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参数资料
| 型号： | WJLXT905LE.C2 |
| 厂商： | INTEL CORP |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP32 |
| 封装： | ROHS COMPLIANT, MO-136BC, LQFP-32 |
| 文件页数： | 10/40页 |
| 文件大小： | 544K |
| 代理商： | WJLXT905LE.C2 |
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LXT905 Universal 10BASE-T Transceiver with 3.3V Support
18
Datasheet
Document Number: 249271
Revision Number: 004
Revision Date: 19-Oct-2005
3.0
Application Information
3.1
Introduction
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. VCC1 and VCC2 use a single power
supply, with decoupling capacitors installed between the power and ground buses. Either a 5 V or
3.3 V supply can power Vcc.
3.1.1
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 VCC or ground.
3.1.2
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.
3.1.3
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.
3.1.4
Crystal Information
Table 4 lists some suitable crystals based on limited evaluation. Test and validate all crystals before
committing to a specific component.
Table 4.
Suitable Crystals
Manufacturer
Part Number
MTRON
MP-1
MP-2
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