PI7C9X794FCE - Quad UART with 64-Byte FIFO | Diodes Incorporated
MPN: PI7C9X794FCE ✓ نشطPI7C9X794FCE نظرة عامة
A UART, or universal asynchronous receiver/transmitter, is a serial communication controller that converts parallel data into framed serial signals and reconstructs received data. The PI7C9X794FCE belongs to the UART interface IC and RS485 controller hierarchy within the broader interface IC and semiconductor categories. Its four channels can reduce the number of external serial controllers required in embedded, industrial, networking, and data-acquisition equipment.
Key features include four UART channels, a 64-byte FIFO, an RS485 controller, IrDA 1.1 support, and a 1.62 V to 3.6 V operating-voltage range. The 64-byte FIFO supports buffering between the host interface and serial transmitter or receiver, helping accommodate bursts of incoming or outgoing data without requiring an external FIFO memory. Its 64-LQFP package provides a conventional surface-mount integration option for compact controller boards.
The part is presented by DigiKey as an RS485 controller, IrDA 1.1, UART interface with a 64-LQFP package, while Mouser describes it as a quad UART with a 64-byte FIFO. These descriptions place it between a general-purpose multi-channel UART and a dedicated serial transceiver: the on-chip interface manages channel and FIFO functions, while an external line driver or receiver may still be required for physical RS485 or IrDA links.
Typical uses include industrial serial concentrators, programmable logic controllers, embedded data loggers, infrared data-transfer equipment, and multiport service interfaces. The four-channel architecture is especially useful where a central processor must exchange data with several peripherals while avoiding one separate UART controller per port. System designers should still verify signal levels, transceiver requirements, timing, and pin-level functions against the manufacturer documentation before layout release.
For reliable implementation, place the controller close to its supported peripherals, provide the decoupling and clock circuitry required by the datasheet, and keep long external transmission lines away from sensitive digital nodes. The operating range of 1.62 V to 3.6 V allows integration with 1.8 V and 3.3 V systems, but input levels, output levels, and attached transceivers must remain electrically compatible. Availability, detailed pin assignments, throughput, and electrical limits not shown in the supplied verified results should be checked against the current manufacturer datasheet.
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اطلب بدائلPI7C9X794FCE الحدود القصوى والخصائص الكهربائية
| Device Type | Quad UART interface controller |
| Number of UART Channels | 4 channels |
| Operating Voltage Range | 1.62 V to 3.6 V |
| FIFO Capacity | 64 bytes per stated interface description |
| RS485 Controller Support | Supported |
| IrDa Version | IrDA 1.1 |
| Package Type | 64-LQFP |
| Package Dimensions | 10 mm x 10 mm |
| نوع التركيب | Surface mount |
| Supply Voltage Tolerance | 1.62 V to 3.6 V |
دليل تكوين أطراف PI7C9X794FCE 10 mm x 10 mm
تكوين الأطراف لـ PI7C9X794FCE (حزمة 10 mm x 10 mm). يتميز جهاز الطاقة هذا بأطراف البوابة والمصرف والمصدر. بالنسبة للحزم غير المستقطبة، راجع ورقة بيانات الشركة المصنعة لمعرفة الاتجاه الدقيق للطرف 1 وتفاصيل البصمة. تشمل التطبيقات الشائعة تصميم مصادر الطاقة وتشغيل المحركات وتبديل الأحمال.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ PI7C9X794FCE.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
PI7C9X794FCE مناسب لـ 6 التطبيقs: Industrial RS485 Serial Concentrator, Infrared Data Transfer Equipment, Programmable Logic Controller, Embedded Data Logger, Multiport Service Interface, Embedded Test and Measurement System.
Industrial RS485 Serial Concentrator
The PI7C9X794FCE fits an industrial serial concentrator because it combines four UART channels, RS485 controller functionality, a 64-byte FIFO, and a 1.62 V to 3.6 V operating range. The host processor can connect several multidrop field buses through one controller rather than allocating a separate UART block for every port. The FIFO can buffer burst traffic between host transactions and serial activity, reducing the frequency at which firmware must service the interface. Its 64-LQFP footprint also simplifies consolidation onto a relatively dense controller board. The exact RS485 mode, termination strategy, and transceiver requirements must still be confirmed from the manufacturer documentation.
موصى به
Infrared Data Transfer Equipment
PI7C9X794FCE is applicable to IrDA 1.1 data-transfer equipment because DigiKey explicitly identifies IrDA 1.1 support alongside the UART interface function. An IrDA-compatible serial controller can organize transmit and receive data according to infrared framing requirements while using the stated 64-byte FIFO to hold bursts between host and peripheral processing. The four-channel architecture may also support a product containing more than one optical data path. Designers still need to confirm the exact IrDA signaling method, optical-drive architecture, receive timing, and whether external infrared transceiver circuitry is required.
