PCA9507 - I2C Bus Extender 3.3V-5V Level Shift | NXP
부품 번호: PCA9507 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.95 | $95.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.69 | $690.00 |
PCA9507 개요
A bus extender, also called an I2C buffer or bus repeater, is an interface IC that sits between a controller segment and a peripheral segment of a two-wire bus. Within the power-management-of-signals hierarchy (bus extender -> I2C buffer/repeater -> interface IC -> semiconductor), its role is to isolate bus capacitance and translate logic levels so that each segment can be optimized independently for drive strength and voltage.
Key features include bidirectional buffering of both SDA and SCL, allowing total bus capacitance to exceed the standard 400 pF single-segment limit by splitting it across segments. The built-in level shift permits a 3.3 V controller to talk directly to a 5 V device rail without discrete MOSFET translators. Support for 18 m of cable is roughly 40x the typical practical I2C length, enabled by the accelerator (active pull-up) circuitry that sharpens rising edges.
Architecturally, the PCA9507 uses a rise-time accelerator on both sides that sources current into the bus during low-to-high transitions, compensating for RC delay on long cables or heavy loads. This keeps duty cycle distortion low at the 400 kHz Fast-mode ceiling. Because it retains all I2C-bus operating modes during level shifts, multi-master and clock-stretching behavior is preserved.
Typical applications include HDMI DDC channel extension between source and display, long-reach SMBus backplanes in servers and telecom racks, and I2C fan-out in industrial control cabinets where sensors sit meters from the master.
Design consideration: allocate adequate pull-up resistance per segment - the accelerator assists edges but does not replace pull-ups; verify segment capacitance budget separately on each side of the buffer.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and application guidance not found in a single manufacturer datasheet.
드롭인 대체품: PCA9507 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PCA9507 (동일 폼 팩터 및 풋프린트) — 차이점: Function, Package, Number of Channels, RoHS Status, Direction Control.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
PCA9517D,118
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
PCA9617A
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
PCA9511AD,118
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$0.96 / 개
데이터시트 보기 →PCA9510ADP,118
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
가격 문의
데이터시트 보기 →PCA9515AD,118
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
TCA9517DR
✅ 드롭인✓ 재고 있음
$0.53 / 개
데이터시트 보기 →PCA9507 사양
| 기능 | 2-wire serial bus extender (I2C buffer/level shifter) |
| Applications | HDMI DDC, I2C-bus, SMBus |
| Level Shift | 3.3 V to 5 V |
| Maximum Bus Length | 18 m |
| 데이터 속도 | 400 kHz |
| Number of Channels | 1 |
| 패키지 | 8-SO (SOIC-8) |
| 실장 유형 | Surface Mount |
| 핀 수 | 8 |
| Rise Time Accelerator | Yes (bidirectional SDA/SCL accelerator) |
PCA9507 8-so (soic-8) 핀 구성 가이드
PCA9507(8-so (soic-8) 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: PCA9507.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
PCA9507 적합 용도: 6 애플리케이션s: HDMI DDC Channel Extension, Long-Reach SMBus Backplanes, Industrial I2C Fan-Out in Control Cabinets, Display and Panel Control Interfaces, Battery Management and Hot-Swap Monitoring Buses, Networking Equipment Management Buses.
HDMI DDC Channel Extension
In HDMI source-to-sink paths, the DDC channel carries EDID and HDCP authentication data over I2C at 100-400 kHz. The PCA9507 fits this application directly because the NXP datasheet explicitly names HDMI DDC as a target bus, and its 3.3 V to 5 V level shift bridges the typical source-side 3.3 V and sink-side 5 V domains transparently. Placed in the DDC SDA and SCL path near the connector, its bidirectional accelerator sharpens rising edges degraded by cable capacitance, and its 18 m extension rating comfortably covers long in-wall or rack HDMI runs. The trade-off is added propagation delay, negligible at DDC speeds but worth confirming in HDCP timing margins.
추천
Long-Reach SMBus Backplanes
Server, telecom, and power-shelf backplanes use SMBus to monitor PSU, fan, and hot-swap controllers, and bus lengths of several meters are common between a BMC and far-end modules. The PCA9507 suits this because it retains SMBus operating modes during buffering and its 18 m extension capability exceeds typical rack backplane runs with margin. Its rise-time accelerator compensates for the heavy capacitance of distributed monitoring loads, while the 400 kHz rating covers standard SMBus 100 kHz operation with headroom. Designers should size pull-ups per segment and verify that SMBus clock low extend behavior passes through the buffer as expected in multi-slave trees.
추천
Industrial I2C Fan-Out in Control Cabinets
Industrial control cabinets often place PLC I/O, sensors, and EEPROM configuration devices meters away from the master controller, violating the capacitance-limited reach of a direct I2C bus. The PCA9507 addresses this by isolating capacitance into two segments and actively accelerating edges, enabling 18 m runs through cable trays at 400 kHz. Its 3.3 V to 5 V level shift allows modern 3.3 V microcontrollers to talk to legacy 5 V sensors and serial EEPROMs without discrete translators. Industrial environments should route the buffered bus away from motor drives and contactor switching noise; the accelerator's active pull-up improves noise margin on falling-edge-induced glitches at these distances.
