SiP5668
New Product
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
D
D
D
D
D
D
Disk Array (RAID)
Storage Area Networks (SAN)
Network Attached Storage (NAS)
SCSI Cable
Server and Workstation
Industrial Computers
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 is available in a lead (Pb)-free SQFP-48 package
for operation over the temperature range of 0 to 70
_C.
The SiP5668 has fourteen (14) output channels (T1−T14).
Each output channel provides termination for one SCSI data
FUNCTIONAL BLOCK DIAGRAM
LVD
27
S/E
26
TERMPWR
3
Current Limited
Source/Sink
Regulator
1.3 V
35
DIFFS
MODE
34
Comparators
and
Delay Filter
V
t
0.5 = S/E
0.7
t
V
t1.9
= LVD
V
u
2.4 = HPD
Current Limited
Source/Sink
Regulator
SCSI
Terminator
Impedance
Circuits
2
1
T1N
T1P
10
mA
Mode Control And
Enable/Disable
Circuitry
48
47
T14N
T14P
See
Functional Diagrams
(Page 6) for detailed descriptions
of SCSI Terminator Impedance
Circuits in LVD and S/E modes of
operation.
www.vishay.com
DISABLE
36
25
GND
4
9
28
33
10
REG
Heat Sink GND Pins
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
1
SiP5668
Vishay Siliconix
TYPICAL APPLICATION DIAGRAM
New Product
SCSI BUS
TERMPWR
SiP5668
TERMPWR
T1N
T1P
DDD
Group 1 Signals
T1N
T1P
DDD
SiP5668
TERMPWR
DISABLE
T14N
T14P
T14N
T14P
DIFFSENS
20 kW
20 kW
MODE
DIFFS
DISABLE
REG
4.7
mF
GND
DIFFS
REG
GND
4.7
mF
MODE
0.1
mF
4.7
mF
0.1
mF
4.7
mF
SiP5668
TERMPWR
T1N
T1P
DDD
Group 2 Signals
T1N
T1P
DDD
SiP5668
TERMPWR
DISABLE
T13N
T13P
T13N
T13P
DIFFS
DISABLE
REG
4.7
mF
GND
DIFFS
REG
GND
4.7
mF
MODE
MODE
GROUND
Group 1 Signals:
DB(0), DB(1), DB(2), DB(3), DB(4), DB(5), DB(6), DB(7), DB(P), DB(12), DB(13), DB(14), DB(15), DB(P1)
Group 2 Signals:
ATN, BSY, ACK, RST, MSG, SEL, C/D, REQ, I/O, DB(8), DB(9), DB(10), DB(11)
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2
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
SiP5668
New Product
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
TERMPWR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
TXN, TXP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
to 6 V
MODE, DISABLE, M/S, STATUS . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
to 6 V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−65
to 125
_C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
_C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
TERMPWR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7 V to 5.25 V
Operating Temperature Range (T
A)
) . . . . . . . . . . . . . . . . . . . . . . . . 0 to 70
_C
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
Differential Impedance
Common Mode Impedance
Differential Failsafe Bias
Common Mode Bias
Limits
Min
a
100
Symbol
Z
DIFF
Z
CM
V
DIFF
V
CM
TERMPWR = 2.7 to 5.25 V, DISABLE = 0 V
T
A
= T
J
= 0 to 70
_C
Typ
b
105
140
112
1.25
Max
a
110
160
125
1.35
Unit
SCSI Channels (T1 to T14), LVD Operation
120
100
1.15
W
mV
V
MODE = 1 3 V
1.3
SCSI Channels (T1 to T14), S/E Operation
Impedance
Bias Voltage
Output Current
GND Driver Impedance
Z
S/E
V
S/E
I
S/E
Z
GS
MODE = 0 V
MODE = 0 V
Channel Voltage = 0.2 V
Channel Voltage = 0.5 V
100
2.5
−25.4
−22.4
30
60
108
2.7
−23
116
3.0
−20.5
W
V
mA
W
MODE = 0 V, I
TEST
= 10 mA
SCSI Channels (T1 to T14), Termination Disabled
Channel Leakage
c
Channel Capacitance
c, d
I
L
C
T
Channel Voltage = 0 to 5 V
Referenced to GND
−500
0
3
500
nA
pF
SCSI Regulator, LVD Mode
Output Voltage
