G220 Global Mixed-mode Technology Inc. Ultra320 Multi-mode LVD/SE SCSI Terminator Features General Description Auto-selectable multi-mode Single-Ended 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. 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 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 MARKING TEMP. RANGE PACKAGE G220D3X G220 0°C to +70°C TSSOP-28L Note: X Specify the packing type U: Tape & Reel T: Tube Pin Configuration G220 VREF 1 28 TPWR R1+ 2 27 R1- 3 26 LVD SE R2+ 4 25 R9- R2- 5 24 R9+ NC/ HS GND 6 23 R8- R3+ 7 22 R8+ R3- 8 21 R7- R4+ 9 20 R7+ R4- 10 19 R6- R5+ 11 18 R6+ R5- 12 17 DIFFB DISCNCT 13 16 DIFFSENSE GND 14 15 M/S TSSOP-28L Ver: 0.1 Preliminary Apr 03, 2003 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. G220 power trace length, thereby resulting in less input capacitance and reflections which can degrade the bus signals. 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) 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. 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 regulation. 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 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. 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 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 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 G220 Global Mixed-mode Technology Inc. Block Diagram (Figure 1) M/S DIFFSENSE DISCNCT SE LVD THERMAL SHUTDOWN CIRCUITRY DIFFSENSE CIRCUITRY CONTROL LOGIC DIFFB VREF VREF R1- 110 Ohms R9110 Ohms REFERENCE GENERATION + _ VTOP1 RTOP9 X9 RTOP1 R1- R1R9R9- RMID1 RMID9 R1+ R1+ R9+ RBOT1 + _ R9+ RBOT9 VBOT1 X9 SE GND DRIVER Ver: 0.1 Preliminary Apr 03, 2003 TEL: 886-3-5788833 http://www.gmt.com.tw 3 G220 Global Mixed-mode Technology Inc. SCSI Bus Configuration (Figure 2) TERMPWR 2.2µF CONTROL LINES (9) TERMPWR TPWR M/S DISCNCT TPWR M/S DISCNCT G220 G220 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 G220 DIFFB DIFFB VREF 4.7µF 4.7µF DATA LINES (9) TPWR 2.2µF 2.2µF DISCNCT G220 VREF 2.2µF TPWR M/S M/S DISCNCT G220 VREF 2.2µF DISCNCT G220 DIFFB DIFFB VREF 4.7µF 4.7µF Ver: 0.1 Preliminary Apr 03, 2003 TEL: 886-3-5788833 http://www.gmt.com.tw 4 G220 Global Mixed-mode Technology Inc. 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 Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C≤ ≤TA≤70°C. PARAMETER SYMBOL CONDITION MIN Rdm 100 105 110 Ohms Rcm Vdm Vcm All lines Open 110 100 1.125 150 112 1.25 190 125 1.375 Ohms mV V 104.5 2.79 110 2.85 3 115.5 2.93 25.4 pF Ohms Volts mA 2.5 3.5 % % mA 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 Cout Rse Vref Iose Regulator Section Line Regulation Load Regulation Current Limit Sink Current Note Vline = 0-3.0 volts TYP Vline = 0.2 volts LIREG LOREG ILIM 1.0 1.3 350 ISINK MAX 200 UNITS 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 Pins only Vout=0.4 volts; SE/LVD Pins only -1.0 4.0 -0.3 0.7 2.4 M/S=1; Ids = 0-5mA M/S = 1; Vdso=0V M/S=1; Vdso=2.75V 1.2 5 20 µA µA mA mA 0.5 1.9 Vtpwr+0.3 V V V 1.4 15 200 V mA µA Note: Guaranteed by Design. Ver: 0.1 Preliminary Apr 03, 2003 TEL: 886-3-5788833 http://www.gmt.com.tw 5 G220 Global Mixed-mode Technology Inc. Typical Operating Characteristics Common Mode Bias Vcm Temperature Common Mode Bias Vcm - Vtpwr 1.375 1.375 T=80ºC 1.275 1.225 T=-10ºC 1.175 Vtpwr=5.8V 1.325 Vcm(V) Vcm(V) 1.325 1.275 1.225 Vtpwr=2.8V 1.175 1.125 1.125 2.5 3.5 4.5 Vtpwr -20 5.5 0.125 0.12 T=-10ºC 0.115 0.11 Vdm(V) Vdm(V) 100 0.125 0.12 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 - Vtpwr @Temperature=24ºC 0 20 40 60 80 Temperature(ºC) 100 Common Mode Termination Resistance Rcm - Temperature@Vtpwr=5V 190 190 180 180 170 170 Rcm(Ohm) Rcm(Ohm) 20 40 60 80 Temperature(ºC) Differential Mode Bias Vdm Temperature@Vtpwr=5V Differential Mode Bias Vdm - Vtpwr 160 150 140 160 150 140 130 130 120 120 110 110 2.5 3.5 4.5 Vtpwr 5.5 -20 Differential Mode Termination Resistance Rdm - 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 - Temperature 110 T=80ºC Vtpwr=2.8V 108 Rdm(Ohm) Rdm(Ohm) 0 T=-10ºC 106 104 Vtpwr=5.8V 102 100 2.5 3.5 4.5 Vtpwr 5.5 -20 Ver: 0.1 Preliminary Apr 03, 2003 0 20 40 60 80 Temperature(ºC) 100 TEL: 886-3-5788833 http://www.gmt.com.tw 6 G220 Global Mixed-mode Technology Inc. SE Termination Resistance Rse Vtpwr @Vline=0V SE Termination Resistance Rse Vtpwr @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 SE Termination Resistance Rse Vtpwr @Vtpwr=5V;T=24ºC 20 40 60 80 100 Vref - Ivref@Vtpwr=5V 2.93 115 2.91 113 2.89 111 Vref Rse(Ohm) 0 Temperature(ºC) Vtpwr 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 2.91 2.89 2.87 2.87 Vref 2.89 2.85 2.85 2.81 2.81 2.79 2.79 0 20 40 Ivref=0mA 2.83 Vtpwr=3.8V -20 Ivref=-200mA 2.91 Vtpwr=5.8V 2.83 150 250 350 Vref - Vtpwr@T=24ºC Vref - Temperature@Ivref=0mA 2.93 Vref 50 Ivref(mA) Vline 60 80 Ivref=360mA 3.5 100 Temperature(ºC) 4.5 5.5 Vtpwr 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 SYMBOL 1 VREF 2-5,7-12, 18-25 Rx+, Rx- 6 13 14 15 16 17 26 27 28 G220 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 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 G220 Global Mixed-mode Technology Inc. Package Information C D 28 L E1 E 1 θ A2 A 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 SYMBOL A A1 A2 b C D E E1 e L y θ MIN. DIMENSION IN MM NOM. MAX. MIN. DIMENSION IN INCH NOM. MAX. ----0.05 0.80 0.19 0.09 9.60 ----4.30 ----0.45 ----0º --------1.00 --------9.70 6.40 4.40 0.65 0.60 --------- 1.20 0.15 1.05 0.30 0.20 9.80 ----4.50 ----0.75 0.10 8º ----0.002 0.031 0.007 0.004 0.378 ----0.169 ----0.018 ----0º --------0.039 --------0.382 0.252 0.173 0.026 0.024 --------- 0.048 0.006 0.041 0.012 0.008 0.386 ----0.177 ----0.030 0.004 8º 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