Plug Play, 18-Line SCSI Active Terminator Complies with SCSI SCSI

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Plug Play, 18-Line SCSI Active Terminator Complies with SCSI SCSI

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UC5607
Plug Play, 18-Line SCSI Active Terminator
Complies with SCSI SCSI-2 Standards Channel Capacitance during Disconnect SCSI Plug Play, Dual Disconnect, Logic Command Disconnects Termination Lines Meets SCSI Plugging Capability -650mA Sourcing Current Termination +200mA Sinking Current Active Negation 200µA Supply Current Disconnect Mode Trimmed Termination Current Trimmed Impedance Provides Active Termination Lines
DESCRIPTION
UC5607 provides lines active termination SCSI (Small Computer Systems Interface) parallel bus. SCSI standard recommends active termination both ends cable segment. UC5607 provides disconnect feature which will disconnect terminating resistors, will disable regulator, greatly reducing standby power. output channels remain high impedance even without Termpwr applied. UC5607 terminator specially designed with disconnect pins full SCSI Plug Play (PnP) applications. Custom power packages utilized allow normal operation full power conditions Watts). Internal circuit trimming utilized, first trim impedance tolerance, then most importantly, trim output current tolerance, close SCSI spec possible, which maximizes noise margin fast SCSI operation. Other features include thermal shutdown current limit. This device offered thermal resistance versions industry standard wide body SOIC, PLCC, well DIP.
BLOCK DIAGRAM
Circuit Design Patented
DISCNCT1 DISCNCT2
Connect Connect Connect
Disc
UDG-94124
7/98
UC5607
ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage Signal Line Voltage Regulator Output Current Storage Temperature -65°C +150°C Operating Temperature -55°C +150°C Lead Temperature (Soldering, Sec.). +300°C
CONNECTION DIAGRAMS
PLCC-28 (Top View) Package
Unless otherwise specified voltages with respect Ground. Currents positive into, negative specified terminal. Consult Packaging Section Unitrode Integrated Circuits databook thermal limitations considerations packages.
RECOMMENDED OPERATING CONDITIONS
Termpwr Voltage 3.8V 5.25V Signal Line Voltage Disconnect Input Voltage Termpwr
SOIC-28 (Top View) Package
package pins serve both heatsink signal ground. DISCNCT2 internally tied ground.
DIL-24 (Top View) Package
package serves signal ground; pins serve heatsink/ground.
Note: Drawings scale.
UC5607
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply 70°C. TRMPWR 4.75V, DISCNCT1 DISCNCT2 2.2V. PARAMETER TEST CONDITIONS
Supply Current Section Termpwr Supply Current termination lines Open termination lines 0.5V DISCNCT1 DISCNCT2 2.55 -19.5 -18.5 -18.0 -17.0 -21.9 -21.9 -21.9 -21.9 -22.4 -22.4 -22.4 -22.4
UNIT Ohms Ohms
Power Down Mode Output Section (Terminator Lines) Terminator Impedance DILINE -5mA -15mA Output High Voltage Output Current Output Current Output Leakage Output Capacitance Regulator Section Regulator Output Voltage
25°C 70°C VTRMPWR (Note 25°C 70°C VLINE 0.5V 25°C 70°C 25°C VLINE 0.5V, TRMPWR (Note 70°C DISCNCT1 DISCNCT2 TRMPWR 5.25V DISCNCT1 DISCNCT2 (Note Termination Lines 25°C 70°C
2.55
Line Regulation TRMPWR Load Regulation IREG +100mA -100mA Note Measuring each termination line while other (0.5V). Note Guaranteed design. 100% tested production.
APPLICATION INFORMATION
UDG-98136
Figure Typical SCSI Configuration Utilizing UC5607 Device
UNITRODE CORPORATION CONTINENTAL BLVD. MERRIMACK, 03054 TEL. (603) 424-2410 _FAX (603) 424-3460
IMPORTANT NOTICE Texas Instruments subsidiaries (TI) reserve right make changes their products discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability. warrants performance semiconductor products specifications applicable time sale accordance with TI's standard warranty. Testing other quality control techniques utilized extent deems necessary support this warranty. Specific testing parameters each device necessarily performed, except those mandated government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS INVOLVE POTENTIAL RISKS DEATH, PERSONAL INJURY, SEVERE PROPERTY ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). SEMICONDUCTOR PRODUCTS DESIGNED, AUTHORIZED, WARRANTED SUITABLE LIFE-SUPPORT DEVICES SYSTEMS OTHER CRITICAL APPLICATIONS. INCLUSION PRODUCTS SUCH APPLICATIONS UNDERSTOOD FULLY CUSTOMER'S RISK. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. assumes liability applications assistance customer product design. does warrant represent that license, either express implied, granted under patent right, copyright, mask work right, other intellectual property right covering relating combination, machine, process which such semiconductor products services might used. TI's publication information regarding third party's products services does constitute TI's approval, warranty endorsement thereof.
Copyright 1999, Texas Instruments Incorporated

Plug Play, 18-Line SCSI Active Terminator Complies with SCSI SCSI

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