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PDF SiP5678 Data sheet ( Hoja de datos )
| Número de pieza | SiP5678 | |
| Descripción | 15-Line SCSI Bus Terminators | |
| Fabricantes | Vishay | |
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SiP5678
Vishay Siliconix
15-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 Differential Failsafe Bias
D Thermal Package
D On-Chip Thermal Shutdown Circuit
D Active Negation
D Hot Swap Compatible
D Pin Compatible with UCC5638
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 SiP5678 provides active bus termination suitable for all
SCSI bus operational modes from SCSI-1 through SPI-4 (Ultra
SCSI 320). The termination includes impedance matching of
the Ultra 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.
The SiP5678 has fifteen (15) output channels (T1−T15). Each
output channel provides termination for one SCSI data signal,
parity signal or control signal. Two SiP5678 ICs provide
complete termination for a wide SCSI bus.
An integrated mode change delay filter in the SiP5678
eliminates the need for a bulky 4.7-mF low pass filter capacitor
to be compliant with SPI-3 mode change timing requirements.
The SiP5678 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 SiP5678 also presents high
impedance to the SCSI bus if the DISABLE pin is asserted, or
if TERMPWR is removed from the IC.
The SiP5678 is available in a lead (Pb)-free SQFP-48
package for operation over the temperature range of 0 to
70 _C.
FUNCTIONAL BLOCK DIAGRAM
TERMPWR
3
MODE 34
Comparators
and
Delay Filter
V t 0.5 = S/E
0.7 t V t1.9 = LVD
V u 2.4 = HPD
DISABLE 36
10 mA
Mode Control And
Enable/Disable
Circuitry
Current Limited
Source/Sink
Regulator
27
GND
4
Document Number: 73100
S-41843—Rev. A, 11-Oct-04
9 28
Heat Sink GND Pins
33
10
REG
Current Limited
Source/Sink
Regulator
1.3 V
35 DIFFS
SCSI
Terminator
Impedance
Circuits
2 T1N
1 T1P
48 T15N
47 T15P
See Functional Diagrams
(Page 6) for detailed
descriptions of SCSI Terminator
Impedance Circuits in LVD and
S/E modes of operation.
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PIN CONFIGURATION AND ORDERING INFORMATION
SiP5678
Vishay Siliconix
12 11 10 9 8 7 6 5 4 3 2 1
T3P 13
48 T15N
T3N 14
47 T15P
T4P 15
46 T14N
T4N 16
T5P 17
45 T14P
44 T13N
T5N
18 SiP5678 (SQFP-48)
43
T13P
T6P 19
Top View
42 T12N
T6N 20
41 T12P
T7P 21
40 T11N
T7N 22
39 T11P
T8P 23
38 T10N
T8N 24
37 T10P
25 26 27 28 29 30 31 32 33 34 35 36
ORDERING INFORMATION
Part Number
SiP5678CS-TR—E3
Temperature Range
0 to 70_C
Marking
SiP5678CS
PIN DESCRIPTION
Pin
1, 11, 13, 15, 17,
19, 21, 23, 25, 37,
39, 41, 43, 45, 47
2, 12, 14, 16, 18,
20, 22, 24,26, 38,
40, 42, 44, 46, 48
Name
TXP; X = 1...15
TXN; X = 1...15
3 TERMPWR
4, 5, 6, 7, 8, 9, 28,
29, 30, 31, 32, 33
10
27
H/S GND
REG
GND
34 MODE
35 DIFFS
36 DISABLE
Function
Positive terminator channel pins. Provide positive signal line termination in LVD operation, and are connected to GND
through low impedance in S/E operation. In HPD, DISABLE, or power off condition these pins present high
impedance to the SCSI bus.
Negative terminator channel pins. Provide negative signal line termination in LVD operation, and line termination for
S/E operation. In HPD, DISABLE, or power off condition these pins present high impedance to the SCSI bus.
Power for the terminator IC. Connect to the TERMPWR lines on the SCSI bus and decouple with a 4.7-mF capacitor
to GND at the IC.
Heat sink ground. Should be connected to as large a grounded heat sink area on the PC board as is practical.
SCSI regulator output. Connect a 4.7-mF bypass capacitor from this pin to GND.
Electrical ground connection for the terminator IC. Connect to the ground lines of the SCSI Bus
SCSI MODE select pin. Connect to the DIFFSENS line of the SCSI bus to sense the present mode of operation on
the bus. An internal time delay filter is provided but it is recommended to decouple MODE from the DIFFSENS signal
with a 20-kW/0.1-mF anti-aliasing filter for reliable operation in noisy environments.
DIFFSENS regulator output. Connect to the DIFFSENS line of the SCSI bus to bias the mode selection function.
Chip disable. There is a small (nominal 10 mA) pull up current on this pin. Pull this pin to GND to enable bus
termination. When this pin is left floating or pulled high all SCSI channel pins present high impedance to the SCSI bus,
and the SCSI regulator and DIFFSENS regulator are both disabled.
Document Number: 73100
S-41843—Rev. A, 11-Oct-04
www.vishay.com
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Notice
Legal Disclaimer Notice
Vishay
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000
Revision: 08-Apr-05
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