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Global Mixed-mode Technology Inc.
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), 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 SE/LVD mode indicators 28 pin TSSOP package
Ultra320 Multi-mode LVD/SE SCSI Terminator
General Description
G220
The G220 Multi-mode LVD/SE SCSI terminator provides a smooth transition into the next generation of the SCSI Parallel Interface (SPI-4). 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 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. 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 G220 integrates 18 regulated supplies with nine precision resistor strings.
Applications
Server and workstation High-end PC Industrial PC Disk Array (RAID) SCSI cable
Ordering Information
ORDER NUMBER
G220D3X
MARKING
G220
TEMP. RANGE
0C to +70C
PACKAGE
TSSOP-28L
Note: X Specify the packing type U: Tape & Reel T: Tube
Pin Configuration
G220
VREF R1+ R1R2+ R2NC/ HS GND R3+ R3R4+ R4R5+ R5DISCNCT 1 2 3 4 5 6 7 8 9 10 11 12 13 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TPWR LVD SE R9R9+ R8R8+ R7R7+ R6R6+ DIFFB DIFFSENSE M/S
GND 14
TSSOP-28L
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Description
The G220 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 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. 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. 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 G220. The G220 should be placed as close as possible to the SCSI connector to minimize signal and
G220
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 G220 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 G220. 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 G220 will be terminating the bus if the DISCNCT pin is left floating. DIFFSENS noise filtering The G220 incorporates a internal digital filter to remove 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 Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Block Diagram
(Figure 1)
G220
DISCNCT
M/S DIFFSENSE
SE LVD
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 DRIVER
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
SCSI Bus Configuration (Figure 2)
G220
TERMPWR 2.2F
CONTROL LINES (9) TPWR M/S DISCNCT TPWR M/S DISCNCT
TERMPWR 2.2F
G220
G220
DIFFSENSE VREF DIFFB 20K 4.7F 0.1F
DIFFSENS 20K
DIFFSENSE DIFFB VREF 0.1F 4.7F
2.2F
TPWR M/S DISCNCT
DATA LINES (9)
TPWR M/S DISCNCT
2.2F
G220
G220
VREF
DIFFB
DIFFB
VREF
4.7F 2.2F TPWR M/S DISCNCT DATA LINES (9)
4.7F TPWR M/S DISCNCT 2.2F
G220
G220
VREF 4.7F
DIFFB
DIFFB
VREF 4.7F
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Recommended Operating Conditions
PARAMETER
Termpower Voltage Logic 0 Logic 1 Operating Temperature
G220
MAX
5.5 5.5 +0.8 Vtpwr+0.3 70
SYMBOL
Vtpwr(SE) Vtpwr(LVD) Vil Vih Tamb
MIN
4.0 2.9 -0.3 2.0 0
TYP
5 5
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 Pins only Vout=0.4 volts; SE/LVD 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.
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Typical Operating Characteristics
Common Mode Bias Vcm - Vtpwr 1.375 1.325 Vcm(V) 1.275 1.225 1.175 1.125 2.5 3.5 4.5 Vtpwr 5.5 T=-10C T=80C 1.375 1.325 Vcm(V) 1.275 1.225 1.175 1.125 -20 0 20 40 60 80 Temperature(C) Vtpwr=2.8V Vtpwr=5.8V Common Mode Bias Vcm Temperature
G220
100
Differential Mode Bias Vdm - Vtpwr
0.125 0.12 Vdm(V) 0.115 0.11 0.105 0.1 2.5 3.5 4.5 Vtpwr 5.5 T=80C T=-10C Vdm(V) 0.125 0.12 0.115 0.11 0.105 0.1 -20
Differential Mode Bias Vdm Temperature@Vtpwr=5V
0
20 40 60 80 Temperature(C)
100
Common Mode Termination Resistance Rcm - Vtpwr @Temperature=24C 190 180 170 Rcm(Ohm) Rcm(Ohm) 160 150 140 130 120 110 2.5 3.5 4.5 Vtpwr 5.5
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
110 109 108 107 106 105 104 103 102 101 100 2.5 T=80C 110 108 Rdm(Ohm) 106 104
Differential Mode Termination Resistance Rdm - Temperature
Vtpwr=2.8V
Rdm(Ohm)
T=-10C
Vtpwr=5.8V 102 100
3.5
4.5 Vtpwr
5.5
-20
0
20 40 60 80 Temperature(C)
100
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
G220
SE Termination Resistance Rse Vtpwr @T=24C;Vline=0V
115 113 Rse(Ohm) 111 109 107 105 3.5 4.5 Vtpwr 5.5 Rse(Ohm)
SE Termination Resistance Rse Vtpwr @Vline=0V
115 114 113 112 111 110 109 108 107 106 105 -20 0
Vtpwr=3.8V
Vtpwr=5.8V 20 40 60 80 100
Temperature(C)
SE Termination Resistance Rse Vtpwr @Vtpwr=5V;T=24C
115 113 Rse(Ohm) 111 109 107 105 0 1 Vline 2 3 2.93 2.91 2.89 Vref 2.87 2.85 2.83 2.81
Vref - Ivref@Vtpwr=5V
T=80C
T=-10C
2.79 -250 -150 -50
50
150 250 350
Ivref(mA)
Vref - Temperature@Ivref=0mA
2.93 2.91 2.89 Vtpwr=5.8V
Vref - Vtpwr@T=24C
2.93 2.91 2.89 Vref 2.87 2.85 2.83 2.81 2.79
Ivref=360mA Ivref=-200mA
Vref
2.87 2.85 2.83 2.81 2.79 -20 0 20 40 60 80 100 Temperature(C) Vtpwr=3.8V
Ivref=0mA
3.5
4.5 Vtpwr
5.5
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
7
Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2-5,7-12, 18-25 6 13 14 15 16 17 26 27 28
G220
SYMBOL
VREF
DESCRIPTION
Reference Voltage. 2.85-volt reference in SE mode and 1.25V in LVD mode; 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.
Rx+, Rx-
NC/ HS GND No Connect/Heat Sink Ground. Should be grounded for heat sinking purpose DISCNCT Disconnect. When pulled high, the G220 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. SE Single ended mode indicator. It is HIGH when terminator is operating in SE mode. LVD Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode. 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.
Ver: 0.1 Preliminary Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
8
Global Mixed-mode Technology Inc.
Package Information
D 28
G220
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
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 Apr 03, 2003
TEL: 886-3-5788833 http://www.gmt.com.tw
9

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