参数资料
| 型号： | XRT73LC03AIV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 48/61页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 3CH 120LQFP |
| 标准包装： | 72 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 3/3 |
| 规程： | DS3，E3，STS-1 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 120-LQFP |
| 供应商设备封装： | 120-LQFP（14x20） |
| 包装： | 托盘 |
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XRT73LC03A
50
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.4
4.4
TXOFF FEATURES
The Transmit Section of each Channel in the
XRT73LC03A can be shut off. When this feature is
invoked, the Transmit Section of the configured chan-
nel is shut-off and the Transmit Output signals (e.g.,
TTIP_(n) and TRing_(n)) is tri-stated. This feature is
useful for system redundancy conditions or during di-
agnostic testing.
a. Operating in the Hardware Mode
Shut off the Transmit Driver concurrently within all
Channels by toggling the TxOFF input pin “High".
Turn on the Transmit Driver by toggling the TxOFF in-
put pin “Low".
b. Operating in the HOST Mode
Turn off the Transmit Driver within Channel(n) by set-
ting the TxOFF_(n) bit-field within Command Register
CR1-(n) to "1".
Writing a "0" into this bit-field enables the Chan-
nel(n)Transmit Driver.
NOTE: In order to permit a system designed for redundancy
to quickly shut-off a defective line card and turn-on the
back-up line card, the XRT73LC03A was designed such
that either Transmitter can quickly be turned-on or turned-
off by toggling the TxOFF input pins. This approach is
much quicker then setting the TxOFF_(n) bit-fields via the
Microprocessor Serial Interface.
Table 6 presents a Truth Table which relates the set-
ting of the TxOFF external pin and bit-field for a chan-
nel to the state of the Transmitter. This table applies
to all Channels of the XRT73LC03A.
To control the state of all transmitters via the Micro-
processor Serial interface, connect the TxOFF input
pin to GND.
4.5
THE TRANSMIT DRIVE MONITOR FEATURES
The Transmit Drive Monitor is used to monitor the line
in the Transmit Direction for the occurrence of fault
conditions such as a short circuit on the line, a defec-
tive Transmit Drive in the XRT73LC03A or another
LIU.
Activate the Channel(n) Transmit Drive Monitor by
connecting the MTIP_(n) pin to the TTIP_(n) line
through a 270 Ohm resistor connected in series, and
connecting the MRing_(n) pin to the TRing_(n) line
through a 270 Ohm resistor connected in series.
Such an approach is illustrated in Figure 36.
COMMAND REGISTER CR1-(n)
D4
D3
D2
D1
D0
TxOFF_(n) TAOS_(n
)
TxClkINV_(n) TxLEV_(n) TxBIN_(n)
1X
X
TABLE 6: THE RELATIONSHIP BETWEEN THE TXOFF INPUT PIN, THE TXOFF BIT FIELD AND THE STATE OF THE
TRANSMITTER
STATE OF THE TXOFF
INPUT PIN
STATE OF THE TXOFF
BIT FIELD
STATE OF THE TRANSMITTER
LOW
0
ON (Transmitter is Active)
LOW
1
OFF (Transmitter is Tri-Stated)
HIGH
0
OFF (Transmitter is Tri-Stated)
HIGH
1
OFF (Transmitter is Tri-Stated)
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相关代理商/技术参数 |
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| XRT73LC04A | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73LC04A_08 | 制造商:EXAR 制造商全称:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73LC04AES | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| XRT73LC04AIV | 功能描述:外围驱动器与原件 - PCI RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
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