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UCC5672 Datasheet(PDF) 1 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) 1 Page - Texas Instruments

   
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UCC5672
SLUS414A - FEBRUARY 2000
FEATURES
• Auto Selection Multi-Mode Single
Ended or Low Voltage Differential
Termination
• 2.7V to 5.25V Operation
• Differential Failsafe Bias
• Built-in SPI-3 Mode Change Filter/
Delay
• Meets SCSI-1, SCSI-2, Ultra2 (SPI-2
LVD) and Ultra3/Ultra160 Standards
• Supports Active Negation
• 3pF Channel Capacitance
Multimode (LVD/SE) SCSI 9 Line Terminator
1
27
16
DIFSENS
DIFSENS
REF 1.3V
ENABLE
3L1–
52
2L1+
52
L9–
L9+
56mV
+–
56mV
–+
124
110
SE GROUND
SWITCH
26
52
25
52
56mV
+–
56mV
–+
124
110
SE GROUND
SWITCH
REG
17
DIFFB
0.6V
2.1V
FILTER/
DELAY
28
TRMPWR
TRMPWR
LVD REF
1.25V
SOURCE/SINK
REGULATORS
SE REF
2.7V
ENABLE
SW1
10
µA
22
6
HS/GND
HS/GND
14
GND
13
DISCNCT
SE
DISCNCT
HPD
LVD
UP
OPEN
DOWN
DOWN
DOWN
UP
OPEN
OPEN
MODE
SW1
OTHER
SWITCHES
HPD
LVD
SE
BLOCK DIAGRAM
UDG-99125
DESCRIPTION
The UCC5672 Multi-Mode Low Voltage Differential and Single Ended Ter-
minator is both a single ended terminator and a low voltage differential ter-
minator for the transition to the next generation SCSI Parallel Interface
(SPI-3). The low voltage differential is a requirement for the higher speeds
at a reasonable cost and is the only way to have adequate skew budgets.
The automatic mode select/change feature switches the terminator be-
tween Single Ended or LVD SCSI Termination, depending on the bus
mode. If the bus is in High Voltage Differential Mode, the terminator lines
transition into a High Impedance state.
The UCC5672 is SPI-3, SPI-2, and SCSI-2 compliant. This device is of-
fered in a 28 pin TSSOP package to minimize the footprint. The UCC5672
is also available in a 36 pin MWP package.
Note: Indicated pinout is for 28 pin TSSOP package.


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