參數(shù)資料
型號: MCP4251T-104E/ST
廠商: Microchip Technology
文件頁數(shù): 53/59頁
文件大?。?/td> 0K
描述: IC DGTL POT 100K 2CH 14TSSOP
標(biāo)準(zhǔn)包裝: 2,500
接片: 257
電阻(歐姆): 100k
電路數(shù): 2
溫度系數(shù): 標(biāo)準(zhǔn)值 150 ppm/°C
存儲器類型: 易失
接口: 4 線 SPI(芯片選擇)
電源電壓: 1.8 V ~ 5.5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 14-TSSOP
包裝: 帶卷 (TR)
其它名稱: MCP4251T-104-E/ST
MCP4251T-104-E/STTR
MCP4251T-104-E/STTR-ND
MCP4251T-104E/STTR
Micrel, Inc.
KSZ8051MNL/RNL
July 2010
57
M9999-070910-1.0
Magnetics Specification
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode chokes
is recommended for exceeding FCC requirements.
The following tables list recommended magnetic characteristics and qualified magnetics for the KSZ8051MNL/RNL.
Parameter
Value
Test Condition
Turns ratio
1 CT : 1 CT
Open-circuit inductance (min.)
350
μH
100mV, 100kHz, 8mA
Insertion loss (max.)
-1.0dB
100kHz – 100MHz
HIPOT (min.)
1500Vrms
Table 20. Magnetics Selection Criteria
Magnetic Manufacturer
Part Number
Auto MDI-X
Number of Port
Bel Fuse
S558-5999-U7
Yes
1
Bel Fuse (Mag Jack)
SI-46001-F
Yes
1
Bel Fuse (Mag Jack)
SI-50170-F
Yes
1
Delta
LF8505
Yes
1
LANKom
LF-H41S-1
Yes
1
Pulse
H1102
Yes
1
Pulse (low cost)
H1260
Yes
1
Transpower
HB726
Yes
1
TDK (Mag Jack)
TLA-6T718A
Yes
1
Table 21. Qualified Single Port 10/100 Magnetics
Reference Clock – Connection and Selection
A crystal or external clock source, such as an oscillator, is used to provide the reference clock for the KSZ8051MNL/RNL.
For the KSZ8051MNL in all operating modes and for the KSZ8051RNL in RMII – 25MHz Clock Mode, the reference clock
is 25 MHz. The reference clock connections to XI (pin 9) and XO (pin 8), and the reference clock selection criteria are
provided in the following figure and table.
Figure 22. 25MHz Crystal / Oscillator Reference Clock Connection
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