LAN8810I-AKZE Datasheet, PDF (88/100 Pages) Microchip Technology – GMII 10/100/1000 Ethernet Transceiver with HP Auto-MDIX Support

GMII 10/100/1000 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
5.5.2
Power Sequence Timing
Power supplies must adhere to the following rules:
 All power supplies of the same voltage must be powered up/down together.
 There is no power-up sequencing requirement, however all power supplies must reach operational
levels within the time periods specified in Table 5.11.
 There is no power-down sequencing or timing requirement, however the device must not be
powered for an extended period of time without all supplies at operational levels.
 Following initial power-on, or if a power supply brownout occurs (i.e., one or more supplies drops
below operational limits), a power-on reset must be executed once all power supplies reach
operational levels. Refer to Section 5.5.3, "Power-On Reset Timing," on page 89 for power-on reset
requirements.
 Do not drive input signals without power supplied to the device.
Note: Violation of these specifications may damage the device.
t_pon
All 3.3V Power
Supply Pins
All 2.5V Power
Supply Pins
All 1.2V Power
Supply Pins
Figure 5.2 Power Sequence Timing
SYMBOL
t_pon
Table 5.11 Power Sequence Timing Values
DESCRIPTION
MIN
Power supply turn on time
0
Note: The VDDVARIO power supply can be run at 2.5V or 3.3V.
Note: The magnetics power supply can be run at 2.5V or 3.3V.
TYP
MAX UNITS
25
mS
Revision 1.0 (02-06-13)
88
DATASHEET
SMSC LAN8810/LAN8810i