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
• 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: 0oC to +70oC
• Industrial Temperature Range: –40oC to +85oC
• Available in 48-pin SSOP and LQFP