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UCC5610 Datasheet(PDF) 1 Page - Texas Instruments

Part No. UCC5610
Description  18-Line 3-5 Volt Low Capacitance SCSI Active Terminator
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC5610 Datasheet(HTML) 1 Page - Texas Instruments

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The UCC5610 provides 18 lines of active termination for a SCSI (Small
Computer Systems Interface) parallel bus. The SCSI standard recom-
mends active termination at both ends of the cable.
The UCC5610 is ideal for high performance 3.3V SCSI systems. The key
features contributing to such low operating voltage are the 0.1V drop out
regulator and the 2.75V reference. The reduced reference voltage was
necessary to accommodate the lower termination current dictated in the
SCSI-3 specification. 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 ultra low channel capacitance of
1.8pF, which eliminates effects on signal integrity from disconnected ter-
minators at interim points on the bus.
The UCC5610 can be programmed for either a 110 ohm or 2.5k ohm ter-
mination. The 110 ohm termination is used for standard SCSI bus lengths
and the 2.5k ohm termination is typically used in short bus applications.
When driving the TTL compatible DISCNCT pin directly, the 110 ohm ter-
mination is connected when the DISCNCT pin is driven low, and discon-
nected when driven high. When the DISCNCT pin is driven through an
impedance between 80k and 150k, the 2.5k ohm termination is con-
nected when the DISCNCT pin is driven low, and disconnected when
driven high.
18-Line 3-5 Volt Low Capacitance SCSI Active Terminator
Circuit Design Patented
Complies with SCSI, SCSI-2, SCSI-3
and FAST-20 (Ultra) Standards
2.75V to 7V Operation
1.8pF Channel Capacitance during
µA Supply Current in Disconnect
110 Ohm/2.5k Programmable
Completely Meets SCSI Hot Plugging
-650mA Sourcing Current for
+400mA Sinking Current for Active
Negation Drivers
Trimmed Termination Current to 4%
Trimmed Impedance to 7%
Current Limit and Thermal Shutdown

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