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SS8218
Ultra160 Multi-mode LVD/SE SCSI Terminator
Features
Auto-selectable multi-mode Single-Ended or LVD Termination Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra (Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3 LVD) standards. Supports active negation 3pF channel capacitance Thermal protection Hot-swap compatible 5% tolerance on SE and LVD termination resistance 28 and 36 pin SSOP package 28 Pin SSOP: Pin Compatible with DS2119 36 Pin SSOP: Pin Compatible with DS2118, LX5241 and UCC5630
General Description
The SS8218 Multi-mode LVD/SE SCSI terminator provides a smooth transition to the next generation of the SCSI Parallel Interface (SPI-3). It automatically senses the bus, via DIFFSENS, and switches the termination to either single-ended (SE) or low voltage differential (LVD) SCSI, dependent on which type of devices are connected to the bus. If the SS8218 detects a HVD SCSI device, it switches to a high impedance state. For a 16-bit Wide SCSI bus to be operational, three SS8218 terminators are needed. The Multi-mode terminator contains all functions required to terminate and auto detect and switch modes for SCSI Parallel Interface (SPI) bus architectures. For the SE termination, one regulator and nine precision 110ohm resistors are used. For the LVD termination, the SS8218 integrates 18 regulated supplies with nine precision resistor strings.
Applications
Server and workstation High-end PC Industrial PC Disk Array (RAID) SCSI cable
Pin Configuration
VREF NC NC R1+ VREF R1+ R1R2+ R2NC/HS GND R3+ R3R4+ R4R5+ R5DISCNCT GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TPWR TPWR R9NC/HS GND R9+ R8R8+ NC/HS GND R7R7+ R6R6+ DIFFB DIFFSENSE M/S R1R2+ R2HS/GND HS/GND HS/GND R3+ R3R4+ R4R5+ R5DISCNCT GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 TPWR HVD LVD SE R9R9+ R8R8+ HS/GND HS/GND HS/GND R7R7+ R6R6+ DIFFB DIFFSENSE M/S
28Pin SSOP/TSSOP
36Pin SSOP
Rev.2.01 6/06/2003
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SS8218
Ordering Information
PART NUMBER
SS8218-S4TB SS8218-S4TR SS8218-S5TB SS8218-S5TR SS8218-D3TB SS8218-D3TR
TEMP. RANGE
0C-70C 0C-70C 0C-70C 0C-70C 0C-70C 0C-70C
PIN-PACKAGE
SSOP-28 pin / Tube SSOP-28 pin / Tape & Reel SSOP-36 pin / Tube SSOP-36 pin / Tape & Reel TSSOP-28 pin / Tube TSSOP-28 pin / Tape & Reel
FEATURE
DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF
Note: DIFFSENSRefers to the SCSI bus signal. DIFFSENSERefers to the SS8218 pin name and internal circuitry relating to differential sensing. DIFFBRefers to the SS8218 pin name and internal circuitry relating to monitoring the DIFFSENS line.
Functional Description
The SS8218 is used in multi-mode active termination applications, where single ended (SE) and low voltage differential (LVD) devices might coexist. The LVD termination section consists of 18 source/sink amplifiers (VTOP, VBOT), biasing circuitry and nine precision resistor strings (RTOP, RMID, RBOT). The SE termination section consists of a 2.85V source/sink regulator with 9 precision 110ohm resistor. The DIFFSENSE section consists of a 1.3V, 5mA driver and a sensing circuit (Figure 1) DIFFSENS is used to identify which types of SCSI devices are present on the bus. If the voltage on DIFFSENS is between 0-0.5V the bus is single-ended; if it is between 0.7-1.9V the bus is LVD; and if it is greater than 2.4V, the bus is HVD. The SS8218 DIFFB pin monitors the DIFFSENS line to determine the proper operating mode of the device; this mode is indicated by the SE/LVD/HVD outputs. HVD Isolation Mode The SS8218 identifies that there is an HVD (high voltage differential) device on the SCSI bus and isolates the termination pins from the bus. When DISCNCT is pulled high, the termination pins are isolated from the SCSI bus, and the bus mode indicators (SE/LVD/HVD) as well as VREF remains active. During thermal shutdown, the termination pins are isolated from the SCSI bus and VREF becomes high impedance. The DIFFSENSE driver is shut down during either of these two events. To ensure proper operation, the TPWR pin should be connected to the SCSI bus TERMPWR line. As with all analog circuitry, the TERMPWR lines should be bypassed locally. A 2.2F capacitor and a 0.01F high frequency capacitor is recommended between TPWR
