PI7C9X7954BFDEX - PCIe x1 to 4-Port UART Bridge | Diodes Inc.
N.º da peça: PI7C9X7954BFDEX ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.26 | $8,26 |
| 10 | $7.6 | $76,00 |
| 100 | $6.9 | $690,00 |
| 500 | $6.2 | $3.100,00 |
| 1.000 | $5.6 | $5.600,00 |
PI7C9X7954BFDEX Visão geral
A UART (universal asynchronous receiver-transmitter) is a serial interface block that converts parallel bus data into asynchronous serial data frames. In the interface-IC hierarchy, this device belongs to the bridge-controller class: PCIe on the host side, UART on the device side. Bridges like the PI7C9X7954BFDEX are the standard way to preserve RS-232/RS-485 connectivity on motherboards, backplanes, and add-in cards that no longer expose legacy ISA or PCI slots.
Key features include four 16550-compatible UART channels with 64-byte transmit and receive FIFOs for reduced interrupt overhead, a PCIe x1 Gen1 (2.5 GT/s) host interface, support for cardbus/legacy COM-port register mapping, and industrial-grade temperature operation indicated by the EX suffix. Programmable baud-rate generators support standard and extended data rates, and flow-control options include RTS/CTS hardware handshaking and XON/XOFF software flow control.
Architecturally, the bridge maps each UART's register set into PCI/PCIe memory or I/O space, presenting four standard COM ports to the operating system without vendor-specific drivers on most platforms. Interrupt handling is consolidated through a single MSI or legacy INTx signal, simplifying host interrupt routing in dense multi-port designs.
Typical applications include industrial PCs and embedded controllers requiring multiple serial devices, point-of-sale terminals driving receipt printers and barcode scanners, network-equipment management consoles, and medical instrument serial links. Its LQFP-128 footprint suits both add-in cards and on-board solutions.
Design consideration: the 128-LQFP has an 0.4 mm-class pin pitch (per package outline), so verify fab capability and design the PCIe 100 MHz reference clock distribution with clean, low-jitter routing to the host clock source.
This page synthesizes distributor pricing, availability, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para PI7C9X7954BFDEX — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PI7C9X7954BFDEX (mesmo formato e footprint) — diferindo em Function, UART Compatibility.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PI7C9X7954BFDE
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
Consulte o preço
Ver ficha técnica →PI7C9X7954BFDEX-TR
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PI7C9X7954AFDEX
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PI7C9X7954BFDEX Classificações máximas e características elétricas
| Função | PCI Express x1 to 4-channel UART bridge |
| UART Channels | 4 |
| UART Compatibility | 16550-compatible with FIFO |
| Host Interface | PCI Express x1, 2.5 GT/s |
| Encapsulamento | 128-LQFP (14x14 mm) |
| Tipo de montagem | Surface Mount |
| Flow Control | RTS/CTS hardware, XON/XOFF software |
| Interrupt Signaling | MSI / legacy INTx |
| Category (DigiKey) | Integrated Circuits (ICs) - Interface - Controllers |
Guia de Configuração de Pinos do PI7C9X7954BFDEX 128-lqfp (14x14 mm)
Configuração de pinos para PI7C9X7954BFDEX (pacote 128-lqfp (14x14 mm)). Este dispositivo de potência possui terminais de gate, drain e source. Para pacotes não polarizados, consulte o datasheet do fabricante para a orientação exata do pino 1 e detalhes do footprint. Aplicações comuns incluem projeto de fontes de alimentação, acionamento de motores e comutação de cargas.
Nenhum dado detalhado de pinagem disponível para PI7C9X7954BFDEX.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
PI7C9X7954BFDEX é adequado para 6 aplicaçãos: Industrial PC Serial Expansion, Point-of-Sale Terminals, Network Equipment Management Consoles, Medical Instrument Serial Interfaces, Server and Storage Appliance Diagnostics, Building Automation and Security Gateways.
Industrial PC Serial Expansion
Industrial PCs and embedded controllers still drive PLCs, CNC machines, and legacy field instruments over RS-232/RS-485 serial links, yet modern PCIe chipsets have eliminated legacy COM headers. The PI7C9X7954BFDEX fits this application because a single PCIe x1 Gen1 lane (2.5 GT/s) far exceeds the aggregate bandwidth of four UART channels, and its 16550-compatible cores with FIFO buffering reduce interrupt load in multi-device polling environments. Mounted directly on an industrial backplane or add-in card in the 128-LQFP 14x14 mm footprint, each channel pairs with an RS-485 transceiver such as an SN65HVD series part downstream. Because the EX-suffix part is graded for extended temperature, it tolerates cabinet environments without active cooling, a quantified reliability benefit over commercial-grade bridges.
Recomendado
Point-of-Sale Terminals
POS terminals simultaneously connect receipt printers, barcode scanners, cash drawers, and card readers - most of which communicate over RS-232 serial. The PI7C9X7954BFDEX consolidates four such peripherals behind one PCIe x1 host interface, replacing multiple USB-serial dongles and reducing cabling complexity. Its four independent 16550-compatible UARTs with FIFO buffering maintain data integrity when a thermal printer and a scanner burst data concurrently, while RTS/CTS hardware flow control matches the handshake conventions of embedded printer engines. The integrated bridge presents standard COM ports, so existing POS application software runs unchanged - a key cost benefit since POS software stacks are rarely re-certified. The 128-LQFP surface-mount package supports compact, fanless terminal motherboards where mechanical space is at a premium.
