P82B715D - 2-Bit 400kHz I2C Bus Extender | Texas Instruments
MPN: P82B715D ✓ Hoạt độngP82B715D Tóm tắt
What is an I2C bus extender? An I2C bus extender, also called an I2C buffer or bus repeater, is an interface IC placed between two bus segments to increase usable bus length and capacitance. It helps a controller and peripheral communicate across wiring where one physical I2C segment alone would be too heavily loaded. The P82B715 belongs to the interface IC hierarchy and separates a main I2C bus from an extended transmission-line segment.
Key features include a 3 V to 12 V operating supply range, 400 kHz signal support, two bidirectional signal channels, and support for higher bus capacitance than the conventional 400 pF I2C limit. According to the Texas Instruments product page and datasheet, the device is intended for I2C and derivative SMBus systems. It is particularly useful when long cables, connectorized wiring, or multiple branches raise total bus capacitance.
The P82B715 uses a split-side arrangement: each buffered path supports a main-bus side and an extended-cable side. This arrangement helps isolate the extended wiring from the main bus and allows the system to tolerate substantially more wiring capacitance. Engineers must still follow the datasheet limits for voltage, current, timing, and cable loading; the part is not a general-purpose differential-line driver.
Typical applications include industrial control modules, sensor networks, test equipment, remote I2C targets, embedded systems, and SMBus-compatible equipment. Its 400 kHz class makes it appropriate for moderate-speed control buses rather than high-speed I2C designs beyond the stated operating range.
Design attention should focus on bus capacitance, pull-up placement, ground continuity, and the separation between main and extended bus sections. Verify signal rise time and timing margin with the actual cable and peripheral loading rather than relying on nominal bus length alone.
This page combines manufacturer specifications, distributor identification, and practical bus-integration guidance to help engineers evaluate the P82B715D for longer or more capacitive I2C wiring.
Bộ thay thế dễ dàng lắp đặt cho P82B715D — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với P82B715D (cùng hình factor và footprint) — khác nhau ở Package, Product Type, Architecture, Bus Type, Interface.
P82B715DR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →P82B715TD,112
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
P82B715TD-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9557D
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PCF8574PW
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →P82B715D Thông số kỹ thuật
| Product Type | 2-bit bidirectional I2C/SMBus buffer and cable extender |
| Operating Supply Voltage Range | 3 V to 12 V |
| Nominal Maximum Bus Frequency | 400 kHz |
| Bidirectional Data Transfer | Supported |
| Number of Buffered Bits | 2 |
| Extended Bus Capacitance | 3 nF |
| Conventional I2C Bus Capacitance | 400 pF |
| Điện áp cung cấp | 22 mA |
| Cung cấp电容 | 3000 pF |
| Delay Time | 250 ns |
| Hộp | 8-pin SOIC (D) |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C |
| Kiểu lắp đặt | Surface mount |
| Bus Type | I2C/SMBus |
| Architecture | Unidirectional analog current amplification |
Hướng dẫn cấu hình chân P82B715D 8-pin soic (d)
Cấu hình chân cho P82B715D (8-pin soic (d) gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho P82B715D.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
P82B715D phù hợp cho 6 Áp dụngs: Industrial I2C Sensor Networks, Remote Sensor Cable Extension, Test and Measurement Equipment, Embedded System Bus Conditioning, SMBus-Compatible Power and Control Modules, Board-to-Board I2C Interconnect.
Industrial I2C Sensor Networks
The P82B715D suits industrial sensor networks where a remote sensor branch introduces more capacitance than a conventional 400 pF I2C bus can comfortably support. Its 3 nF extended-wiring capability and 400 kHz class can help preserve operation across a separated cable segment, while the two bidirectional paths support both clock and data extension. Place the extender between the controller-side bus and the remote branch, then verify pull-up values and rise time against the actual cable and sensor loading. The 250 ns listed delay should be included in system timing analysis, particularly when several peripheral transactions occur in sequence.
