G218B Global Mixed-mode Technology Inc. Ultra160 Multi-mode LVD/SE SCSI Terminator Features General Description The G218B Multi-mode LVD/SE SCSI terminator provides a smooth transition into the next generation of the SCSI Parallel Interface (SPI-3). 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 G218B detects a HVD SCSI device, it switches to a high impedance state. For a 16-bit Wide SCSI bus to be operational, three G218B terminators are needed. 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) standards. Supports active negation 3pF channel capacitance Thermal protection Hot-Swap compatible 5% tolerance on SE and LVD termination resistance 28 and 36 pin SSOP package 28 Pin SSOP: Pin Compatible with DS2119 36 Pin SSOP: Pin Compatible with DS2118, LX5241 and UCC5630 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 G218B 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 G218B G218B VREF 1 28 TPWR R1+ 2 27 R1- 3 26 TPWR R9- R2+ R2- 4 25 R9+ 5 24 R8- NC/HS GND 6 23 R8+ R3+ 7 22 NC/HS GND VREF 1 36 NC 2 35 HVD NC 3 34 LVD R1+ 4 33 SE R1- 5 32 R9- R2+ 6 31 R9+ R2- 7 30 R8- HS/GND 8 29 HS/GND TPWR 9 28 R8+ HS/GND 27 HS/GND R6- HS/GND 10 R3+ 11 26 HS/GND 18 R6+ R3- 12 25 R7- 12 17 DIFFB R4+ 13 24 R7+ DISCNCT 13 16 DIFFSENSE R4- 14 23 R6- GND 14 15 M/S R5+ 15 22 R6+ R5- 16 21 DIFFB DISCNCT 17 20 DIFFSENSE GND 18 19 M/S R3- 8 21 R7- R4+ 9 20 R7+ R4- 10 19 R5+ 11 R5- SSOP-28/TSSOP-28 SSOP-36 Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. G218B Ordering Information ORDER NUMBER ORDER NUMBER (Pb free) TEMP. RANGE G218BT-S4 G218BR-S4 G218BT-S5 G218BR-S5 G218BT-D3 G218BR-D3 G218BT-S4f G218BR-S4f G218BT-S5f G218BR-S5f G218BT-D3f G218BR-D3f 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC PACKAGE SSOP-28 / Tube SSOP-28 / Tape & Reel SSOP-36 / Tube SSOP-36 / Tape & Reel TSSOP-28 / Tube TSSOP-28 / Tape & Reel FEATURE DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF DISCNCT does not disable VREF Note: DIFFSENS⎯Refers to the SCSI bus signal. DIFFSENSE⎯Refers to the G218B pin name and internal circuitry relating to differential sensing. DIFFB⎯Refers to the G218B pin name and internal circuitry relating to monitoring the DIFFSENS line. Functional Description and ground and placed as close as possible to the G218B. The G218B should be placed as close as possible to the SCSI connector to minimize signal and power trace length, thereby resulting in less input capacitance and reflections which can degrade the bus signals. The G218B 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 G218B switches to the termination mode that is appropriate for the bus based on the value of the DIFFSENS voltage. These modes are: 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. 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. The G218B DIFFB pin monitors the DIFFSENS line to determine the proper operating mode of the device; this mode is indicated by the SE/LVD/HVD outputs. 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. HVD Isolation Mode The G218B 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 G218B. 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 the bus mode indicators (SE/LVD/HVD) as well as VREF remains active. During thermal shutdown, the termination pins are isolated from the SCSI bus and VREF becomes high impedance. 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 An internal pull down resistor assures that the G218B will be terminating the bus if the DISCNCT pin is left floating. Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 2 G218B Global Mixed-mode Technology Inc. Block Diagram (Figure 1) ( 36pin SSOP only ) M/S DIFFSENSE SE LVD HVD DISCNCT 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+ R9+ RBOT1 + _ RBOT9 VBOT1 X9 SE GND DRIV ER Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 3 G218B Global Mixed-mode Technology Inc. SCSI Bus Configuration (Figure 2) CONTROL LINES (9) TERMPWR 2.2µF TERMPWR TPWR M/S DISCNCT TPWR M/S DISCNCT G218B G218B DIFFSENS DIFFSENSE VREF 20K 20K 2.2µF DIFFSENSE DIFFB VREF DIFFB 0.1µF 0.1µF 4.7µF 4.7µF DATA LINES (9) TPWR TPWR M/S M/S DISCNCT G218B DIFFB DIFFB VREF 4.7µF 4.7µF 2.2µF 2.2µF DISCNCT G218B VREF 2.2µF DATA LINES (9) TPWR TPWR M/S M/S DISCNCT DISCNCT G218B VREF 2.2µF G218B DIFFB DIFFB VREF 4.7µF 4.7µF Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 4 G218B Global Mixed-mode Technology Inc. Recommended Operating Conditions PARAMETER Termpower Voltage Logic 0 Logic 1 Operating Temperature SYMBOL MIN TYP MAX Vtpwr (SE) 4.0 2.9 -0.3 2.0 0 5 5 ------- 5.5 5.5 +0.8 Vtpwr+0.3 70 Vtpwr (LVD) Vil Vih Tamb 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 SYMBOL Condition MIN TYP MAX UNITS 100 110 100 1.125 105 150 112 1.25 110 190 125 1.375 Ohms 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 mA LVD Terminator Section Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias Common Mode Bias Single Ended Terminator Section Rdm Rcm Vdm Vcm Output Capacitance SE Termination Resistance SE Voltage Reference SE output Current Regulator Section Cout Rse Vref Iose Line Regulation Load Regulation Current Limit Sink Current DC Section Note Vline = 0-3.0 volts Vline = 0.2 volts LIREG LOREG ILIM ISINK Termpower Current Itpmr Input Leakage High Input Leakage Low Output Current High Output Current Low DIFFSENS Section Iih Iil Ioh Iol DIFFSENS SE Operating Range DIFFSENS LVD Operating Range DIFFSENS HVD Operating Range DIFFSENSE Driver Output Voltage DIFFSENSE Driver Source Current DIFFSENSE Driver Sink Current All lines Open Vseor Vlvdor Vhvdor Vdso Idsh Idsl 1.0 1.3 350 200 SE mode (No Load) 4 LVD mode (No Load) 20 mA -1.0 1.0 Vout = 2.4 volts;SE/LVD/HVD Pins only Vout=0.4 volts;SE/LVD/HVD Pins only M/S=1; Ids = 0-5mA M/S = 1; Vdso=0V M/S=1; Vdso=2.75V -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 µA µA mA mA V V V V mA µA Note: Guaranteed by Design. Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 5 G218B Global Mixed-mode Technology Inc. Typical Operating Characteristics Common Mode Bias Vcm Temperature Common Mode Bias Vcm - Vtpwr 1.375 1.375 1.325 T=80ºC 1.275 Vcm(V) Vcm(V) 1.325 1.225 T=-10ºC 1.175 Vtpwr=5.8V 1.275 1.225 Vtpwr=2.8V 1.175 1.125 1.125 2.5 3.5 4.5 Vtpwr -20 5.5 0 20 40 60 80 Temperature(℃) 100 Differential Mode Bias Vdm Temperature @Vtpwr=5V Differential Mode Bias Vdm - Vtpwr 0.125 0.125 0.12 0.12 0.115 Vdm(V) Vdm(V) T=-10ºC 0.11 0.115 0.11 T=80ºC 0.105 0.105 0.1 0.1 2.5 3.5 4.5 Vtpwr 5.5 -20 190 190 180 180 170 170 Rcm(Ohm) Rcm(Ohm) 20 40 60 Temperature(ºC) 80 100 Common Mode Termination Resistance Rcm - Temperature@Vtpwr=5V Common Mode Termination Resistance Rcm - Vtpwr@Temperature=24ºC 160 150 140 160 150 140 130 130 120 120 110 110 2.5 3.5 4.5 Vtpwr 5.5 -20 110 108 108 Rdm(Ohm) 110 106 0 20 40 60 80 Temperature(ºC) 100 Differential Mode Termination Resistance Rdm - Temperature Differential Mode Termination Resistance Rdm - Vtpwr Rdm(Ohm) 0 T=80ºC 104 Vtpwr=2.8V 106 104 102 102 T=-10ºC 100 2.5 3.5 4.5 Vtpwr Vtpwr=5.8V 100 -20 5.5 Ver 1.4 Apr 07, 2005 0 20 40 60 Temperature(ºC) 80 100 TEL: 886-3-5788833 http://www.gmt.com.tw 6 G218B Global Mixed-mode Technology Inc. Rse(Ohm) 115 114 113 112 111 110 109 108 107 106 105 Rse(Ohm) 3.5 4.5 Vtpwr 5.5 SE Termination Resistance Rse - Vtpwr @Vtpwr=5V;T=24ºC 115 114 113 112 111 110 109 108 107 106 105 0 1 2 3 Vline SE Termination Resistance Rse - Vtpwr @Vline=0V 115 114 113 Vtpwr=3.8V 112 111 110 109 108 107 Vtpwr=5.8V 106 105 -20 0 20 40 60 80 100 Temperature(ºC) Vref - Ivref@Vtpwr=5V;T=24ºC 2.93 2.91 2.89 Vref Rse(Ohm) SE Termination Resistance Rse - Vtpwr @T=24ºC;Vline=0V 2.87 2.85 2.83 2.81 2.79 -250 -150 Vref - Temperature@Ivref=0mA 50 150 Ivref(mA) 250 350 Vref - Vtpwr@T=24ºC 2.93 2.93 2.91 2.91 2.89 2.89 Vtpwr=5.8V 2.87 Vref Vref -50 2.85 2.83 2.87 Ivref=-200mA 2.85 2.83 2.81 Ivref=350mA 2.81 Vtpwr=3.8V 2.79 2.79 -20 0 20 40 60 Temperature(ºC) 80 100 3.5 4.5 5.5 6.5 Vtpwr Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 7 G218B Global Mixed-mode Technology Inc. Pin Description PIN (for 28pin SSOP/TSSOP) SYMBOL DESCRIPTION Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor. Signal Termination. (X=1,2,3,…..9) 2-5,7-12, Rx+: Ground line for single-ended or positive line for differential applications for the SCSI bus. Rx+, Rx18-21, 23-26 Rx-: Signal line/active line for single-ended or negative line in differential applications for the SCSI bus. 6,22 NC/ HS GND No Connect/ HS GND. Should be grounded for heat sinking purpose. 