Obsolete Device
UCC5614
SLUS349B − DECEMBER 1994 − REVISED APRIL 2005
9 LINE 3 TO 5 VOLT LOW CAPACITANCE SCSI ACTIVE TERMINATOR
FEATURES
D
Complies with SCSI, SCSI−2 and SPI−2 Single
D
D
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D
D
D
D
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Ended Standards
2.7-V to 5.25-V Operation
1.8-pF Channel Capacitance during
Disconnect
0.5-µA Supply Current in Disconnect Mode
110-Ω/2.5-kΩ Programmable Termination
Completely Meets SCSI Hot Plugging
−400-mA Sourcing Current for Termination
+400-mA Sinking Current for Active Negation
Drivers
Trimmed Termination Current to 4%
Trimmed Impedance to 7%
Current Limit and Thermal Shutdown
Protection
DESCRIPTION
The UCC5614 provides 9 lines of active termination for
a small computer system’s interface (SCSI) parallel
bus. The SCSI standard recommends active
termination at both ends of the cable segment.
The UCC5614 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 2.7-V reference. During disconnect the supply
current is typically only 0.5
µA,
which makes the device
attractive for battery powered systems.
The UCC5614 is designed with an ultra low channel
capacitance of 1.8 pF, which eliminates effects on signal
i
cted terminators at interim points
on the bus.
BLOCK DIAGRAM
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2005, Texas Instruments Incorporated
www.ti.com
1
TI [ TEXAS INSTRUMENTS ]
