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Global Mixed-mode Technology Inc.
G219
Ultra320 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), 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 28 pin TSSOP package 28 Pin TSSOP: Pin Compatible with DS2119
General Description
The G219 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 G219 detects a HVD SCSI device, it switches to a high impedance state. For a 16-bit Wide SCSI bus to be operational, three G219 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 G219 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
G219
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 R9R9+ R8R8+ NC/ HS GND R7R7+ R6R6+ DIFFB DIFFSENSE M/S
28Pin TSSOP
Ver 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Ordering Information
PART NUMBER
G219T-D3 G219R-D3
G219
PIN-PACKAGE
TSSOP-28 pin / Tube TSSOP-28 pin / Tape & Reel
TEMP. RANGE
0C-70C 0C-70C
Note: DIFFSENSRefers to the SCSI bus signal. DIFFSENSERefers to the G219 pin name and internal circuitry relating to differential sensing. DIFFBRefers to the G219 pin name and internal circuitry relating to monitoring the DIFFSENS line.
Functional Description
The G219 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 G219 DIFFB pin monitors the DIFFSENS line to determine the proper operating mode of the device. HVD Isolation Mode The G219 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 G219. The G219 should be placed as close as possible to the SCSI connector to minimize signal and power trace length, thereby resulting in less input ca-
pacitance 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 G219 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 G219. 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 G219 will be terminating the bus if the DISCNCT pin is left floating. DIFFSENS noise filtering The G219 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 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Block Diagram
(Figure 1)
G219
DISCNCT
M/S DIFFSENSE
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 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
SCSI Bus Configuration (Figure 2)
G219
TERMPWR 2.2F TPWR M/S DISCNCT
CONTROL LINES (9) TPWR M/S DISCNCT
TERMPWR 2.2F
G219
G219
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
G219
G219
VREF
DIFFB
DIFFB
VREF
4.7F 2.2F TPWR M/S DISCNCT DATA LINES (9)
4.7F TPWR M/S DISCNCT 2.2F
G219
G219
VREF
DIFFB
DIFFB
VREF
4.7F
4.7F
Ver 1.2 Feb 08, 2002
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
G219
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 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 Vseor Vlvdor Vhvdor Vdso Idsh Idsl SE mode (No Load) LVD mode (No Load) -1.0 1.0 -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 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
M/S=1; Ids = 0-5mA M/S = 1; Vdso=0V M/S=1; Vdso=2.75V
Note: Guaranteed by Design.
Ver 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Operating Characteristics
Common Mode Bias Vcm - Vtpwr 1.375 1.325 Vcm(V) 1.275 1.225 T=-10C 1.175 1.125 2.5 3.5 4.5 Vtpwr 5.5 1.175 1.125 -20 0 20 40 60 80 Temperature(C) T=80C 1.375 1.325 Vcm(V) 1.275 1.225 Vtpwr=2.8V Vtpwr=5.8V Common Mode Bias Vcm Temperature
G219
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 2.5 110 T=80C 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 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
G219
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 2.89 Rse(Ohm) Vref 111 109 107 105 0 1 Vline 2 3 2.87 2.85 2.83 2.81 2.93 2.91
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 3.5
Ivref=360mA Ivref=0mA 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
4.5 Vtpwr
5.5
Ver 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Pin Description
PIN
1
G219
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.
2-5,7-12, 18-21, 23-26 6,22 13 14 15 16 17 27,28
Rx+, Rx-
NC/ HS GND No Connect/Heat Sink Ground. Should be grounded for heat sinking purpose DISCNCT Disconnect. When pulled high, the G219 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.
Ver 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
8
Global Mixed-mode Technology Inc.
Package Information
D 28
C
G219
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
Ver 1.2 Feb 08, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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