Source Current
Sink Current
V
REG(LVD)
I
SO(LVD)
I
SI(LVD)
0.5 V
v
V
CM
v
2.0 V
e
V
REG
= 0 V
V
REG
= 4 V
1.15
−1000
200
1.25
−600
400
1.35
−400
700
V
mA
DIFFSENS Regulator
Output Voltage
Source Current
Sink Current
V
DIFFS
I
SO(DIFFS)
I
SI(DIFFS)
−5
mA
v
I
DIFFS
v
50
mA
V
DIFFS
= 0 V
V
DIFFS
= 2.75 V
1.2
−15
50
1.3
−8
100
1.4
−5
200
V
mA
mA
SCSI Regulator, S/E Mode
Output Voltage
Source Current
Sink Current
V
REG(S/E)
I
SO(S/E)
I
SI(S/E)
0.2 V
v
V
CM
v
4.0 V
f
V
REG
= 0 V
V
REG
= 4 V
2.5
−1000
200
2.7
−600
400
3.0
−400
700
V
mA
DISABLE Input
Input Threshold
Input Current
V
TH(DIS)
I
IN(DIS)
0 V
v
V
DISABLE
v
1.2 V
V
DISABLE
u
1.2 V
0.8
−30
−30
1.0
−10
0
1.2
−3
10
V
mA
MODE Input
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
www.vishay.com
3
SiP5668
Vishay Siliconix
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
MODE Input
S/E to LVD Threshold
LVD to HPD Threshold
Input Current
Mode Change Delay
V
TH(S/E)
V
TH(HPD)
I
IN(MODE)
t
DEL
0 Vv V
MODE
v
5.25 V
0.5
1.9
−1
100
0.6
2.1
0
200
0.7
2.4
1
400
V
mA
ms
New Product
Limits
Min
a
Typ
b
Max
a
Unit
Symbol
TERMPWR = 2.7 to 5.25 V, DISABLE = 0 V
T
A
= T
J
= 0 to 70
_C
STATUS Output Pins (LVD, S/E)
Source Current
Sink Current
I
SO(STAT)
I
SI(STAT)
TERMPWR = 2.7 V, V
PIN
= 2.4 V
V
PIN
= 0.4 V
3
−10
6
−5
mA
THERMAL Shutdown
Shutdown Temperature
d
Hysteresis
d
T
OFF
T
HYS
Rising Temperature
160
10
_C
TERMPWR Supply
LVD Mode
S/E Mode
HPD Mode
Disabled Mode
I
DD(LVD)
I
DD(S/E)
I
DD(HPD)
I
DD(DIS)
MODE = 1.3 V, Channels Unloaded
MODE = 0 V, Channels Unloaded
MODE = 3 V
DISABLE = 3 V
25
10
10
500
35
20
20
1000
mA
mA
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum is used in this data sheet.
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
c. MODE = 3 V and/or DISABLE = 3 V and/or TERMPWR = 0 V.
d. Guaranteed by design, not subject to production test.
e. V
CM
applied simultaneously to Line PLUS and Line MINUS pins of all SCSI channels T1-T14.
f.
V
CM
applied simultaneously to Line MINUS pins of all SCSI channels T1-T14.
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4
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
SiP5668
New Product
PIN CONFIGURATION AND ORDERING INFORMATION
TERMPWR
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
Vishay Siliconix
REG
T2N
T1N
T2P
T3P
T3N
T4P
T4N
T5P
T5N
T6P
T6N
T7P
T7N
T8P
T8N
12 11 10 9 8 7 6 5 4 3 2 1
48
13
47
14
46
15
45
16
44
17
43
18
SiP5668 (SQFP-48)
42
19
Top View
41
20
40
21
39
22
38
23
37
24
25 26 27 28 29 30 31 32 33 34 35 36
T1P
T14N
T14P
T13N
T13P
T12N
T12P
T11N
T11P
T10N
T10P
T9N
T9P
ORDERING INFORMATION
Part Number
SiP5668CS-TR—E3
Temperature Range
0 to 70_C
DISABLE
S/E
LVD
MODE
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
DIFFS
GND
Marking
SiP5668CS
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
3
4, 5, 6, 7, 8, 9, 28,
29, 30, 31, 32, 33
10
25
26, 27
34
35
36
Name
TXP; X = 1...14
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
Status output pins. Respective pins are high when the terminator detects the corresponding mode of operation on the
SCSI bus, and low otherwise.
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.
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TXN; X = 1...14
TERMPWR
H/S GND
REG
GND
S/E, LVD
MODE
DIFFS
DISABLE
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
5
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