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| LAN9221_12 Datasheet, PDF (136/151 Pages) SMSC Corporation – High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O | |||
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High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
6.9
Power Sequence Timing
Figure 6.8 illustrates the deviceâs power sequencing requirements. Device power supplies can turn on
in any order provided they all reach operational levels within the specified time period tpon. Device
power supplies can turn off in any order provided they all reach 0 volts within the specified time period
tpoff.
tpon
tpoff
VDDVARIO
3.3V (All)
Figure 6.8 Power Sequence Timing
Table 6.9 Power Sequence Timing
PARAMETER
DESCRIPTION
MIN TYP MAX UNITS
tpon
Power supply turn on time
tpoff
Power supply turn off time
50
ms
500
ms
NOTES
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.
Revision 2.9 (03-01-12)
136
DATASHEET
SMSC LAN9221/LAN9221i
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