and ground and placed as close as possible to the SS8218. The 8218 should be placed as close as possible to the SCSI connector to minimize signal and power trace length, thereby resulting in less input capacitance and reflections which can degrade the bus signals. The DIFFSENSE pin can drive the SCSI DIFFSENS line (when M/S is pulled high) to determine the SCSI bus operating mode. The SS8218 switches to the termination mode that is appropriate for the bus based on the value of the DIFFSENS voltage. These modes are: LVD mode LVD termination is provided by a precision resistor string with two amplifiers. This configuration yields a 105 differential and 150 common mode impedance. A fail safe bias of 112mV is maintained when no drivers are connected to the SCSI bus. SE mode When the external driver for a given signal line turns off, the active terminator will pull that signal line to 2.85 volts (quiescent state). When used with an active negation driver, the power amp can sink 22mA per line while keeping the voltage reference in regulation. The terminating resistors maintain their 110 value. To maintain the specified regulation, a 4.7F capacitor is required between the VREF pin and ground of each SS8218. A high frequency cap (0.1F ceramic recommended) can also be placed on the VREF pin in applications that use fast rise/fall time drivers. A typical SCSI bus configuration is shown in Figure2. An internal pull down resistor assures that the SS8218 will be terminating the bus if the DISCNCT pin is left floating.
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SS8218
Block Diagram
(Figure 1)
( 36pin SSOP only ) M/S DIFFSENSE SE LVD HVD DISCNCT
THERMAL SHUTDOWN CIRCUITRY
DIFFSENSE CIRCUITRY VREF VREF 110 Ohms
CONTROL LOGIC
DIFFB
R1-
R9110 Ohms
REFERENCE GENERATION
+ _
VTOP1
X9 RTOP1 R1-
RTOP9
R1R9R9-
RMID1 R1+
RMID9 R1+ R9+ R9+
RBOT1 + _
RBOT9
VBOT1
X9 SE GND DRIV ER
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SS8218
SCSI Bus Configuration (Figure 2)
TERMPWR 2.2F TPWR M/S DISCNCT
CONTROL LINES (9) TPWR M/S DISCNCT
TERMPWR 2.2F
SS8218
SS8218
DIFFSENSE VREF DIFFB 20K 4.7F 0.1F
DIFFSENS
DIFFSENSE DIFFB VREF 20K 0.1F 4.7F
2.2F
TPWR M/S DISCNCT
DATA LINES (9)
TPWR M/S DISCNCT
2.2F
SS8218
SS8218
VREF
DIFFB
DIFFB
VREF
4.7F 2.2F TPWR M/S DISCNCT DATA LINES (9)
4.7F TPWR M/S DISCNCT 2.2F
SS8218
SS8218
VREF
DIFFB
DIFFB
VREF
4.7F
4.7F
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SS8218
Recommended Operating Conditions
PARAMETER
Termpower Voltage Logic 0 Logic 1 Operating Temperature
SYMBOL
Vtpwr (SE) Vtpwr (LVD) Vil Vih Tamb
MIN
4.0 2.9 -0.3 2.0 0
TYP
5 5
MAX
5.5 5.5 +0.8 Vtpwr+0.3 70
UNITS
V V V C
Electrical Characteristics
Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0CTA70C. PARAMETER
LVD Terminator Section Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias Common Mode Bias Single Ended Terminator Section Output Capacitance SE Termination Resistance SE Voltage Reference SE output Current Regulator Section Line Regulation Load Regulation Current Limit Sink Current DC Section Termpower Current Input Leakage High Input Leakage Low Output Current High Output Current Low DIFFSENS Section DIFFSENS SE Operating Range DIFFSENS LVD Operating Range DIFFSENS HVD Operating Range DIFFSENSE Driver Output Voltage DIFFSENSE Driver Source Current DIFFSENSE Driver Sink Current Itpmr Iih Iil Ioh Iol Vseor Vlvdor Vhvdor Vdso Idsh Idsl M/S=1; Ids = 0-5mA M/S = 1; Vdso=0V M/S=1; Vdso=2.75V SE mode (No Load) LVD mode (No Load) -1.0 1.0 Vout = 2.4 volts;SE/LVD/HVD Pins only Vout=0.4 volts;SE/LVD/HVD Pins only -1.0 4.0 -0.3 0.7 2.4 1.2 5 20 0.5 1.9 Vtpwr+0.3 1.4 15 200 4 20 mA A A mA mA V V V V mA A
SYMBOL
Rdm Rcm Vdm Vcm Cout Rse Vref Iose LIREG LOREG ILIM ISINK
Condition
MIN
100
TYP
105 150 112 1.25
MAX
110 190 125 1.375 3 115.5 2.93 25.4 2.5 3.5
UNITS
Ohms Ohms mV V pF Ohms Volts mA % % mA mA
All lines Open
110 100 1.125
Note Vline = 0-3.0 volts Vline = 0.2 volts
104.5 2.79
110 2.85
1.0 1.3 350 200
Note: Guaranteed by Design.
