DJLXT905LC.C2 831645 Intel, DJLXT905LC.C2 831645 Datasheet - Page 18

• Manufacturer Part Number: DJLXT905LC.C2 831645
• Manufacturer: Intel

Specifications of DJLXT905LC.C2 831645

• Lead Free Status / RoHS Status: Not Compliant

LXT905 Universal 10BASE-T Transceiver with 3.3V Support
3.0
3.1
3.1.1
3.1.2
3.1.3
3.1.4
18
Table 4.
Application Information
Introduction
Figure 8 “Intel
PHY/Motorola* MC68EN360 Interface for Full-Duplex 10BASE-T (Mode 1)” on page 22
typical LXT905 applications. These diagrams group similar pins; they do not portray the actual
chip pinout. The controller interface pins [Transmit Data (TXD), Transmit Clock (TCLK) Transmit
Enable (TEN), Receive Data (RXD), Receive Clock (RCLK), Collision Signal (COL), and Carrier
Detect (CD)] are at the upper left of the diagram.
Power and ground pins are at the bottom of each diagram. V
supply, with decoupling capacitors installed between the power and ground buses. Either a 5 V or
3.3 V supply can power Vcc.
Termination Circuitry
The LXT905 pulls several I/O pins up or down internally, to keep the signals from floating. Intel
recommends hard-wiring these pins either High or Low. Externally pull-up pins (LEDT/PDN,
LEDC/FDE, LEDR, LEDL) and pull-down pins (LBK, TEN, TXD, DSQE, MDO, MDI)
separately, using a 10 k Ω, 1% resistor, or tie them directly to V
Twisted-Pair Interface
The Twisted-Pair interface (TPOP/N and TPIP/N) is at the upper right of the diagram. The I/O
pairs have impedance-matching resistors for 100 Ω UTP, but do not require any external filters.
RBIAS Pin
The RBIAS pin sets the levels for the LXT905 output drivers. The LXT905 requires a 7.5 k Ω, 1%
resistor directly connected between the RBIAS pin and ground. Locate this resistor as close to the
device as possible. Keep the traces as short as possible, isolated from all other high-speed signals.
Crystal Information
Table 4
committing to a specific component.
Suitable Crystals
lists some suitable crystals based on limited evaluation. Test and validate all crystals before
Manufacturer
MTRON
®
Controller Application (Mode 2)” on page 20
Part Number
MP-1
MP-2
CC
through
1 and V
CC
or ground.
CC
Figure 10 “Intel
2 use a single power
Revision Date: 19-Oct-2005
Document Number: 249271
Revision Number: 004
Datasheet
®
LXT905
show