VISHAY SIP5668

SiP5668
New Product
Vishay Siliconix
14-Line SCSI Bus Terminators
D Pin Compatible with UCC5628
D Lead (Pb)-Free SQFP-48 Package
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
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.
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.
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.
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
LVD
S/E
TERMPWR
27
26
3
35
DIFFS
2
T1N
1
T1P
48
T14N
47
T14P
Comparators
and
Delay Filter
34
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
10 mA
DISABLE
Current Limited
Source/Sink
Regulator
1.3 V
Mode Control And
Enable/Disable
Circuitry
36
25
4
GND
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
9
28
Heat Sink GND Pins
33
10
REG
See Functional Diagrams
(Page 6) for detailed descriptions
of SCSI Terminator Impedance
Circuits in LVD and S/E modes of
operation.
www.vishay.com
1
SiP5668
New Product
Vishay Siliconix
TYPICAL APPLICATION DIAGRAM
SCSI BUS
TERMPWR
SiP5668
SiP5668
T1N
TERMPWR
T1N
T1P
T1P
DDD
DDD
DISABLE
Group 1 Signals
T14N
T14P
DIFFSENS
DIFFS
REG
20 kW
GND
DISABLE
T14N
T14P
4.7 mF
TERMPWR
DIFFS
REG
20 kW
MODE
MODE
0.1 mF
0.1 mF
4.7 mF
4.7 mF
SiP5668
TERMPWR
SiP5668
T1N
T1N
T1P
T1P
REG
GND
Group 2 Signals
T13N
T13N
T13P
T13P
DIFFS
DIFFS
MODE
TERMPWR
DDD
DDD
DISABLE
4.7 mF
4.7 mF
GND
MODE
DISABLE
REG
GND
4.7 mF
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)
www.vishay.com
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 (TA)) . . . . . . . . . . . . . . . . . . . . . . . . 0 to 70 _C
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
TERMPWR = 2.7 to 5.25 V, DISABLE = 0 V
TA = TJ = 0 to 70 _C
Limits
Mina
Typb
ZDIFF
100
105
110
ZCM
120
140
160
Symbol
Maxa
Unit
SCSI Channels (T1 to T14), LVD Operation
Differential Impedance
Common Mode Impedance
Differential Failsafe Bias
VDIFF
Common Mode Bias
VCM
MODE = 1.3
13V
W
100
112
125
mV
1.15
1.25
1.35
V
100
108
116
W
2.5
2.7
3.0
V
Channel Voltage = 0.2 V
−25.4
−23
−20.5
Channel Voltage = 0.5 V
−22.4
30
60
W
0
500
nA
SCSI Channels (T1 to T14), S/E Operation
Impedance
ZS/E
Bias Voltage
VS/E
Output Current
IS/E
GND Driver Impedance
ZGS
MODE = 0 V
MODE = 0 V
MODE = 0 V, ITEST = 10 mA
mA
SCSI Channels (T1 to T14), Termination Disabled
Channel Leakagec
IL
Channel Voltage = 0 to 5 V
Channel Capacitancec, d
CT
Referenced to GND
Output Voltage
VREG(LVD)
0.5 V v VCM v 2.0 Ve
1.15
1.25
1.35
Source Current
ISO(LVD)
VREG = 0 V
−1000
−600
−400
Sink Current
ISI(LVD)
VREG = 4 V
200
400
700
Output Voltage
VDIFFS
−5 mA v IDIFFS v 50 mA
1.2
1.3
1.4
V
Source Current
ISO(DIFFS)
VDIFFS = 0 V
−15
−8
−5
mA
Sink Current
ISI(DIFFS)
VDIFFS = 2.75 V
50
100
200
mA
Output Voltage
VREG(S/E)
0.2 V v VCM v 4.0 Vf
2.5
2.7
3.0
V
Source Current
ISO(S/E)
VREG = 0 V
−1000
−600
−400
Sink Current
ISI(S/E)
VREG = 4 V
200
400
700
0.8
1.0
1.2
0 V v VDISABLE v 1.2 V
−30
−10
−3
VDISABLE u 1.2 V
