參數(shù)資料
型號： LAN8187_06
廠商： SMSC Corporation
英文描述： 【15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM
中文描述： 【15kV的ESD保護(hù)信息產(chǎn)業(yè)部/ RMII快速以太網(wǎng)PHY與HP Auto - MDIX功能和SMSC flexPWRTM
文件頁數(shù)： 31/72頁
文件大?。?/td> 433K
代理商： LAN8187_06
±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR
TM
Datasheet
Revision 1.0 (12-14-06)
31
SMSC LAN8187/LAN8187I
DATASHEET
Note:
X = Dont Care.
4.9
Internal +1.8V Regulator Disable
Part of the LAN8187/LAN8187I SMSC flexPWR
TM
technology is the ability to disable the internal +1.8v
regulator. This further increases the power savings as a more efficient external switching regulator can
provide the necessary +1.8v to the internal PHY circuitry.
4.9.1
Disable the Internal +1.8V Regulator
To disable the +1.8v internal regulator, a pulldown strapping resistor (see
Table 4.4, “Boot Strapping
Configuration Resistors,” on page 32
) is attached from REG_EN to VDDIO. When both VDDIO and
VDDA are within specification, the PHY will sample the REG_EN pin to determine if the internal
regulator should turn on. If the pin is grounded to VSS, then the internal regulator is off, and the system
needs to supply +1.8v +/- 10% to the VDD_CORE pin.
A 4.7uF low ESR and 0.1uF capacitor must be added to VDD_CORE and placed close to the PHY.
This capacitance provides decoupling of the external power supply noise and ensures stability of the
internal regulator.
4.9.2
Enable the Internal +1.8V Regulator
To enable the internal regulator, a pull-up resistor (see
Table 4.4, “Boot Strapping Configuration
Resistors,” on page 32
) to VDDIO needs to be added to the REG_EN pin.
A 4.7uF low ESR and 0.1uF capacitor must be added to VDD_CORE and placed close to the PHY.
This capacitance provides decoupling of the external power supply noise and ensures stability of the
internal regulator.
4.10
(TX_ER/TXD4)/nINT Strapping
The TX_ER, TXD4 and nINT functions share a common pin. There are two functional modes for this
pin, the TX_ER/TXD4 mode and nINT (interrupt) mode. The RXD3 pin is used to select one of these
two functional modes.
The RXD3 pin is latched on the rising edge of the internal reset (nreset) to select the mode. The
system designer must float the RXD3 pin for nINT mode or pull-low with an external resistor (see
Figure 4.4 Direct cable connection vs. Cross-over cable connection.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LAN8187I 制造商:SMSC 制造商全稱:SMSC 功能描述:High-Performance MII and RMII 10/100 Ethernet PHY with HP Auto-MDIX
LAN8187I-JT 功能描述:以太網(wǎng) IC HiPerfrm Ethrnt PHY RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
LAN8187-JT 功能描述:以太網(wǎng) IC HiPerfrm Ethrnt PHY RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
LAN83C171 制造商:SMSC 制造商全稱:SMSC 功能描述:EPIC/XF ACPI/PC 97 Compliant Integrated PCI 10/100 Mbps Fast Ethernet Controller
LAN83C171 WAF 制造商:SMSC 功能描述:
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