LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
Table 11. LXT974 Power Supply Signal Descriptions
Pin#
Symbol
VCC
Type
Signal Description
22, 60, 96
40, 78
-
Power Supply. +5V supply for all digital circuits.
MII Supply. +3.3V or +5V supply for MII. A decoupling capacitor
to digital ground should be supplied for these pins.
VCCMII
-
7, 14, 39, 56, 59, 77, 95, 160
21
GND
-
-
-
-
-
-
-
-
Digital Ground. Ground return for digital supply.
Analog Ground. Ground return for analog supply.
Ground. Ground return for core analog circuitry.
Supply. +5V supply for core analog circuitry.
GNDA
GNDH
VCCH
VCCT
GNDT
VCCR
GNDR
108
107
128, 137, 147, 156
127, 136, 146, 155
125, 134, 144, 153,
121, 122, 131, 141, 150
Transmit Power Supply. +5V supply for transmit circuits.
Transmit Ground. Ground return for transmit supply.
Receive Power Supply. +5V supply for all receive circuits.
Receive Ground. Ground return for receive supply.
Table 12. LXT975 Power Supply Signal Descriptions
Pin#
Symbol
VCC
Type
Signal Description
22, 60, 96
40, 78
-
Power Supply. +5V supply for all digital circuits.
MII Supply. +3.3V or +5V supply for MII. A decoupling capacitor
to digital ground should be supplied for these pins.
VCCMII
-
7, 14, 39, 56, 59, 77, 95, 160
GND
-
-
-
-
-
-
-
-
Digital Ground. Ground return for digital supply.
Analog Ground. Ground return for analog supply.
Ground. Ground return for core analog circuitry.
Supply. +5V supply for core analog circuitry.
21
GNDA
GNDH
VCCH
VCCT
GNDT
VCCR
GNDR
108
107
128, 135, 147, 154
127, 134, 146, 153
125, 132, 144, 151,
121, 122, 131, 137, 141, 150, 156
Transmit Power Supply. +5V supply for transmit circuits.
Transmit Ground. Ground return for transmit supply.
Receive Power Supply. +5V supply for all receive circuits.
Receive Ground. Ground return for receive supply.
18
Datasheet
INTEL [ INTEL ]