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SS8218
Common Mode Bias Vcm - Vtpwr 1.375 1.325 T=80C Vcm(V) 1.375 1.325 1.275 1.225 1.175 1.125 2.5 3.5 4.5 Vtpwr 5.5 -20 0 20 40 60 80 Temperature() 100 Vtpwr=2.8V Vtpwr=5.8V Common Mode Bias Vcm Temperature
Vcm(V)
1.275 1.225 1.175 1.125 T=-10C
Differential Mode Bias Vdm - Vtpwr 0.125 0.12 T=-10C Vdm(V) Vdm(V) 0.115 0.11 T=80C 0.105 0.1 2.5 3.5 4.5 Vtpwr 5.5 0.105 0.1 -20 0.115 0.11 0.125 0.12
Differential Mode Bias Vdm Temperature @Vtpwr=5V
0
20 40 60 Temperature(C)
80
100
Common Mode Termination Resistance Rcm - Vtpwr@Temperature=24C 190 180 170 Rcm(Ohm) Rcm(Ohm) 2.5 3.5 4.5 Vtpwr 5.5 160 150 140 130 120 110
Common Mode Termination Resistance Rcm - Temperature@Vtpwr=5V
190 180 170 160 150 140 130 120 110 -20 0 20 40 60 80 Temperature(C) 100
Differential Mode Termination Resistance Rdm - Vtpwr 110 108 Rdm(Ohm) Rdm(Ohm) 106 104 102 100 2.5 T=-10C 3.5 4.5 Vtpwr 5.5
Differential Mode Termination Resistance Rdm - Temperature 110 108 106 104 102 100 -20 0 Vtpwr=5.8V 20 40 60 Temperature(C) 80 100 Vtpwr=2.8V
T=80C
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SE Termination Resistance Rse - Vtpwr @T=24C;Vline=0V 115 114 113 112 111 110 109 108 107 106 105 3.5 4.5 Vtpwr 5.5
SE Termination Resistance Rse - Vtpwr @Vline=0V 115 114 113 Vtpwr=3.8V 112 111 110 109 108 107 Vtpwr=5.8V 106 105 -20 0 20 40 60 80 100 Temperature(C)
Rse(Ohm)
SE Termination Resistance Rse - Vtpwr @Vtpwr=5V;T=24C 115 114 113 112 111 110 109 108 107 106 105 0 1 2 3 Vline
Rse(Ohm)
Vref - Ivref@Vtpwr=5V;T=24C 2.93 2.91 2.89 Vref 2.87 2.85 2.83 2.81 2.79 -250 -150 -50 50 150 Ivref(mA) 250 350
Rse(Ohm)
Vref - Temperature@Ivref=0mA 2.93 2.91 2.89 Vref Vref 2.87 2.85 2.83 2.81 2.79 -20 0 20 40 60 Temperature(C) 80 100 Vtpwr=3.8V Vtpwr=5.8V 2.93 2.91 2.89 2.87
Vref - Vtpwr@T=24C
Ivref=-200mA 2.85 2.83 2.81 2.79 3.5 4.5 Vtpwr 5.5 6.5 Ivref=350mA
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Pin Description
PIN
1 2-5,7-12, 18-21, 23-26 6,22 13 14 15 16 17 27,28 VREF*
(for 28pin SSOP/TSSOP) DESCRIPTION
Reference Voltage. 2.85-volt reference; must be connected to a 4.7F capacitor. Signal Termination. (X=1,2,3,.....9) Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus. Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI bus.