13 DISCNCT Disconnect. When pulled high, the G218B isolates its bus pins (Rx+, Rx-) from the SCSI bus. Ground. Terminator ground pin. Connected to ground. 14 GND Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the 15 M/S DIFFSENSE driver. 16 DIFFSENSE Output to drive the SCSI bus DIFFSENS line. 1 VREF* 17 DIFFB 27,28 TPWR 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. 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. (36pin SSOP) PIN SYMBOL 1 2,3 4-7,11-16, 22-25, 29-32 8, 9,10,26, 27,28 17 18 VREF* NC 19 20 21 33 34 35 36 DESCRIPTION Reference Voltage. 2.85-volt reference; must be connected to a 4.7µF capacitor. No Connect. Do not connect these pins. 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. Heat Sink Ground. Connect to large area PC board traces to increase power dissipation capabilHS/GND ity. DISCNCT Disconnect. When pulled high, the G218 isolates its bus pins (Rx+, Rx-) from the SCSI bus. Ground. Terminator ground pin. Connected to ground. GND 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. Single ended mode indicator. It is HIGH when terminator is operating in SE mode. SE Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode. LVD High Voltage Differential mode indicator. It is HIGH when terminator is operating in HVD mode HVD Terminator Power. Connect to SCSI bus TERMPWR line and decouple with 2.2µF capacitor. TPWR Rx+ Rx- *The VREF keeps the level at 2.85 volt, despite the DISCNCT pin is asserted or not; even the termination mode is changed. Ver 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 8 G218B Global Mixed-mode Technology Inc. Package Information 0.25 C D L 28 E1 E 1.00 REF 1 θ A2 A A1 b e SSOP-28 Package MIN. DIMENSION IN MM TYP. MAX. MIN. DIMENSION IN INCH TYP. A A1 1.35 0.10 1.60 ----- 1.75 0.25 0.053 0.004 0.064 ----- 0.069 0.010 A2 b ----0.20 1.45 0.25 ----0.30 ----0.008 0.057 0.010 ----0.012 C D 0.19 9.80 --------- 0.25 10.00 0.007 0.386 --------- 0.010 0.394 E E1 e L y θ 5.80 3.80 ----0.40 ----0º --------0.64 ------------- 6.20 4.00 ----1.27 0.10 8º 0.228 0.150 ----0.016 ----0º --------0.025 ------------- 0.244 0.157 ----0.050 0.004 8º SYMBOL Ver 1.4 Apr 07, 2005 MAX. TEL: 886-3-5788833 http://www.gmt.com.tw 9 G218B Global Mixed-mode Technology Inc. C L E1 E h x 45° θ D A A1 0.004 C SEATING PLANE b e SSOP-36 Package MIN. Dimension in mm TYP. MAX. MIN. Dimension in inch TYP. A 2.413 2.591 2.794 0.095 0.102 0.110 A1 b 0.203 0.300 0.305 ---- 0.406 0.450 0.008 0.012 0.012 ---- 0.016 0.018 c D 0.127 15.748 ---15.875 0.254 16.002 0.005 0.620 ---0.625 0.010 0.630 e E E1 h L θ 10.033 7.391 0.381 0.508 0 0.800 BASIC ---7.493 ---------- 10.668 7.595 0.635 1.016 8 0.395 0.291 0.015 0.020 0 0.032 BASIC ---0.295 ---------- 0.420 0.289 0.025 0.040 8 Symbol Ver 1.4 Apr 07, 2005 MAX. TEL: 886-3-5788833 http://www.gmt.com.tw 10 G218B Global Mixed-mode Technology Inc. C D 28 L E1 E 1 θ A A2 A1 e b TSSOP-28 Package 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 MIN. DIMENSION IN MM NOM. MAX. MIN. DIMENSION IN INCH NOM. A A1 ----0.05 --------- 1.20 0.15 ----0.002 --------- 0.048 0.006 A2 b C D E E1 e L y θ 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 --------- 1.05 0.30 0.20 9.80 ----4.50 ----0.75 0.10 8º 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 --------- 0.041 0.012 0.008 0.386 ----0.177 ----0.030 0.004 8º SYMBOL MAX. Taping Specification PACKAGE Q’TY/REEL Q’TY/TUBE SSOP-28 SSOP-36 TSSOP-28 2,500 ea 1,000 ea 2,500 ea 50 ea 29 ea 50 ea F e e d D ire c tio n T yp ic a l S S O P , T S S O P P a c k a g e O rie n ta tio n 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 1.4 Apr 07, 2005 TEL: 886-3-5788833 http://www.gmt.com.tw 11