G220 [GMT]
Ultra320 Multi-mode LVD/SE SCSI Terminator; 的Ultra320多模式LVD / SE SCSI终结者
| 型号： | G220 |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | Ultra320 Multi-mode LVD/SE SCSI Terminator |
| 文件： | 总9页 (文件大小：194K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
Ultra320 Multi-mode LVD/SE SCSI Terminator
G220
Features
General Description
ꢀAuto-selectable multi-mode Single-Ended
or LVD Termination
The G220 Multi-mode LVD/SE SCSI terminator pro-
vides a smooth transition into the next generation of
the SCSI Parallel Interface (SPI-4). It automatically
senses the bus, via DIFFSENS, and switches the ter-
mination to either single-ended (SE) or low voltage
differential (LVD) SCSI, dependent on which type of
devices are connected to the bus. If the G220 detects
a HVD SCSI device, it switches to a high impedance
state. For a 16-bit Wide SCSI bus to be operational,
three G220 terminators are needed.
ꢀ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
ꢀ3pF channel capacitance
ꢀ2.9V to 5.5V operation
ꢀThermal protection
ꢀHot-Swap compatible
ꢀ5% tolerance on SE and LVD termination
resistance
The Multi-mode terminator contains all functions re-
quired 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 G220 integrates 18 regulated supplies with nine
precision resistor strings.
ꢀSE/LVD mode indicators
ꢀ28 pin TSSOP package
Applications
ꢀServer and workstation
ꢀHigh-end PC
ꢀIndustrial PC
Ordering Information
ORDER
NUMBER
G220D3X
ꢀDisk Array (RAID)
ꢀSCSI cable
TEMP.
MARKING
PACKAGE
RANGE
G220
0°C to +70°C
TSSOP-28L
Note: X Specify the packing type
U: Tape & Reel T: Tube
Pin Configuration
G220
28
27
26
TPWR
VREF
R1+
R1-
1
2
3
LVD
SE
25 R9-
4
5
6
7
R2+
R2-
NC/ HS GND
R3+
R9+
24
23
22
R8-
R8+
21 R7-
R7+
19 R6-
R3-
R4+
8
9
10
11
12
13
20
R4-
R6+
18
17
R5+
R5-
DIFFB
16 DIFFSENSE
15 M/S
DISCNCT
GND
14
TSSOP-28L
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
1
Global Mixed-mode Technology Inc.
Description
G220
power trace length, thereby resulting in less input ca-
pacitance and reflections which can degrade the bus
signals.
The G220 is used in multi-mode active termination
applications, where single ended (SE) and low voltage
differential (LVD) devices might coexist. The LVD ter-
mination section consists of 18 source/sink amplifiers
(VTOP, VBOT), biasing circuitry and nine precision
resistor strings (RTOP, RMID, RBOT). The SE termi-
nation section consists of a 2.85V source/sink regula-
tor with 9 precision 110ohm resistor. The DIFFSENSE
section consists of a 1.3V, 5mA driver and a sensing
circuit (Figure 1)
The DIFFSENSE pin can drive the SCSI DIFFSENS
line (when M/S is pulled high) to determine the SCSI
bus operating mode. The G220 switches to the termi-
nation 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 105Ω differential and 150Ω common mode
impedance. A fail safe bias of 112mV is maintained
when no drivers are connected to the SCSI bus.
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.
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 regula-
tion. The terminating resistors maintain their 110Ω
value.
The G220 DIFFB pin monitors the DIFFSENS line to
determine the proper operating mode of the device.
HVD Isolation Mode The G220 identifies that there is
an HVD (high voltage differential) device on the SCSI
bus and isolates the termination pins from the bus.
To maintain the specified regulation, a 4.7µF capacitor
is required between the VREF pin and ground of each
G220. A high frequency cap (0.1µF ceramic recom-
mended) can also be placed on the VREF pin in ap-
plications that use fast rise/fall time drivers. A typical
SCSI bus configuration is shown in Figure2.
