LAN9220 datasheet(21/151 Pages) SMSC

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16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

Datasheet

SMSC LAN9220

Revision 2.9 (03-01-12)

DATASHEET

2.2

External Pull-Up/Pull-Down Resistors

As detailed in Table 2.6, when using an external pull-up or pull-down resistor, the required value is

dependant on the operating voltage. Usage of recommended pull-up/pull-down resistor values is

required to ensure proper operation.

2.3

Buffer Types

Note 2.1

Sink and source capabilities are dependant on the VDDVARIO voltage. Refer to Section

7.6, "DC Electrical Specifications" for additional information.

Note 2.2

When operating at reduced VDDVARIO voltage levels (less than 3.0V), do not rely on

internal pull-up and pull-down resistors to determine signal state. Refer to Section 2.2,

"External Pull-Up/Pull-Down Resistors" and the individual signal descriptions in Section

2.1, "Pin List" for more information.

Table 2.6 External Pull-Up/Pull-Down Resistor Values

I/O VOLTAGE

PULL-UP/PULL-DOWN RESISTOR VALUE (OHMS)

3.3V +/- 300mV

10K

2.5 +/- 10%

7.5K

1.8V +/- 10%

4.7K

Table 2.7 Buffer Types

TYPE

DESCRIPTION

VIS

Variable voltage input pin

VO12

Variable voltage output with 12mA sink and 12mA source (Note 2.1)

VOD12

Variable voltage open-drain output with 12mA sink (Note 2.1)

VO8

Variable voltage output 8mA symmetrical drive (Note 2.1)

VOD8

Variable voltage open-drain output with 8 mA sink (Note 2.1)

50uA (typical) internal pull-up (Note 2.2)

50uA (typical) internal pull-down (Note 2.2)

Analog input

Analog output

AIO

Analog bi-directional

ICLK

Crystal oscillator input pin

OCLK

Crystal oscillator output pin

LAN9220 数据表(PDF) 21 Page - SMSC Corporation

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