Recomendado
Network Equipment Management Consoles
Switches, routers, and base-station equipment rely on serial console ports for out-of-band management. The PI7C9X7954BFDEX lets a single PCIe-based management CPU drive four console UARTs - one per line card or managed device - inside the same chassis. Its PCIe x1 link provides ample bandwidth because console traffic rarely exceeds kilobaud rates, leaving link capacity essentially unconstrained, while the FIFO-buffered 16550 cores tolerate bursty log dumps without dropped characters. Consolidated MSI interrupt signaling reduces CPU overhead compared with discrete UART chips sharing a legacy interrupt line. The extended-temperature EX grade suits outdoor telecom cabinets. Typical implementations pair each UART TX/RX with an RS-232 level shifter wired to an RJ45 console jack, the de-facto standard in networking hardware.
Recomendado
Medical Instrument Serial Interfaces
Patient monitors, infusion pumps, and laboratory analyzers frequently export data over asynchronous serial links to hospital information systems, and regulatory re-certification favors keeping the serial data path unchanged while modernizing the host compute platform. The PI7C9X7954BFDEX enables exactly this migration: the UART-facing register interface remains 16550-compatible so legacy firmware drivers operate identically, while only the host-facing side upgrades from PCI to PCIe x1. The extended-temperature grade supports demanding clinical environments, and the 128-LQFP (14x14 mm) package reflows on standard medical-grade PCB assemblies. FIFO buffering prevents character loss during high-rate waveform data transfers from analog front ends, an important consideration when each lost sample could affect monitoring accuracy.
Recomendado
Server and Storage Appliance Diagnostics
Storage appliances and rack servers integrate multiple onboard serial links for BIOS redirection, BMC connections, and drive-backplane diagnostics. The PI7C9X7954BFDEX provides four such UARTs from one PCIe x1 slot of a management controller, with the PCIe link bandwidth massively exceeding the aggregate serial data rate even at maximum UART speeds. Its FIFO-buffered channels absorb burst console output during boot logs or error dumps without host CPU intervention, and MSI-based interrupt aggregation simplifies routing in dense server boards where legacy interrupt lines are scarce. The extended-temperature EX grade also fits edge and micro-datacenter enclosures operating in unconditioned environments. Pair each UART with an RS-232 transceiver for external service ports or run TTL-level links to onboard BMCs.
Recomendado
Building Automation and Security Gateways
Access-control panels, CCTV DVRs, and building-automation gateways communicate with door controllers, card readers, and alarm panels over multidrop RS-485 and point-to-point RS-232 buses. The PI7C9X7954BFDEX gives these gateways four independent UART channels behind a single PCIe x1 interface, allowing one IP-connected gateway CPU to serve multiple serial bus segments concurrently. Its 16550-compatible cores support the Modbus RTU frame timing behavior common in building protocols, and FIFO buffering maintains frame integrity under multi-master bus arbitration retries. The extended temperature grade covers rooftop and mechanical-room equipment enclosures from -40C-class ambient conditions, and the 128-LQFP surface-mount package enables compact gateway PCBs. Each channel typically connects to an isolated RS-485 transceiver for galvanic robustness across long cable runs.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PI7C9X7954BFDEX — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PI7C9X7954BFDE | PI7C9X7954BFDEX-TR | PI7C9X7954AFDEX |
|---|---|---|---|---|
| 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 | PCIe x1, 2.5 GT/s | PCIe x1, 2.5 GT/s | PCIe x1, 2.5 GT/s | PCIe x1, 2.5 GT/s |
| UART Compatibility | 16550-compatible | 16550-compatible | 16550-compatible | 16550-compatible |
| Temperature Grade | Extended (EX suffix) | Commercial grade | Extended (EX suffix) | Extended (EX suffix) |
| Lifecycle Status | Active | Active | Active | Active |
Principais diferenciais
- Four UART channels from one PCIe lane (vs PI7C9X7952 (2-port family member))
- Extended temperature grade in the same die (vs PI7C9X7954BFDE)
- Standard COM-port enumeration (vs Discrete UART + PCIe-switch solutions)
Notas de projeto
Route the 100 MHz PCIe reference clock (REFCLK) as a 100-ohm differential pair with length matching within +/-5 mil between the host clock source and the PI7C9X7954BFDEX REFCLK pins, per PCIe CEM/base layout practice. Keep the pair away from UART switching lines and use series damping resistors if the clock source is shared. Poor clock integrity directly raises bit-error rate on the 2.5 GT/s link and can prevent link training at power-up.
Place 100 nF ceramic decoupling capacitors at each supply pin of the 128-LQFP package, with at least one bulk 10 uF capacitor per supply domain close to the IC. Estimated: a quad-UART bridge at PCIe Gen1 power levels typically dissipates well under 1 W, so thermal design is usually dominated by downstream RS-232 transceivers rather than this bridge itself; still, verify actual dissipation from the datasheet power figures at your worst-case baud rates.
Verify the temperature-grade suffix before releasing the BOM: PI7C9X7954BFDE (commercial) and PI7C9X7954BFDEX (extended) are the same die but are NOT interchangeable in industrial qualification. Also confirm the datasheet-specified UART maximum baud rate against your peripherals - POS printers and modems occasionally require extended rates beyond the standard 115.2 kbps set, which may depend on the input clock frequency chosen.
Informações de conformidade
Compliance status not stated in the retrieved distributor snippets. Modern Diodes Incorporated interface ICs are typically RoHS-compliant, but this must be confirmed from the official product page or datasheet before use in regulated products.
