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UC5608 PDF预览

UC5608

更新时间: 2024-11-22 22:17:51
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
4页 232K
描述
18-Line Low Capacitance SCSI Active Terminator

UC5608 数据手册

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UC5608  
18-Line Low Capacitance SCSI Active Terminator  
FEATURES  
DESCRIPTION  
Complies with SCSI, SCSI-2 and SPI-2  
Standards  
The UC5608 provides 18 lines of active termination for a SCSI (Small  
Computer Systems Interface) parallel bus. The SCSI standard recom-  
mends active termination at both ends of the bus cable.  
6pF Channel Capacitance during  
Disconnect  
The UC5608 is pin-for-pin compatible with its predecessors, the  
UC5601 and UC5602 - 18 Line Active Terminator. Parametrically the  
UC5608 has a 5% tolerance on impedance and current compared to a  
3% tolerance on the UC5601 and the sink current is increased from  
20 to 200mA. The low side clamps have been removed. Custom  
power packages are utilized to allow normal operation at full power  
conditions (2 Watts).  
100µA Supply Current in Disconnect  
Mode  
Meets SCSI Hot Plugging Capability  
650mA Sourcing Current for  
Termination  
When in disconnect mode the terminator will disconnect all terminat-  
ing resistors and disable the regulator, greatly reducing standby  
power. The output channels remain high impedance even without  
Termpwr applied.  
+200mA Sinking Current for Active  
Negation  
Provides Active Termination for 18 Lines  
Internal circuit trimming is utilized to trim the impedance to a 5% toler-  
ance and, most importantly, to trim the output current to a 5% toler-  
ance, as close to the max SCSI spec as possible, which maximizes  
noise margin in fast SCSI operation.  
Logic Command Disconnects all  
Termination Lines  
Trimmed Termination Current to 5%  
Trimmed Impedance to 5%  
Other features include 4.0 to 5.25V Termpwr, thermal shutdown and  
current limit.  
Current Limit and Thermal Shutdown  
Protection  
This device is offered in low thermal resistance versions of the indus-  
try standard 28 pin wide body SOIC, 28 pin wide body TSSOP, and 28  
pin PLCC, as well as 24 pin DIP.  
BLOCK DIAGRAM  
UDG-94047  
Circuit Design Patented  
3/97  

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