据手册 →P82B96P 规格参数
| Product Type | 2-bit bidirectional I2C/SMBus buffer and cable extender |
| Number of Channels | 2 channels |
| Operating Supply Voltage Range | 2 V to 15 V |
| Maximum Stated Operating Frequency | 400 kHz |
| Bus Compatibility | I2C and SMBus |
| Data Direction | Bidirectional |
| Interface Architecture | Non-latching bidirectional bus interface |
| Direction Control Input | None |
| Supported Logic Levels | 2 V to 15 V |
| Sx/Sy Same-Node Connection | Not supported |
| 封装 | 8-pin PDIP |
| 安装类型 | Through-hole |
P82B96P 8-pin pdip 引脚配置指南
P82B96P（8-pin pdip 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： P82B96P.
请参阅 数据手册 以查看完整引脚配置。
典型应用
P82B96P 适用于 6 应用s: Bidirectional I2C Bus Isolation, Mixed-Voltage I2C Interfacing, SMBus-Compatible Buffering, I2C Bus Extension, Legacy-to-Modern Bus Bridging, Noisy or Long I2C Traces.
Bidirectional I2C Bus Isolation
The P82B96P fits between two I2C segments that must exchange SDA and SCL data in both directions without a separate enable or direction-control signal. Its two channels match the two-wire bus, while the verified 2 V to 15 V operating range supports interfaces spanning traditional low-voltage I2C and higher-voltage bus devices. Install pull-ups on both sides, keep each Sx/Sy node isolated from other buffer outputs, and verify that propagation delay and capacitance remain inside the system timing budget at the selected frequency.
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Mixed-Voltage I2C Interfacing
The P82B96P is appropriate when SDA and SCL devices use logic levels within different parts of the verified 2 V to 15 V range. It creates a non-latching interface between buses with different voltage and current levels rather than applying a fixed one-way translation rule. The engineer must still confirm each side’s input thresholds, output-low behavior, pull-up voltage, bus capacitance, and timing in the complete datasheet. This arrangement is useful for isolating legacy or higher-voltage nodes from a modern low-voltage controller.
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SMBus-Compatible Buffering
The P82B96P can buffer an SMBus-compatible connection when both SDA-equivalent and SCL-equivalent nodes require bidirectional isolation or different voltage and current domains. The two-channel topology follows the non-latching bus-buffer concept described by the manufacturer, avoiding a separate direction pin. Because SMBus timing and transaction requirements can differ from ordinary I2C, confirm rise and fall times, pull-up values, timeout behavior, and the device’s exact logic thresholds before deployment. The 400 kHz rating should be validated against the assembled bus.
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I2C Bus Extension
The P82B96P can divide an I2C system into separate buffered nodes, reducing the electrical loading presented when several peripheral branches would otherwise share one long bus. Each buffered channel provides a distinct bidirectional path for SDA and SCL, and the manufacturer identifies the device as a bus extender. Actual extension distance is not fixed by the 2 V to 15 V and 400 kHz ratings; it depends on cable capacitance, pull-up resistance, rise time, noise, and peripheral loading. Measure the final physical bus rather than selecting distance from the frequency rating alone.
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Legacy-to-Modern Bus Bridging
The P82B96P can bridge two bidirectional two-wire nodes when legacy equipment uses a higher logic voltage and a modern controller uses a lower one. The verified 2 V to 15 V range provides the broad interface envelope, while separate Tx/Rx and Sx/Sy sides allow the level relationship to be evaluated on each channel. This is not a general-purpose protocol translator: clock stretching, arbitration behavior, rise time, and the manufacturer prohibition on joining multiple Sx or Sy nodes must be checked. Bench validation is essential in equipment with undocumented bus behavior.
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Noisy or Long I2C Traces
The P82B96P can split SDA and SCL into separate buffered nodes when routing through a long PCB or cable run makes loading and signal integrity harder to control. Buffering may help isolate capacitance and noise sources, but it does not replace correct pull-ups, short return paths, or impedance-aware routing. Keep each side’s pull-ups physically close to that side’s devices and use continuous bidirectional nodes. If operation near the stated 400 kHz maximum is required, verify rise time and propagation delay with an oscilloscope under worst-case loading.
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推荐产品汇总
工程参考数据： P82B96P ——对比、设计指导和合规信息。
选型指南
The verified data does not identify five independent same-footdrop-in replacements. P82B96 family ordering codes should be checked with TI before substitution, while P82B96DGKR and PCA9557D are not substitutes for an existing P82B96P board despite functional or package-family proximity. For an existing PDIP PCB, retain P82B96P or obtain a manufacturer-confirmed orderable equivalent with the same eight-pin footprint and pinout. For a new board, package choice can be revisited, but electrical timing and logic thresholds remain more important than distributor availability.
与替代料对比
| 参数 | 本产品 | P82B96P | P82B96 | P82B96PN | PCA9557D |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 |
| Function | 2-bit bidirectional I2C/SMBus buffer | 2-bit bidirectional I2C/SMBus buffer | 2-bit bidirectional I2C/SMBus buffer | 2-bit bidirectional I2C/SMBus buffer | 8-bit I/O expander |
| Channel Count | 2 channels | 2 channels | 2 channels | 2 channels | 8-bit port |
关键差异点
- Purpose-built two-channel bus buffering （对比 PCA9557D)
- Broad verified operating range （对比 PCA9557D)
- Non-latching bidirectional operation （对比 PCA9557D)
设计说明
Do not connect two or more Sx or Sy I/O nodes to the same physical node. The TI datasheet explicitly states that the P82B96 does not support this configuration. Treat every Sx/Sy channel as a separate bidirectional interface between its corresponding Tx/Rx and bus side. This prevents accidental contention and preserves the non-latching operation that distinguishes the device from a conventional directional level translator.
Validate the complete two-wire bus at the intended 400 kHz operating point. Check pull-up resistance against each side’s capacitance, verify SDA and SCL rise and fall times, and include buffer propagation delay in the timing budget. The verified manufacturer excerpt cites a 425 ns worst-case I2C rise-time allowance. A 400 kHz device rating does not guarantee a particular system result when cable capacitance, weak pull-ups, noise, or slow peripheral inputs are present.
Place pull-up resistors on the bus side they serve and keep each side electrically continuous; do not route SDA or SCL through uncontrolled junctions. Preserve the 8-pin PDIP footprint and verify orientation from the official pin table because the supplied verified excerpts do not include the complete pinout. Provide a direct ground return and keep the buffer near the bus split so stub branches remain short and their added capacitance does not degrade rise time.
合规信息
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not applicable because the product is an interface buffer rather than an automotive-qualified device, but no automotive qualification claim was provided.