Intel IXF1104 manual 4.7Power Supply Sequencing, 4.7.1Power-UpSequence, 4.7.2Power-DownSequence

IXF1104 4-Port Gigabit Ethernet Media Access Controller

4.7Power Supply Sequencing

Follow the power-up and power-down sequences described in this section to ensure correct IXF1104 operation. The sequence described in Section 4.7 covers all IXF1104 digital and analog supplies.

Caution: Failure to follow the sequence described in this section might damage the IXF1104.

4.7.1Power-Up Sequence

Ensure that the 1.8 V analog and digital supplies are applied and stable prior to application of the

2.5 V analog and digital supplies.

4.7.2Power-Down Sequence

Remove the 2.5 V supplies prior to removing the 1.8 V power supplies (the reverse of the power-up sequence).

Caution: Damage can occur to the ESD structures within the analog I/Os if the 2.5 V digital and analog supplies exceed the 1.8 V digital and analog supplies by more than 2.0 V during power-up or power-down.

Figure 5 and Table 19 provide the IXF1104 power supply sequencing.

Figure 5. Power Supply Sequencing

1.8 V Supplies Stable 2.5 V Supplies Stable

				Time
t=0			Sys_Res
Apply	VDD, AVDD1P8_1, and	Apply VDD4, VDD5,
AVDD1P8_2		AVDD2P5_1 and AVDD2P5_2

NOTE: The 3.3 V supply (VDD2 and VDD3) can be applied at any point during this sequence.

62 Datasheet

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004