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November 28, 2011

IDT 89HPES32H8G2 Data Sheet

Power Consumption

Typical power is measured under the following conditions: 25°C Ambient, 35% total link usage on all ports, typical voltages defined in Table 13

(and also listed below).

Maximum power is measured under the following conditions: 70°C Ambient, 85% total link usage on all ports, maximum voltages defined in

Table 13 (and also listed below).

Note 1: I/O supply of 3.3V is preferred.

Note 2: The above power consumption assumes that all ports are functioning at Gen2 (5.0 GT/S) speeds. Power consumption can be

reduced by turning off unused ports through software or through boot EEPROM. Power savings will occur in VDDPEA, VDDPEHA, and

VDDPETA. Power savings can be estimated as directly proportional to the number of unused ports, since the power consumption of a turned-

off port is close to zero. For example, if 2 ports out of 8 are turned off, then the power savings for each of the above three power rails can be

calculated quite simply as 2/8 multiplied by the power consumption indicated in the above table.

Note 3: Using a port in Gen1 mode (2.5GT/S) results in approximately 18% power savings for each power rail: VDDPEA, VDDPEHA, and

VDDPETA.

Number of Active

Lanes per Port

Core Supply

PCIe Analog

Supply

PCIe Analog

High Supply

PCIe

Transmitter

Supply

I/O Supply

Total

Typ

1.0V

Max

1.1V

Typ

1.0V

Max

1.1V

Typ

2.5V

Max

2.75V

Typ

1.0V

Max

1.1V

Typ

2.5V

Max

2.75V

Typ

Power

Max

Power

8/8/8/8

(Full Swing)

mA

2920

5336

1514

1826

507

514

561

603

24

29

Watts

2.92

5.87

1.51

2.01

1.27

1.41

0.56

0.66

0.06

0.08

6.32

10.04

8/8/8/8

(Half Swing)

mA

2920

5336

1302

1571

507

514

292

313

24

29

Watts

2.92

5.87

1.30

1.73

1.27

1.41

0.29

0.34

0.06

0.08

5.84

9.44

Table 15 PES32H8G2 Power Consumption — 2.5V I/O

Number of Active

Lanes per Port

Core Supply

PCIe Analog

Supply

PCIe Analog

High Supply

PCIe

Transmitter

Supply

I/O Supply

Total

Typ

1.0V

Max

1.1V

Typ

1.0V

Max

1.1V

Typ

2.5V

Max

2.75V

Typ

1.0V

Max

1.1V

Typ

3.3V

Max

3.465

Typ

Power

Max

Power

8/8/8/8

(Full Swing)

mA

2920

5336

1514

1826

507

514

561

603

30

35

Watts

2.92

5.87

1.51

2.01

1.27

1.41

0.56

0.66

0.10

0.12

6.36

10.08

8/8/8/8

(Half Swing)

mA

2920

5336

1302

1571

507

514

292

313

30

35

Watts

2.92

5.87

1.30

1.73

1.27

1.41

0.29

0.34

0.10

0.12

5.88

9.48

Table 16 PES32H8G2 Power Consumption — 3.3V I/O