LAN8720AI datasheet(64/79 Pages) SMSC

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

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8720A/LAN8720Ai

DATASHEET

5.2

Operating Conditions**

Supply Voltage (VDDIO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.62V to +3.6V

Analog Port Supply Voltage (VDD1A, VDD2A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3.0V to +3.6V

Digital Core Supply Voltage (VDDCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.14V to +1.26V

Ethernet Magnetics Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.25V to +3.6V

Ambient Operating Temperature in Still Air (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Note 5.4

**Proper operation of the device is guaranteed only within the ranges specified in this section. After

the device has completed power-up, VDDIO and the magnetics power supply must maintain their

voltage level with +/-10%. Varying the voltage greater than +/-10% after the device has completed

power-up can cause errors in device operation.

Note: Do not drive input signals without power supplied to the device.

5.3

Power Consumption

This section details the device power measurements taken over various operating conditions. Unless

otherwise noted, all measurements were taken with power supplies at nominal values (VDDIO, VDD1A,

VDD2A = 3.3V, VDDCR = 1.2V). See Section 3.8.3, "Power-Down Modes," on page 38 for a

description of the power down modes. For more information on the REF_CLK modes, see Section

3.7.4, "nINTSEL: nINT/REFCLKO Configuration," on page 33.

5.3.1

REF_CLK In Mode

Table 5.1 Device Only Current Consumption and Power Dissipation (REF_CLK In Mode)

POWER PIN GROUP

VDDA3.3

POWER

PINS(mA)

VDDCR

POWER

PIN(mA)

VDDIO

POWER

PIN(mA)

TOTAL

CURRENT

(mA)

TOTAL

POWER

(mW)

100BASE-TX /W TRAFFIC

Max

0.6

159

Typical

0.5

148

Min

0.3

Note 5.6

10BASE-T /W TRAFFIC

Max

9.7

0.6

Typical

8.9

0.5

Min

8.3

0.3

Note 5.6

ENERGY DETECT POWER

DOWN

Max

4.2

3.0

0.2

7.4

Typical

4.1

1.9

0.2

6.2

Min

3.9

1.9

5.8

Note 5.6

GENERAL POWER DOWN

Max

0.4

2.8

0.2

3.4

11.2

Typical

0.3

1.8

0.2

2.3

7.6

Min

0.3

1.7

3.0

Note 5.6

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