收藏本站

Design Guidelines for TERIDIAN 78P235x LIUs
ANALOG SIGNAL TRACES AND TERMINATIONS
The 78P235x LIUs have differential drivers and receivers. To maintain signal integrity and optimal performance,
all differential traces should be of equal length, parallel to each other, and as short as possible. The impedance of
such traces and terminations should also be well controlled.
For the Reset pin (PORB) , do not tie directly to VCC as this will prevent internal power-on reset. Connect to a
microcontroller for manual reset or de-couple to ground using a 1nF capacitor.
Each LVPECL interface should have a differential trace impedance of 100 ? to the SerDes. For best return loss,
the input termination resistors should be placed within one inch of their 78P235x input pins. LVPECL output
drivers require an external pull-down resistor, which should also be placed near the output pin. See Figure 2 and
Figure 3 for diagrams of recommended terminations of LVPECL I/Os.
NOTES :
1. For DC-coupling, the common mode or bias voltage levels of both ICs must be compatible. Reference product
specifications for more information on bias levels or AC-couple.
2. For E4 applications, DC coupling is required due to the unframed nature of AIS (all ones) signaling in E4.
LVPECL Output (PO)
VCC
from circuit
20
< 20"
< 1"
VCC
Reff
170
50 ohm
to LVPECL
input
from circuit
20
235x IC
PCB
170
50 ohm
< 1"
Figure 2: LVPECL Outputs
LVPECL Input (PI)
3.3V
< 1"
from
transmitting
chip
50 ohm
100
to gates
from
transmitting
chip
50 ohm
82
82
50 ohm
50 ohm
< 1"
to gates
170
170
PCB
235x IC
PCB
235x IC
Figure 3: LVPECL Inputs (DC-coupled and 0.1uF AC-coupled options)
Page 3 of 15
? 2008 Teridian Semiconductor Corp.
Rev 2.1
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
79-WHITE-1"X60YD TAPE GLASS CLOTH 1"X 60YD WHT
79059-2701 CONN RECEPT R/A 50POS 4-40 SCSI
79059-2702 CONN RECEPT R/A 68POS 4-40 SCSI
79059-2726 CONN RECEPT R/A 50POS 2-56 SCSI
79278 TAPE CLR ESD YEL STRIPE 2"X72YDS
796014-2 CONN CHAMP GUIDE PIN .050
796055-2 CONN RCPT 68POS .8MM R/A
796068-1 CONN RCPT 40POS .050 VERT
相关代理商/技术参数
78P2351R-IM 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Serial 155M NRZ to CMI Converter
78P2351R-IM/F 功能描述:接口 - 专用 Serial 155M NRZ to CMI Converter RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59
78P2351R-IMR 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Serial 155M NRZ to CMI Converter
78P2351R-IMR/F 功能描述:接口 - 专用 Serial 155M NRZ to CMI Converter RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59
78P2352 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Dual Channel OC-3/ STM1-E/ E4 LIU
78P2352-DB/CMI 功能描述:BOARD DEMO 78P2352 COAX CABLE RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板
78P2352-DB-CMI 功能描述:界面开发工具 78P2352 Demo Brd For Coax Cable 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
78P2352-IEL 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Dual Channel OC-3/ STM1-E/ E4 LIU