DJLXT905LE.C2 Cortina Systems Inc, DJLXT905LE.C2 Datasheet - Page 16

• Manufacturer Part Number: DJLXT905LE.C2
• Manufacturer: Cortina Systems Inc

Specifications of DJLXT905LE.C2

• Number Of Receivers: 1
• Data Rate: 10Mbps
• Protocols Supported: 10BASE-T
• Operating Supply Voltage (typ): 5V
• Package Type: LQFP
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (max): 5.25V
• Mounting: Surface Mount
• Pin Count: 32
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Not Compliant

LXT905 Transceiver
Datasheet
249271, Revision 5.1
5 November 2007
3.0
3.1
3.1.1
3.1.2
3.1.3
3.1.4
Table 4
Cortina Systems
Application Information
Introduction
Figure 8, Intel* Controller Application (Mode 2), on page 18
Transceiver/MC68EN360 Interface for Full Duplex 10BASE-T (Mode 1), on page 20
typical LXT905 Transceiver 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
power supply, with decoupling capacitors installed between the power and ground buses.
Either a 5 V or 3.3 V supply can power V
Termination Circuitry
The LXT905 Transceiver pulls several I/O pins up or down internally, to keep the signals
from floating. It is recommended to hard-wire 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
ground.
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 Transceiver output drivers. The LXT905
Transceiver 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
crystals before committing to a specific component.
Suitable Crystals
®
LXT905 Universal 10BASE-T Transceiver with 3.3 V Support
Manufacturer
lists some suitable crystals based on limited evaluation. Test and validate all
MTRON*
Part Number
MP-1
MP-2
CC
.
through
CC
1 and V
3.0 Application Information
Figure 10, LXT905
CC
2 use a single
CC
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