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UCC5673 Datasheet(PDF) 5 Page - Texas Instruments

Part No. UCC5673
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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UCC5673 Datasheet(HTML) 5 Page - Texas Instruments

   
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UCC5673
low 0.5V, the termination network is SE. Between 0.7V
and 1.9V, the termination network switches to LVD, and
above 2.4V is HVD, causing the terminators to discon-
nect from the bus. The thresholds accommodate differ-
ences in ground potential that can occur with long lines.
Three UCC5673 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,
with allowance for the 3.3V supply tolerance (+/- 10%), a
unidirectional fusing device and cable drop. In 3.3V
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
UCC5673
UCC5673
27
TRMPWR
27
TRMPWR
REG
TRMPWR
DISCNCT
DIFFB
28
13
1
17
2
3
L1+
L1–
L9+
L9–
27
TRMPWR
TRMPWR
REG
1
28
DISCNCT 13
2
3
L1+
L1–
L9+
L9–
DIFFB
17
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–
27
TRMPWR
TRMPWR
REG
1
28
DISCNCT 13
2
3
L1+
L1–
L9+
L9–
DIFFB
17
27
TRMPWR
25
25
26
26
UCC5673
UCC5673
UCC5673
UCC5673
Figure 1. Application diagram.
Note: Indicated pinout is for 28 pin TSSOP package.
UDG-99163


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