추천
Display and Panel Control Interfaces
Large displays and digital signage panels distribute I2C control buses across backlight, timing, and scaler boards separated by tens of centimeters to meters of flex and cable. The PCA9507 fits because it preserves all I2C operating modes during level shift, keeps EDID and control traffic reliable across board-to-board cabling, and supports the 5 V rails common on panel power boards from 3.3 V scaler chipsets. Its single-channel buffering of both SDA and SCL is sufficient for one control tree; multiple display buses each need one PCA9507. Designers should decouple the buffer supply locally and verify total segment capacitance stays within I2C limits per segment.
추천
Battery Management and Hot-Swap Monitoring Buses
Battery packs and hot-swap shelves serialize SMBus monitoring across cell boards and modules spaced by cable harnesses, creating long, capacitive buses. The PCA9507 is appropriate because its 18 m extension capacity and edge acceleration keep SMBus traffic reliable across harness runs, and its 3.3 V to 5 V translation interfaces 3.3 V gauge MCUs with 5 V SMBus battery modules. Because the accelerator sources current on rising edges, designers must validate that Smart Battery protocol timing and any sleep/wake signaling across the buffer behave correctly; the family datasheets provide application sections covering hot-insertion behavior and recommended pull-up values for each segment.
추천
Networking Equipment Management Buses
Switches, routers, and optical transport gear use I2C/SMBus management buses spanning a chassis, connecting a management MCU to optical modules, temperature sensors, and power monitors distributed across several cards. The PCA9507 suits this topology because the 18 m rating exceeds chassis-scale wire runs, the 400 kHz rate supports fast polling, and level shifting between 3.3 V management planes and 5 V optics or fan trays removes discrete translation stages. Its bidirectional buffering preserves multi-master arbitration used by redundant management controllers. Segment each card or shelf with its own buffer rather than one buffer per chassis, and budget pull-up resistance per segment per NXP application guidance.
추천
추천 제품 요약
엔지니어링 참조 데이터: PCA9507 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | PCA9517D,118 | PCA9617A | TCA9517DR |
|---|---|---|---|---|
| Package | SOIC-8 (8-SO) | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
| Level Shift | 3.3 V to 5 V | 1.0 V to 5.5 V (wider) | 2.3 V/3.3 V to 5 V selectable | 1.65 V to 5.5 V |
| Maximum Data Rate | 400 kHz | 400 kHz | 1 MHz (Fm+) | 400 kHz |
| Rise-Time Accelerator | Yes | Yes | Yes (adjustable) | Yes (accelerator outputs) |
| HDMI DDC Optimization | Yes (primary target) | General-purpose | General-purpose | General-purpose |
주요 차별점
- HDMI DDC-optimized bus extension (vs PCA9517D,118)
- Longer bus reach than non-accelerated buffers (vs PCA9515AD,118)
- Wider low-voltage support in the alternative (vs TCA9517DR)
설계 노트
Place the PCA9507 close to the cable or backplane connector it serves so that the long, capacitive segment sits on the accelerator-assisted side. Decouple the supply with a 100 nF ceramic capacitor directly at the VCC pin, plus a 1 uF bulk capacitor nearby. Keep SDA/SCL traces on the short segment as short and direct as possible; the long segment's edge shaping depends on the buffer seeing clean, low-capacitance connections on the controller side.
Pull-up resistor values must be calculated per segment, not globally. Each side of the PCA9507 forms an independent RC network: choose pull-ups so each segment meets I2C rise-time requirements at 400 kHz given that segment's capacitance. The internal accelerator sources additional current on rising edges but does not replace pull-ups. Estimated guideline: for a 3 m cable segment with roughly 300 pF capacitance, start around 1-2 kiloohm pull-ups and verify rise time on the bench, since the accelerator's dynamic drive changes effective edge behavior.
A common failure is assuming the buffer removes all bus-length limits: the 18 m rating assumes proper per-segment capacitance budgeting and termination. Do not daisy-chain multiple buffers without reviewing segment loading, and remember that level shift direction is fixed at 3.3 V to 5 V - connecting the sides backwards will prevent correct translation. Also verify HDMI HDCP timing with the added buffer delay in the DDC path before tape-out of display designs.
On long cable runs, route SDA and SCL as a modest-impedance pair with ground reference, and avoid running them adjacent to switching power or motor drive harnesses. The rise-time accelerator sharpens edges, which is beneficial for timing but means fast edges can couple into neighboring conductors; maintain spacing or add guard ground on flat-cable implementations. Scope both edges at the far-end device under full load to confirm duty cycle and noise margin.
규정 준수 정보
Compliance data was not present in the provided web data. NXP orderable variant PCA9507D,118 suggests standard NXP lead-free/RoHS ordering suffix; confirm on the official NXP product page.
