参数资料
| 型号： | XRT7300IVTR |
| 厂商： | Exar Corporation |
| 文件页数： | 39/55页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 SGL 44TQFP |
| 标准包装： | 1,000 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 1/1 |
| 规程： | DS3，E3，STS-1 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LQFP |
| 供应商设备封装： | 44-TQFP（10x10） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页当前第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
40
4.4
TXOFF FEATURES
The XRT7300 allows the Transmit Driver in the
Transmit Section of the chip to be shut off. This fea-
ture can be advantageous for system redundancy
conditions or during diagnostic testing. This feature
can be activated by either of the following ways.
When the XRT7300 is operating in the Hardware
Mode
Shut off the Transmit Driver by toggling the TXOFF
input pin (pin 35) “High”. Turn on the Transmit Driver
by toggling the TXOFF input pin “Low”.
When the XRT7300 is operating in the HOST
Mode
If the XRT7300 is operating in the HOST Mode, the
TXOFF input pin is disabled. Consequently, the-
Transmit Driver is turned off by writing to Command
Register CR1 and setting the TXOFF bit-field (bit D4)
to “1”.
NOTE: If the Transmitter is shut off via the TXOFF feature,
the XRT7300 can NOT be configured to operate in the Ana-
log Local Loop-Back Mode. To perform diagnostics on the
chip and still invoke the TXOFF feature as in System
Redundancy Applications, use the Digital Local Loop-Back
feature instead.
4.5
THE TRANSMIT DRIVE MONITOR FEATURES
The Transmit Drive Monitor feature performs monitor-
ing of the line in the Transmit Direction for the occur-
rence of fault conditions such as a short circuit on the
line or a defective Transmit Drive in the XRT7300.
The Transmit Drive Monitor is activated by connect-
ing the MTIP pin (pin 44) to the TTIP line through a
270
resistor connected in series and by connecting
the MRING pin (pin 43) to the TRING line through a
270
resistor connected in series, as illustrated in
When the Transmit Drive Monitor circuitry is connect-
ed to the line as illustrated in Figure 26, then it moni-
tors the line for transitions. As long as the Transmit
Drive Monitor circuitry detects transitions on the line
via the MTIP and MRING pins, it keeps the DMO
(Drive Monitor Output) signal “Low”. However, if the
Transmit Drive Monitor circuit detects no transitions
on the line for 128±32 TCLK periods, then the DMO
signal toggles “High”.
NOTES:
1. The Transmit Drive Monitor circuit does not have to
be used to operate the Transmit Section of the
XRT7300. This is purely a diagnostic feature.
COMMAND REGISTER CR1 (ADDRESS = 0X01)
D4
D3
D2
D1
D0
TXOFF
TAOS
TXCLKINV
TXLEV
TXBIN
1
X
FIGURE 31. THE XRT7300 EMPLOYING THE TRANSMIT DRIVE MONITOR FEATURES
R1 = 36
R2 = 36
TTIP
TRING
1:1
MTIP
MRING
R3 = 270
R4 = 270
T1
R5 = 75
相关PDF资料 |
PDF描述 |
|---|---|
| MS3101E28-18SW | CONN RCPT 12POS FREE HNG W/SCKT |
| XRT73L02MIVTR-F | IC LIU E3/DS3/STS-1 2CH 100TQFP |
| MS27508E14B5SD | CONN RCPT 5POS BOX MNT W/SCKT |
| MS3100R22-15S | CONN RCPT 6POS WALL MNT W/SCKT |
| MS27467E15F97P | CONN PLUG 12POS STRAIGHT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT7300IVTR-F | 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 |
| XRT7302IV | 制造商:未知厂家 制造商全称:未知厂家 功能描述:PCM Transceiver |
| XRT73L00 | 制造商:EXAR 制造商全称:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00A | 制造商:EXAR 制造商全称:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00AES | 功能描述:界面开发工具 Eval System for XRT73L00A Series RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
发布紧急采购，3分钟左右您将得到回复。