G218AT-S5

Global Mixed-mode Technology Inc. G218A 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 standards. Supports active negation Current limit and thermal protection Hot-Swap compatible (Single-Ended) 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 General Description The G218A Multi-mode LVD/SE SCSI terminator provides a smooth transition into the next generation of the SCSI Parallel Interface (SPI-2). 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 G218A detects a HVD SCSI device, it switches to a high impedance state. For a 16-bit Wide SCSI bus to be operational, three G218A terminators are needed. The Multi-mode terminator contains all functions required to terminate and auto detect and switch modes for SCSI parallel Interface (SPI-2) bus architectures. For the SE termination, one regulator and nine precision 110ohm resistors are used. For the LVD termination, the G218A integrates two regulated supplies with nine precision resistor strings. Applications Server and workstation High-end PC Industrial PC Disk Array (RAID) SCSI cable Pin Configuration (Top View) G218A G218A VREF R1+ R1R2+ R2NC 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 R7R7+ R6R6+ DIFFB DIFFSENSE M/S VREF NC NC NC R1+ R1R2+ R2HS/GND 1 2 3 4 5 6 7 8 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 TPWR HVD LVD SE R9R9+ R8R8+ HS/GND HS/GND HS/GND R7R7+ R6R6+ DIFFB DIFFSENSE M/S HS/GND 9 HS/GND 10 R3+ R3R4+ R4R5+ R5DISCNCT 11 12 13 14 15 16 17 GND 18 28Pin SSOP/TSSOP Ver 3.3 Sep 11, 2001 36Pin SSOP TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Ordering Information PART NUMBER G218AT-S4 G218AR-S4 G218AT-S5 G218AR-S5 G218AT-D3 G218AR-D3 G218A 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 TEMP. RANGE 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC 0ºC-70ºC PIN-PACKAGE SSOP-28 pin / Tube SSOP-28 pin / Tape & Reel SSOP-36 pin / Tube SSOP-36 pin / Tape & Reel TSSOP-28 pin / Tube TSSOP-28 pin / Tape & Reel Functional Description The G218A combines LVD and SE termination with DIFFSENS sourcing and detection. The LVD termination section consists of two 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) DIFFSENSE is used by multi-mode transceiver (LVD/SE) to determine if the device is connected to a single-ended, LVD or HVD SCSI bus. If the voltage on DIFFSENSE 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 G218A 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. HVD Isolation Mode The G218A identifies that there is an HVD (high voltage differential) device on the SCSI bus and isolates the termination pins from the bus. When DISCNCT=1, 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 and VDD 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 G218A. The G218A should be placed as close as possible to the SCSI connector to minimize signal and The DIFFSENSE pin can also drive the SCSI DIFFSENS line (when M/S=1) to determine the SCSI bus operating mode. The G218A 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. power trace length, thereby resulting in less input capacitance and reflections which can degrade the bus signals. To maintain the specified regulation, a 4.7µF capacitor is required between the VREF pin and ground of each G218A. 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 G218A will be terminating the bus if the DISCNCT pin is left floating. Note: DIFFSENSRefers to the SCSI bus signal. DIFFSENSERefers to the G218A pin name and internal circuitry relating to differential sensing. DIFFBRefers to the G218A pin name and internal circuitry relating to monitoring the DIFFSENS line. Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 2 Global Mixed-mode Technology Inc. G218A Block Diagram (Figure 1) G218A ( 36pin SSOP only ) DIFFSENSE SE LVD HVD DISCNCT M/S THERMAL SHUTDOWN CIRCUITRY DIFFB DIFFB DIFFSENSE CIRCUITRY SE LVD HVD CONTROL LOGIC VREF + _ VREF 110 Ohms R1- R9110 Ohms BANDGAP REFERENCE + _ VTOP RTOP R1R1R9R9RMID R1+ R1+ R9+ R9+ RBOT + _ VBOT SE GND DRIVER Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. SCSI Bus Configuration (Figure 2) G218A TERMPWR 2.2µF TPWR M/S DISCNCT CONTROL LINES (9) TPWR M/S DISCNCT TERMPWR 2.2µF G218A G218A DIFFSENSE VREF DIFFB 20K 4.7µF 0.1µF DIFFSENS DIFFSENSE DIFFB VREF 20K 0.1µF 4.7µF 2.2µF TPWR M/S DISCNCT DATA LINES (9) TPWR M/S DISCNCT 2.2µF G218A G218A G218A VREF DIFFB DIFFB VREF 4.7µF 2.2µF TPWR M/S DISCNCT DATA LINES (9) 4.7µF TPWR M/S DISCNCT 2.2µF G218A G218A VREF DIFFB DIFFB VREF 4.7µF 4.7µF Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 4 Global Mixed-mode Technology Inc. Pin Description PIN 1 2-5,7-12, 18-21, 23-26 6,22 13 14 15 16 17 27,28 VREF* G218A (for 28pin SSOP) DESCRIPTION Reference Voltage. 