Micrel, Inc.
KSZ8051MLL
Reference Circuit for Power and Ground Connections
The KSZ8051MLL is a single 3.3V supply device with a built-in regulator to supply the 1.2V core. The power and ground
connections are shown in Figure 6 and Table 6 for 3.3V VDDIO.
Figure 6. KSZ8051MLL Power and Ground Connections
Power Pin
VDD_1.2
VDDA_3.3
VDDIO
VDD_1.2
Pin Number
4
7
25
31
Description
Connect with pin 31 by power trace or plane.
Decouple with 2.2uF and 0.1uF capacitors to ground.
Connect to board’s 3.3V supply thru ferrite bead.
Decouple with 22uF and 0.1uF capacitors to ground.
Connect to board’s 3.3V supply for 3.3V VDDIO.
Decouple with 22uF and 0.1uF capacitors to ground.
Connect with pin 4 by power trace or plane.
Decouple with 0.1uF capacitor to ground.
Table 6. KSZ8051MLL Power Pin Description
July 2010
26
M9999-071210-1.0