PI7C1401AZFEX I2C/SPI Quad Port Expander | Diodes Incorporated
N.º de pieza: PI7C1401AZFEX ✗ Fin de vidaPI7C1401AZFEX Descripción general
The PI7C1401AZFEX operates from a 1.8 V to 3.3 V supply and is packaged in a 56-pin TQFN measuring 11 mm by 5 mm. Its dual-serial-host architecture allows a system controller to reach several peripheral or module ports through one low-speed management link. Rather than assigning a separate controller interface to every port, the PI7C1401 centralizes port-management traffic and reports module or port events through a dedicated host interrupt.
Four downstream I2C interfaces are the principal expansion function of the device. These interfaces suit modules that expose management registers, status indicators, or configuration controls through I2C. The upstream SPI or I2C connection supports integration with network processors, field-programmable gate arrays, embedded controllers, and other digital systems. General-purpose control pins add flexibility for slower module-management signals and reduce the need for additional discrete interface components.
The PI7C1401 is specifically intended for common networking-port form factors, including SFP+ and QSFP+ equipment. It can be used in optical transceiver cages, switch and router line cards, telecommunications equipment, and industrial control systems that need scalable port management. Its four-port structure is especially useful where a host must monitor or configure multiple pluggable modules while retaining a compact board footprint.
Designers should use the manufacturer pin-description table and recommended application schematic when assigning signals. The 1.8 V to 3.3 V supply requirement must be reconciled with the voltage levels used by the host and downstream modules. Decoupling, exposed-pad connection, ground-plane continuity, and signal-routing guidance should follow the manufacturer layout recommendations. Interrupt behavior and the electrical characteristics of the I2C and SPI interfaces should also be checked against the system timing budget.
This page organizes the PI7C1401AZFEX function, supply range, package, port-expansion architecture, application fit, and procurement information. It also identifies the technical fields that require confirmation from the manufacturer datasheet, helping engineers evaluate the device without confusing general port-expander functionality with package-specific or timing-specific guarantees.
Alternativas directas para PI7C1401AZFEX — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
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Solicitar alternativasPI7C1401AZFEX Valores máximos y características eléctricas
| Device Type | I2C-bus/SPI to quad port expander |
| Supply Voltage Range | 1.8 V to 3.3 V |
| Upstream Serial Interface | I2C-bus or SPI |
| Downstream Port Interfaces | 4 I2C interfaces |
| Host Notification | 1 interrupt output |
| General-Purpose Control Pins | Available for low-speed module control signals |
| Target Port Types | SFP+ and QSFP+ |
| Package Type | 56-pin TQFN |
| Package Dimensions | 11 mm x 5 mm |
| Tipo de montaje | Surface mount |
| Logic Voltage | 1.8 V to 3.3 V |
| I2C Interface | 4 downstream interfaces |
| SPI Interface | Upstream host interface |
| Interrupt Function | Reports port or module events to the host |
Guía de configuración de pines de PI7C1401AZFEX 11 mm x 5 mm
Configuración de pines para PI7C1401AZFEX (encapsulado 11 mm x 5 mm). Este dispositivo de potencia presenta terminales de puerta, drenador y fuente. Para encapsulados no polarizados, consulte la hoja de datos del fabricante para conocer la orientación exacta del pin 1 y los detalles del footprint. Las aplicaciones habituales incluyen el diseño de fuentes de alimentación, el accionamiento de motores y la conmutación de cargas.
No hay datos detallados de patillaje disponibles para PI7C1401AZFEX.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
PI7C1401AZFEX es adecuado para 6 aplicacións: SFP+ Optical Module Management, QSFP+ Multi-Port Switch Systems, Telecommunications Line Cards, Network Processor Port Management, Industrial Optical Control Panels, Test and Measurement Module Control.
SFP+ Optical Module Management
The PI7C1401AZFEX fits SFP+ cage designs that require a central host controller to supervise multiple optical modules. Its four downstream I2C interfaces can organize module-management traffic into dedicated port channels, while the upstream I2C or SPI connection connects the ports to a network processor, FPGA, or embedded controller. The interrupt output supports event-driven handling when a module reports a status change. Its 1.8 V to 3.3 V operating range suits modern low-voltage systems. Designers should assign each interface according to the manufacturer pin table, confirm address behavior for every attached module, and route the signals away from switching-converter power paths.
Recomendado
QSFP+ Multi-Port Switch Systems
The PI7C1401AZFEX is appropriate for QSFP+ line cards where one host must manage several high-density pluggable ports. Four downstream I2C interfaces reduce the number of direct host-side management connections, and the interrupt output lets the controller respond to module events without continuous polling. The upstream SPI option can suit processors with efficient serial peripherals, while I2C remains available for host topologies that prefer that bus. System planners should verify each module's management requirements, address allocation, signal-level compatibility, and the controller's timing budget before finalizing the port-management architecture.
