General Description

Operating at 2.5 volts to meet low voltage and low power requirements, the KS8721B/BT is a 10BaseT/100BaseTX/FX Physical Layer Transceiver, which provides an MII to transmit and receive data. It contains the 10BaseT Physical Medium Attachment (PMA), Physical Medium Dependent (PMD), and Physical Coding Sub-layer (PCS) functions. Moreover, the KS8721B/BT has on-chip 10BaseT output fi ltering, which eliminates the need for external fi lters and allows a single set of line magnetics to be used to meet requirements for both 100BaseTX and 10BaseT.

Features

• Single chip 100BaseTX/100BaseFX/10BaseT physical layer solution

• 2.5V CMOS design, power consumption <200mW (excluding output driver current )

• Fully compliant to IEEE 802.3u standard

• Supports Media Independent Interface (MII) and Reduced MII (RMII)

• Supports 10BaseT, 100BaseTX and 100BaseFX with Far_End_Fault Detection

• Supports power down mode and power saving mode

• Confi gurable through MII serial management ports or via external control pins

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

• On-chip built-in analog front end fi ltering for both 100BaseTX and 10BaseT

• 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

• 2.5V/3.3V tolerance on I/O

• Commercial temperature range: 0°C to +70°C

• Industrial temperature range: –40°C to +85°C

• Available in 48-pin SSOP and TQFP