88e3015 Marvell Semiconductor, Inc., 88e3015 Datasheet - Page 34

• Manufacturer Part Number: 88e3015
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

Table 16:
Supply
C on f ig ur at i on
Op tio n
Single 3.3V supply
3.3V supply and 1.2V
supply
Single 2.5V supply
2.5V supply and 1.2V
supply
2.5 Regulators and Power Supplies
The 88E3015/88E3018 device can operate from a single 2.5V or 3.3V supply if the regulators are used. If regula-
tors are not used then a 2.5V and 1.2V supply are needed.
usage.
The VDDO supply can run at 2.5V or 3.3V and that the VDDOR supply can run at 2.5V or 3.3V. The 2.5V gener-
ated by the 2.5V regulator must not be used to supply VDDO or VDDOR.
The AVDDC and AVDDX must always be at the same voltage level if AVDDX is not floating.
The 2.5V regulator is not used if CTRL25 is left floating and not connected to a BJT.
The 1.2V regulator is disabled when DIS_REG12 is tied to VDDO. It is enabled when DIS_REG12 is tied to VSS.
2.5.1 AVDD
AVDD is used as the 2.5V analog supply. AVDD can be supplied externally with 2.5V, or via the 2.5V regulator.
2.5.2 AVDDC
AVDDC is used as the high voltage analog supply and can run on 2.5V or 3.3V.
AVDDC must be supplied externally. Do not use the 2.5V regulator to power AVDDC.
2.5.3 AVDDR
AVDDR is used as the 2.5V supply to the internal regulator that generates the 1.2V digital supply.
AVDDR can be supplied externally with 2.5V, or via the 2.5V regulator.
Doc. No. MV-S103657-00, Rev. C
Page 34
Power Supply Options
Pin N ame
C om m ent
Need External BJT
DIS_REG12 = VSS
Need External BJT
DIS_REG12 = VDDO
Do not connect exter-
nal BJT
DIS_REG12 = VSS
Do not connect exter-
nal BJT
DIS_REG12 = VDDO
88E3015/88E3018
Integrated 10/100 Fast Ethernet Transceiver
Document Classification: Proprietary Information
AVDDC
Hig h
Vo l ta ge
Ana log
3.3V
External
3.3V
External
2.5V External
2.5V External
CONFIDENTIAL
AVDDX
2.5V
Regulator
3.3V
External
3.3V
External
Floating
Floating
Table 16
lists the valid combinations of regulator
AVDD
2.5V
Ana log
2.5V
from BJT
2.5V
from BJT
2.5V
External
2.5V
External
October 26, 2006, Advance
AVDDR
1.2V
Regulat or
2.5V
from BJT
2.5V
from BJT
2.5V
External
2.5V
External
Copyright © 2006 Marvell
DVDD
1.2V Dig i ta l
1.2V from
Internal
Regulator
1.2V
External
1.2V from
Internal
Regulator
1.2V
External