SSC SS8219G

SS8219G
Ultra320 Multi-mode LVD/SE SCSI Terminator
PRODUCT SUMMARY
DESCRIPTION
SPI mode auto-detection/switching.
Pin/pin compatible with popular industry
standard parts DS2118/9 and UCC5672
FEATURES
Auto-selectable 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)
and Ultra320 (SPI-4 LVD) standards
Supports active negation
Channel capacitance of 3pF
Operation from 2.9V to 5.5V
Thermal protection
Hot-swap compatible
Tolerance of 5% on termination resistance
Available in 28 pin TSSOP or 36 pin SSOP
The SS8219G multi-mode LVD/SE SCSI terminator
provides a smooth transition between modes of the
SCSI Parallel Interface. It automatically senses the bus
via DIFFSENS and switches the termination to either
single-ended (SE) or low voltage differential (LVD) SCSI,
based on which type of devices are connected to the bus.
If the SS8219G detects an HVD SCSI device, it switches
to a high impedance state.
A 16-bit wide SCSI bus requires three SS8219G for
termination.
This multi-mode terminator contains all the functions
to terminate, auto detect and switch modes for SCSI
Parallel Interface (SPI) bus architectures.
For SE termination, one regulator and nine precision 110Ω
resistors are used.
For LVD termination, the SS8219G integrates 18 regulated
supplies with nine precision resistor strings.
Pb-free, RoHS compliant.
APPLICATIONS
High performance data storage systems in servers,
workstations, high-end and industrial PCs, and RAID
disk arrays.
PIN CONFIGURATION
VREF
1
36
NC
2
35
HVD
NC
3
34
LVD
TPWR
R1+
4
33
SE
VREF
1
28
TPWR
R1-
5
32
R9-
R1+
2
27
R2+
6
31
R9+
R1-
3
26
TPWR
R9-
R2-
7
30
R8-
R2+
R2-
4
25
R9+
HS/GND
8
29
5
24
R8-
HS/GND
9
28
R8+
HS/GND
NC/ HS GND
R3+
6
23
R8+
10
27
HS/GND
7
22
NC/ HS GND
HS/GND
R3+
11
26
HS/GND
R3-
8
21
R7-
R3-
12
25
R7R7+
R4+
9
20
R7+
R4+
13
24
R4-
10
19
R6-
R4-
14
23
R6-
R5+
11
18
R6+
R5+
15
22
R6+
R5-
12
17
DIFFB
DISCNCT
13
16
DIFFSENSE
GND
14
15
M/S
R5-
16
21
DIFFB
DISCNCT
17
20
DIFFSENSE
GND
18
19
M/S
28 pin TSSOP
12/06/2005 Rev.3.01
36 pin SSOP
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SS8219G
ORDERING INFORMATION
SS8219GX XX
TR = tape and reel; TB = tubes
For example: SS8219GD TR
GD = RoHS-compliant TSSOP-28
GS = RoHS-compliant SSOP-36
=> SS8219 in RoHS-compliant TSSOP-28
supplied on tape and reel
APPLICATION INFORMATION
Please note for the following sections :
DIFFSENS - refers to the SCSI bus signal.
DIFFSENSE - refers to the SS8219G pin name and internal circuitry related to differential sensing.
DIFFB - refers to the SS8219G pin name and internal circuitry related to monitoring the DIFFSENS line.
The SS8219G 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
nine precision 110Ω resistors. The DIFFSENSE section
consists of a 1.3V, 5mA driver and a sensing circuit (Fig.1).
DIFFSENS is used to identify which types of SCSI
devices are present on the bus. If the voltage on
DIFFSENS is between 0V and 0.5V the bus is singleended; if it is between 0.7V and 1.9V, the bus is LVD;
and if it is greater than 2.4V, the bus is HVD.
The SS8219G DIFFB pin monitors the DIFFSENS line
to determine the proper operating mode of the device.
HVD Isolation Mode: The SS8219G 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, or during thermal
shutdown, the termination pins are isolated from the
SCSI bus and VREF is grounded. 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 2.2µF capacitor and a 0.01µF high
frequency capacitor are recommended between TPWR
and ground and placed as close as possible to the
SS8219G. The IC should be placed as close as possible
to the SCSI connector to minimize both signal and power
trace length, thereby reducing the input capacitance
12/06/2005 Rev.3.01
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 SS8219G switches to the
appropriate termination mode 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
105Ω differential and 150Ω 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 Ω value.
