LAN8720AI datasheet(78/79 Pages) SMSC

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

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8720A/LAN8720Ai

DATASHEET

Chapter 7 Datasheet Revision History

Table 7.1 Customer Revision History

REVISION LEVEL & DATE

SECTION/FIGURE/ENTRY

CORRECTION

Rev. 1.4

(08-23-12)

Section 4.2.2, "Basic Status

Updated definitions of bits 10:8.

Section 4.2.11, "Special

Control/Status Indications

Updated bit 11 definition.

Rev. 1.3

(03-12-12)

Company disclaimer on

page 2

Removed company address and phone numbers.

Rev. 1.3

(04-20-11)

Table 5.9, “RMII Timing

Values (REF_CLK Out

Mode),” on page 71

Updated toval maximum value from 10.0ns to

5.0ns.

Table 2.7, “Power Pins,” on

page 14

Updated VDDCR pin note to include requirement

of 1uF and 470pF decoupling capacitors in parallel

to ground on the VDDCR pin.

Figure 3.16 Power Supply

Diagram (1.2V Supplied by

Internal Regulator) on

page 43 and Figure 3.16

Power Supply Diagram

(1.2V Supplied by Internal

Regulator) on page 43

Updated diagrams to include 1uF and 470pF

decoupling capacitors on the VDDCR pin.

Rev. 1.2 (11-10-10)

Section 5.5.4, "RMII

Interface Timing," on

page 71

Updated diagrams and tables to include RXER.

Section 3.7.4.2, "REF_CLK

Out Mode," on page 34

Added timing note in Section 3.7.4.2, "REF_CLK

Out Mode"

Section 5.5.4, "RMII

Interface Timing," on

page 71

Corrected signal names on RMII timing diagrams

and tables. Updated Table 5.9 toval, tohold, tsu, and

tihold with 10 ns, 1.4 ns, 7.0 ns, and 2.0 ns,

respectively.

Table 5.8, “Power-On nRST

& Configuration Strap

Timing Values,” on page 70

Updated todad description: “Output drive after

nRST deassertion”

Rev. 1.1 (04-09-10)

Section 5.1, "Absolute

Maximum Ratings*"

Modified “HBM ESD Performance by adding “per

JEDEC JESD22-A114” and changed “+/-5kV” to

“Class 3A”

Section 5.3, "Power

Consumption," on page 64

Corrected typo in the current consumption table

row title: “100BASE-TX /W TRAFFIC”

Section 5.3, "Power

Consumption," on page 64

Corrected typo in note regarding Ethernet

component current:

“The Ethernet component current is typically 41mA

in 100BASE-TX mode and 100mA in 10BASE-T

mode, independent of the 2.5V or 3.3V supply rail

of the transformer.”

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