Được đề xuất
Remote Sensor Cable Extension
Use the P82B715D when temperature, pressure, or motion sensors are located beyond the practical loading distance of a direct I2C connection. The device's 3 V to 12 V supply range and bidirectional analog current-amplification architecture allow the main bus and extended cable section to operate as separate segments. Its 3 nF extended-capacitance target is useful when connectorized cables or long traces add load, but the design must still include correct pull-ups, protection, and grounding. The 400 kHz operating class should be checked against the sensor's communication timing.
Được đề xuất
Test and Measurement Equipment
The P82B715D can extend I2C control connections between an instrument controller and a remote fixture, where fixture wiring and adapter cables add capacitance. Its 400 kHz bus class and 3 nF extended-bus capability make it a candidate for moderate-speed automated test systems rather than high-speed memory or display buses. Engineers should keep the extender's delay in the timing budget and validate signal integrity with the complete harness. Because test systems often use long or improvised cables, protection, grounding, and defined cable length are especially important.
Được đề xuất
Embedded System Bus Conditioning
The P82B715D is useful in an embedded controller design when a main I2C bus must feed a display board, sensor board, or daughtercard through a protected wiring interface. Its bidirectional 2-bit extender architecture separates the remote load from the main bus and supports 3 V to 12 V operation. The SOIC-8 package simplifies conventional surface-mount layout, but engineers must follow the datasheet pin assignments and place pull-ups where they control rise time and bus capacitance. The added 250 ns delay is acceptable when the system operates within the stated 400 kHz class and has adequate timing margin.
Được đề xuất
SMBus-Compatible Power and Control Modules
The P82B715D can support SMBus-derived control wiring when the connected devices use compatible logic levels and electrical timing. The Texas Instruments product page identifies the part as an I2C/SMBus buffer/cable extender, while the 3 nF extended-capacitance capability helps address wiring beyond the normal 400 pF bus limit. It does not translate SMBus protocols or solve incompatible voltage standards, so designers must verify pull-ups, logic thresholds, and fault behavior across the system. A defined power budget should also include the listed 22 mA supply-current specification.
Được đề xuất
Board-to-Board I2C Interconnect
The P82B715D is suitable for a board-to-board interconnect when the two boards communicate over an I2C bus but are separated by a cable, connector, or long pair of traces. Its bidirectional extender architecture allows the main and transmission sides to be treated as separate bus sections, reducing the load presented by the remote board. The 8-SOIC package supports standard surface-mount assembly, although the actual footprint and pin mapping must be checked against the datasheet. Validate timing at 400 kHz with the actual connector, pull-ups, capacitance, and ground-return arrangement.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho P82B715D — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | P82B715DR | P82B715TD,112 | P82B715TD-T | PCA9557D | PCF8574PW |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (D) | 8-SOIC (P) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Function | 2-bit bidirectional I2C/SMBus buffer and cable extender | I2C re-driver; exact function details not fully verified in supplied data | P82B715 family I2C bus extender | P82B715 family variant; exact details not fully verified | I2C I/O expander; not an extender | I2C I/O expander; not an extender |
Bảo phân biệt quan trọng
- Purpose-built I2C cable extension (vsPCA9557D)
- Wider verified operating class (vsP82B715DR)
- Extended-load capability (vsPCF8574PW)
Ghi chú thiết kế
Treat the P82B715D as a wired-bus extender, not as a general-purpose high-speed differential driver. Keep the main-bus and extended-cable sections physically organized, maintain a continuous ground return, and verify rise time with the actual cable, connectors, pull-up resistors, and peripheral input capacitance. The listed 250 ns delay and 400 kHz class must be included in the timing budget.
Place the extender close to the split between the main I2C bus and the transmission segment. Keep the protected or extended-side traces away from noisy switching nodes, use a solid ground plane, and avoid long parallel runs with unrelated high-current traces. Confirm the SOIC-8 pin assignments against the manufacturer datasheet before finalizing the footprint.
Do not assume that matching the SOIC-8 package makes every I2C interface IC a replacement. A valid drop-in choice must match pin-to-pin side assignments, supply limits, logic behavior, timing, and bus-loading specifications. The supplied alternatives include related TI variants and interface ICs whose full electrical equivalence is not verified, so validate any substitution against the P82B715 datasheet and the existing PCB.
Thông tin tuân thủ
The supplied search results do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance should be confirmed from the current Texas Instruments product documentation.