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UCC5617
18-Line SCSI Terminator (Reverse Disconnect)
FEATURES
* Complies with SCSI, SCSI-2, SCSI-3, SPI and FAST-20 Standards * 2pF Channel Capacitance During Disconnect * 50mA Supply Current in Disconnect Mode * 110 Termination
DESCRIPTION
The UCC5617 provides 18 lines of active termination for a SCSI (Small Computers Systems Interface) parallel bus. The SCSI standard recommends and Fast-20 (Ultra) requires active termination at both ends of the cable. Pin for pin compatible with the UC5609, the UCC5617 is ideal for high performance 5V SCSI systems, Termpwr 4.0-5.25V. During disconnect the supply current is only 50 A typical, which makes the IC attractive for lower powered systems. The UCC5617 is designed with a low channel capacitance of 2pF, which eliminates effects on signal integrity from disconnected terminators at interim points on the bus. The power amplifier output stage allows the UCC5617 to source full termination current and sink active negation current when all termination lines are actively negated. The UCC5617, as with all Unitrode terminators, is completely hot pluggable and appears as high impedance at the terminating channels with TRMPWR = 0V or open. Internal circuit trimming is utilized, first to trim the 110 impedance, and then most importantly, to trim the output current as close to the maximum SCSI-3 specification as possible, which maximizes noise margin in fast SCSI operation. This device is offered in low thermal resistance versions of the industry standard 28 pin wide body SOIC.
* SCSI Hot Plugging Compliant, 10nA Typical * +400mA Sinking Current for Active Negation * -650mA Sourcing Current for Termination * Trimmed Impedance to 5% * Thermal Shutdown * Current Limit
BLOCK DIAGRAM
Patented Circuit Design
UDG-96073
SLUS351A - APRIL 1997 - REVISED AUGUST 2002
UCC5617
CONNECTION DIAGRAMS
SOIC-28 (Top View) DWP Package
ABSOLUTE MAXIMUM RATINGS
TEMPWR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A Storage Temperature . . . . . . . . . . . . . . . . . . . -65C to +150C Operating Junction Temperature . . . . . . . . . . -55C to +150C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300C
All currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.
* DWP package pin 28 serves as signal ground; pins 7, 8, 9, 20, 21, 22 serve as heatsink/ground.
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UCC5617
ELECTRICAL CHARACTERISTICS: Unless otherwise stated these specifications apply for TA = 0C to 70C,
TRMPWR = 4.75V, DISCNCT = 0V, TA = TJ. PARAMETER Supply Current Section TERMPWR Supply Current Power Down Mode Output Section (Termination Lines) Termination Impedance Output High Voltage Max Output Current (Note 3) VTRMPWR = 4V (Note 1) VLINE = 0.2V, TJ = 25C VLINE = 0.2V VLINE = 0.2V, TERMPWR = 4V, TJ = 25C (Note 1) VLINE = 0.2V, TRMPWR = 4V (Note 1) VLINE = 0.5V Output Leakage Output Capacitance Regulator Section Regulator Output Voltage Drop Out Voltage Short Circuit Current Sinking Current Capability Thermal Shutdown Thermal Shutdown Hysteresis Disconnect Section Disconnect Threshold Input Current DISCNCT = 0V 0.8 1.5 -10 2 -30 V A All Termination Lines = 0.2V VREG = 0V VREG = 3.5V -475 200 2.6 2.8 0.4 -650 400 170 10 3 0.8 -850 800 V V mA mA C C DISCNCT = 2.4V, TRMPWR = 0V to 5.25V, REG = 0.2V, VLINE = 5.25V DISCNCT = 2.4V (Note 2) 10 2 104.5 2.6 -22.1 -20.7 -21 -20 110 2.8 -23.3 -23.3 -23.3 -23 115.5 3 -24 -24 -24 -24 -22.4 400 3.5 V mA mA mA mA mA nA pF All Termination Lines = Open All Termination Lines = 0.2V DISCNCT = 0V 1 420 50 2 440 100 mA mA A TEST CONDITIONS MIN TYP MAX UNITS
Note 1: Measuring each termination line while other 17 are low (0.2V). Note 2: Guaranteed by design. Not 100% tested in production. Note 3: Tested by measuring IOUT with VOUT = 0.2V and VOUT with no load, then calculating: Z = VOUT N . L. - 0 . 2V IOUT at 0 . 2V
PIN DESCRIPTIONS
DISCNCT: Taking this pin low causes the 18 channels to become high impedance and the chip to go into low-power mode; a high or open state allows the channels to provide normal termination. GND: Ground reference for the IC. LINE1-LINE18: 110 termination channels.
REG: Output of the internal 2.8V regulator. TRMPWR: Power for the IC.
3
UCC5617
APPLICATION INFORMATION
Procedure: 1) Measure VREG N.L. 2) Set VL = 0.2V 3) Measure IMAX at 0.2V 4) Impedance =
VREG N .L.- 0.2V IMAX
UDG-96108
Figure 1. Termline Impedance Measurement Circuit
UDG-96074
4
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