LAN8740A Datasheet, PDF (5/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

LAN8740A/LAN8740Ai
The LAN8740A/LAN8740Ai is available in commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature
range versions. A typical system application is shown in Figure 1-1. Figure 1-2 provides an internal block diagram of the
device.
FIGURE 1-1:
SYSTEM BLOCK DIAGRAM
10/100
Ethernet
MAC
MII/
RMII
Mode
LAN8740A/
LAN8740Ai
MDI _Transformer
LED
RJ45
Crystal or
Clock
Oscillator
FIGURE 1-2:
ARCHITECTURAL OVERVIEW
MODE[0:2]
nRST
RMIISEL
TXD[0:3]
TXEN
TXER
TXCLK
RXD[0:3]
RXDV
RXER
RXCLK
CRS
COL/CRS_DV
MDC
MDIO
Mode Control
Reset Control
Auto-
Negotiation
SMI Management
Control
100M RX
Logic
WoL
10M RX
Logic
100M TX
Logic
100M
Transmitter
Transmitter
10M TX
Logic
10M
Transmitter
DSP System:
Clock
Data Recovery
Equalizer
Receiver
10M PLL
Analog-to-
Digital
100M PLL
Squeltch
& Filters
LAN8740A/LAN8740Ai
HP Auto-MDIX
TXP/TXN
RXP/RXN
MDIX
Control
PLL
Interrupt
Generator
LEDs
XTAL1/CLKIN
XTAL2
nINT
LED1
LED2
Central Bias
RBIAS
PHY Address
Latches
PHYAD[0:2]
 2013-2015 Microchip Technology Inc.
DS00001987A-page 5