PI7C9X754FFE - Quad UART with 64-Byte FIFO | Diodes Incorporated
MPN： PI7C9X754FFE ✓ 啟用中PI7C9X754FFE 概覽
A UART, or universal asynchronous receiver/transmitter, is a serial interface controller that converts parallel data into framed serial signals and receives framed serial data in parallel form. Within the broader semiconductor hierarchy, a quad UART belongs to the interface IC family, which sits under integrated circuits and supports communication between processors, transceivers, sensors, and peripheral equipment. Four integrated channels can reduce component count and simplify firmware resource allocation compared with separate single-channel UART devices.
The PI7C9X754FFE's defining verified features are its four UART channels, 64-byte FIFO buffer, RS485 controller capability, IrDA 1.1 support, and 80-LQFP surface-mount package. The FIFO helps decouple received-byte processing from the serial receiver, reducing the amount of immediate data-handling required by the host processor. This is particularly useful where several ports receive bursts of data or where deterministic interrupt servicing is important.
The 80-pin LQFP provides the physical lead count needed for four full-featured UART channels. Pin assignment, logic levels, electrical limits, clock requirements, flow-control features, and exact supported data rates were not included in the verified source snippets and must be confirmed in the manufacturer datasheet before schematic capture or PCB routing.
Typical uses include industrial serial concentrators, multi-port instrumentation, embedded control equipment, RS485-connected sensor nodes, and IrDA-capable short-range infrared links. The device is also appropriate for test and measurement systems that expose several asynchronous serial ports through a common controller.
Designers should verify pin multiplexing, interrupt topology, peripheral clock requirements, and FIFO behavior in the datasheet before finalizing the PCB. Logic-level compatibility, RS485 transceiver selection, line termination, and isolation must also be confirmed against the external circuitry rather than assumed from the UART controller specification.
This page consolidates verified distributor product information, package and feature details, purchasing data, application guidance, and substitution constraints. Because the supplied evidence does not identify a verified pin-to-pin replacement, the alternatives section does not present unverified same-package parts as drop-in options.
直接替換替代品，適用於 PI7C9X754FFE — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品PI7C9X754FFE 最大額定值與電氣特性
| Device Type | Quad UART interface IC |
| Number of UART Channels | 4 channels |
| FIFO Buffer | 64 bytes |
| RS485 Controller Support | Supported |
| Infrared Support | IrDA 1.1 |
| 封裝 | 80-pin LQFP |
| Package Body Size | 12 mm x 12 mm |
| 安裝類型 | Surface mount |
PI7C9X754FFE 12 mm x 12 mm 腳位配置指南
PI7C9X754FFE（12 mm x 12 mm 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： PI7C9X754FFE.
請參閱 資料表 以查看完整腳位配置。
典型應用
PI7C9X754FFE 適用於 6 應用s: Industrial Serial Concentrator, RS485 Sensor Gateway, IrDA Short-Range Infrared Link, Embedded Instrument Interface, Test and Measurement Front Panel, Multiport Communications Controller.
Industrial Serial Concentrator
The PI7C9X754FFE fits an industrial serial concentrator because it consolidates 4 UART channels and a 64-byte FIFO into one 80-LQFP device. A host processor can route four external instruments or controllers through a common interface rather than requiring four separate UART packages. The FIFO can batch incoming bytes and reduce interrupt servicing overhead during short data bursts. The designer must still add the appropriate external RS485 transceivers, isolation, surge protection, and wiring protection, and must confirm the device's operating temperature and electrical limits in the manufacturer datasheet.
推薦
RS485 Sensor Gateway
For an RS485 sensor gateway, the PI7C9X754FFE provides 4 UART channels with a 64-byte FIFO while its verified RS485 controller capability supports UART-side control functions. The gateway can connect multiple sensing or actuator nodes and transfer their data through a host processor. The controller does not replace an RS485 line transceiver, so the design still needs polarity handling, driver enable control, cable termination where required, galvanic isolation if specified, and surge protection appropriate to the installation environment.
