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UCC5611QP

更新时间： 2024-11-07 23:39:07
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Terminator

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UCC5611QP 数据手册

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SLUS348A – MARCH 1997 – REVISED NOVEMBER 2000  
D
Complies with SPI-2 and SPI-3 Standards  
2.75-V to 7-V Operation  
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–650-mA Sourcing Current for Termination  
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+400-mA Sinking Current for Active  
Negation Drivers  
1.8-pF Channel Capacitance during  
Disconnect  
Trimmed Termination Current to 4%  
Trimmed Impedance to 7%  
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1-µA Supply Current in Disconnect Mode  
110-Ω/2.5-k Programmable Termination  
Completely Meets SCSI Hot Plugging  
Current Limit and Thermal Shutdown  
Protection  
description  
The UCC5611 provides 18 lines of active termination for a SCSI (Small Computer Systems Interface) parallel  
bus. The SCSI standard recommends active termination at both ends of the cable segment.  
The UCC5611 is ideal for high performance 3.3-V SCSI systems. The key features contributing to such  
low-operating voltage are the 0.1-V drop-out regulator and the 2.75-V reference. During disconnect the supply  
current is typically only 1 µA, which makes the IC attractive for battery powered systems.  
The UCC5611 is designed with an ultra-low channel capacitance of 1.8 pF, which eliminates effects on signal  
integrity from disconnected terminators at interim points on the bus.  
The UCC5611 can be programmed for either a 110-Ω or 2.5-kΩ termination. The 110-Ω termination is used for  
standard SCSI bus lengths and the 2.5-kΩ termination is typically used in short bus applications. When driving  
the TTL compatible DISCNCT pin directly, the 110-Ω termination is connected when the DISCNCT pin is driven  
high, and disconnected when low. When the DISCNCT pin is driven through an impedance between 80 kΩ and  
150 kΩ, the 2.5-kΩ termination is connected when the DISCNCT pin is driven high, and disconnected when  
driven low.  
block diagram  
UDG-94131-1  
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  
12345

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