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參數(shù)資料
| 型號： | UCC5621 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | 27 - Line SCSI Terminator With Split Reverse Disconnect(27線多模式小型計算機接口終端匹配器) |
| 中文描述： | 27 -線SCSI端接配劈開反向斷開（27線多模式小型計算機接口終端匹配器） |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 287K |
| 代理商： | UCC5621 |
UCC5621
DESCRIPTION
UCC5621 provides 27 lines of active termination for a SCSI (Small Com-
puter Systems Interface) parallel bus. The SCSI standard recommends ac-
tive termination at both ends of the cable.
The UCC5621 is ideal for high performance 5V SCSI systems. During dis-
connect the supply current is typically only 100
μ
A, which makes the IC at-
tractive for lower powered systems.
The UCC5621 features a split reverse disconnect allowing the user to con-
trol termination lines 10 to 27 with disconnect one, DISCNCT1, and control
terminiation lines 1 to 9 with disconnect two, DISCNCT2.
The UCC5621 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.
The power amplifier output stage allows the UCC5621 to source full termi-
nation current and sink active negation current when all termination lines
are actively negated.
The UCC5621, as with all Unitrode terminators, is completely hot plugga-
ble and appears as high impedance at the teminating channels with
V
TRMPWR
= 0V or open.
Internal circuit trimming is utilized, first to trim the 110
impedance, 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-
20 SCSI operation.
(continued)
27 - Line SCSI Terminator With Split Reverse Disconnect
BLOCK DIAGRAM
FEATURES
Complies with SCSI, SCSI-2, SCSI-3,
SPI and FAST-20 (Ultra) Standards
2.5pF Channel Capacitance During
Disconnect
100
μ
A Supply Current in Disconnect
Mode
4V To 7V Operation
110
Termination
Completely Meets SCSI Hot Plugging
–900mA Sourcing Current for
Termination
+500mA Sinking Current for Active
Negation
Logic Command Disconnects all
Termination Lines
Split Reverse Controls Lines 1 to 9
and 10 to 27 Separately
Trimmed Impedance to 5%
Current Limit and Thermal Shutdown
Protection
10/98
UDG-96111
Circuit Design Patented
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| UCC5622 | 27 - Line SCSI Terminator With Split Disconnect(27線多模式小型計算機接口終端匹配器) |
| UCC5628 | Multimode SCSI 14 Line Terminator(14線多模式小型計算機接口終端匹配器) |
| UCC5629 | Multimode SCSI 14 Line Terminator(多模式小型計算機接口14線終端匹配器) |
| UCC5630A | Multimode SCSI 9 Line Terminator(多模式小型計算機接口9線終端匹配器) |
| UCC5631A | Multimode SCSI 9 Line Terminator(多模式小型計算機接口14線終端匹配器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UCC5621FQP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Terminator |
| UCC5621FQPTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Terminator |
| UCC5621MWP | 功能描述:SCSI 接口集成電路 27line 3 5V SCSI SE RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
| UCC5621MWPG4 | 功能描述:SCSI 接口集成電路 27Line 5V SE Term RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
| UCC5621MWPTR | 功能描述:SCSI 接口集成電路 27Line 5V SE Term RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
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