UCC5672 Multimode (LVD/SE) SCSI 9 Line Terminator
FEATURES DESCRIPTION Auto Selection Multi-Mode Single
Ended or Low Voltage Differential
Termination The UCC5672 Multi-Mode Low Voltage Differential and Single Ended Terminator is both a single ended terminator and a low voltage differential terminator 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. 2.7V to 5.25V Operation Differential Failsafe Bias The automatic mode select/change feature switches the terminator between 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. Built-in SPI-3 Mode Change Filter/
Delay Meets SCSI-1, SCSI-2, Ultra2 (SPI-2
LVD), Ultra3/Ultra160 (SPI-3) and
Ultra320 (SPI-4) Standards The UCC5672 is SPI-4, SPI-3, SPI-2, and SCSI-2 compliant. This device
is offered in a 28 pin TSSOP package to minimize the footprint. The
UCC5672 is also available in a 36 pin MWP package. Supports Active Negation 3pF Channel Capacitance BLOCK DIAGRAM HPD 2.1V
DIFFB FILTER/
DELAY 17 LVD 0.6V SE DIFSENS
REF 1.3V TRMPWR 28 TRMPWR 27 DIFSENS 3 L1– 2 L1+ 26 L9– 25 L9+ ENABLE
SOURCE/SINK
REGULATORS
SE REF
2.7V
10ВµA DISCNCT 16 SW1 LVD REF
1.25V 110 124 13 56mV
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