Diodes Incorporated
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I2C-bus/SPI to Quad Port Expander

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The PI7C1401 is a I²C-bus/SPI Quad Port Expander, it’s specifically designed to manage common port types such as SFP+ and QSFP+. The PI7C1401 provides an I²C-bus/SPI interface, an interrupt output to host and four I²C interfaces, general purpose pins for low-speed control signals to the modules. The PI7C1401 can be used a wide range of applications such as Networking, Telecom, Storage/Data center, Embedded. The typical usage for this device is high volume applications requiring an "expander" to aggregate all low-speed control and I²C signals across four ports and presents a single I²C or SPI interface to host. Multiple PI7C1401s can be used in high-port-count applications with one I²C or SPI to host. The system BOM cost can be cut by using smaller IO count control device(FPGAs, CPLDs, MCUs) and by reducing routing layer congestion.


  • Support Low-speed signals management and I²C aggregation across four ports
  • Support multiple PI7C1401s to control high-port-count through a single host interface
  • Selectable I²C (up to 1Mhz) or SPI (up to 33Mhz) host control interface
  • Automatic pre-fetching of critical, user-specified data from the modules
  • Advanced LED features for port status indication, including programmable blinking and dimming
  • Support standard SFF-8431, SFF-8472, SFF-8436, SFF-8679, INF-8074 and other such low-speed electrical interfaces, including a dedicated 100/400Khz I²C interface to each port
  • Customizable events which trigger an interrupt to the host
  • Broadcast Mode allows writes to all ports simultaneously
  • Separate host-side I/O voltage: 1.8V to 3.3V
  • Industrial Temperature Range: -40°C to +85°C
  • ESD: (HBM) 4KV, (CDM) 2KV
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • Telecom for Wireless Base Station
  • Enterprise Switch/Router
  • Embedded System for Video
  • Storage for Data Center

Product Specifications

Product Parameters

Host Interface I2C/SPI
Aggregation Port 4
Automatic Pre-Fetch Yes
OperatingTemperatureRange  (°C) -40 to 85
Pins 56

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