Specifications

ASIX ELECTRONICS CORPORATION
35
AX88772
USB to 10/100 Fast Ethernet/HomePNA Controller
8.2 Power Consumption
8.2.1 Internal Phy
Symbol Description Condition Min Typ Max Units
IVDDK2 Current consumption of VDDK/VDD2,
2.5V
- 25.4 - mA
IVDD3 Current consumption of VDD3, 3.3V - < 1 - mA
IAVDDK Current consumption of AVDDK, 2.5V - 69.3 - mA
IAVDD3 Current consumption of AVDD3, 3.3V
Operating at Ethernet
100Mbps full duplex
mode and USB High
speed mode
- 51.1 - mA
ΘJC
Thermal resistance of junction to case 16.5 °C/W
ΘJA
Thermal resistance of junction to ambient Still air 46 °C/W
8.2.2 Operating through MII Interface with Internal Ethernet PHY Power-down
Symbol Description Condition Min Typ Max Units
IVDDK2 Current consumption of VDDK/VDD2,
2.5V
- 25.4 - mA
IVDD3 Current consumption of VDD3, 3.3V - < 1 - mA
IAVDDK Current consumption of AVDDK, 2.5V - < 2 - mA
IAVDD3 Current consumption of AVDD3, 3.3V
Operating in Ethernet
100Mbps full duplex
mode through MII
interface and in USB
High speed mode. The
embedded Ethernet
PHY is powered
down
b
y IPPD bit in
Software Reset
Register
- 51.1 - mA
8.3 Power-up Sequence
At power-up, AX88772 requires the VDD3/AVDD3 power supply to rise to nominal operating voltage within Trise3 and
the VDDK/AVDD2/AVDDK power supply to rise to nominal operating voltage within Trise2.
Symbol Parameter Condition Min Typ Max Unit
T
rise3
3.3V power supply rise time From 0V to 3.3V - - 10 ms
T
rise2
2.5V power supply rise time From 0V to 2.5V - - 10 ms
T
delay32
3.3V rise to 2.5V rise time delay -5 - 5 ms
0V
3.3V
Trise3
0V
2.5V
Trise2
Tdelay32
VDDK/VDD2/AVDDK
VDD3/AVDD3