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UCC5620
27-Line SCSI Terminator
FEATURES
* Complies with SCSI, SCSI-2, SCSI-3, SPI and FAST-20 (Ultra) Standards * 2.5pF Channel Capacitance during Disconnect * 100mA Supply Current in Disconnect Mode * 4V To 7V Operation * 110 Termination * Completely Meets SCSI Hot Plugging * -900mA Sourcing Current for Termination * +500mA Sinking Current for Active Negation * Logic Command Disconnects all Termination Lines * Trimmed Impedance to 5% * Current Limit and Thermal Shutdown Protection
DESCRIPTION
UCC5620 provides 27 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. The UCC5620 is ideal for high performance 5V SCSI systems. During disconnect the supply current is typically only 100A, which makes the IC attractive for lower powered systems. The UCC5620 is designed with a low channel capacitance of 2.5pF, which eliminates effects on signal integrity from disconnected terminators at interim points on the bus. The power amplifier output stage allows the UCC5620 to source full termination current and sink active negation current when all termination lines are actively negated. The UCC5620, as with all Unitrode terminators, is completely hot pluggable and appears as high impedance at the teminating channels with VTRMPWR = 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. Other features include thermal shutdown and current limit. This device is offered in low thermal resistance versions of the industry standard 36-Pin Wide Body QSOP (MWP) and 48-Pin LQFP (FQP). Consult QSOP-36 or LQFP-48 packaging diagram for exact dimensions.
BLOCK DIAGRAM
Circuit Design Patented
UDG-96109
SLUS287A - OCTOBER 1999
UCC5620
ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A Storage Temperature . . . . . . . . . . . . . . . . . . . -65 C to +150 C Junction Temperature . . . . . . . . . . . . . . . . . . . -55 C to +150 C Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300 C
CONNECTION DIAGRAM
SSOP-36 (Top View) MWP Package
LINE8 LINE9 LINE23 LINE24 LINE25
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
LINE7 LINE6 LINE5 LINE22 LINE21 LINE20 LINE19 REG GND GND GND TRMPWR LINE18 LINE17 LINE16 LINE15 LINE4 LINE3
Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.
LFQP-48 (Top View) FQP Package
HS/GND HS/GND LINE 9 LINE 23 LINE 24 N/C HS/GND LINE 8 LINE 7 LINE 6 LINE 5 LINE 22
LINE26 LINE27 GND GND GND DISCNCT
LINE 21 LINE 20 LINE 19 REG HS/GND HS/GND HS/GND HS/GND TRMPWR LINE 18 LINE 17 LINE 16
48 47 N/C LINE 25 LINE 26 LINE 27 HS/GND HS/GND HS/GND HS/GND N/C DISCNCT1 LINE 10 LINE 11 1 2 3 4 5 6 7 8 9 10 11 12 13 14
46
45
44 43
42
41
40 39
38
37 36 35 34 33 32 31 30 29 28 27 26 25
LINE10 LINE11 LINE12 LINE13 LINE14 LINE1 LINE2
15
16
17 18
19
20
21 22
23
24
N/C LINE 12 LINE 13 LINE 14 HS/GND HS/GND
LINE 15 LINE 4 LINE 3 LINE 2 LINE 1 HS/GND
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0C to 70C, TRMPWR
= 4.75V, DISCNCT = 0V, TA = TJ. PARAMETER Supply Current Section TRMPWR Supply Current Power Down Mode All Termination Lines = Open All Termination Lines = 0.2V DISCNCT = TRMPWR 1 630 100 2 650 200 mA mA A TEST CONDITIONS MIN TYP MAX UNITS
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UCC5620
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0C to 70C, TRMPWR
= 4.75V, DISCNCT = 0V, TA = TJ. PARAMETER Output Section (Termination Lines) Termination Impedance Output High Voltage Max Output Current (Note 3) (Note 1) VLINE = 0.2V, TJ = 25C VLINE = 0.2V VLINE = 0.2V, TRMPWR = 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 -20 2.0 -60 V A All Termination Lines = 0.2V VREG = 0V VREG = 3.5V -650 300 2.6 2.8 0.4 -900 500 170 10 3.0 0.8 -1300 900 V V mA mA C C DISCNCT = 2.4V, TRMPWR = 0V to 5.25V DISCNCT = 2.4V (Note 2) 10 2.5 104.5 2.6 -22.1 -20.7 -21 -20 110 2.8 -23.3 -23.3 -23 -23 115.5 3.0 -24 -24 -24 -24 -22.4 400 4 V mA mA mA mA mA nA pF TEST CONDITIONS MIN TYP MAX UNITS
Note 1:Measuring each termination line while other 26 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 calculate: Z=
(VOUT N . L.- 0 . 2V )
IOUT at 0 . 2V
PIN DESCRIPTIONS
DISCNCT: Taking this pin high or leaving it open causes all channels to become high impedance, and the chip to go into low-power mode; a low state allows the channels to provide normal termination. GND: Ground reference for the IC. LINE1 - LINE27: 110 termination channels. REG: Output of the internal 2.7V regulator. TRMPWR: Power for the IC.
3
UCC5620
APPLICATION INFORMATION
UCC5620 TRMPWR TRMPWR
DISCNCT REG
4.7F
L1
L27
4.7F
DATA BYTES 1 AND 2 +2 PARITY BITS TO DRIVERS AND RECEIVERS
CONTROL BITS
TO SCSI BUS
UDG-98188
Figure 1. Typical Wide SCSI Bus Configuration Using the UCC5620
UNITRODE CORPORATION 7 CONTINENTAL BLVD. * MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX (603) 424-3460
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Copyright (c) 2000, Texas Instruments Incorporated

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