To maintain the specified regulation, a 4.7µF capacitor
is required between the VREF pin and ground of each
SS8219G. A high frequency capacitor (0.1µF 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 Figure 2.
An internal pull-down resistor assures that the SS8219G
will still terminate the bus if the DISCNCT pin is left floating.
DIFFSENS noise filtering
The SS8219G incorporates an internal digital filter to
remove the noise signal on the DIFFSENS control line,
thereby eliminating erroneous switching between
modes. An external filter may also be used in addition to
this internal digital filter.
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SS8219G
BLOCK DIAGRAM (Figure 1)
( 36pin SSO P only )
M/S
DIFFS ENS E
SE LV D HV D
DISC NCT
THER MA L
SHU TDOW N
CIRC UITRY
DIFFS ENS E
CIRC UITRY
CO NTROL
LOG IC
DIFFB
V REF
V REF
R1-
110 Ω
R9110 Ω
REFER ENC E
GENERA TIO N
V TOP1
+
_
RTO P9
X9
RTO P1
R1-
R1-
R9R9RMID1
RMID9
R1+
R1+
R9+
R9+
RBO T1
RBO T9
+
_
V BOT1
X9
SE
GN D
DR IV ER
12/06/2005 Rev.3.01
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SS8219G
SCSI BUS CONFIGURATION (Figure 2)
CONTROL LINES (9)
TERMPWR
2.2µF
TERMPWR
TPWR
M/S
DISCNCT
TPWR
M/S
DISCNCT
SS8219G
SS8219G
DIFFSENS
DIFFSENSE
VREF
20K
20K
2.2µF
DIFFSENSE
DIFFB
VREF
DIFFB
4.7µF
0.1µF
0.1µF
4.7µF
DATA LINES (9)
TPWR
TPWR
M/S
M/S
DISCNCT
SS8219G
DIFFB
DIFFB
VREF
4.7µF
4.7µF
2.2µF
DATA LINES (9)
TPWR
TPWR
M/S
M/S
DISCNCT
VREF
2.2µF
DISCNCT
SS8219G
SS8219G
DIFFB
DIFFB
VREF
4.7µF
4.7µF
12/06/2005 Rev.3.01
2.2µF
DISCNCT
SS8219G
VREF
2.2µF
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SS8219G
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Termpower Voltage
SYMBOL
MIN
TYP
MAX
UNITS
Vtpwr(SE)
Vtpwr(LVD)
4.0
2.9
5
5
5.5
5.5
V
Vil
Vih
Tamb
-0.3
2.0
0
+0.8
Vtpwr+0.3
70
V
V
°C
Logic 0
Logic 1
Operating Temperature
ELECTRICAL CHARACTERISTICS (from TA = 0°C to 70°C, unless otherwise spedified)
PARAMETER
SYMBOL
CONDITION
MIN
All lines Open
TYP
MAX
UNITS
LVD Terminator Section
Differential Mode Termination Resistance
Rdm
100
105
110
Ω
Common Mode Termination Resistance
Differential Mode Bias
Common Mode Bias
Rcm
Vdm
Vcm
110
100
1.125
150
112
1.25
190
125
1.375
Ω
mV
V
Single Ended Terminator Section
Output Capacitance
SE Termination Resistance
SE Voltage Reference
SE output Current
Cout
Rse
Vref
Iose
104.5
2.79
110
2.85
3
115.5
2.93
25.4
pF
Ω
Volts
mA
2.5
3.5
%
%
mA
Regulator Section
Line Regulation
Load Regulation
Current Limit
Sink Current
Note
Vline = 0-3.0 volts
Vline = 0.2 volts
LIREG
LOREG
ILIM
1.0
1.3
350
ISINK
200
mA
DC Section
Termpower Current
Itpmr
Input Leakage High
Input Leakage Low
Output Current High
Output Current Low
Iih
Iil
Ioh
Iol
DIFFSENS Section
DIFFSENS SE Operating Range
DIFFSENS LVD Operating Range
DIFFSENS HVD Operating Range
Vseor
Vlvdor
Vhvdor
DIFFSENSE Driver Output Voltage
DIFFSENSE Driver Source Current
DIFFSENSE Driver Sink Current
Vdso
Idsh
Idsl
SE mode (No Load)
LVD mode (No Load)
4
20
mA
-1.0
1.0
Vout = 2.4 volts; SE/LVD/HVD Pins only
Vout=0.4 volts; SE/LVD/HVD Pins only
M/S=1; Ids = 0-5mA
M/S = 1; Vdso=0V
M/S=1; Vdso=2.75V
-1.0
4.0
µA
µA
mA
mA
-0.3
0.7
2.4
0.5
1.9
Vtpwr+0.3
V
V
V
1.2
1.4
15
200
V
mA
µA
5
20
Note: guaranteed by Design.
