Data Sheet

Ethernet Controller I210 —Electrical/Mechanical Specification
786
11.3.1.1 Power On/Off Sequence
On power-on, after 3.3V reaches 90% of its final value, all voltage rails (1.5V and 0.9V) are allowed 20
ms maximum to reach their final operating values. However, to keep leakage current at a minimum, it
is recommended to turn on power supplies almost simultaneously (with delay between supplies at most
a few milliseconds).
For power-down, it is recommended to turn off all power rails at the same time and let power supply
voltage decay.
Parameter Description Min Max Units
Overshoot Duration
Maximum overshoot allowed duration.
(At that time delta voltage should be lower
than 5mv from steady state voltage)
0.0 0.05 mS
Decoupling Capacitance Capacitance range 15 μF
Capacitance ESR
Equivalent series resistance of output
capacitance
50 M Ω
1. Power supply voltage with ripple should not be below minimum power supply operating range.
Table 11-2. Power Sequencing
Symbol Parameter Min Max Units
T
3_09
VCC3P3 (3.3V) power supply stable to VCC0P9 (0.9V) power
supply stable
1
3
20 ms
T
3_15
VCC3P3 (3.3V) power supply stable to VCC1P5 (1.5V) power
supply stable
1
3
20 ms
Tm-per 3.3V power supply to PE_RST_N de-assertion
1
1. If external LAN_PWR_GOOD is used, this time should be kept between LAN_PWR_GOOD assertion and PE_RST_N de-assertion.
2. Parameter relevant only if external LAN_PWR_GOOD used.
3. With external power supplies.
100 ms
Tlpg Power Supplies Stable to LAN_PWR_GOOD assertion 0 ms
Tlpg-per LAN_PWR_GOOD assertion to PE_RST_N de-assertion
1
100 ms
Tper-m PE_RST_N off before 3.3V power supply down 0 ms
Tlpgw LAN_PWR_GOOD de-assertion time
2
1 ms