LAN8710A Datasheet, PDF (71/82 Pages) SMSC Corporation – Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR Technology

5.5.2
Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR^® Technology
Datasheet
Power Sequence Timing
This diagram illustrates the device power sequencing requirements. The VDDIO, VDD1A, VDD2A and
magnetics 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 p_off.
VDDIO
Magnetics
Power
VDD1A,
VDD2A
t_pon
t_poff
Figure 5.2 Power Sequence Timing
Table 5.6 Power Sequence Timing Values
SYMBOL
DESCRIPTION
MIN
t_pon
Power supply turn on time
t_poff
Power supply turn off time
TYP MAX UNITS
50
mS
500
mS
Note: When the internal regulator is disabled, a power-up sequencing relationship exists between
VDDCR and the 3.3V power supply. For additional information refer to Section 3.7.4,
"REGOFF: Internal +1.2V Regulator Configuration," on page 38.
SMSC LAN8710A/LAN8710Ai
71
DATASHEET
Revision 1.4 (08-23-12)