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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09) 68 SMSC LAN8720/LAN8720i
DATASHEET
Note: The current at VDDCR is either supplied by the internal regulator from current entering at
VDD2A, or from an external 1.2V supply when the internal regulator is disabled.
Note 7.1 This is calculated with full flexPWR features activated: VDDIO = 1.8V and internal regulator
disabled.
Note 7.2 Current measurements do not include power applied to the magnetics or the optional
external LEDs.
7.1.3.2 Power Consumption Device Only 50MHz REF_CLK OUT 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 50MHz REF_CLK OUT mode, see Section 4.7.2
.
Table 7.4 Power Consumption Device Only (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-T /W TRAFFIC
Max 27.1 20.4 0.6 48.1 158.7
Typical 25.7 18.5 0.5 44.7 147.5
Min 22.4 17.4 0.3 40.1 95.3
Note 7.1
10BASE-T /W TRAFFIC
Max 9.7 13 0.6 23.3 76.9
Typical 8.9 11.8 0.5 21.2 70
Min 8.3 11.1 0.3 19.7 41.3
Note 7.1
ENERGY DETECT POWER
DOWN
Max 4.2 3 0.2 7.4 24.4
Typical 4.1 1.9 0.2 6.2 20.4
Min 3.9 1.9 0 5.8 15.2
Note 7.1
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 0 2 3
Note 7.1
Table 7.5 Power Consumption Device Only (50MHz REF_CLK OUT MODE)
POWER PIN GROUP
VDDA3.3
POWER
PINS(MA)
VDDCR
POWER
PIN(MA)
VDDIO
POWER
PIN(MA)
TOTAL
CURRENT
(MA)
TOTAL
POWER
(MW)
100BASE-T /W TRAFFIC
Max 27.7 20 6.3 54 178.2
Typical 25.8 18.1 5.8 49.7 164
Min 21.2 14.1 2.9 38.2 92.1
Note 7.3