KSZ8721SL TR Micrel Inc, KSZ8721SL TR Datasheet - Page 17

• Manufacturer Part Number: KSZ8721SL TR
• Description: IC TXRX PHY 10/100 3.3V 48SSOP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721SL TR

• Number Of Drivers/receivers: 1/1
• Protocol: IEEE 802
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1630 - BOARD EVALUATION FOR KSZ8721SL
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1031-2

Circuit Design Reference for Power Supply
Micrel’s integrated built-in, voltage regulator technology and thoughtful implementation allows the user to save BOM cost on
both existing and future designs with the use of the new KS8721BL/SL 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.
The 2.5V VDD pins make the drop-in replacement with the existing KS8721B/BT part. Table 2 shows the drop-in replacement
from the existing KS8721B/BT to the KS8721SL/BL. Please contact your local Micrel FAE for Application Note AN-117, “Drop-
in Replacement with KS8721BT.”
May 2004
KS8721BL/SL
Part Number
KS8721B
KS8721BT
KS8721BI
+3.3V
2.5V/3.3V Supply
24
7
VDDI/O
VDDI/O
VDDC
+2.5V
48-SSOP
48-SSOP
Package
48-TQFP
Table 2. Drop-In Replacement
13
10 F
Ferrite Bead
Figure 4. Circuit Design
10 F
+2.5VPLL
VDDPLL
IN
47
Part Number
KS8721SL
KS8721BL
KS8721SLI
17
Regulator
10 F
Voltage
3.3V Supply with Built-in Regulator
Ferrite Bead
GND
8
10 F
12
+2.5VA
OUT
23
42
35
31
36
Package
KS8721BL/SL
39
48-SSOP
48-SSOP
48-LQFP
38
43
44
10 F
10 F
M9999-051704
Micrel