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SIP5678
New Product
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 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 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 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 10 mA Mode Control And Enable/Disable Circuitry
2 1 SCSI Terminator Impedance Circuits 48 47
T1N T1P
T15N T15P 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
27 GND
4
9
28
33
10 REG
Heat Sink GND Pins
Document Number: 73100 S-41843--Rev. A, 11-Oct-04
1
SIP5678
Vishay Siliconix
TYPICAL APPLICATION DIAGRAM
New Product
SCSI BUS TERMPWR
SIP5678
TERMPWR T1N T1P DDD Group 1 Signals T1N T1P DDD
SIP5678
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
SIP5678
TERMPWR T1N T1P DDD Group 2 Signals T1N T1P DDD
SIP5678
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: 73100 S-41843--Rev. A, 11-Oct-04
SIP5678
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
Differential Impedance Common Mode Impedance Differential Failsafe Bias Common Mode Bias
Limits Mina
100
Symbol
ZDIFF ZCM VDIFF VCM
TERMPWR = 2.7 to 5.25 V, DISABLE = 0 V TA = TJ = 0 to 70 _C
Typb
105 140 112 1.25
Maxa
110 160 125 1.35
Unit
SCSI Channels (T1 to T15), LVD Operation
120 100 1.15 W mV V
MODE = 1 3 V 1.3
SCSI Channels (T1 to T15), S/E Operation
Impedance Bias Voltage Output Current GND Driver Impedance ZS/E VS/E IS/E ZGS 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, ITEST = 10 mA
SCSI Channels (T1 to T15), Termination Disabled
Channel Leakagec Channel Capacitancec, d IL CT 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 VREG(LVD) ISO(LVD) ISI(LVD) 0.5 V v VCM v 2.0 Ve VREG = 0 V VREG = 4 V 1.15 -1000 200 1.25 -600 400 1.35 -400 700 V mA
SCSI Regulator, S/E Mode
Output Voltage Source Current Sink Current VREG(S/E) ISO(S/E) ISI(S/E) 0.2 V v VCM v 4.0 Vf VREG = 0 V VREG = 4 V 2.5 -1000 200 2.7 -600 400 3.0 -400 700 V mA
DIFFSENS Regulator
Output Voltage Source Current Sink Current VDIFFS ISO(DIFFS) ISI(DIFFS) -5 mA v IDIFFS v 50 mA VDIFFS = 0 V VDIFFS = 2.75 V 1.2 -15 50 1.3 -8 100 1.4 -5 200 V mA mA
DISABLE Input
Input Threshold Input Current VTH(DIS) IIN(DIS) 0 V v VDISABLE v 1.2 V VDISABLE u 1.2 V 0.8 -30 -30 1.0 -10 0 1.2 -3 10 V mA
Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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SIP5678
Vishay Siliconix
SPECIFICATIONS
Test Conditions Unless Specified Parameter MODE Input
S/E to LVD Threshold LVD to HPD Threshold Input Current Mode Change Delay VTH(S/E) VTH(HPD) IIN(MODE) tDEL 0 Vv VMODE 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 Mina Typb Maxa Unit
Symbol
TERMPWR = 2.7 to 5.25 V, DISABLE = 0 V TA = TJ = 0 to 70 _C
THERMAL Shutdown
Shutdown Temperatured Hysteresis d TOFF THYS Rising Temperature 160 10 _C
TERMPWR Supply
LVD Mode S/E Mode HPD Mode Disabled Mode IDD(LVD) IDD(S/E) IDD(HPD) IDD(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. VCM applied simultaneously to Line PLUS and Line MINUS pins of all SCSI channels T1-T15. f. VCM applied simultaneously to Line MINUS pins of all SCSI channels T1-T15.
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Document Number: 73100 S-41843--Rev. A, 11-Oct-04
SIP5678
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 SIP5678 (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
T15N T15P T14N T14P T13N T13P T12N T12P T11N T11P T10N T10P
ORDERING INFORMATION
Part Number
SIP5678CS-TR--E3
Temperature Range
0 to 70_C
DISABLE
MODE
T9P
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
H/S GND
DIFFS
T9N
GND
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 3 4, 5, 6, 7, 8, 9, 28, 29, 30, 31, 32, 33 10 27 34 35 36
Name
TXP; X = 1...15
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. www.vishay.com
TXN; X = 1...15 TERMPWR H/S GND REG GND MODE DIFFS DISABLE
Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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SIP5678
Vishay Siliconix
FUNCTIONAL BLOCK DIAGRAM
New Product
LVD OPERATION
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
35
DIFFS
Current Limited Source/Sink Regulator 1.25 V
52.5 W 115 W 52.5 W
1.07 mA 2 1 T1N T1P
10 mA Mode Control And Enable/Disable Circuitry 115 W 52.5 W
1.07 mA
DISABLE
36
52.5 W
1.07 mA 48 47 1.07 mA T15N T15P
10 REG
FUNCTIONAL BLOCK DIAGRAM
S/E OPERATION
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
35
DIFFS
Current Limited Source/Sink Regulator 2.7 V
108 W 30 W
2 1
T1N T1P
10 mA Mode Control And Enable/Disable Circuitry 108 W
DISABLE
36
48 30 W 47
T15N T15P
10 REG www.vishay.com Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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SIP5678
New Product
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.
