Texas Instruments UC5613Z, UC5613QPTR, UC5613QP, UC5613PWPTR, UC5613PWP Datasheet

• Complies with SCSI, SCSI-2 and

SPI-2 Standards

• 3pF Channel Capacitance during
Disconnect

• 100µA Supply Current in
Disconnect Mode

• Meets SCSI Hot Plugging Capability

•−400mA Sourcing Current for

Termination

• +400mA Sinking Current for Active
Negation

• Logic Command Disconnects all
Termination Lines

• Trimmed Termination Current to 5%

• Trimmed Impedance to 5%

• Current Limit and Thermal

Shutdown Protection

The UC5613 provides 9 lines of active termination for a SCSI (Small Com­puter Systems Interface) parallel bus. The SCSI standard recommends ac­tive termination at both ends of the cable segment.

The UC5613 provides a disconnect feature which, when opened or driven
high, disconnects all terminating resistors and disables the regulator
greatly redu cing stan dby power. The output c hannels remain high imped­ance even without Termpwr applied. A low channel capacitance of 3pF al­lows units at interim points of the bus to have little or no effect on the signal
integrity.

The UC5613 is pin-for-pin compatibl e with its predeces sor, the UC5603 - 9
line Active Terminator. The only functiona l differ ence be twee n the UC5613
and UC5603 is the absence of the negative clamps. Parametrically, the
UC5613 has a 5 % tol er ance o n im peda nce and current compared to a 3%
tolerance on the UC5603. Custom power packages are utilized to allow
normal operation at full power (1.2 watts).

Internal circuit trimming is utilized, first to trim the impedance to a 5% toler­ance; then, the output current is trimmed to a 5% tolerance. The output
current trim is set as close a s possi ble to th e maximum value of the SCSI
specification which maximizes the noise margin for 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),
and 24 pin TSSOP.

UC5613

9-Line Low Capacitance SCSI Active Terminator

FEATURES DESCRIPTION

BLOCK DIAGRAM

Circuit Design Patented

3/97

UDG-94003-1

ABSOLUTE MAXIMUM RATINGS

Termpwr Vo ltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V

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

Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8V to 5.25V

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

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

CONNECTION DIAGRAMS

DIL-16 (Top View)
N or J Package

UC5613

* DP packag e pi n 5 se rves as signal ground; pins 4, 12, 13
serve as heatsink/ground.

* PWP package pin 5 serves as signal ground; pins 6, 7, 8, 9,
17, 18, 19, and 20 serve as heatsink/ground.

ZIP-16 (Top View)
Z Package

SOIC-16 (Top View)
DP Package

TSSOP-24 (To p View)
PWP Package

Note: Drawings are not to scale.

Unless otherwise sp ec ified all voltages are with respect to G r ou nd . C urre nt s are pos i­tive into, negative out of the specified terminal.
Consult Packaging Section of Unitrode Integrated Circuits databook for thermal limita­tions and consid era ti on s of pac ka ges.

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