317697-001 Datasheet, PDF (47/69 Pages) Intel Corporation – Gigabit Ethernet Controller

82575 Gigabit Ethernet Controller Datasheet
Ripple
Maximum voltage ripple at a
bandwidth equal to 1 MHz
N/A
Overshoot
SettlingTime
Overshoot time upon ramp²
N/A
Overshoot
Maximum voltage allowed^b
N/A
40
0.05
100
mV_peak-peak
ms
mV
1. Good design practices achieve voltage ramps to within the regulation bands in approximately 20 ms or less.
2. Excessive overshoot can affect long term reliability.
Table 7.
Power Supply Sequencing
Symbol
T_{3 18}
T_{18 1}
T_{3 1}
T_m-per, T_m-ppo
T_per-m, T_ppo-m
Parameter
VCC3p3 (3.3 V) stable to VCC1p8
stable
VCC1p8 stable to VCC (1.0 V)
stable
VCC3p3 (3.3 V) stable to VCC
(1.0 V) stable
3.3 V core to GIO_PWR_GOOD
and MAIN_PWR_OK on
GIO_PWR_GOOD, MAIN_PWR_OK
off before 3.3 V core down
Min
0
0
0
TBD
0
Max
100
100
Unit
ms
ms
mV
ms
ms
VCCP (3.3V)
VCC1p8 (1.8V)
VCC/VCC1p0(1V)
Power-on Reset
(internal)
Main power stable
GIO_PWR_GOOD
MAIN_PWR_OK
Aux power stable
T3_18
T18_1
T3_1
Tlpg
Main Power stable
Tm-per
Tm-ppo
Tlpg-per
Tper-m
Tppo-m
Tlpgw
Figure 2.
Voltage Power Sequencing Options
To meet the 375 mA inrush current requirements (not including external capacitors)
the ramp time should be 5 ms -100 ms on all power rails. For faster ramps (100 us - 5
ms), expect higher inrush current due to the high charging current of the decoupling
capacitors of 3.3 V, 1.8 V and 1.0 V rails.
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