SCSI Active Terminator Complies with SCSI, SCSI-2 Standards 10pF

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SCSI Active Terminator Complies with SCSI, SCSI-2 Standards 10pF

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UC5602
SCSI Active Terminator
Complies with SCSI, SCSI-2 Standards 10pF Channel Capacitance During Disconnect Active Termination Lines Logic Command Disconnects Termination Lines Supply Current Disconnect Mode Trimmed Regulator Accurate Termination Current Current Limit Thermal Shutdown Protection Termination Meets SCSI Plugging
DESCRIPTION
UC5602 compatible version predecessor, UC5601, targeted high volume applications which require active termination, high performance UC5601. major differences relaxed output current termination tolerances, absence side clamps. UC5602 provides lines active termination SCSI (Small Computer Systems Interface) parallel bus. SCSI-2 standard recommends active termination both ends cable segment, SCSI-3 will make requirement. UC5602 provides disconnect feature which, when opened driven high, will disconnect terminating resistors, disables regulator; greatly reducing standby power. output channels remain high impedance even without Termpwr applied. Internal circuit trimming utilized, first trim impedance tolerance; then most importantly, trim output current tolerance, close SCSI possible, which maximizes noise margin fast SCSI operation. Other features include thermal shutdown, current limit, 40mA active negation sink current capability. This device offered thermal resistance versions industry standard wide body SOIC PLCC, well plastic package.
BLOCK DIAGRAM
UDG-94052
10/94
Circuit Design Patented
UC5602
ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage Signal Line Voltage. Regulator Output Current 0.5A Storage Temperature -65°C +150°C Operating Temperature -55°C +150°C Lead Temperature (Soldering, Sec.) +300°C Unless otherwise specified voltages with respect Ground. Currents positive into, negative specified terminal. Consult Packaging Section Unitrode Integrated Circuits databook thermal limitations considerations packages.
CONNECTION DIAGRAMS
PLCC-28 (Top View) Package
RECOMMENDED OPERATING CONDITIONS
Termpwr Voltage 4.0V 5.25V Signal Line Voltage. Disconnect Input Voltage Termpwr
package pins serve both heatsink signal ground.
SOIC-28 (Top View) Package
DIL-24 (Top View) Package
package serves signal ground; pins serve heatsink/ground.
Note: Drawings scale.
UC5602 ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply 70°C.
TRMPWR 4.75V, DISCNCT PARAMETER Supply Current Section Termpwr Supply Current TEST CONDITIONS 2.55 -19.5 -18.5 -18.0 -17.0 -21.4 -21.5 2.55 -650 -22.4 -22.4 -22.4 -22.4 -850 UNITS
termination lines Open termination lines 0.5V Power Down Mode DISCNCT Open Output Section (Termination Lines) Termination Impedance ILINE -5mA -15mA Output High Voltage Output Current Output Current Output Leakage
Output Capacitance Regulator Section Regulator Output Voltage Line Regulation Load Regulation Drop Voltage Short Circuit Current Sinking Current Capability Thermal Shutdown Disconnect Section Disconnect Threshold Threshold Hysteresis Input Current
25°C 70°C VTRMPWR (Note 25°C 70°C VLINE 0.5V 25°C 70°C VLINE 0.5V, TRMPWR (Note 25°C 70°C TRMPWR 5.25V VLINE VLINE 5.25V DISCNCT TRMPWR 5.25V, Open VLINE 5.25V DISCNCT Open (Note 25°C 70°C TRMPWR IREG -400mA Termination Lines 0.5V VREG VREG 3.5V
-450
DISCNCT
Note Measuring each termination line while other (0.5V). Note Guaranteed design. 100% tested production.
THERMAL DATA
package: (see packaging section UICC data book more details thermal performance) Thermal Resistance Junction Leads, 18°C/W Thermal Resistance Junction Ambient, 33°-43°C/W package: Thermal Resistance Junction Leads, 50°C/W Thermal Resistance Junction Ambient, 95°-105°C/W package: Thermal Resistance Junction Leads, 15°C/W Thermal Resistance Junction Ambient, 30°-40°C/W
Note: above numbers maximums limiting thermal resistance package standard mounting configuration. numbers meant guidelines thermal performance device/pc-board system. above numbers assume ambient airflow.
UC5602
UDG-94053
Typical SCSI Configuration Using UC5602
Look Response SCSI-2 Cable Figure shows single line SCSI cable. driver open colletor type which when asserted pulls low, when negated termination resistance serves pull-up. Figure shows worst case scenario cable deassertion with close proximity receiver. voltage VSTEP defined VSTEP Driver Output Voltage Current from Receiving Terminator Cable Characteristic Impedance
VREG
UDG-94054
Figure Single Line SCSI Cable
pursuit higher data rates, sampling could occur during this step portion, therefore important ensure that step high possible most noise margin. this reason UC5602 trimmed that output current (IO) close possible SCSI current spec 22.4mA. Termination impedance initially trimmed ohms typical, then regulator voltage trimmed highest output current within 22.4mA.
UDG-94055
Figure Typical Response SCSI Cable
UC5602
Output Current Temperature
VREF Temperature
VREF
Output Impedance Temperature
UNITRODE INTEGRATED CIRCUITS CONTINENTAL BLVD. MERRIMACK, 03054 TEL. (603) 424-2410 (603) 3460

SCSI Active Terminator Complies with SCSI, SCSI-2 Standards 10pF

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