12/10/2005 Rev.3.01
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SS8219G
Common Mode Bias Vcm vs.
Temperature
Common Mode Bias Vcm vs. Vtpwr
1.375
1.375
T=80ºC
Vtpwr=5.8V
1.325
1.275
Vcm(V)
Vcm(V)
1.325
1.225
1.275
1.225
Vtpwr=2.8V
T=-10ºC
1.175
1.175
1.125
1.125
2.5
3.5
4.5
Vtpwr
-20
5.5
0.125
0.115
0.11
Vdm(V)
Vdm(V)
0.12
T=-10ºC
T=80ºC
0.115
0.11
0.105
0.105
0.1
0.1
2.5
3.5
4.5
Vtpwr
-20
5.5
Common Mode Termination Resistance
Rcm vs. Vtpwr at Temperature=24ºC
190
190
180
180
170
170
160
150
140
0
20
40
60
80
Temperature(ºC)
100
Common Mode Termination Resistance
Rcm vs. Temperature at Vtpwr=5V
Rcm(Ohm)
Rcm(Ohm)
100
0.125
0.12
160
150
140
130
130
120
120
110
110
2.5
3.5
4.5
Vtpwr
5.5
-20
Differential Mode Termination
Resistance Rdm vs. Vtpwr
110
109
108
107
106
105
104
103
102
101
100
0
20
40
60
80
Temperature(ºC)
100
Differential Mode Termination
Resistance Rdm vs. Temperature
110
T=80ºC
Vtpwr=2.8V
108
Rdm(Ohm)
Rdm(Ohm)
20
40
60
80
Temperature(ºC)
Differential Mode Bias Vdm vs.
[email protected]=5V
Differential Mode Bias Vdm vs. Vtpwr
T=-10ºC
106
104
Vtpwr=5.8V
102
100
2.5
12/10/2005 Rev.3.01
0
3.5
4.5
Vtpwr
5.5
-20
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0
20
40
60
80
Temperature(ºC)
100
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SS8219G
SE Termination Resistance Rse
vs. Vtpwr at Vline=0V
SE Termination Resistance Rse
vs. Vtpwr at T=24ºC; Vline=0V
115
Rse(Ohm)
Rse(Ohm)
113
111
109
107
105
3.5
4.5
115
114
113
112
111
110
109
108
107
106
105
Vtpwr=3.8V
Vtpwr=5.8V
-20
5.5
0
20
40
60
80
100
Temperature(ºC)
Vtpwr
SE Termination Resistance Rse
vs. Vtpwr at Vtpwr=5V; T=24ºC
Vref vs. Ivref at Vtpwr=5V
2.93
115
2.91
113
111
Vref
Rse(Ohm)
2.89
109
T=80ºC
2.87
2.85
2.83
107
T=-10ºC
2.81
105
0
1
2
2.79
-250 -150 -50
3
2.93
2.93
2.89
2.89
2.87
2.87
2.85
2.83
2.83
Vtpwr=3.8V
2.81
2.79
2.79
0
20
40
Ivref=0mA
2.85
2.81
-20
Ivref=-200mA
2.91
Vtpwr=5.8V
Vref
Vref
2.91
150 250 350
Vref vs. Vtpwr at T=24ºC
Vref vs. Temperature at Ivref=0mA
60
80
100
Ivref=360mA
3.5
Temperature(ºC)
12/10/2005 Rev.3.01
50
Ivref(mA)
Vline
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4.5
5.5
Vtpwr
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SS8219G
PIN DESCRIPTION (for 28pin TSSOP)
PIN
SYMBOL
1
VREF
2-5,7-12,
18-21, 23-26
Rx+, Rx-
6,22
13
14
15
DESCRIPTION
Reference Voltage. 2.85-volt reference in SE mode and 1.25V in LVD mode; must be connected to
a 4.7µF 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.
