LAN8720AI datasheet(69/79 Pages) SMSC

Part #	LAN8720AI

Description	Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

PDF	79 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

SMSC LAN8720A/LAN8720Ai

Revision 1.4 (08-23-12)

DATASHEET

5.5.2

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 tpon. Device power supplies can turn off in any order provided they all reach

0 volts within the specified time period poff.

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 3.7.3,

"REGOFF: Internal +1.2V Regulator Configuration," on page 32.

Figure 5.2 Power Sequence Timing

Table 5.7 Power Sequence Timing Values

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNITS

tpon

Power supply turn on time

tpoff

Power supply turn off time

500

VDDIO

Magnetics

Power

tpon

tpoff

VDD1A,

VDD2A

LAN8720AI Datasheet(PDF) 69 Page - SMSC Corporation