SIP5668 Datasheet, PDF (1/11 Pages) Vishay Siliconix – 14-Line SCSI Bus Terminators

New Product
SiP5668
Vishay Siliconix
14-Line SCSI Bus Terminators
FEATURES
D Auto Selection of S/E or LVD SCSI Termination
D 2.7-V to 5.25-V TERMPWR Range
D Meets SCSI-1, SCSI-2, SPI-2 (ULTRA-2), SPI-3
(ULTRA-160) and SPI-4 (ULTRA-320) Standards
D Integrated SPI-3 Mode Change Delay Filter
D Bus Mode Status Pins
D Differential Failsafe Bias
D Thermal Package
D On-Chip Thermal Shutdown Circuit
D Active Negation
D Hot Swap Compatible
D Pin Compatible with UCC5628
D Lead (Pb)-Free SQFP-48 Package
APPLICATIONS
D Disk Array (RAID)
D Storage Area Networks (SAN)
D Network Attached Storage (NAS)
D SCSI Cable
D Server and Workstation
D Industrial Computers
D High-End Personal Computers
DESCRIPTION
The SiP5668 provides active bus termination suitable for all
SCSI bus operational modes from SCSI-1 through SPI-4
(Ultra 320). The termination includes impedance matching of
the SCSI bus to minimize signal reflections from the end of the
bus, as well as required SCSI bus biasing for either S/E (single
ended) or LVD (low voltage differential) operation.
An integrated mode change delay filter in the SIP5668
eliminates the need for a bulky 4.7-mF low pass filter capacitor
to be compliant with SPI-3 mode change timing requirements.
signal, parity signal or control signal. Two SiP5668 ICs provide
complete termination for a wide SCSI bus.
The SiP5668 senses the operational state of the SCSI bus via
the DIFFSENS bus signal, and automatically switches to S/E
or LVD operation as required. It cannot be used on an HPD
(high power differential) SCSI bus, and goes into high
impedance mode when the voltage on the DIFFSENS line
indicates HPD operation. The SiP5668 also presents high
impedance to the SCSI bus if the DISABLE pin is asserted, or
if TERMPWR is removed from the IC.
The SiP5668 has fourteen (14) output channels (T1−T14).
Each output channel provides termination for one SCSI data
The SiP5668 is available in a lead (Pb)-free SQFP-48 package
for operation over the temperature range of 0 to 70_C.
FUNCTIONAL BLOCK DIAGRAM
MODE ³⁴
Comparators
and
Delay Filter
V t 0.5 = S/E
0.7 t V t1.9 = LVD
V u 2.4 = HPD
10 mA
LVD S/E TERMPWR
27
26
3
Current Limited
Source/Sink
Regulator
1.3 V
35 _DIFFS
Current Limited
Source/Sink
Regulator
SCSI
Terminator
Impedance
Circuits
2 _T1N
1 _T1P
DISABLE 36
Mode Control And
Enable/Disable
Circuitry
25
4
9
28
33
GND
Heat Sink GND Pins
10
REG
48 _T14N
47 _T14P
See Functional Diagrams
(Page 6) for detailed descriptions
of SCSI Terminator Impedance
Circuits in LVD and S/E modes of
operation.
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
www.vishay.com
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