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UCC5619MWP PDF预览

UCC5619MWP

更新时间: 2024-11-22 23:39:07
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4页 124K
描述
Terminator

UCC5619MWP 数据手册

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UCC5619  
27-Line SCSI Terminator With Reverse Disconnect  
FEATURES  
DESCRIPTION  
Complies with SCSI, SCSI-2, SCSI-3, UCC5619 provides 27 lines of active termination for a SCSI (Small Com-  
SPI and FAST-20 (Ultra) Standards  
puter Systems Interface) parallel bus. The SCSI standard recommends ac-  
tive termination at both ends of the cable.  
2.5pF Channel Capacitance during  
Disconnect  
The UCC5619 is ideal for high performance 5V SCSI systems. During dis-  
connect the supply current is typically only 100µA, which makes the IC at-  
tractive for lower powered systems.  
100µA Supply Current in Disconnect  
Mode  
The UCC5619 is designed with a low channel capacitance of 2.5pF, which  
eliminates effects on signal integrity from disconnected terminators at in-  
terim points on the bus.  
4V To 7V Operation  
110 Termination  
The power amplifier output stage allows the UCC5619 to source full termi-  
nation current and sink active negation current when all termination lines  
are actively negated.  
Completely Meets SCSI Hot Plugging  
–900mA Sourcing Current for  
Termination  
The UCC5619, as with all Unitrode terminators, is completely hot pluggable  
and appears as high impedance at the teminating channels with VTRMPWR  
= 0V or open.  
+500mA Sinking Current for Active  
Negation  
Logic Command Disconnects all  
Termination Lines  
Internal circuit trimming is utilized, first to trim the 110impedance, and  
then most importantly, to trim the output current as close to the maximum  
SCSI-3 specification as possible, which maximizes noise margin in fast  
SCSI operation.  
Trimmed Impedance to 5%  
Current Limit and Thermal Shutdown  
Other features include thermal shutdown and current limit. This device is  
offered in low thermal resistance versions of the industry standard 36 pin  
wide body QSSOP (MWP) and 48 pin LQFP (FQP).  
Protection  
Consult SSOP-36 (MWP QSSOP-36) and FQP-48 Packaging Diagram for  
exact dimensions.  
BLOCK DIAGRAM  
UDG-96108  
Circuit Design Patented  
10/98  
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