USB3280 SMSC Corporation, USB3280 Datasheet - Page 11

• Manufacturer Part Number: USB3280
• Description: Hi-Speed USB Device PHY
• Manufacturer: SMSC Corporation

Hi-Speed USB Device PHY with UTMI Interface
Datasheet
SMSC USB3280
REG_EN
VDDA1.8
VDD3.3
VDD1.8
(V18A)
NAME
(REN)
(GND)
(V33)
(V18)
VSS
DIRECTION
Input
N/A
N/A
N/A
N/A
Table 4.5 Power and Ground Signals
ACTIVE
LEVEL
High
N/A
N/A
N/A
N/A
DATASHEET
3.3V Supply. Provides power for USB 2.0 Transceiver, UTMI+
Digital, Digital I/O, and Regulators.
On-Chip 1.8V regulator enable. Connect to ground to disable on
chip VDDA1.8V and VDD1.8V regulators. When regulators are
disabled, external 1.8V must be supplied to VDDA1.8 and
VDD1.8 pins.
1.8V Digital Supply. Supplied by On-Chip Regulator when
REG_EN is active. Low ESR 4.7uF minimum capacitor
requirement when using internal regulators.
Common Ground.
1.8V Analog Supply. Supplied by On-Chip Regulator when
REG_EN is active. Low ESR 4.7uF minimum capacitor
requirement when using internal regulators.
11
DESCRIPTION
Revision 1.2 (10-27-06)