Vishay Siliconix
TEMPWR = 5.25 V
TEMPWR = 2.70 V
0.1 V/div
5 ns/div
0.1 V/div
5 ns/div
S/E WAVEFORMS
40 Mbyte/sec data transfer. Top panel DB10 T- signals. Bottom panel DB9 T- signals.
TEMPWR = 5.25 V
TEMPWR = 2.70 V
0.5 V/div
50 ns/div
0.5 V/div
50 ns/div
Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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SIP5678
Vishay Siliconix
LVD TYPICAL CHARACTERISTICS
110
New Product
Differential Impedance vs. TERMPWR
0_C 25_C 70_C
110
Differential Impedance vs. Temperature
TERMPWR 5.25 V 3.5 V 2.7 V
108 Differential Impedance (W)
108 Differential Impedance (W)
106
106
104
104
102
102
100 2.5
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
125 0_C 25_C 70_C Differential Bias (mV) 125
Differential Fail-Safe Bias vs. Temperature
TERMPWR 5.25 V 3.5 V 2.7 V
120 Differential Bias (mV)
120
115
115
110
110
105
105
100 2.5
100 3.0 3.5 4.0 4.5 5.0 5.5 0 10 20 30 40 50 60 70 TERMPWR (V) Temperature (_C)
1.30 1.29 1.28 Common Mode Bias (V) 1.27 1.26 1.25 1.24 1.23 1.22 1.21 1.20 2.5
Common Mode Bias vs. TERMPWR
0_C 25_C 70_C
1.30 1.29 1.28 Common Mode Bias (V) 1.27 1.26 1.25 1.24 1.23 1.22 1.21 1.20
Common Mode Bias vs. Temperature
TERMPWR 5.25 V 3.5 V 2.7 V
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
30
40
50
60
70
TERMPWR (V) www.vishay.com
Temperature (_C) Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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SIP5678
New Product
SE TYPICAL CHARACTERISTICS
116 114 112 Impedance (W) 110 108 106 104 102 100 2.5
Vishay Siliconix
Impedance vs. TERMPWR
0_C 25_C 70_C Impedance (W)
116 114 112 110 108 106 104 102 100
Impedance vs. Temperature
TERMPWR 5.25 V 3.5 V 2.7 V
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
30
40
50
60
70
TERMPWR (V)
Temperature (_C)
Output Current @ 0.2 V vs. TERMPWR
-20.9 -21.4 -21.9 -22.4 -22.9 -23.4 -23.9 -24.4 -24.9 -25.4 2.5 Current (mA) Current (mA) 0_C 25_C 70_C -20.9 -21.4 -21.9 -22.4 -22.9 -23.4 -23.9 -24.4 -24.9 -25.4 3.0 3.5 4.0 4.5 5.0 5.5 0
Output Current @ 0.2 V vs. Temperature
TERMPWR 5.25 V 3.5 V 2.7 V
10
20
30
40
50
60
70
TERMPWR (V)
Temperature (_C)
3.0
Bias vs. TERMPWR
0_C 25_C 70_C
3.0
Bias vs. Temperature
TERMPWR 5.25 V 3.5 V 2.7 V
2.9
2.9
Bias (V)
2.7
Bias (V)
2.8
2.8
2.7
2.6
2.6
2.5 2.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 10 20 30 40 50 60 70
TERMPWR (V)
Temperature (_C)
Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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SIP5678
Vishay Siliconix
New Product
DETAILED OPERATION
The SIP5678 is a multimode active terminator IC, which detects the operating mode of the SCSI bus, and switches to the appropriate termination configuration accordingly. Two SIP5678 terminators are required at each end of a wide SCSI bus to terminate 27 lines (18 data, 9 control). In LVD mode the SIP5678 provides 105-W differential impedance and 112-mV differential bias between each TN/TP pair of terminator lines. In S/E mode the SIP5678 provides 108-W impedance and 2.7-V pull-up on each TxN pin, and low impedance to ground on each TxP pin. In HPD mode the SIP5678 disconnects from the bus and presents high impedance to all TN/TP lines. Each SIP5678 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 glich filter on the MODE input for reliable operation in a noisy environments. On power up, the SIP5678 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 SIP5678 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 SIP5678 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. The DISABLE pin is used to connect/disconnect the SIP5678. If it is pulled to GROUND the SIP5678 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. The SIP5678 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?73100. www.vishay.com Document Number: 73100 S-41843--Rev. A, 11-Oct-04
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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
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