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UC5612PW, UC5613, UC5613PW

Table of contents:
Info of UC5612PW
Info of UC5613
Info of UC5613PW

UC5612PW, UC5613, UC5613PW Selling Leads, Datasheet

MFG:TI Package Cooled:TSOP24 D/C:09+

UC5612PW, UC5613, UC5613PW Datasheet download

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Part Number: UC5612PW

MFG: TI

Package Cooled: TSOP24

D/C: 09+

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UC5613 General Description

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 drivenhigh, disconnects all terminating resistors and disables the regulator greatly reducing standby power. The output channels 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 compatible with its predecessor, the UC5603 - 9 line Active Terminator. The only functional difference between the UC5613 and UC5603 is the absence of the negative clamps. Parametrically, the UC5613 has a 5% tolerance on impedance 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 as possible to the 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 Maximum Ratings

Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. +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

Unless otherwise specified all voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Unitrode Integrated Circuits databook for thermal limitations and considerations of packages.

UC5613 Features

` Complies with SCSI, SCSI-2 and SPI-2 Standards
` 3pF Channel Capacitance during Disconnect
` 100A 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

UC5613 Connection Diagram

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