PI7C9X7954BFDE-MOXA - PCIe Quad UART Bridge | Diodes
부품 번호: PI7C9X7954BFDE-MOXA ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $8.3 | $8.30 |
| 10 | $7.47 | $74.70 |
| 100 | $6.64 | $664.00 |
| 500 | $5.81 | $2,905.00 |
| 1,000 | $5.15 | $5,150.00 |
PI7C9X7954BFDE-MOXA 개요
A UART bridge is a type of serial interface controller that sits in the broader hierarchy of interface ICs: UART -> serial controller -> I/O bridge IC -> PCI Express peripheral device. Its role in a system is to translate the high-speed, packet-based PCIe bus into multiple legacy asynchronous serial ports, allowing modern PCIe-only host platforms to drive RS-232, RS-422, and RS-485 links that would otherwise require PCI or cardbus legacy slots.
Key features include four independent UART channels that are fully software compatible with 16C550-type device drivers, meaning standard operating-system serial drivers work without vendor-specific code. The device supports configurable RS-232, RS-422, and RS-485 operating modes, an EEPROM interface for storing configuration data, and hardware pin straps that pre-program selected registers to simplify system initialization. The PCIe x1 upstream link targets high-performance, reduced-footprint designs.
From an architecture standpoint, the PI7C9X7954 buffers and arbitrates serial traffic across its four channels, with each UART providing transmit and receive FIFOs in the 16C550 tradition to reduce CPU interrupt overhead. Register-level compatibility means BIOS, Windows, Linux, and embedded RTOS serial stacks enumerate the device as a standard multi-port serial controller.
Typical applications include remote access servers, factory automation and process control equipment, instrumentation, POS terminals, ATMs, and multi-port RS-232 cards - precisely the markets MOXA serves with serial device servers and multi-port communication boards.
Design consideration: verify serial signaling levels externally - the bridge provides logic-level UART signals, so RS-232 transceivers or RS-485 drivers must be added per port; budget them into the BOM and layout.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: PI7C9X7954BFDE-MOXA — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PI7C9X7954BFDE-MOXA (동일 폼 팩터 및 풋프린트) — 차이점: UART Compatibility.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
PI7C9X7954BFDE
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →PI7C9X7954BFDE-MOXAX
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
PI7C9X7954BNDDE
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
PI7C9X7954BFDE-MOXA 최대 정격 & 전기적 특성
| 기능 | PCI Express to Quad UART I/O Bridge |
| Number of UART Channels | 4 |
| 인터페이스 | PCI Express x1 |
| UART Compatibility | 16C550-type (software compatible) |
| Serial Mode Configuration | RS-232, RS-422, RS-485 |
| Configuration Interface | EEPROM interface plus hardware pin straps |
| 패키지 | 128-LQFP (14x14 mm) |
| 실장 유형 | Surface Mount |
| RoHS / Lead Status | Lead (Pb)-free |
| Customer Suffix | MOXA (customer-specific build for MOXA) |
| Driver Support | Standard 16C550-type device drivers |
| Typical Applications | Remote access servers, automation, process control, instrumentation, POS, ATM, multi-port RS-232 |
PI7C9X7954BFDE-MOXA 128-lqfp (14x14 mm) 핀 구성 가이드
PI7C9X7954BFDE-MOXA(128-lqfp (14x14 mm) 패키지)의 핀 구성입니다. 이 전력 소자는 게이트, 드레인, 소스 단자를 갖추고 있습니다. 비편향 패키지의 경우 정확한 핀 1 방향과 풋프린트 세부 정보는 제조사 데이터시트를 참조하십시오. 일반적인 응용 분야로는 전원 공급 장치 설계, 모터 구동, 부하 스위칭이 있습니다.
다음에 대한 상세 핀아웃 데이터 없음: PI7C9X7954BFDE-MOXA.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
PI7C9X7954BFDE-MOXA 적합 용도: 6 애플리케이션s: Multi-Port RS-232 Serial Cards, Remote Access Servers, Factory Automation and Process Control, Instrumentation and Test Equipment, POS Terminals and ATM Machines, Serial Console and Device Servers (MOXA-style).
Multi-Port RS-232 Serial Cards
The PI7C9X7954BFDE-MOXA is purpose-built for multi-port RS-232 add-in cards on PCIe-only hosts. Its four 16C550 software-compatible UART channels let a single low-cost bridge replace a PCIe switch plus discrete UARTs, while FIFO buffering on each channel reduces host interrupt load during sustained full-duplex traffic. External RS-232 transceivers per port generate the standard +/-12 V-class line levels from the logic-level UART signals. The EEPROM interface stores card identity (vendor/subsystem IDs) and per-port defaults so the card enumerates cleanly under standard 16C550 drivers in Windows and Linux, which is why MOXA-class serial vendors adopt this family.
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Remote Access Servers
Remote access servers concentrate dozens of modem or console serial links behind one host. The PI7C9X7954 contributes a PCIe x1 upstream link feeding four independently buffered UART channels; multiple bridges can be cascaded behind a PCIe switch to scale port count. According to the Diodes datasheet, the device was specifically designed for high-performance remote access server requirements, and 16C550 driver compatibility keeps host software identical across bridge generations. Designers should budget FIFO threshold tuning and interrupt coalescing at the driver level so high port counts do not saturate host CPU under simultaneous connect traffic.
