Datasheet

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
Datasheet
Revision 2.9 (03-01-12) 136 SMSC LAN9220
DATASHEET
6.9 Power Sequence Timing
Figure 6.8 illustrates the device’s power sequencing requirements. Device power supplies can turn on
in any order provided they all reach operational levels within the specified time period t
pon
. Device
power supplies can turn off in any order provided they all reach 0 volts within the specified time period
t
poff
.
Figure 6.8 Power Sequence Timing
Note: Power must be applied and removed to all 3.3V power supply pins simultaneously (including
the Ethernet magnetics).
Note: Power must be applied and removed to all VDDVARIO power supply pins simultaneously.
Table 6.9 Power Sequence Timing
PARAMETER DESCRIPTION MIN TYP MAX UNITS NOTES
t
pon
Power supply turn on time 50 ms
t
poff
Power supply turn off time 500 ms
VDDVARIO
3.3V (All)
t
pon
t
poff