SYMBOL
Rx+, Rx-
NC/ HS GND No Connect/ HS GND. Should be grounded for heat sinking purpose. DISCNCT Disconnect. When pulled high, the SS8218 isolates its bus pins (Rx+, Rx-) from the SCSI bus. GND Ground. Terminator ground pin. Connected to ground. Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the M/S DIFFSENSE driver. DIFFSENSE Output to drive the SCSI bus DIFFSENS line. DIFFB pin should be connected to a 0.1F capacitor to GND and 20k resistor to SCSI/Bus DIFFB DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI bus. TPWR Terminator Power. Connect to the SCSI TERMPWR line and de-couple with a 2.2F capacitor.
*The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed.
(36pin SSOP) PIN
1 2,3 4-7,11-16, 22-25, 29-32 8, 9,10,26, 27,28 17 18 19 20 21 33 34 35 36
SYMBOL
VREF* NC Rx+ RxHS/GND DISCNCT GND
DESCRIPTION
Reference Voltage. 2.85-volt reference; must be connected to a 4.7F capacitor. No Connect. Do not connect these pins. Signal Termination. (X=1,2,3,.....9) Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus. Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI bus. Heat Sink Ground. Connect to large area PC board traces to increase power dissipation capability. Disconnect. When pulled high, the SS8218 isolates its bus pins (Rx+, Rx-) from the SCSI bus.
Ground. Terminator ground pin. Connected to ground. Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the M/S DIFFSENSE driver. DIFFSENSE Output to drive the SCSI bus DIFFSENS line. DIFFB pin should be connected to a 0.1F capacitor to GND and 20k resistor to SCSI/Bus DIFFB DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI bus. SE LVD HVD TPWR Single ended mode indicator. It is HIGH when terminator is operating in SE mode. Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode. High Voltage Differential mode indicator. It is HIGH when terminator is operating in HVD mode Terminator Power. Connect to SCSI bus TERMPWR line and decouple with 2.2F capacitor.
*The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed.
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SS8218
Package Information (28 pin SSOP)
0.25
C
D 28
L
E1
E
1.00 REF
1
A2 A1 b e
A
Symbol
A A1 A2 b C D E E1 e L y
Min.
1.35 0.10 ----0.20 0.19 9.80 5.80 3.80 ----0.40 ----0
Dimension in mm Typ.
1.60 ----1.45 0.25 ----------------0.64 -------------
Max.
1.75 0.25 ----0.30 0.25 10.00 6.20 4.00 ----1.27 0.10 8
Min.
0.053 0.004 ----0.008 0.007 0.386 0.228 0.150 ----0.016 ----0
Dimension in inch Typ.
0.064 ----0.057 0.010 ----------------0.025 -------------
Max.
0.069 0.010 ----0.012 0.010 0.394 0.244 0.157 ----0.050 0.004 8
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36 pin SSOP
C
L
E1 E
h x 45
D
A 0.004 C SEATING PLANE e b A1
Symbol
A A1 b c D e E E1 h L
Min.
2.413 0.203 0.300 0.127 15.748 10.033 7.391 0.381 0.508 0
Dimension in mm Typ.
2.591 0.305
Max.
2.794 0.406 0.450 0.254 16.002 10.668 7.595 0.635 1.016 8
Min.
0.095 0.008 0.012 0.005 0.620 0.395 0.291 0.015 0.020 0
Dimension in inch Typ.
0.102 0.012
Max.
0.110 0.016 0.018 0.010 0.630 0.420 0.289 0.025 0.040 8
15.875 0.800 BASIC 7.493
0.625 0.032 BASIC 0.295
Taping Specification
Feed Direction Typical SSOP, TSSOP Package Orientation
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SS8218
28 pin TSSOP
D 28
C
L
E1
E
1
A2 A1 e b
A
NOTE: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance 0.1mm unless otherwise specified 3. Coplanarity : 0.1mm 4. Controlling dimension is in millimeter. Converted inch dimensions are not necessarily accurate. 5. Follow JEDEC MO-153 SYMBOL
A A1 A2 b C D E E1 e L y
MIN.
----0.05 0.80 0.19 0.09 9.60 ----4.30 ----0.45 ----0
DIMENSION IN MM NOM.
--------1.00 --------9.70 6.40 4.40 0.65 0.60 ---------
MAX.
1.20 0.15 1.05 0.30 0.20 9.80 ----4.50 ----0.75 0.10 8
MIN.
----0.002 0.031 0.007 0.004 0.378 ----0.169 ----0.018 ----0
DIMENSION IN INCH NOM.
--------0.039 --------0.382 0.252 0.173 0.026 0.024 ---------
MAX.
0.048 0.006 0.041 0.012 0.008 0.386 ----0.177 ----0.030 0.004 8
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties.
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