KSZ8721CL TR Micrel Inc, KSZ8721CL TR Datasheet - Page 17

• Manufacturer Part Number: KSZ8721CL TR
• Description: TXRX 10/100 3.3V 48-LQFP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721CL TR

• Number Of Drivers/receivers: 1/1
• Protocol: MII
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: KSZ8721CLTR; KSZ8721CLTR

Circuit Design Reference for Power Supply
Micrel’s integrated built-in, voltage regulator technology allows the user to save BOM costs on both existing and future designs
with the use of the new KS8721CL single supply, single port, 10/100 Ethernet PHY.
The circuit design in Figure 4 shows the power connections for the power supply: the 3.3V to VDDI/O is the only input power
source and the 2.5V at VDDRCV, pin 38, is the output of the voltage regulator that needs to supply through the rest of the 2.5V
VDD pins via the 2.5V power plane.
April 2005
KS8721CL
+3.3V
24
7
VDDI/O
VDDI/O
VDDC
+2.5V
13
10µF
Ferrite Bead
Figure 4. Circuit Design
10µF
+2.5VPLL
VDDPLL
IN
47
17
Regulator
10µF
Voltage
Ferrite Bead
GND
8
10µF
12
+2.5VA
OUT
23
42
35
31
36
39
38
KS8721CL
43
44
10µF
10µF
M9999-041405
Micrel, Inc.