參數(shù)資料
型號: KS8721BL
廠商: Micrel Inc
文件頁數(shù): 10/35頁
文件大?。?/td> 0K
描述: IC TXRX PHY 10/100 3.3V 48LQFP
標準包裝: 250
類型: 收發(fā)器
驅(qū)動器/接收器數(shù): 1/1
規(guī)程: MII,RMII
電源電壓: 2.375 V ~ 2.625 V
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 托盤
配用: 576-1007-ND - BOARD EVAL EXPERIMENT KS8721BL
Micrel, Inc.
KS8721BL/SL
June 2009
18
M9999-062509-1.3
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.
7
24
+3.3V
KS8721BL/SL
8
1223
3536
3943
44
VDDI/O
VDDC
VDDPLL
Voltage
Regulator
10F
+2.5V
+2.5VPLL
Ferrite Bead
10F
13
47
+2.5VA
Ferrite Bead
VDDTX
OUT
IN
GND
42
31
38
10F
VDDRX
VDDRCV
Figure 4. Circuit Design
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.”
2.5V/3.3V Supply
3.3V Supply with Built-in Regulator
Part Number
Package
Part Number
Package
KS8721B
48-SSOP
KS8721SL
48-SSOP
KS8721BT
48-TQFP
KS8721BL
48-LQFP
KS8721BI
48-SSOP
KS8721SLI
48-SSOP
Table 2. Drop-In Replacement
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參數(shù)描述
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