推薦
IrDA Short-Range Infrared Link
The PI7C9X754FFE is appropriate for an IrDA 1.1 short-range infrared endpoint when verified IrDA support is confirmed against the required operating mode and data rate. Its 4 UART channels permit an embedded controller to manage an infrared link alongside other asynchronous ports, while the 64-byte FIFO helps buffer received traffic. An external IrDA-compatible optical transceiver is still required because a UART controller does not directly provide infrared light emission or reception. Firmware must also implement the framing and timing behavior required by the selected optical link.
推薦
Embedded Instrument Interface
The PI7C9X754FFE can serve as the multi-port serial interface in an embedded instrument that must communicate with sensors, actuators, or service equipment. Four UART channels reduce the number of separate communication controllers, and the documented 64-byte FIFO helps separate serial reception from the processor's measurement workload. The 80-LQFP, 12 mm by 12 mm package requires adequate board area and careful pin escape routing. Logic thresholds, peripheral clocking, interrupt mapping, and any flow-control signals must be verified directly from the manufacturer datasheet before layout release.
推薦
Test and Measurement Front Panel
The PI7C9X754FFE is suitable for a test-and-measurement front panel requiring several asynchronous connections to instruments, computers, or service interfaces. Four UART channels can support multiple communication paths, and the 64-byte FIFO allows received data to be accumulated before the controller processes it. This can be valuable when several ports generate short command responses around the same time. Board-level isolation and grounding must be designed for the signals present, while maximum baud rate, electrical levels, and peripheral timing remain items to confirm in the manufacturer documentation.
推薦
Multiport Communications Controller
The PI7C9X754FFE fits a communications controller that must consolidate four asynchronous ports while preserving orderly data handling. Its 64-byte FIFO can reduce the frequency at which the host must service every received character, making the arrangement practical for moderate-volume command and telemetry traffic. The package's 80 leads provide access to four complete UART channels, but the large footprint can make routing more difficult than with a compact quad-UART package. Engineers should verify pin multiplexing, interrupt sharing, peripheral clock requirements, and reset behavior in the manufacturer datasheet.
推薦
推薦產品摘要
工程參考資料，適用於 PI7C9X754FFE — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Device Type | Quad UART interface IC |
| Brand | Diodes Incorporated |
| Package | 80-pin LQFP, 12 mm x 12 mm |
| Number of UART Channels | 4 channels |
| FIFO Buffer | 64 bytes |
| RS485 Controller Support | Supported |
| — | IrDA 1.1 |
| Starting Listed Price | $11.8754 as of 2026-10-29 |
主要差異化特點
- Four UART channels in one interface IC (對比A single-channel UART device)
- Integrated data buffering (對比A UART implementation without the documented FIFO)
- Multiple serial-control functions (對比A basic UART-only interface IC)
設計說明
Reserve the full 80-LQFP footprint on a 12 mm by 12 mm land pattern and verify it against the manufacturer package drawing before PCB release. The 80-lead package requires substantially more routing space than a compact quad-UART package. Place decoupling capacitors close to the supply and ground pins, keep serial outputs away from sensitive analog or clock nets, and provide adequate escape routing for every peripheral signal.
Confirm the operating supply range, absolute maximum ratings, input thresholds, output levels, and peripheral clock requirements from the manufacturer datasheet before connecting external logic. The supplied evidence does not include those electrical limits, so no voltage or capacitor value should be assumed. Use a supply rail with appropriate noise and stability margin, and size local bypass capacitance according to the manufacturer's recommendations rather than generic guidance.
Do not treat UART controller support as a complete RS485 physical layer. The PI7C9X754FFE still requires the correct external RS485 transceiver, and long cables may need termination, controlled grounding, isolation, and surge protection. Likewise, IrDA 1.1 operation requires a compatible optical transceiver. Confirm the exact driver-enable, interrupt, modem-control, and flow-control pin functions before assigning board signals.
合規資訊
The verified web snippets did not state compliance status. Obtain the current manufacturer datasheet and applicable material or environmental declaration before production release.
