P82B715P - 2-Bit 3-12V I2C Bus Extender | Texas Instruments
부품 번호: P82B715P ✓ 활성P82B715P 개요
An I2C bus extender is an interface IC that regenerates or buffers SDA and SCL signals so a heavily loaded bus can operate beyond its original capacitance limit. In the signal-device hierarchy, the P82B715P belongs to the bus-buffer, signal-buffer, interface-IC, and semiconductor categories. It is intended for systems in which cable length, connector loading, or distributed capacitance prevents the controller and peripherals from communicating reliably on a direct I2C bus.
The P82B715 uses analog current amplification to increase the current-sink capability of the connected I2C devices. Its buffered Lx and Ly interfaces are designed to sink the larger currents needed by a 3000 pF capacitive bus, while the Sx and Sy side connects to the source-side bus. The architecture supports bidirectional communication, and the datasheet lists a propagation delay of 250 ns. The verified specification data also identifies 22 mA supply current, 4.5 V to 12 V operating supply in one source, and 3000 pF input bus capacitance.
Typical uses include long sensor cables, industrial control modules, remote I2C peripherals, test fixtures, and systems that divide a capacitive I2C bus into a buffered high-capacitance segment and a controller-side segment. The P82B715P should be selected only when the complete system still meets the controller's timing, voltage, and logic-level requirements. Because the bus is bidirectional, pull-up placement and signal rise-time behavior remain essential design considerations.
For PCB implementation, keep the device connections short and place pull-up resistors on the appropriate bus sections according to the datasheet application guidance. Do not assume that an extender guarantees unlimited cable length: wire resistance, connector capacitance, pull-up strength, bus speed, and the peripheral's sink-current capability can still limit operation. The manufacturer product page and P82B715 datasheet are the primary references for electrical limits and pin behavior.
This product page combines the verified manufacturer and distributor data with application guidance and explicitly identifies missing engineering data instead of estimating it. Use it to compare bus capacitance, voltage, speed, package, and sourcing requirements before committing to a design.
드롭인 대체품: P82B715P — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
P82B715
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
P82B715PN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
P82B715P 사양
| Product Type | 2-bit bidirectional I2C/SMBus buffer and cable extender |
| 동작 공급 전압 | 3 V to 12 V |
| Datasheet Listed Supply Range | 4.5 V to 12 V |
| Bus Signaling Frequency | Up to 400 kHz |
| Bidirectional Channels | 2 |
| Bus Capacitance | 3000 pF on the buffered bus |
| Propagation Delay | 250 ns |
| 공급 전류 | 22 mA |
| 패키지 | 8-pin DIP |
| Package Type | PDIP |
| Signal Type | I2C and SMBus bidirectional signals |
| Buffering Method | Unidirectional analog current amplification |
| Low-Side Interfaces | Lx and Ly |
| High-Side Interfaces | Sx and Sy |
| Bus Application | Highly-capacitive I2C systems |
| Original I2C Bus Limit | 400 pF |
| Buffered Bus Wiring Capacitance Limit | 3 nF |
| 실장 유형 | Through-hole |
| RoHS 상태 | unknown |
| REACH Status | unknown |
P82B715P pdip 핀 구성 가이드
P82B715P(pdip 패키지)의 핀 구성입니다. 핀 번호, 기능, 연결 다이어그램은 제조사 데이터시트에 정의되어 있습니다. 정확한 풋프린트와 솔더링 지침은 해당 문서를 참조하십시오.
다음에 대한 상세 핀아웃 데이터 없음: P82B715P.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
P82B715P 적합 용도: 6 애플리케이션s: Remote I2C Sensor Wiring, Industrial Control Module, Long Cable Sensor Backplane, Test Fixture for Remote Peripherals, Connectorized Sensor Network, Board-to-Board I2C Isolation.
Remote I2C Sensor Wiring
The P82B715P fits remote sensor wiring when cable and connector loading raise the effective bus capacitance beyond the conventional 400 pF I2C limit. Its 2-bit bidirectional architecture carries both SDA and SCL, while the documented 3000 pF buffered-bus capability provides more design margin than a direct connection. Place the extender between the controller-side bus and the remote low-capacitance segment, then verify pull-up values and rise time. The device does not provide level translation, so both sides must remain logic-compatible.
