參數(shù)資料
型號(hào): MCP4251-503E/SL
廠商: Microchip Technology
文件頁(yè)數(shù): 20/59頁(yè)
文件大小: 0K
描述: IC DGTL POT 50K 2CH 14SOIC
標(biāo)準(zhǔn)包裝: 57
接片: 257
電阻(歐姆): 50k
電路數(shù): 2
溫度系數(shù): 標(biāo)準(zhǔn)值 150 ppm/°C
存儲(chǔ)器類(lèi)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(lèi)型: 表面貼裝
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 14-SOIC
包裝: 管件
產(chǎn)品目錄頁(yè)面: 676 (CN2011-ZH PDF)
其它名稱(chēng): MCP4251-503-E/SL
MCP4251-503-E/SL-ND
Micrel, Inc.
KSZ8051MNL/RNL
July 2010
27
M9999-070910-1.0
Back-to-Back Mode – 100Mbps Copper Repeater / Media Converter
Two KSZ8051MNL/RNL devices can be connected back-to-back to form a 100Base-TX to 100Base-TX copper repeater.
A KSZ8051MNL/RNL and a KSZ8041FTL can be connected back-to-back to provide a low cost media converter solution.
Media conversion is between 100Base-TX copper and 100Base-FX fiber. On the copper side, link up at 10Base-T is not
allowed, and is blocked during auto-negotiation.
Figure 5. KSZ8051MNL/RNL and KSZ8041FTL Back-to-Back Media Converter
MII Back-to-Back Mode (KSZ8051MNL only)
In MII Back-to-Back mode, a KSZ8051MNL interfaces with another KSZ8051MNL, or a KSZ8041FTL to provide a
complete 100Mbps copper repeater, or media converter solution, respectively.
The KSZ8051MNL devices are configured to MII Back-to-Back mode after power-up or reset with the following:
Strapping pin CONFIG[2:0] (pins 18, 29, 28) set to ‘110’
A common 25MHz reference clock connected to XI (pin 9)
MII signals connected as shown in the following table.
KSZ8051MNL (100Base-TX copper)
[Device 1]
KSZ8051MNL (100Base-TX copper)
[Device 2]
Pin Name
Pin Number
Pin Type
Pin Name
Pin Number
Pin Type
RXC
19
Output
TXC
22
Input
RXDV
18
Output
TXEN
23
Input
RXD3
13
Output
TXD3
27
Input
RXD2
14
Output
TXD2
26
Input
RXD1
15
Output
TXD1
25
Input
RXD0
16
Output
TXD0
24
Input
TXC
22
Input
RXC
19
Output
TXEN
23
Input
RXDV
18
Output
TXD3
27
Input
RXD3
13
Output
TXD2
26
Input
RXD2
14
Output
TXD1
25
Input
RXD1
15
Output
TXD0
24
Input
RXD0
16
Output
Table 3. MII Signal Connection for MII Back-to-Back Mode (100Base-TX Copper Repeater)
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