Features
Benefits
• Single chip 10BASE-T, 100BASE-TX, and
• Supports back-to-back operation for copper-to-fiber media
100BASE-FX physical layer solution
converterapplications.
• Fully compliant to IEEE802.3u standards
• Designed to operate with link partners at all speeds.
• Low-power CMOS design, power consumption
• Increased reliability, greater range of power-sensitive
< 275mW (including output driver current) applications.
• Supports media independent interface (MII) and
• Flexible switch/MAC interfacing options. Optimized pin count
reduced MII (RMII)
interfaces lower cost through reduced trace/simplified routing.
• Delivers robust operation (130 meters+)
• Furnishes Auto MDI/MDI-X
• Operation over the widest variety of cabling plants.
• Automatic detection and correction for straight-through or
crossovercables.
• Offers both power-down and power-saving modes
• Single 3.3V power supply
• Automatically shuts down upon cable removal extending
battery life for mobile applications.
• Easy migration from earlier KS8721B/BT family members.
• Programmable in environments with and without CPU.
• Configurable through MII serial management ports or
via external control pins
• Available in lead-free and industrial temperature versions
• Offered in flexible package options
• Environmentally friendly and rugged.
• KS8721BL in 48-pin LQFP for space-constrained and
KS8721SL in mainstream 48-pin SSOP.
Applications
LAN on Motherboard
Media Converter
Set-Top Box
RJ-45 with
Integrated
Magnetics
Cable/DSLModem
Network Printer
Game Console
KS8721BL/SL
Fast Ethernet PHY
RMII
RJ-45 with
Integrated
Magnetics
MII/
RMII
KS8721BL/SL
KS8721BL/SL
Fast Ethernet PHY
Fiber
Module
Print Engine
ASIC
Fast Ethernet PHY
Network Printer Application
Media Converter Application
Contact Micrel Semiconductor
Location
Corporate HQ
Eastern USA
Central USA
Western USA
China
Address
Telephone
Fax
1849 Fortune Drive
San Jose, CA 95131 USA
+1 (408) 944-0800
+1 (609) 654-0078
+1 (972) 393-2533
+1 (408) 944-0800
+86 (755) 8302-7618
+82 (2) 3466-3000
+886 (2) 8751-0600
+65-6832-7692
+1 (408) 474-1000
+1 (609) 546-0989
+1 (972) 393-2540
+1 (408) 914-7878
+86 (755) 8302-7637
+82 (2) 3466-2999
+886 (2) 8751-0746
+65-6832-7693
93 Branch Street
Medford, NJ 08055 USA
Coppell, TX 75019 USA
San Jose, CA 95131 USA
ShenZhen, PR China 518026
Seoul 135-080 Korea
722 S. Denton Tap Suite 130
2180 Fortune Drive
Room 712, Block B, Intl. Chamber of Commerce Bldg., Fuhua Rd 1, Futian
4F, KTB Building, 826-14, Yeoksam-dong, Kangnam-ku
4F, No. 18, Lane 321, Yang-Guang Street, Nei-Hu Chu
8 Temasek Blvd., #42-01 Suntec Tower Three
1-16-15 Dogenzaka, Shibuyaku
Korea
Taiwan
Taipei, 11475 Taiwan, R.O.C.
Singapore 038988
Singapore
Japan
Tokyo 150-0043 Japan
+81 (3) 5428-0871
+44 1635 524455
+33 (0) 1-6092-4190
+81 (3) 5428-0872
+44 1635 524466
+33 (0) 1-6092-4189
Europe
1st Floor, 3 Lockside Place, Mill Lane
10, avenue du Quebec, Villebon BP116
Newbury, Berks RG14 5QS UK
Courtaboeuf Cedex 91944 France
Western Europe
Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.474.1000 HTTP:// www.micrel.com
Stock Code: M1016-070604