−30
0
10
−500
3
pF
SCSI Regulator, LVD Mode
V
mA
DIFFSENS Regulator
SCSI Regulator, S/E Mode
mA
DISABLE Input
Input Threshold
Input Current
VTH(DIS)
IIN(DIS)
V
mA
MODE Input
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
www.vishay.com
3
SiP5668
New Product
Vishay Siliconix
SPECIFICATIONS
Test Conditions Unless Specified
Parameter
Symbol
TERMPWR = 2.7 to 5.25 V, DISABLE = 0 V
TA = TJ = 0 to 70 _C
Limits
Mina
Typb
Maxa
Unit
MODE Input
S/E to LVD Threshold
VTH(S/E)
0.5
0.6
0.7
LVD to HPD Threshold
VTH(HPD)
1.9
2.1
2.4
Input Current
IIN(MODE)
Mode Change Delay
0 Vv VMODE v 5.25 V
tDEL
V
−1
0
1
mA
100
200
400
ms
−10
−5
STATUS Output Pins (LVD, S/E)
Source Current
ISO(STAT)
TERMPWR = 2.7 V, VPIN = 2.4 V
Sink Current
ISI(STAT)
VPIN = 0.4 V
Shutdown Temperatured
TOFF
Rising Temperature
Hysteresis d
THYS
3
6
mA
THERMAL Shutdown
160
_C
10
TERMPWR Supply
LVD Mode
IDD(LVD)
MODE = 1.3 V, Channels Unloaded
25
35
S/E Mode
IDD(S/E)
MODE = 0 V, Channels Unloaded
10
20
HPD Mode
IDD(HPD)
MODE = 3 V
10
20
Disabled Mode
IDD(DIS)
DISABLE = 3 V
500
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. VCM applied simultaneously to Line PLUS and Line MINUS pins of all SCSI channels T1-T14.
f.
VCM applied simultaneously to Line MINUS pins of all SCSI channels T1-T14.
www.vishay.com
4
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
SiP5668
New Product
Vishay Siliconix
T1N
TERMPWR
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
REG
T1P
T14N
T14P
T13N
T13P
T12N
T12P
T11N
T11P
T10N
T10P
T9N
T9P
DISABLE
GND
T8N
DIFFS
T8P
MODE
T7N
H/S GND
T7P
H/S GND
T6N
H/S GND
T6P
H/S GND
T5N
H/S GND
T5P
H/S GND
T4N
LVD
T4P
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
S/E
T3P
T3N
T2P
T2N
PIN CONFIGURATION AND ORDERING INFORMATION
ORDERING INFORMATION
Part Number
Temperature Range
Marking
SiP5668CS-TR—E3
0 to 70_C
SiP5668CS
PIN DESCRIPTION
Pin
Name
Function
1, 11, 13, 15, 17,
19, 21, 23, 25, 37,
39, 41, 43, 45, 47
TXP; X = 1...14
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.
2, 12, 14, 16, 18,
20, 22, 24,26, 38,
40, 42, 44, 46, 48
TXN; X = 1...14
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.
3
TERMPWR
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.
4, 5, 6, 7, 8, 9, 28,
29, 30, 31, 32, 33
H/S GND
Heat sink ground. Should be connected to as large a grounded heat sink area on the PC board as is practical.
10
REG
SCSI regulator output. Connect a 4.7-mF bypass capacitor from this pin to GND.
25
GND
Electrical ground connection for the terminator IC. Connect to the ground lines of the SCSI Bus
26, 27
S/E, LVD
Status output pins. Respective pins are high when the terminator detects the corresponding mode of operation on the
SCSI bus, and low otherwise.
34
MODE
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.
35
DIFFS
DIFFSENS regulator output. Connect to the DIFFSENS line of the SCSI bus to bias the mode selection function.
