KSZ8895FQXI

Controllers Overview

The KSZ8895FQXI is a Layer 2 managed, five-port Ethernet switch integrated with four 10/100Base-T/TX transceivers and one 100Base-FX fiber transceiver on Port 4. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 128-pin PQFP package. The device supports data rates of 10 Mb/s and 100 Mb/s with full-duplex and half-duplex modes. Power supply requirements include a minimum voltage of 1.14 V and a maximum of 3.465 V for the core, while I/O voltages support 3.3V, 2.5V, and 1.8V. Interfaces include MII, RMII, SPI, I2C, and SMI.

Controllers Feature Summary

• Supports IEEE 802.1q VLAN tagging and up to 128 active VLAN groups.
• Provides programmable rate limiting and broadcast storm protection per port.
• Includes LinkMD cable diagnostic capabilities for fault detection.
• Features comprehensive QoS prioritization with 802.1p and DiffServ support.

Controllers Applications

• Industrial control systems
• VoIP phone networks
• Set-top boxes and game consoles
• IPTV point-of-deployment units

Controllers Procurement Notes

Verify the specific suffix 'I' against official Microchip documentation to confirm if it denotes a specific tape-and-reel packaging variant or environmental grade distinct from the standard 'FQX'. Confirm RoHS compliance status and moisture sensitivity level prior to ordering. Ensure the supplier provides valid traceability documents matching the datasheet revision DS00002246B.

Controllers Selection Notes

Select this component when a design requires a mix of copper and fiber connectivity in a single managed switch solution. The FQX variant is appropriate for applications needing a dedicated 100Base-FX port alongside standard RJ-45 ports. Consider the 128-pin PQFP footprint constraints and verify that the host processor can interface via the available MII/RMII or serial management protocols.

Controllers Part Context

This part belongs to the KSZ8895 family of highly integrated Layer 2 managed switches. The family includes MQX, RQX, and MLX variants which differ primarily in their Port 5 interface types (MII vs. RMII) and package styles (PQFP vs. LQFP). The FQX model specifically integrates a fiber optic transceiver on Port 4, distinguishing it from the all-copper MQX configuration.

Controllers Replacement Considerations

Public confirmed substitute part numbers: None identified in verified source material.

Controllers FAQ

What is the specific function of Port 4 on the KSZ8895FQXI?

Port 4 is equipped with a 100Base-FX transceiver, providing fiber optic connectivity, whereas Ports 1, 2, 3, and 5 utilize 10/100Base-T/TX copper transceivers.

How does the KSZ8895FQXI handle MAC address learning?

It utilizes a non-blocking switch fabric with a 1K MAC address lookup table and a store-and-forward architecture for fast packet delivery.

Can the device operate without an external CPU?

Yes, the device supports unmanaged switch mode where control registers can be programmed via an EEPROM connected through the I2C interface.