추천
Industrial Control Module
An industrial control module can place the P82B715P between a controller and a heavily loaded field-bus section containing sensors, actuators, or connectorized modules. The device's two bidirectional channels support SDA and SCL extension, and its 3000 pF buffered-bus specification is useful when distributed wiring creates capacitance that the controller cannot directly drive. Maintain compatible supply and logic levels, keep ground returns close to the cable, and validate timing under worst-case temperature and loading conditions.
추천
Long Cable Sensor Backplane
The P82B715P is appropriate for a backplane or cable harness where multiple sensor inputs increase total bus capacitance. Its analog current-amplification approach strengthens the low-level sink capability required by a large capacitive bus, allowing the buffered side to reach 3000 pF rather than relying on a direct 400 pF I2C connection. Cable resistance and ground offsets can still create failures, so use powered buffers near the remote load when the passive extender is not sufficient. Confirm the complete system's rise time and propagation delay.
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Test Fixture for Remote Peripherals
A test fixture can use the P82B715P to isolate a controller from connector and cable capacitance when bringing long or distributed I2C peripherals under test. The two-channel bidirectional buffer helps preserve SDA and SCL communication across the buffered segment, while the 3000 pF capability allows the fixture to represent a more demanding load than a short bench cable. The extender is not a substitute for correct fixture grounding, pull-up placement, or signal-integrity measurement, and it does not automatically support different voltage domains.
추천
Connectorized Sensor Network
The P82B715P can improve reliability in connectorized sensor networks where several cable segments and device inputs accumulate capacitance near the I2C controller's practical limit. Its bidirectional SDA and SCL channels allow the controller-side segment to remain separate from the buffered segment, and its 3000 pF capability provides a defined target for wiring capacitance. Engineer pull-up networks separately, maintain a low-impedance ground path, and avoid relying on the extender to compensate for excessive cable resistance or long unpowered stubs.
추천
Board-to-Board I2C Isolation
For board-to-board I2C connections, the P82B715P can serve as a buffered interface when inter-board wiring and connector loading exceed the direct bus capacitance target. It supports two bidirectional lines, up to 400 kHz operation, and a documented 3000 pF buffered-bus limit. The design must still meet the logic thresholds, supply sequencing, pull-up, and timing requirements of the master and peripheral devices. Use the same bus-side arrangement shown in the manufacturer documentation and verify operation with the final cable and connector.
추천
추천 제품 요약
엔지니어링 참조 데이터: P82B715P — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | P82B715 | P82B715PN |
|---|---|---|---|
| Package | 8-pin DIP | 8-pin DIP | 8-pin DIP |
| Brand | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Product Function | 2-bit bidirectional I2C/SMBus buffer and cable extender | P82B715 family bus extender | P82B715 I2C bus extender |
주요 차별점
- Two-channel bidirectional bus extension (vs P82B715)
- 3000 pF buffered-bus target (vs P82B715PN)
- Explicit 400 kHz operation (vs P82B715PN)
설계 노트
Treat the P82B715P as a capacitive-load solution, not as a guarantee of arbitrary cable length. Calculate total capacitance including controller pins, peripheral inputs, connectors, and cable. Select pull-up values from the desired rise time and the bus capacitance, then measure SDA and SCL at the remote endpoint. The 3000 pF figure is a bus-capacitance capability, not a substitute for rise-time and propagation-delay verification.
Do not use the P82B715P as a voltage-level translator unless the exact device data confirms that function. The controller and remote devices must use compatible I2C thresholds and supply levels. Check the Sx/Sy and Lx/Ly connections against the manufacturer pinout and application diagram, and ensure that pull-up networks are placed on the intended bus sections. Incorrect pull-up placement can cause slow edges, false clocking, or excessive current.
Keep traces between the P82B715P, its supply and ground pins, and the bus connectors short. Provide a low-impedance ground reference for the buffered bus, keep both SDA and SCL routing geometry as similar as practical, and place local supply bypassing close to the device. Since the P82B715P is an 8-pin DIP through-hole part, pay particular attention to socket orientation and connector strain relief rather than assuming the package can tolerate repeated mechanical loading.
규정 준수 정보
The supplied verified snippets do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for P82B715P. Obtain manufacturer documentation for the exact orderable MPN before production release.
