82598EB Datasheet, PDF (541/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Power Supply Sequencing
Table 7-6. Power Sequencing
Symbol
Parameter
Min
Max
units
T3_1.8
VCC3P3 (3.3 V dc) stable to VCC1P8 (1.8 V dc)
0.01
100
ms
stable
V_{1.2_1.8}
VCC1P2 (1.2 V dc) to VCC1P8 (1.8 V dc) ramp
difference - fastest¹
0
0.3
V
T_{1.8_1.2}
VCC1P8 (1.8 V dc) to VCC1P2 (1.2 V dc) -
slowest^1,2
N/A
0.5
ms
T_{3_1.2}
VCC3P3 (3.3 V dc) stable to VCC1P2 (1.2 V dc)
0.01
100.5
ms
stable
1. If board designers have difficulty meeting this parameter, use the LAN_PWR_GOOD (external) timing parameter instead (see
Section 7.6.6.1).
2. Measured at a level of 0.4 V dc.
V
1.8V
1.2V
V1.2_1.8
0.4V
T
T1.2_1.8
Fastest 1.2V ramp
Slowest 1.2V ramp
Figure 7-1. Ramp: 1.8 V dc and 1.2 V dc Relationship
Figure notes:
• If VCC1P2 (1.2 V dc) leading (fastest) VCC1P8 (1.8 VDC), VCC1P2 (1.2 V dc) must not be more
than 0.3 V dc maximum voltage difference.
• If VCC1P2 (1.2 V dc) lagging (slowest) VCC1P8 (1.8 VDC), VCC1P2 (1.2 V dc) must not lag
VCC1P8 (1.8 V dc) by more than 0.5 ms maximum (measured at 0.4 V dc).
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