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UCC5672 Datasheet(PDF) 5 Page - Texas Instruments

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Part No. UCC5672
Description  Multimode LVD/SE SCSI 9 Line Terminator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC5672 Datasheet(HTML) 5 Page - Texas Instruments

   
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UCC5672
nation for the bus as follows. If the DIFSENS signal is
below 0.5V, the termination network is set for single
ended. Between 0.7V and 1.9V, the termination network
switches to LVD SCSI, and above 2.4V indicates HVD
SCSI, causing the terminators to disconnect from the
bus. These thresholds accommodate differences in
ground potential that can occur with long lines.
Three UCC5672 multi-mode parts are required at each
end of the bus to terminate 27 (18 data, plus 9 control)
lines. Each part includes a DIFSENS driver, but only one
is necessary to drive the line. The DIFFB inputs on all
three parts are connected together, allowing them to
share the same 50Hz noise filter. This multi-mode termi-
nator operates in full specification down to 2.7V
TRMPWR voltage. This accommodates 3.3V systems,
APPLICATION INFORMATION (cont.)
REG
TRMPWR
DISCNCT
TRMPWR
DIFFB
REG
Termpower
Termpower
28
13
16
1
17
16
1
28
DISCNCT 13
CONTROL LINES (9)
20k
20k
DIFF SENSE
2
2
3
3
4.7
µF
0.1
µF
25
25
26
26
L1+
L1–
L9+
L9–
L1+
L1–
L9+
L9–
4.7
µF
DIFFB
17
0.1
µF
DATA LINES (9)
4.7
µF
4.7
µF
4.7
µF
4.7
µF
UCC5672
UCC5672
27
TRMPWR
27
TRMPWR
REG
TRMPWR
DISCNCT
DIFFB
28
13
1
17
2
3
L1+
L1–
L9+
L9–
UCC5672
27
TRMPWR
TRMPWR
REG
1
28
DISCNCT 13
2
3
L1+
L1–
L9+
L9–
DIFFB
17
UCC5672
27
TRMPWR
25
25
26
26
DATA LINES (9)
4.7
µF
4.7
µF
REG
TRMPWR
DISCNCT
DIFFB
28
13
1
17
2
3
L1+
L1–
L9+
L9–
UCC5672
27
TRMPWR
TRMPWR
REG
1
28
DISCNCT 13
2
3
L1+
L1–
L9+
L9–
DIFFB
17
UCC5672
27
TRMPWR
25
25
26
26
Figure 1. Application diagram.
Note: Indicated pinout is for 28 pin TSSOP package.


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