VSC7440 datasheet(417/444 Pages) MICROSEMI

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Electrical Specifications

VMDS-10492 VSC7440 Datasheet Revision 4.2

400

6.3.2

Power Consumption

The following table shows power consumption values when the device is at maximum configuration; all

interfaces and functions enabled (2 × cuPHY + 2 × GbE (dual media), 2 × GbE, 4 × 2.5 GbE,

2×10 GbE.

The following table shows typical power consumption reductions for reduced configurations compared to

maximum configurations.

6.3.3

Power Supply Sequencing

During power on and off, VDD_A, VDD_HS, and VDD_VS must never be more than 300 mV above VDD.

VDD_HS and VDD_VS must be powered, even if the associated interface is not used. These power

supplies must not remain at ground or left floating.

A maximum delay of 100 ms from VDD_IODDR to VDD is recommended. There is no requirement from VDD

to VDD_IODDR.

The VDD_IODDR supply can remain at ground or left floating if not used. If VDD_IODDR is grounded,

DDR_Vref must also be grounded.

There are no sequencing requirements for VDD_IO.

The nRESET and JTAG_nTRST inputs must be held low until all power supply voltages have reached

their recommended operating condition values.

6.4

Operating Conditions

The following table shows the recommended operating conditions.

Table 320 •

Power Consumption

Parameter

Typical

Maximum

(TJ_MAX = 110 °C)

Maximum

(TJ_MAX = 125 °C)

Unit

Power consumption, VDD_VS and VDD_HS = 1.0 V

4.0

6.9

7.2

Power consumption, VDD_VS and VDD_HS = 1.2 V

4.1

6.2

6.6

Table 321 •

Power Consumption, Reduced Configuration

Parameter

Typical

Unit

Power consumption reduction for each cuPHY port disabled

0.3

Power consumption reduction for each 10 GbE port disabled

0.3

Table 322 •

Recommended Operating Conditions

Parameter

Symbol

Minimum Typical

Maximum Unit

Power supply voltage for core supply

VDD

0.95

1.0

1.05

Power supply voltage for analog circuits

VDD_A

0.95

1.0

1.05

Power supply voltage for 10G interface, 1.0 V1

VDD_HS

0.95

1.0

1.05

Power supply voltage for 10G interface, 1.2 V

VDD_HS

1.14

1.2

1.26

Power supply voltage for 1G and 6G interfaces, 1.0 V2

VDD_VS

0.95

1.0

1.05

Power supply voltage for 1G and 6G interfaces, 1.2 V

VDD_VS

1.14

1.2

1.26

Power supply voltage for copper PHY analog circuits

VDD_AL

0.95

1.0

1.05

Power supply voltage for copper PHY interface

VDD_AH

2.375

2.5

2.625

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