When DISCNCT is pulled high, the termination pins
are isolated from the SCSI bus, and VREF is
grounded. 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.
An internal pull down resistor assures that the G220
will be terminating the bus if the DISCNCT pin is left
floating.
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 by-
passed locally. A 2.2µF capacitor and a 0.01µF high
frequency capacitor is recommended between TPWR
and ground and placed as close as possible to the
G220. The G220 should be placed as close as possi-
ble to the SCSI connector to minimize signal and
DIFFSENS noise filtering
The G220 incorporates a internal digital filter to re-
move the noise signal on the DIFFSENS control line,
thereby eliminating erroneous switching between
modes. The external filter may be used in addition to
the internal digital filter.
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
2
Global Mixed-mode Technology Inc.
G220
(Figure 1)
Block Diagram
M/S DIFFSENSE
DISCNCT
LVD
SE
THERMAL
SHUTDOWN
CIRCUITRY
DIFFSENSE
CIRCUITRY
CONTROL
DIFFB
LOGIC
VREF
VREF
R1-
110 Ohms
R9-
110Ohms
REFERENCE
GENERATION
VTOP1
+
_
RTOP9
RMID9
X 9
RTOP1
R1-
R1-
R9-
R9-
RMID1
RBOT1
R1+
R1+
R9+
R9+
RBOT9
+
_
VBOT1
X 9
SE
GND
DRIVER
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
3
Global Mixed-mode Technology Inc.
G220
(Figure 2)
SCSI Bus Configuration
CONTROL LINES (9)
TERMPWR
TPWR
TERMPWR
TPWR
M/S
2.2µF
2.2µF
2.2µF
2.2µF
M/S
DISCNCT
DISCNCT
G220
G220
DIFFSENS
DIFFSENSE
DIFFB
DIFFSENSE
DIFFB
VREF
4.7µF
VREF
20K
20K
0.1µF
0.1µF
4.7µF
DATA LINES (9)
TPWR
M/S
TPWR
M/S
DISCNCT
2.2µF
DISCNCT
G220
G220
DIFFB
VREF
VREF
DIFFB
4.7µF
4.7µF
DATA LINES (9)
TPWR
M/S
TPWR
M/S
DISCNCT
2.2µF
DISCNCT
G220
G220
DIFFB
VREF
VREF
DIFFB
4.7µF
4.7µF
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
4
Global Mixed-mode Technology Inc.
G220
Recommended Operating Conditions
PARAMETER
SYMBOL
Vtpwr(SE)
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
Termpower Voltage
V
Vtpwr(LVD)
Logic 0
Logic 1
Vil
Vih
V
V
°C
Operating Temperature
Tamb
Electrical Characteristics
Unless otherwise specified, these specifications apply over the operating ambient temperature range of
0°C≤TA≤70°C.
PARAMETER
LVD Terminator Section
Differential Mode Termination Resistance
Common Mode Termination Resistance
Differential Mode Bias
Common Mode Bias
SYMBOL
CONDITION
MIN TYP MAX UNITS
Rdm
Rcm
Vdm
Vcm
100
110
100
105
150
112
110
190
125
Ohms
Ohms
mV
All lines Open
1.125 1.25
1.375
V
Single Ended Terminator Section
Output Capacitance
SE Termination Resistance
SE Voltage Reference
SE output Current
Cout
Rse
Vref
Iose
Note
Vline = 0-3.0 volts
3
pF
Ohms
Volts
mA
104.5 110
2.79 2.85
115.5
2.93
25.4
Vline = 0.2 volts
Regulator Section
Line Regulation
LIREG
LOREG
ILIM
1.0
1.3
350
2.5
3.5
%
%
mA
Load Regulation
Current Limit
Sink Current
ISINK
200
mA
DC Section
SE mode (No Load)
LVD mode (No Load)
4
20
Termpower Current
Itpmr
mA
Input Leakage High
Input Leakage Low
Iih
Iil
-1.0
µA
µA
1.0
Output Current High
Output Current Low
Ioh
Iol
Vout = 2.4 volts; SE/LVD Pins only
Vout=0.4 volts; SE/LVD Pins only
-1.0
4.0
mA
mA
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
Note: Guaranteed by Design.