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Factory Automation and Process Control
Industrial automation equipment still talks Modbus RTU and proprietary protocols over RS-485 and RS-422. The PI7C9X7954BFDE-MOXA is configurable per the Diodes product page for RS-232, RS-422, and RS-485 modes, so one bridge design covers mixed-fieldbus cards. Each UART drives an external RS-485 transceiver with direction control handled by the driver or hardware flow pins. Hardware pin straps pre-program registers to simplify initialization in headless controllers with no BIOS serial setup, and the wide industrial adoption of the family eases long-term sourcing for control cabinets with 10-20 year service lives.
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Instrumentation and Test Equipment
Bench instruments, data loggers, and SCADA front-ends frequently expose legacy serial ports for SCPI commands and sensor integration. The PI7C9X7954 gives instrument designers a PCIe-native bridge whose 16C550 register model is understood by every OS and embedded stack, avoiding custom driver maintenance across Windows and Linux major releases. The 128-LQFP (14x14 mm) package suits 2U and 3U rack formats, and the EEPROM interface lets each instrument variant carry its own identity in firmware-controlled configuration. Low per-channel overhead keeps CPU load negligible at typical instrument baud rates of 9.6k to 115.2k.
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POS Terminals and ATM Machines
The Diodes datasheet explicitly lists POS and ATM among target applications. Retail and banking platforms retain serial peripherals - receipt printers, PIN pads, cash drawers, encrypted PIN entry devices - while host mainboards have moved to PCIe-only chipsets. The PI7C9X7954BFDE-MOXA bridges that gap: four 16C550-compatible channels preserve legacy peripheral drivers unchanged, the PCIe x1 link consumes minimal slot resources, and lead (Pb)-free construction meets retail hardware environmental requirements. Hardware strap initialization helps EMC-hardened, tamper-resistant enclosures where field firmware configuration is undesirable.
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Serial Console and Device Servers (MOXA-style)
Serial device servers network-enable legacy equipment by terminating RS-232/422/485 links and tunneling them over Ethernet. This -MOXA customer build originates exactly from that market: MOXA serial hardware uses this bridge to convert a PCIe host interface into four managed UART channels. The 16C550 software compatibility means the same server firmware image supports cards built on any PI7C9X795x channel count, simplifying product line maintenance. Designers pair each UART with an isolated RS-485 transceiver for the surge-prone field side, and use the EEPROM to store MAC-adjacent asset data and port mode straps.
추천
추천 제품 요약
엔지니어링 참조 데이터: PI7C9X7954BFDE-MOXA — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | PI7C9X7954BFDE | PI7C9X7954BFDE-MOXAX | PI7C9X7954BNDDE |
|---|---|---|---|---|
| Package | 128-LQFP (14x14 mm) | 128-LQFP (14x14 mm) - same | 128-LQFP (14x14 mm) - same | 128-LQFP (14x14 mm) - same |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| UART Channels | 4 | 4 | 4 | 4 |
| Host Interface | PCI Express x1 | PCI Express x1 | PCI Express x1 | PCI Express x1 |
| 16C550 Driver Compatibility | Yes | Yes | Yes | Yes |
| Serial Modes | RS-232 / RS-422 / RS-485 | RS-232 / RS-422 / RS-485 | RS-232 / RS-422 / RS-485 | RS-232 / RS-422 / RS-485 |
| EEPROM Interface | Yes | Yes | Yes | Yes |
주요 차별점
- MOXA customer-build provenance for serial device server production (vs PI7C9X7954BFDE (catalog))
- Single-chip integration vs discrete UART solutions (vs PCIe switch + discrete 16C550 UARTs)
- Trade-off: fixed four-channel count (vs PI7C9X7952 / PI7C9X7958)
설계 노트
Route the PCIe x1 differential pairs (PETp/PETn, PERp/PERn) as 100-ohm controlled-impedance, length-matched within 5 mils, with AC coupling capacitors placed near the bridge side per PCIe CEM convention. Keep the pairs away from UART switching edges and clock lines; the 128-LQFP 0.5 mm pitch limits breakout routing, so fan out differential pairs first on inner layers with solid reference planes beneath.
The PI7C9X7954 outputs logic-level UART signals only - it does not generate RS-232 voltage levels. Each of the four channels requires an external RS-232 transceiver (e.g., MAX3232 class) or RS-422/485 driver, with charge-pump capacitors placed close to the transceiver. Forgetting this is the most common first-revision failure on multi-serial cards built around this bridge family.
Use the EEPROM interface with a small I2C-compatible EEPROM near the device, with proper pull-ups on the clock and data lines, to store vendor/subsystem IDs and per-port defaults; alternatively use hardware pin straps for static configuration per the datasheet initialization section. Decouple each supply pin with 0.1 uF ceramics plus bulk capacitance at the LQFP corners, following the typical application circuit in the manufacturer datasheet.
Estimated: the bridge core plus PCIe PHY draw is modest (typically well under 1 W for PCIe x1 bridge-class devices), but confirm the exact supply pin voltage(s) and current from the datasheet electrical characteristics table - these values were not available in the verified web data for this page and must be checked before finalizing the power budget.
규정 준수 정보
Manufacturer product page states the PI7C9X7954 is designed to meet lead (Pb)-free requirements. Detailed RoHS/REACH declarations were not present in the verified web data and must be confirmed from the Diodes compliance portal.
