KSZ8721BL 3.3V Integrated Circuit Chip 10 / 100BASE - TX/FX MII Physical Layer Transceiver

General Description

Operating with a 2.5V core to meet low-voltage and lowpower requirements, the KS8721BL and KS8721SL 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 KS8721BL/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 KS8721BL/SL automatically configure themselves for 100 or 10Mbps and full- 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 <340mW (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 pins

Functional Diagram

Features (continued)

• Supports auto-negotiation and manual selection for 10/100Mbps speed and full-/half-duplex modes

• On-chip, built-in, analog front-end filtering for both 100BASE-TX and 10BASE-T

• LED outputs for link, activity, full-/half-duplex, collision, and speed

• Supports back-to-back, FX to TX for media converter applications

• Supports MDI/MDI-X auto-crossover

• KS8721BL is a drop-in replacement for the KS8721BT in the same footprint

• KS8721SL is a drop-in replacement for the KS8721B in the same footprint

• Commercial Temperature Range: 0o C to +70o C

• Industrial Temperature Range: –40o C to +85o C

• Available in 48-pin SSOP and LQFP