Vseor
Vlvdor
Vhvdor
Vdso
Idsh
-0.3
0.7
2.4
1.2
5
0.5
1.9
Vtpwr+0.3
1.4
15
V
V
V
V
mA
µA
M/S=1; Ids = 0-5mA
M/S = 1; Vdso=0V
M/S=1; Vdso=2.75V
Idsl
20
200
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
5
Global Mixed-mode Technology Inc.
G220
Typical Operating Characteristics
Common Mode Bias Vcm -
Temperature
Common Mode Bias Vcm - Vtpwr
1.375
1.325
1.275
1.225
1.175
1.125
1.375
1.325
1.275
1.225
1.175
1.125
T=80ºC
V
tpwr=5.8V
Vtpwr=2.8V
T=-10ºC
2.5
3.5
4.5
Vtpwr
5.5
-20
0
20
40
60
80 100
Temperature(ºC)
Differential Mode Bias Vdm -
Temperature@Vtpwr=5V
Differential Mode Bias Vdm - Vtpwr
0.125
0.12
0.115
0.11
0.105
0.1
0.125
0.12
0.115
0.11
0.105
0.1
T=-10ºC
T=80ºC
-20
0
20
40
60
80 100
2.5
3.5
4.5
Vtpwr
5.5
Temperature(ºC)
Common Mode Termination Resistance
Rcm - Vtpwr @Temperature=24ºC
190
Common Mode Termination Resistance
Rcm - Temperature@Vtpwr=5V
190
180
170
160
150
140
130
120
110
180
170
160
150
140
130
120
110
2.5
3.5
4.5
Vtpwr
5.5
-20
0
20
40
60
80 100
Temperature(ºC)
Differential Mode Termination
Resistance Rdm - Vtpwr
Differential Mode Termination
Resistance Rdm - Temperature
110
109
108
107
106
105
104
103
102
101
100
110
108
106
104
102
100
T=80ºC
Vtpwr=2.8V
T=-10ºC
V
tpwr=5.8V
2.5
3.5
4.5
Vtpwr
5.5
-20
0
20
40
60
80 100
Temperature(ºC)
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
6
Global Mixed-mode Technology Inc.
G220
SE Termination Resistance Rse -
Vtpwr @Vline=0V
SE Termination Resistance Rse -
Vtpwr @T=24ºC;Vline=0V
115
113
111
109
107
105
115
114
113
112
111
110
109
108
107
106
105
Vtpwr=3.8V
Vtpwr=5.8V
20 40
Temperature(ºC)
3.5
4.5
Vtpwr
5.5
-20
0
60
80 100
SE Termination Resistance Rse -
Vtpwr @Vtpwr=5V;T=24ºC
Vref - Ivref@Vtpwr=5V
2.93
2.91
2.89
2.87
2.85
2.83
2.81
2.79
115
113
111
109
107
105
T=80ºC
T=-10ºC
0
1
2
3
-250 -150 -50 50 150 250 350
Ivref(mA)
Vline
Vref - Vtpwr@T=24ºC
Vref - Temperature@Ivref=0mA
2.93
2.91
2.89
2.87
2.85
2.83
2.81
2.79
2.93
2.91
2.89
2.87
2.85
2.83
2.81
2.79
I
vref=-200mA
vref=0mA
Vtpwr=5.8V
I
Vtpwr=3.8V
Ivref=360mA
4.5
3.5
5.5
-20
0
20
40
60
80 100
Temperature(ºC)
Vtpwr
Ver: 0.1 Preliminary
TEL: 886-3-5788833
Apr 03, 2003
http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
G220
Pin Description
PIN
SYMBOL
DESCRIPTION
2.85-volt reference in SE mode and 1.25V in LVD mode; must be connected to a
Reference Voltage.
