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SN75LVDS050DG4 参数 Datasheet PDF下载

SN75LVDS050DG4图片预览
型号: SN75LVDS050DG4
PDF下载: 下载PDF文件 查看货源
内容描述: 高速差分线路驱动器和接收 [HIGH-SPEED DIFFERENTIAL LINE DRIVERS AND RECEIVERS]
分类和应用: 线路驱动器或接收器驱动程序和接口接口集成电路光电二极管
文件页数/大小: 20 页 / 309 K
品牌: TI [ TEXAS INSTRUMENTS ]
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SN75LVDS179, SN75LVDS180, SN75LVDS050, SN75LVDS051  
HIGH-SPEED DIFFERENTIAL LINE DRIVERS AND RECEIVERS  
SLLS361A – JUNE 1999 – REVISED MARCH 2000  
APPLICATION INFORMATION  
fail safe  
One of the most common problems with differential signaling applications is how the system responds when  
no differential voltage is present on the signal pair. The LVDS receiver is like most differential line receivers, in  
that its output logic state can be indeterminate when the differential input voltage is between –100 mV and  
100 mV and within its recommended input common-mode voltage range. TI’s LVDS receiver is different in how  
it handles the open-input circuit situation, however.  
Open-circuit means that there is little or no input current to the receiver from the data line itself. This could be  
when the driver is in a high-impedance state or the cable is disconnected. When this occurs, the LVDS receiver  
will pull each line of the signal pair to near V  
through 300-kresistors as shown in Figure 14. The fail-safe  
CC  
feature uses an AND gate with input voltage thresholds at about 2.3 V to detect this condition and force the  
output to a high-level regardless of the differential input voltage.  
V
CC  
300 kΩ  
300 kΩ  
A
R
t
100 Typ  
Y
B
V
IT  
2.3 V  
Figure 14. Open-Circuit Fail Safe of the LVDS Receiver  
It is only under these conditions that the output of the receiver will be valid with less than a 100-mV differential  
input voltage magnitude. The presence of the termination resistor, Rt, does not affect the fail-safe function as  
long as it is connected as shown in the figure. Other termination circuits may allow a dc current to ground that  
could defeat the pullup currents from the receiver and the fail-safe feature.  
16  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265