Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

no change in operation or performance due to the event. All pins on the LAN8720 provide +/-5kV HBM protection.

7.1.1.2IEC61000-4-2 Performance

The IEC61000-4-2 ESD specification is an international standard that addresses system-level immunity to ESD strikes while the end equipment is operational. In contrast, the HBM ESD tests are performed at the device level with the device powered down.

SMSC contracts with Independent laboratories to test the LAN8720 to IEC61000-4-2 in a working system. Reports are available upon request. Please contact your SMSC representative, and request information on 3rd party ESD test results. The reports show that systems designed with the LAN8720 can safely dissipate ±15kV air discharges and ±15kV contact discharges per the IEC61000-4-2 specification without additional board level protection.

In addition to defining the ESD tests, IEC 61000-4-2 also categorizes the impact to equipment operation when the strike occurs (ESD Result Classification). The LAN8720 maintains an ESD Result Classification 1 or 2 when subjected to an IEC 61000-4-2 (level 4) ESD strike.

Both air discharge and contact discharge test techniques for applying stress conditions are defined by the IEC61000-4-2 ESD document.

AIR DISCHARGE

To perform this test, a charged electrode is moved close to the system being tested until a spark is generated. This test is difficult to reproduce because the discharge is influenced by such factors as humidity, the speed of approach of the electrode, and construction of the test equipment.

CONTACT DISCHARGE

The uncharged electrode first contacts the pin to prepare this test, and then the probe tip is energized. This yields more repeatable results, and is the preferred test method. The independent test laboratories contracted by SMSC provide test results for both types of discharge methods.

7.1.2Operating Conditions

Table 7.3 Recommended Operating Conditions

PARAMETER

 

CONDITIONS

MIN

TYP

MAX

UNITS

COMMENT

 

 

 

 

 

 

 

VDD1A, VDD2A

To VSS ground

3.0

3.3

3.6

V

 

 

 

 

 

 

 

 

VDDIO

To VSS ground

1.6

3.3

3.6

V

 

 

 

 

 

 

 

 

 

Input Voltage on

 

 

0.0

 

VDDIO

V

 

Digital Pins

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage on Analog I/O

 

 

0.0

 

+3.6V

V

 

pins (RXP, RXN)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ambient Temperature

T

LAN8720-AEZG

0

 

+85

oC

For Extended Commercial

 

A

 

 

 

 

 

Temperature

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T

LAN8720i-AEZG

-40

 

+85

oC

For Industrial Temperature

 

A

 

 

 

 

 

 

7.1.3Power Consumption

7.1.3.1Power Consumption Device Only REF_CLK IN Mode

Power measurements taken over the operating conditions specified. See Section 5.3.5 for a description of the power down modes. For more information on REF_CLK IN Mode, see Section 4.7.1.

SMSC LAN8720/LAN8720i

67

Revision 1.0 (05-28-09)

 

DATASHEET