4.7µF capacitor.
1
VREF
(X=1,2,3,…..9)
Signal Termination.
2-5,7-12,
18-25
Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus.
Rx+, Rx-
Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI
bus.
6
13
14
NC/ HS GND
DISCNCT
GND
Should be grounded for heat sinking purpose
t. When pulled high, the G220 isolates its bus pins (Rx+, Rx-) from the SCSI bus.
Terminator ground pin. Connected to ground.
No Connect/Heat Sink Ground.
Disconnec
Ground.
Master/slave.
DIFFSENSE driver.
Used to select which terminator is the controlling device. M/S pin high enables the
15
16
M/S
DIFFSENSE Output to drive the SCSI bus DIFFSENS line.
DIFFB pin should be connected to a 0.1µF capacitor to GND and 20k resistor to SCSI/Bus
DIFFSENS line. An input pin to detect the type of device (differential or single-ended) on the SCSI
bus.
17
DIFFB
26
27
28
SE
LVD
TPWR
It is HIGH when terminator is operating in SE mode.
Single ended mode indicator.
It is HIGH when terminator is operating in LVD mode.
Low Voltage Differential mode indicator.
Connect to the SCSI TERMPWR line and de-couple with a 2.2µF capacitor.
Terminator Power.
*The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed.
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
8
Global Mixed-mode Technology Inc.
G220
Package Information
D
28
L
E
E1
1
A2
A1
e
b
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
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN.
-----
0.05
0.80
0.19
0.09
9.60
-----
4.30
-----
0.45
-----
0º
NOM.
-----
MAX.
1.20
0.15
1.05
0.30
0.20
9.80
-----
4.50
-----
0.75
0.10
8º
MIN.
-----
NOM.
-----
MAX.
0.048
0.006
0.041
0.012
0.008
0.386
-----
0.177
-----
0.030
0.004
8º
A
A1
A2
b
-----
0.002
0.031
0.007
0.004
0.378
-----
0.169
-----
0.018
-----
0º
-----
1.00
-----
0.039
-----
C
-----
-----
D
9.70
6.40
4.40
0.65
0.60
-----
0.382
0.252
0.173
0.026
0.024
-----
E
E1
e
L
y
θ
-----
-----
Taping Specification
Feed Direction
Typical TSSOP Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 0.1 Preliminary
TEL: 886-3-5788833
http://www.gmt.com.tw
Apr 03, 2003
9
相关型号：
G22041431100K2C000
RESISTOR, WIRE WOUND, 4 W, 10 %, 180 ppm, 110 ohm, THROUGH HOLE MOUNT, AXIAL LEADED, ROHS COMPLIANT
VISHAY
G22041431100K4C000
RESISTOR, WIRE WOUND, 4 W, 10 %, 180 ppm, 110 ohm, THROUGH HOLE MOUNT, AXIAL LEADED, ROHS COMPLIANT
VISHAY
G22041431101K2C000
RESISTOR, WIRE WOUND, 4 W, 10 %, 180 ppm, 1100 ohm, THROUGH HOLE MOUNT, AXIAL LEADED, ROHS COMPLIANT
VISHAY
G22041431101KF1000
RESISTOR, WIRE WOUND, 4 W, 10 %, 180 ppm, 1100 ohm, THROUGH HOLE MOUNT, AXIAL LEADED, ROHS COMPLIANT
VISHAY
G22041431107JF1000
RESISTOR, WIRE WOUND, 4 W, 5 %, 180 ppm, 0.11 ohm, THROUGH HOLE MOUNT, AXIAL LEADED, GREEN
VISHAY
©2020 ICPDF网 联系我们和版权申明