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Operating with a 2.5V core to meet low-voltage and low-power requirements, the KSZ8721BL and KSZ8721SL are 10BASE-T/100BASE-TX/FX Physical Layer Transceivers that use MII and RMII interfaces to transmit and receive data. They contain 10BASE-T Physical Medium Attachment (PMA), Physical Medium Dependent (PMD), and Physical Coding Sub-layer (PCS) functions. The KSZ8721BL/SL also have on-chip 10BASE-T output filtering. This eliminates the need for external filters and allows a single set of line magnetics to be used to meet requirements for both 100BASE-TX and 10BASE-T.
The KSZ8721BL/SL automatically configure themselves for 100 or 10Mbps and full-duplex or half-duplex operation, using an on-chip auto-negotiation algorithm. They are the ideal physical layer transceiver for 100BASE-TX/10BASE-T applications.

Features
·Single Chip 100BASE-TX/100BASE-FX/ 10BASE-T Physical Layer Solution
·2.5V CMOS Design;2.5/3.3V Tolerance on I/O
·3.3V Single Power Supply with Built-In Voltage Regulator; Power Consumption <340 mW (Including Output Driver Current)
·Fully Compliant to IEEE 802.3u Standard
·Supports MII and Reduced MII (RMII)
·Supports 10BASE-T,100BASE-TX, and 100BASE-FX with Far-End Fault Detection
·Supports Power Down and Power Saving Modes
·Configurable Through MII Serial Management Ports or via External Control Pin
·Supports Auto-Negotiation and Manual Selection for 10/100 Mbps Speed and Full-Duplex/ Half Duplex Modes
·On-Chip, Built-In, Analog Front-End Filtering for Both 100BASE-TX and 10BASE-T
·LED Outputs for Link,Activity, Full-Duplex/ Half Duplex, Collision, and Speed
·Supports Back-to-Back, FX to TX for Media Converter Applications
·Supports MDI/MDI-X Auto-Crossover
·KSZ8721BL is a Drop-In Replacement for the KSZ8721BT in the Same Footprint
·KSZ8721SL is a Drop-In Replacement for the KSZ8721B in the Same Footprint
·Commercial Temperature Range:0°C to +70℃
·Industrial Temperature Range:-40°C to +85°C
·Available in 48-pin SSOP and LQFP Packages