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UCC5621MWPTR Datasheet

  • UCC5621MWPTR

  • Terminator

  • 5頁

  • ETC

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UCC5621
27 - Line SCSI Terminator With Split Reverse Disconnect
FEATURES
鈥?/div>
Complies with SCSI, SCSI-2, SCSI-3,
SPI and FAST-20 (Ultra) Standards
鈥?/div>
2.5pF Channel Capacitance During
Disconnect
鈥?/div>
100碌A(chǔ) Supply Current in Disconnect
Mode
鈥?/div>
4V To 7V Operation
鈥?/div>
110鈩?Termination
鈥?/div>
Completely Meets SCSI Hot Plugging
鈥?/div>
鈥?00mA Sourcing Current for
Termination
鈥?/div>
+500mA Sinking Current for Active
Negation
鈥?/div>
Logic Command Disconnects all
Termination Lines
鈥?/div>
Split Reverse Controls Lines 1 to 9
and 10 to 27 Separately
鈥?/div>
Trimmed Impedance to 5%
鈥?/div>
Current Limit and Thermal Shutdown
Protection
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碌A(chǔ), 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鈩?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)
BLOCK DIAGRAM
Circuit Design Patented
UDG-96111
10/98
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UCC5621MWPTR 產(chǎn)品屬性

  • 1,000

  • 集成電路 (IC)

  • 接口 - 信號終端器

  • -

  • SCSI

  • 27

  • -

  • 0°C ~ 70°C

  • 表面貼裝

  • 44-BSOP（0.295"，7.50mm 寬）

  • 44-SSOP

  • 帶卷 (TR)

UCC5621MWPTR相關(guān)型號PDF文件下載

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    TI
  • 英文版
    18-Line 3-5 Volt SCSI Active Terminator, Reverse Disconnect
  • 英文版
    9-Line 3-5 Volt Low Capacitance SCSI Active Terminator
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    SCSI Bus Termination
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