AR8327-AL1A-R datasheet(383/394 Pages) ETC2

383 / 394 page

Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

Switch

•

383

4. Electrical Characteristics

4.1 Absolute Maximum Ratings

Table 4-1 summarizes the absolute maximum

ratings and Table 4-2 lists the recommended

operating conditions for the AR8327. Absolute

maximum ratings are those values beyond

which damage to the device can occur.

Functional operation under these conditions,

or at any other condition beyond those

indicated in the operational sections of this

document, is not recommended.

NOTE: For a 2-layer PCB design, we strongly recommend the use of external power — 1.1V for AVDD and

DVDD. This will reduce thermal effects.

NOTE: For a four-layer PCB design, we strongly recommend the use of a reserve external power supply for

AVDD and DVDD when using the internal switch regulator.

4.2 Recommended Operating Conditions

4.3 RGMII/GMII Characteristics

Table 4-3 shows the RGMII/GMII DC

characteristics.

Table 4-1.

Absolute Maximum Ratings

Symbol

Parameter

Max Rating

Unit

AVDD

1.1 V digital core supply voltage

1.6

VDD25_IO

2.5 V digital supply voltage

3.0

DVDD

1.1 V digital supply voltage

1.6

VDD33

Analog 3.3 V supply voltage

4.0

Tstore

Storage temperature

–65 to 150

°C

ESD

Electrostatic discharge tolerance

2000

Table 4-2.

Recommended Operating Conditions

Symbol

Parameter

Min

Typ

Max

Unit

VDD33

3.3 V I/O voltage

3.0

3.3

3.6

VDD25_IO

2.5 V analog/digital

2.4

2.62

2.75

AVDD/DVDD

1.2 V analog/digital

1.15

1.2

1.26

Tambient

Ambient Temperature

C

Junction Temperature

120

C



Thermal Dissipation Coefficient

2.5

C/W

Table 4-3.

RGMII/GMII DC Characteristics

Symbol

Parameter

Min

Max

Unit

VOH

Output high voltage

2.2

—

VOL

Output low voltage

—

0.4

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