Recomendado
Telecommunications Line Cards
The PI7C1401AZFEX can simplify management of multiple line-card modules in telecommunications equipment. Its four I2C interfaces provide separate downstream paths for module control, while an I2C or SPI upstream link connects to a supervisory controller. General-purpose pins support low-speed control functions where module interfaces are not managed entirely through I2C. The interrupt output helps the controller prioritize events, but proper design requires deterministic address assignment and verification of every downstream bus. The 1.8 V to 3.3 V range supports integration with low-voltage logic, provided all attached devices share compatible levels.
Recomendado
Network Processor Port Management
The PI7C1401AZFEX can sit between a network processor or communications controller and four externally managed ports. SPI provides a high-efficiency host-side path when the selected processor supports it, while the four I2C outputs isolate module-management traffic into identifiable channels. This arrangement is useful when the host has fewer serial-management resources than the number of optical ports it must supervise. The interrupt line provides a compact mechanism for event notification, reducing unnecessary polling. Firmware should include address mapping and fault handling for absent, faulted, or unresponsive modules, and PCB design should preserve signal integrity through careful TQFN fan-out and continuous return paths.
Recomendado
Industrial Optical Control Panels
The PI7C1401AZFEX is suitable for industrial systems that combine several optical or communication modules with a central controller. The four downstream I2C interfaces support organized management of module registers and status signals, while general-purpose control pins handle lower-speed functions. A shared I2C or SPI host connection makes the PI7C1401 suitable for space-constrained control assemblies where separate converters would increase complexity. For industrial equipment, designers should check the exact temperature grade and transient requirements, provide stable local decoupling, and implement recovery behavior for bus stalls or disconnected modules. The interrupt path must also be configured for deterministic host response.
Recomendado
Test and Measurement Module Control
The PI7C1401AZFEX can support test equipment that accesses configuration or status registers across several pluggable modules. The four I2C interfaces allow a controller to organize per-module management traffic, and the interrupt output can flag asynchronous events for faster diagnostic handling. This topology is useful in automated test systems where module identity, calibration state, and error information must be collected from multiple ports. Engineers should define a stable address scheme, account for hot-plug transients, and ensure that the host controller can recover if a module removes power during a transaction. The 1.8 V to 3.3 V range aligns with many contemporary control and acquisition systems.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PI7C1401AZFEX — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Brand | Diodes Incorporated |
| Package | 56-pin TQFN (11 mm x 5 mm) |
| Device Type | I2C-bus/SPI to quad port expander |
| Supply Voltage Range | 1.8 V to 3.3 V |
| Upstream Host Interface | I2C-bus or SPI |
| Downstream Interfaces | 4 I2C interfaces |
| Host Notification | Interrupt output |
| General-Purpose Control | Pins for low-speed control signals |
| Target Module Types | SFP+ and QSFP+ |
Diferenciadores clave
- Purpose-built multi-port expansion (frente a Generic I2C port expanders)
- Optical-module management orientation (frente a General-purpose serial expanders)
- Event-driven host notification (frente a Polling-only management architectures)
Notas de diseño
Follow the Diodes Incorporated recommended 56-TQFN land pattern and exposed-pad connection. Place the required supply bypass capacitors close to their designated power pins, provide a continuous ground reference beneath the device, and use adequate thermal-via density where the exposed pad must dissipate heat. Keep the I2C and SPI routing short and away from high-current switching nodes. Pin assignments and exact pad geometry should be taken directly from the manufacturer package drawing.
Design each downstream I2C path as a separate, consistently routed channel and verify pull-up values against the bus capacitance and operating speed. Do not add long stubs or route the channels as shared uncontrolled branches. Confirm the host-side SPI signal integrity, including clock-edge timing, trace length, and return-path continuity. Use the manufacturer's pin-description table to identify whether any general-purpose pins can safely serve as alternate functions in the intended design.
A common design error is treating the PI7C1401AZFEX as a generic eight-port I2C expander: its downstream architecture consists of four I2C interfaces, while I2C or SPI is selected at the host side. Also avoid assigning duplicate addresses among connected modules without a validated isolation or multiplexing strategy. Firmware and hardware should define startup states for absent modules, interrupted transactions, held interrupt lines, and modules that remain powered during board-level fault recovery.
Información de cumplimiento
The available product information confirms the PI7C1401AZFEX identity, interface architecture, supply range, and package, but it does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
