Lowest Capacitance 9-Line 3-5V SE Terminator For SCSI Through Ultra SCSI

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 A, 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.
The UCC5614 CAN be programmed for either a 110- or 2.5-k termination. The 110- termination is used for standard SCSI bus lengths and the 2.5-k termination is typically used in short bus applications. When driving the TTL compatible DISCNCT pin directly, the 110- termination is connected when the DISCNCT pin is driven low, and disconnected when driven high. When the DISCNCT pin is driven through an impedance between 80 k and 150 k, the terminator is in short bus mode. The 2.5-k termination is connected when the DISCNCT pin is driven low and disconnected when driven high.
The power Amplifier output stage allows the UCC5614 to source full termination current and sink active negation current when all termination lines are actively negated.
The UCC5614 is pin for pin compatible with Unitrode?s other 9-line SCSI terminators, allowing lower capacitance and lower voltage upgrades to existing systems. The UCC5614 as with all Unitrode terminators, is completely hot pluggable and appears as high impedance at the terminating channels with VTRMPWR = 0 V or open.
Internal circuit trimming is utilized, first to trim the 110- termination impedance to a 7% tolerance, and then most importantly, to trim the output current to a 4% tolerance, as close to the max SCSI specification as possible, which maximizes noise margin in fast SCSI operation.
Other features include thermal shutdown and current limit.
This device is offered in low thermal resistance versions of the industry standard 16-pin narrow body SOIC, 16-pin N and 24-pin TSSOP.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
UCC5614PWPTRG4 Texas Instruments 9-LINE 110ohm SCSI BUS TERMINATOR, PDSO24, GREEN, PLASTIC, TSSOP-24
UCC5614DPTRG4 Texas Instruments IC 9-LINE 110 ohm SCSI BUS TERMINATOR, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16, Bus Terminator
UCC5614 's PackagesUCC5614 's pdf datasheet
UCC5614DP13CE SOIC
UCC5614DPG4 SOIC
UCC5614DPTR SOIC
UCC5614DPTRG4 SOIC
UCC5614PWP TSSOP
UCC5614PWPG4 TSSOP
UCC5614PWPTR TSSOP
UCC5614PWPTRG4 TSSOP
UCC5614Z




UCC5614 Pinout, Pinouts
UCC5614 pinout,Pin out
This is one package pinout of UCC5614,If you need more pinouts please download UCC5614's pdf datasheet.

UCC5614 Application circuits
UCC5614 circuits
This is one application circuit of UCC5614,If you need more circuits,please download UCC5614's pdf datasheet.


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