NC/ HS GND No Connect/Heat Sink Ground. Should be grounded for heat sinking purpose
DISCNCT Disconnect. When pulled high, the SS8219G 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
M/S
the DIFFSENSE driver.
16
17
27,28
DIFFSENSE Output to drive the SCSI bus DIFFSENS line.
An input pin to detect the type of device (differential or single-ended) on the SCSI bus. The
DIFFB
DIFFB pin should be connected by a 0.1µF capacitor to GND and by a 20kΩ resistor to the SCSI
bus DIFFSENS line.
TPWR
Terminator Power. Connect to the SCSI TERMPWR line and de-couple with a 2.2µF capacitor.
*The VREF keeps the level at 2.85 volts, whether the DISCNCT pin is asserted or not; even if the termination mode is changed.
PIN DESCRIPTION (for 36pin SSOP)
PIN
SYMBOL
1
VREF*
2,3
4-7,11-16,
22-25,
29-32
8, 9,10,26,
27,28
17
NC
DISCNCT
18
GND
19
20
21
33
34
35
36
Rx+
RxHS/GND
DESCRIPTION
Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF 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 SS8219G 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
M/S
the DIFFSENSE driver.
DIFFSENSE Output to drive the SCSI bus DIFFSENS line.
An input pin to detect the type of device (differential or single-ended) on the SCSI bus. The
DIFFB
DIFFB pin should be connected by a 0.1µF capacitor to GND and 20kΩ resistor to the SCSI bus
DIFFSENS line.
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 2.2µF capacitor.
*The VREF keeps the level at 2.85 volts, whether the DISCNCT pin is asserted or not; even if the termination mode is changed.
12/10/2005 Rev.3.01
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8 of 10
SS8219G
PHYSICAL DIMENSIONS (36pin SSOP - order package option S)
C
L
E1 E
h x 45°
Θ
D
A
A1
0.004 C
SEATING PLANE
b
e
SYMBOL
MIN.
A
A1
b
2.413
0.203
0.300
c
D
e
E
0.127
15.748
E1
h
L
Θ
7.391
0.381
0.508
0º
DIMENSION IN MM
TYP.
2.591
0.305
15.875
0.800 BASIC
10.033
7.493
MAX.
MIN.
2.794
0.406
0.450
0.095
0.008
0.012
0.254
16.002
0.005
0.620
10.668
0.395
7.595
0.635
1.016
8º
0.291
0.015
0.020
0º
DIMENSION IN INCH
TYP.
0.102
0.012
0.625
0.032 BASIC
MAX.
0.110
0.016
0.018
0.010
0.630
0.420
0.295
0.289
0.025
0.040
8º
Taping Specification
Feed Direction
Typical SSOP, TSSOP Package Orientation
Rev.2.02 12/06/2003
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SS8219G
PHYSICAL DIMENSIONS (28pin TSSOP - order package option D)
C
D
28
L
E1
E
1
Θ
A
A2
A1
e
b
Note:
1. Package body dimensions exclude mold flash protrusions or gate burrs
2. Tolerance ±0.1mm unless otherwise specified
3. Coplanarity : 0.1mm
4. Controlling dimensions are in millimeters. Converted inch dimensions are not necessarily accurate.
5. Follows JEDEC MO-153
MIN.
DIMENSION IN MM
NOM.
MAX.
MIN.
DIMENSION IN INCH
NOM.
MAX.
A
A1
A2
----0.05
0.80
--------1.00
1.20
0.15
1.05
----0.002
0.031
--------0.039
0.048
0.006
0.041
b
C
D
E
0.19
0.09
9.60
-----
--------9.70
6.40
0.30
0.20
9.80
-----
0.007
0.004
0.378
-----
--------0.382
0.252
0.012
0.008
0.386
-----
E1
e
L
y
Θ
4.30
----0.45
-----
4.40
0.65
0.60
-----
4.50
----0.75
0.10
0.169
----0.018
-----
0.173
0.026
0.024
-----
0.177
----0.030
0.004
8º
0º
-----
8º
SYMBOL
0º
-----
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.
12/10/2005 Rev.3.01
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