参数资料
| 型号： | XRT91L34IV |
| 厂商： | Exar Corporation |
| 文件页数： | 7/38页 |
| 文件大小： | 0K |
| 描述： | IC MULTIRATE CDR QUAD 128LQFP |
| 标准包装： | 72 |
| 类型： | 时钟和数据恢复（CDR），扇出缓冲器（分配），多路复用器 |
| PLL： | 是 |
| 主要目的： | SONET/SDH，STS，STM |
| 输入： | LVDS，LVPECL |
| 输出： | LVDS，LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:2 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 622.08MHz |
| 电源电压： | 1.71 V ~ 3.465 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-LQFP |
| 供应商设备封装： | 128-LQFP（14x14） |
| 包装： | 托盘 |
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XRT91L34
15
REV. 1.0.1
QUAD CHANNEL MULTIRATE STS-12/3/1 AND STM-4/1/0 SONET/SDH CDR
The receive serial inputs can also be AC coupled to an optical module or an electrical interface. A simplified
Differential LVPECL AC coupling using external passive components block diagram is shown in Figure 5.
NOTE: Some optical modules integrate AC coupling capacitors and DC current path resistors internally within the module.
2.2
Receive Clock and Data Recovery
The clock and data recovery (CDR) unit accepts the high speed NRZ serial data from the Differential receiver
and generates a clock that is the same frequency as the incoming data. The clock recovery block utilizes the
reference clock from REFCLKP/N or TTLREFCLK to train and monitor its clock recovery PLL. Upon startup,
the PLL locks to the local reference clock. Once this is achieved, the PLL then attempts to lock onto the
incoming receive serial data stream. Whenever the recovered clock frequency deviates from the local
reference clock frequency by more than approximately ±500 ppm, the clock recovery PLL will switch to the
local reference clock, declare a Loss of Lock and output a high level signal on the LOL output pin. Whenever a
Loss of Lock (LOL) or a Loss of Signal (LOS) event occurs, the CDR will continue to supply a receive clock
(based on the local reference). When the SDEXT becomes active and internal DLOS is cleared and the
recovered clock is determined to be within ±500 ppm accuracy with respect to the local reference source, the
clock recovery PLL will switch back to the incoming receive serial data stream. Table 3 specifies the Clock and
Data Recovery Unit performance characteristics.
FIGURE 5. RECEIVE SERIAL INPUT INTERFACE USING DIFF LVPECL AC COUPLING INTERNAL TERMINATION
Optical Module
RXDI0P
RXDI0N
Optical Fiber
Install DC current path resistors
as close to Optical Module
LVPECL output driver pins
XRT91L34
STS-12/3/1
or
STM-4/1/0
Clock and Data
Recovery
RXDI1P
RXDI1N
RXDI2P
RXDI2N
RXDI3P
RXDI3N
Optical Module
Optical Fiber
Optical Module
Optical Fiber
Optical Module
Optical Fiber
Channel 0
Channel 1
Channel 2
Channel 3
DIFF LVPECL A/C Coupling using
External Passive Components
130 x 8
100
VBB1.2
Internal 100 Ohm line-to-line
termination active on
RXDI[3:0]P and RXDI[3:0]N pins
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT91L34IVF | 制造商:Exar Corporation 功能描述:CDR 51.84Mbps/155.52Mbps/622.08Mbps SONET/SDH 128-Pin LQFP 制造商:EXAR 功能描述:CDR 51.84Mbps/155.52Mbps/622.08Mbps SONET/SDH 128-Pin LQFP |
| XRT91L34IV-F | 功能描述:网络控制器与处理器 IC 8-Bit TTL 1.8V temp -45 to 85C;UART 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 |
| XRT91L34IVTR | 功能描述:网络控制器与处理器 IC 4 CH OC-12/STM4 OC-3/STM1 CDR 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 |
| XRT91L34IVTR-F | 功能描述:网络控制器与处理器 IC 4 CH OC-12/STM4 OC-3/STM1 CDR 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 |
| XRT91L80 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER |
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