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UC5603N

更新时间: 2024-09-19 23:38:59
品牌 Logo 应用领域
其他 - ETC 接口集成电路光电二极管
页数 文件大小 规格书
6页 195K
描述
Terminator

UC5603N 数据手册

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U C5 60 3  
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SLUS195A – MARCH 1997 – REVISED OCTOBER 2000  
D
Complies with SCSI, SCSI–2 and SPI–2  
Standards  
D
Logic Command Disconnects all  
Termination Lines  
D
6-pF Channel Capacitance during  
Disconnect  
D
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Trimmed Termination Current to 3%  
Trimmed Impedance to 3%  
D
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100-µA Supply Current in Disconnect Mode  
Meets SCSI Hot Plugging  
Negative Clamping on all Signal Lines  
Current Limit and Thermal Shutdown  
Protection  
–400-mA Sourcing Current for Termination  
+400-mA Sinking Current for Active  
Negation Drivers  
description  
The UC5603 provides 9 lines of active termination for a SCSI (Small Computers Systems Interface) parallel bus.  
The SCSI standard recommends active termination at both ends of the cable segment.  
The UC5603 provides a disconnect feature which, when opened or driven high, will disconnect all terminating  
resistors, and disables the regulator; greatly reducing standby power. The output channels remain high  
impedance even without Termpwr applied. A low channel capacitance of 6 pF allows units at interim points of  
the bus to have little to no effect on the signal integrity.  
Functionally the UC5603 is similar to its predecessor, the UC5601 – 18 line Active Terminator. Several electrical  
enhancements were incorporated in the UC5603, such as a sink/source regulator output stage to accommodate  
all signal lines at 5 V, while the regulator remains at its nominal value, reduced channel capacitance to 6 pF  
typical, and as with the UC5601, custom power packages are utilized to allow normal operation at full power  
conditions (1.2 watts).  
functional block diagram  
UDG-94049  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2000, Texas Instruments Incorporated  
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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