36
DISABLE
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
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.
www.vishay.com
5
SiP5668
New Product
Vishay Siliconix
FUNCTIONAL BLOCK DIAGRAMLVD OPERATION
LVD
S/E
27
26
Current Limited
Source/Sink
Regulator
1.3 V
35
DIFFS
2
T1N
1
T1P
48
T14N
47
T14P
35
DIFFS
2
T1N
1
T1P
48
T14N
47
T14P
Comparators
MODE
34
V t 0.5 = S/E
0.7 t V t1.9 = LVD
V u 2.4 = HPD
Current Limited
Source/Sink
Regulator
52.5 W
115 W
52.5 W
1.25 V
1.07 mA
10 mA
DISABLE
Mode Control And
Enable/Disable
Circuitry
36
1.07 mA
52.5 W
1.07 mA
115 W
52.5 W
1.07 mA
10
REG
FUNCTIONAL BLOCK DIAGRAMS/E OPERATION
LVD
S/E
34
33
Current Limited
Source/Sink
Regulator
1.3 V
Comparators
MODE
34
V t 0.5 = S/E
0.7 t V t1.9 = LVD
V u 2.4 = HPD
Current Limited
Source/Sink
Regulator
108 W
2.7 V
30 W
10 mA
DISABLE
36
108 W
Mode Control And
Enable/Disable
Circuitry
30 W
10
REG
www.vishay.com
6
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
SiP5668
New Product
Vishay Siliconix
LVD WAVEFORMS
160 Mbyte/sec data transfer. Top panel DB10 T- and T+ signals. Bottom panel DB9 T− and T+ signals. All bits except DB9
toggling at maximum data rate.
TEMPWR = 2.70 V
0.1 V/div
0.1 V/div
TEMPWR = 5.25 V
5 ns/div
5 ns/div
S/E WAVEFORMS
40 Mbyte/sec data transfer. Top panel DB10 T- signals. Bottom panel DB9 T− signals.
50 ns/div
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
TEMPWR = 2.70 V
0.5 V/div
0.5 V/div
TEMPWR = 5.25 V
50 ns/div
www.vishay.com
7
SiP5668
New Product
Vishay Siliconix
LVD TYPICAL CHARACTERISTICS
Differential Impedance vs. TERMPWR
0_C
25_C
70_C
Differential Impedance (W)
108
TERMPWR
5.25 V
3.5 V
2.7 V
108
106
104
102
100
2.5
Differential Impedance vs. Temperature
110
Differential Impedance (W)
110
106
104
102
100
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
30
40
50
60
70
Temperature (_C)
Differential Fail-Safe Bias vs. TERMPWR
Differential Fail-Safe Bias vs. Temperature
125
125
0_C
25_C
70_C
115
110
105
100
2.5
TERMPWR
5.25 V
3.5 V
2.7 V
120
Differential Bias (mV)
Differential Bias (mV)
120
115
110
105
100
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
TERMPWR (V)
Common Mode Bias vs. TERMPWR
1.29
Common Mode Bias (V)
1.25
1.24
1.23
1.27
1.26
1.25
TERMPWR
5.25 V
3.5 V
2.7 V
1.24
1.23
1.22
1.22
1.21
1.21
1.20
3.0
3.5
4.0
4.5
TERMPWR (V)
8
70
1.28
1.26
www.vishay.com
60
1.29
1.27
1.20
2.5
50
Common Mode Bias vs. Temperature
1.30
0_C
25_C
70_C
1.28
40
Temperature (_C)
Common Mode Bias (V)
1.30
30
5.0
5.5
0
10
20
30
40
50
60
70
Temperature (_C)
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
SiP5668
New Product
Vishay Siliconix
SE TYPICAL CHARACTERISTICS
Impedance vs. TERMPWR
116
0_C
25_C
70_C
114
112
110
108
106
110
108
106
104
104
102
102
100
2.5
TERMPWR
5.25 V
3.5 V
2.7 V
114
Impedance (W)
Impedance (W)
112
Impedance vs. Temperature
116
100
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
TERMPWR (V)
Output Current @ 0.2 V vs. TERMPWR
0_C
25_C
70_C
−21.9
−21.9
−22.4
Current (mA)
Current (mA)
60
70
TERMPWR
5.25 V
3.5 V
2.7 V
−21.4
−22.4
−22.9
−23.4
−23.9
−22.9
−23.4
−23.9
−24.4
−24.4
−24.9
−24.9
−25.4
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
TERMPWR (V)
40
50
60
70
60
70
Bias vs. Temperature
3.0
0_C
25_C
70_C
2.9
30
Temperature (_C)
Bias vs. TERMPWR
3.0
TERMPWR
5.25 V
3.5 V
2.7 V
2.9
2.8
