UCC5614

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 ter-

Internal circuit trimming is utilized, first to trim the 110

ohm termination impedance to a 7% tolerance, and then

most importantly, to trim the output current to a 4% toler-

ance, as close to the max SCSI-3 spec 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

ZIP (Zig-Zag In Line package), 24 pin TSSOP and 28 pin

PLCC.

ABSOLUTE MAXIMUM RATINGS

Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V

Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V

Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6A

Storage Temperature . . . . . . . . . . . . . . . . . . .

−−65°C to +150°C

Operating Temperature . . . . . . . . . . . . . . . . .

−−55°C to +150°C

Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . . +300°C

RECOMMENDED OPERATING CONDITIONS

Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V

Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +5V

Disconnect Input Voltage . . . . . . . . . . . . . . . . . . 0V to Termpwr

Description Continued

Unless otherwise specified all voltages are with respect to

Ground. Currents are positive into, negative out of the speci-

fied terminal.

Consult Packaging Section of Unitrode Integrated Circuits dat-

abook for thermal limitations and considerations of packages.

CONNECTION DIAGRAMS

DIL-16 (Top View)

N or J Package

ZIP-16 (Top View)

Z Package

Note: Drawings are not to scale.

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