lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 28

• Manufacturer Part Number: lan8720
• Description: Small Footprint Rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Revision 1.0 (04-15-09)
accepting 50MHz
REF_CLK
Capable of
MAC
clock
nINT not available in this
configuration
In some system architectures, a 25MHz clock source is available. The LAN8720 can be used to
generate the REF_CLK to the MAC as shown in
Interface
RMII
Figure 4.5 LAN8720 sources REF_CLK from a 25MHz crystal
2
2
2
MDIO
MDC
TXD[1:0]
TXEN
RXD[1:0]
CRS_DV
RXER
REFCLKO
LED[2:1]
nRST
DATASHEET
10/100 PHY
LAN8720
24-QFN
RMII
28
Figure
XTAL1/CLKIN
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
XTAL2
4.6. It is important to note that in this specific
RXN
RXP
TXP
TXN
Mag
25MHz
SMSC LAN8720/LAN8720i
RJ45
Datasheet