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UCC5610DWPTR PDF预览

UCC5610DWPTR

更新时间： 2024-11-20 02:58:35
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德州仪器 - TI /
页数 文件大小 规格书
8页 265K
描述
18-LINE 3-5 VOLT LOW CAPACITANCE SCSI ACTIVE TERMINATOR

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UCC5610DWPTR 数据手册

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SLUS362A – FEBRUARY 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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0.5-µA Supply Current in Disconnect Mode  
110-Ω/2.5-kΩ Programmable Termination  
Completely Meets SCSI Hot Plugging  
Current Limit and Thermal Shutdown  
Protection  
description  
The UCC5610 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.  
The UCC5610 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 0.5 µA, which makes the IC attractive for battery powered systems.  
The UCC5610 is designed with an ultralow-channel capacitance of 1.8 pF, which eliminates effects on signal  
integrity from disconnected terminators at interim points on the bus.  
The UCC5610 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  
low, and disconnected when driven high. 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 low, and disconnected  
when driven high.  
block diagram  
3
UDG-94128-1  
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  
12345678

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UCC5610DWPTR 替代型号

型号 品牌 替代类型 描述 数据表
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