G220D3X

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 0°C to +70°C PACKAGE TSSOP-28L Note: X Specify the packing type U: Tape & Reel T: Tube Pin Configuration G220 VREF R1+ R1R1R2+ 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 2.2µF 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 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 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 W hen 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 110Ω value. 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 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 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 2.2µF CONTROL LINES (9) TPWR M/S DISCNCT TPWR M/S DISCNCT TERMPWR 2.2µF G220 G220 DIFFSENSE VREF DIFFB 20K 4.7µF 0.1µF DIFFSENS 20K DIFFSENSE DIFFB VREF 0.1µF 4.7µF 2.2µF TPWR M/S DISCNCT DATA LINES (9) TPWR M/S DISCNCT 2.2µF G220 G220 G220 VREF DIFFB DIFFB VREF 4.7µF 2.2µF TPWR M/S DISCNCT DATA LINES (9) 4.7µF TPWR M/S DISCNCT 2.2µF G220 G220 VREF 4.7µF DIFFB DIFFB VREF 4.7µF 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 0°C≤TA≤70°C. 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 µA µA mA mA V V V V mA µA 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=-10ºC T=80ºC 1.375 1.325 Vcm(V) 1.275 1.225 1.175 1.125 -20 0 20 40 60 80 Temperature(ºC) 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=80ºC T=-10ºC 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(ºC) 100 Common Mode Termination Resistance Rcm - Vtpwr @Temperature=24ºC 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(ºC) 100 Differential Mode Termination Resistance Rdm - Vtpwr 110 109 108 107 106 105 104 103 102 101 100 2.5 T=80ºC 110 108 Rdm(Ohm) 106 104 Differential Mode Termination Resistance Rdm - Temperature Vtpwr=2.8V Rdm(Ohm) T=-10ºC Vtpwr=5.8V 102 100 3.5 4.5 Vtpwr 5.5 -20 0 20 40 60 80 Temperature(ºC) 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=24ºC;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(ºC) SE Termination Resistance Rse Vtpwr @Vtpwr=5V;T=24ºC 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=80ºC T=-10ºC 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=24ºC 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(ºC) 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 4.7µF 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. 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 0.1µF 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 2.2µF 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 θ 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 θ MIN. ----0.05 0.80 0.19 0.09 9.60 ----4.30 ----0.45 ----0º 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 8º MIN. ----0.002 0.031 0.007 0.004 0.378 ----0.169 ----0.018 ----0º 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 8º Taping Specification Feed 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