موصى به
Programmable Logic Controller
The PI7C9X794FCE can suit a programmable logic controller or compact industrial controller that must communicate with several serial devices. Four UART channels reduce the number of dedicated serial peripherals required for programming consoles, local operator panels, sensors, and service interfaces. The 64-byte FIFO provides a buffer for short bursts, while operation from 1.62 V to 3.6 V supports compatibility with modern low-voltage controller logic. The main engineering checks are the device's interrupt architecture, clock requirements, electrical thresholds, and whether the PLC software driver already supports the controller.
موصى به
Embedded Data Logger
PI7C9X794FCE fits an embedded data logger that gathers information from several instruments or sensors. Four UART channels allow separate devices to share a common processor, and the 64-byte FIFO can absorb short incoming bursts before the application code moves data into nonvolatile storage. The 1.62 V to 3.6 V supply range is useful for systems built around 1.8 V or 3.3 V processors. In a logger, designers should size the software buffer for sustained throughput rather than assuming the hardware FIFO alone can handle continuous high-rate transfers, and should verify the maximum supported baud rate against the required sensor traffic.
موصى به
Multiport Service Interface
The PI7C9X794FCE is appropriate for a multiport service interface in networking, telecom, or maintenance equipment that must expose several serial connections through one controller. Four UART channels reduce connector count and simplify host-controller resources, while the 64-LQFP package consolidates the interface logic on a surface-mount board. The buffered data path can smooth short service-command exchanges. For deployed equipment, the system should include appropriate protection between external connectors and the controller because the supplied data does not establish the PI7C9X794FCE's complete ESD, isolation, or surge withstand ratings.
موصى به
Embedded Test and Measurement System
PI7C9X794FCE can support a compact test and measurement instrument that communicates with several external fixtures or instrument controllers. Four UART channels permit simultaneous connections to modules, calibration equipment, or service ports, while the stated 64-byte FIFO helps decouple short exchanges from the host's acquisition cycle. The 1.62 V to 3.6 V operating range supports low-voltage mixed-signal systems. Engineers should verify baud-rate limits, timing margins, electrical levels, and interrupt latency, then validate that the available FIFO depth remains adequate for the expected command and response sizes.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PI7C9X794FCE — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| Brand | Diodes Incorporated |
| Package | 64-LQFP (10 mm x 10 mm) |
| Device Type | Quad UART interface controller |
| UART Channels | 4 channels |
| Operating Voltage Range | 1.62 V to 3.6 V |
| FIFO Capacity | 64 bytes |
| RS485 Controller | Supported |
| IrDa Version | IrDA 1.1 |
| Verified Starting Price | $31.34 USD as of 2026-10-29 |
أبرز الفروقات
- Four-channel serial integration (مقابلSingle-channel UART interface devices)
- RS485 controller and IrDA 1.1 functionality (مقابلGeneral-purpose UART controllers)
- Buffered serial data handling (مقابلUART controllers without a stated FIFO)
- Low-voltage system integration (مقابلLegacy 5 V serial controllers)
ملاحظات التصميم
The PI7C9X794FCE operates from 1.62 V to 3.6 V. Place the required local bypass capacitors at the device power pins according to the manufacturer layout guidance, and keep the 3.3 V rail within its stated range. Because the supplied data does not identify the total supply current, input thresholds, or power-pin configuration, do not select capacitors or estimate current consumption from this page; confirm those details in the datasheet before power budgeting.
Use the manufacturer-provided 64-LQFP land pattern and verify pin 1 orientation before placing the part. A 64-LQFP has closely spaced leads, so inspect the PCB for solder bridging and confirm assembly capability before production. Keep the UART routes away from clocks and switching-converter power nodes, and provide a continuous ground reference beneath the device to reduce return-path discontinuity.
Treat RS485 and IrDA as external physical interfaces rather than direct board-level UART connections. The verified listings describe controller functions but do not establish whether full line drivers and receivers are integrated. Select and place any required external transceivers according to the recommended application circuit, isolate long cable paths as required, and validate signal levels, timing, grounding, and termination on the assembled prototype.
Do not treat the 64-byte FIFO as permission for unlimited high-rate serial traffic. Confirm the maximum UART rate, per-channel FIFO interpretation, interrupt behavior, and overrun handling in the manufacturer documentation. Software must also avoid assuming that four channels have identical physical-level requirements; an RS485 port, an IrDA port, and any other serial port may require different external circuitry.
معلومات الامتثال
No verified RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were included in the supplied sources. AEC-Q100 is not applicable because this is a general-purpose interface IC, not an automotive-qualified variant identified by the source data.
