参数资料
| 型号： | XRT91L34IV |
| 厂商： | Exar Corporation |
| 文件页数： | 9/38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 |
第1页第2页第3页第4页第5页第6页第7页第8页当前第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
XRT91L34
17
REV. 1.0.1
QUAD CHANNEL MULTIRATE STS-12/3/1 AND STM-4/1/0 SONET/SDH CDR
2.4
Internal Digital Loss of Signal and External Signal Detection
XRT91L34 has an integrated Digital Loss of Signal (DLOS) circuit and supports external Signal Detection
(SDEXT) for detecting and determining received signal integrity. The internal DLOS circuit monitors the
incoming data stream. If the incoming data stream has no transition for more than 2.5
s, Loss of Signal is
declared. This LOS condition will be cleared when the circuit detects transitions in a 128
s interval sliding
window. Pulling the DLOSDIS pin signal to a high level in hardware mode or setting DLOSDIS bit in host mode
will disable the internal DLOS detection circuit to permit the framer/mapper interface to determine the Loss of
Signal declaration and clearance criteria for specific applications. The external Signal Detect function is
supported by the SDEXT input. An LVCMOS/LVTTL signal comes from the optical module through an output
usually called “SD” or “FLAG” which indicates the lack or presence of optical power. Depending on the
manufacturer of these devices, the polarity of this signal can be either active "Low" or active "High." The
SDEXT and POL inputs are Exclusive OR’ed to determine external Loss of Signal (LOS) condition. In the event
that internal DLOS is detected or an external SDEXT input indicates signal absence, the recovered serial data
output will be forced to a logic state "0," and the LOS status register is set whenever the host mode serial
microprocessor interface is active. This acts as a receive data mute upon LOS function to prevent data
chattering and to prevent random noise from being misinterpreted as valid incoming data. Figure 7 shows the
Loss of Signal Detection logic circuit. Table 4 specifies LOS declaration polarity settings.
FIGURE 7. LOSS OF SIGNAL DECLARATION CIRCUIT
TABLE 4: EXTERNAL LOS DECLARATION POLARITY SETTING
SDEXT
POL
INTERNAL SIGNAL DETECT
LOS BIT STATE
(HOST MODE ONLY)
RXDO[3:0]P/N
0
Active Low. Optical signal presence
indicated by SDEXT logic 0 input from
optical module.
Low
Normal
Operation
0
1
Active High. Optical signal presence
indicated by SDEXT logic 1 input from
optical module.
High
LOS declared
Muted
1
0
Active Low. Optical signal presence
indicated by SDEXT logic 0 input from
optical module.
High
LOS declared
Muted
1
Active High. Optical signal presence
indicated by SDEXT logic 1 input from
optical module.
Low
Normal
Operation
DLOSDIS
(Internal) DLOS Detect
(External) SDEXT
LOS Declaration
POL
and
Recovered Data Mute
相关PDF资料 |
PDF描述 |
|---|---|
| MS3110P22-21P | CONN RCPT 21POS WALL MNT W/PINS |
| M83723/78W1005N | CONN PLUG 5POS STRAIGHT W/PINS |
| M83723/78R1005N | CONN PLUG 5POS STRAIGHT W/PINS |
| VE-JW0-MW-B1 | CONVERTER MOD DC/DC 5V 100W |
| VE-J1V-MW-B1 | CONVERTER MOD DC/DC 5.8V 100W |
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 |
发布紧急采购，3分钟左右您将得到回复。