Bias (V)
Bias (V)
50
−20.9
−21.4
2.7
2.6
2.5
2.5
40
Output Current @ 0.2 V vs. Temperature
−20.9
−25.4
2.5
30
Temperature (_C)
2.8
2.7
2.6
2.5
3.0
3.5
4.0
4.5
TERMPWR (V)
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
5.0
5.5
0
10
20
30
40
50
Temperature (_C)
www.vishay.com
9
SiP5668
Vishay Siliconix
New Product
DETAILED OPERATION
The SiP5668 is a multimode active terminator IC, which
detects the operating mode of the SCSI bus, and switches to
the appropriate termination configuration accordingly.
Two SiP5668 terminators are required at each end of a wide
SCSI bus to terminate 27 lines (18 data, 9 control). In LVD
mode the SiP5668 provides 105-Ω differential impedance and
112-mV differential bias between each TN/TP pair of
terminator lines. In S/E mode the SiP5668 provides 108-Ω
impedance and 2.7-V pull-up on each TxN pin, and low
impedance to ground on each TxP pin. In HPD mode the
SiP5668 disconnects from the bus and presents high
impedance to all TN/TP lines.
Each SiP5668 IC has a 1.3-V DIFFSENS regulator output that
can be used to drive the DIFFSENS line of a SCSI bus. The
DIFFSENS regulator attempts to drive the DIFFSENS control
signal to 1.3 V, but is current limited so that S/E or HPD devices
on the SCSI bus can override the DIFFSENS regulator and put
the bus into S/E or HPD mode of operation.
The MODE pin senses the operational state of the SCSI bus
by detecting the voltage on the DIFFSENS control line. There
is an integrated 200-ms glitch filter on the MODE imput for
reliable operation in noisy environments.
On power up, the SiP5668 initially defaults to a high
impedance state on the termination pins. If the MODE pin
detects S/E or LVD level on the DIFFSENS signal of the SCSI
bus the SiP5668 will wait a standard delay (200 ms typical)
before changing its operating mode. During regular operation
if the MODE pin detects another bus mode change the
SiP5668 again waits a standard delay before changing its
operating mode. This mode change delay is implemented in
accordance with SCSI standards SPI-3 and higher.
Two status lines (S/E and LVD) are provided by the SiP5668.
One and only one status line is asserted HIGH when its
corresponding mode has been detected; the other status line
is driven low. Both status lines are driven low when HPD mode
is detected.
The DISABLE pin is used to connect/disconnect the SiP5668.
If it is pulled to GROUND the SiP5668 is in connect mode, and
operates as a terminator. If it is pulled to TRMPWR or left open
the device is in disconnect mode and presents high
impedance to the SCSI bus. In disconnect mode the
DIFFSENS Regulator is disabled but the mode detection
circuitry continues to function and the status lines continue to
indicate which mode is detected.
The SiP5668 operates within SCSI specifications with the
TERMPWR voltage between 2.7 V and 5.25 V, which enables
it to operate in both 5-V and 3.3-V systems. The 2.7-V lower
limit guarantees correct performance in a 3.3-V system.
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and
Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see
http://www.vishay.com/ppg?73099.
www.vishay.com
10
Document Number: 73099
S-41843—Rev. A, 11-Oct-04
Legal Disclaimer Notice
Vishay
Notice
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
www.vishay.com
1