2.85-volt reference; a regulator bypass, 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. No Connect. Do not connect these pins. Disconnect. When pulled high, the G218 isolates its bus pins (Rx+, Rx-) from the SCSI bus. Ground. Terminator ground pin. Connected to ground. Master/slave. Used to select which terminator is the controlling device. M/S pin high enables the DIFFSENSE driver. SYMBOL Rx+, Rx- NC DISCNCT GND M/S 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. 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. (36pin SSOP) PIN 1 2,3 4-7,11-16, 22-25, 29-32 8, 9,10,26, 27,28 17 18 19 20 21 33 34 35 36 SYMBOL VREF* NC Rx+ RxHS/GND DISCNCT GND DESCRIPTION Reference Voltage. 2.85-volt reference; a regulator bypass, 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 capability. Disconnect. When pulled high, the G218 isolates its bus pins (Rx+, Rx-) from the SCSI bus. Ground. Terminator ground pin. Connected to ground. Master/slave. Mode select for the non controlling terminator. M/S MSTR enables the 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 LVD HVD TPWR Single ended mode indicator. It is HIGH when terminator is operating in SE mode. Low Voltage Differential mode indicator. It is HIGH when terminator is operating in LVD mode. High Voltage Differential mode indicator. It is HIGH when terminator is operating in HVD mode or thermal shutdown. Terminator Power. Connect to SCSI bus TERMPWR line and decouple with 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 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 5 Global Mixed-mode Technology Inc. Recommended Operating Conditions PARAMETER Termpower Voltage Logic 0 Logic 1 Operating Temperature G218A MAX 5.50 +0.8 Vtpwr+0.3 70 SYMBOL Vtpwr Vil Vih Tamb MIN 4.5 -0.3 2.0 0 TYP 5 UNITS V V V °C NOTES Single Ended Characteristics PARAMETER SE Termination Resistance SE Voltage Reference SE output Current (0°C to 70°C) SYMBOL Rse Vref Iose MIN 104.5 2.79 TYP 110 2.85 MAX 115.5 2.93 25.4 UNITS Ohms Volts mA NOTES Vline = 0-3.0 volts Vline = 0.2 volts Low Voltage Differential Characteristics PARAMETER Differential Mode Termination Resistance Common Mode Termination Resistance Differential Mode Bias Common Mode Bias (0°C to 70°C) MIN 100 110 100 1.125 SYMBOL Rdm Rcm Vdm Vcm TYP 105 150 112 1.25 MAX 110 190 125 1.375 UNITS Ohms Ohms mV V NOTES All lines Open DC Characteristics PARAMETER Termpower Current Input Leakage High Input Leakage Low Output Current High Output Current Low DIFFSENS SE Operating Range DIFFSENS LVD Operating Range DIFFSENS HVD Operating Range DIFFSINS Driver Output Voltage DIFFSENSE Driver Source Current DIFFSENSE Driver Sink Current (0°C to 70°C) SYMBOL Itpmr Iih Iil Ioh Iol Vseor Vlvdor Vhvdor Vdso Idsh Idsl MIN -1.0 TYP 35 MAX UNITS mA µA NOTES All lines Open 1.0 -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 mA mA V V V V mA µA 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 Regulator Characteristics PARAMETER Line Regulation Load Regulation Current Limit Sink Current (0°C to 70°C) SYMBOL LIREG LOREG ILIM ISINK 200 MIN TYP 1.0 1.3 350 MAX 2.0 3.0 UNITS % % mA mA NOTES Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 6 Global Mixed-mode Technology Inc. Package Information (28 pin SSOP) 0.25 G218A C D 28 L E1 E 1.00 REF 1 θ A2 A1 b e A Symbol A A1 A2 b C D E E1 e L y θ Min. 1.35 0.10 ----0.20 0.19 9.80 5.80 3.80 ----0.40 ----0º Dimension in mm Typ. 1.60 ----1.45 0.25 ----------------0.64 ------------- Max. 1.75 0.25 ----0.30 0.25 10.00 6.20 4.00 ----1.27 0.10 8º Min. 0.053 0.004 ----0.008 0.007 0.386 0.228 0.150 ----0.016 ----0º Dimension in inch Typ. 0.064 ----0.057 0.010 ----------------0.025 ------------- Max. 0.069 0.010 ----0.012 0.010 0.394 0.244 0.157 ----0.050 0.004 8º Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 7 Global Mixed-mode Technology Inc. 36 pin SSOP C G218A L E1 E h x 45° θ D A 0.004 C SEATING PLANE e b A1 Symbol A A1 b c D e E E1 h L θ Min. 2.413 0.203 0.300 0.127 15.748 10.033 7.391 0.381 0.508 0 Dimension in mm Typ. 2.591 0.305 Max. 2.794 0.406 0.450 0.254 16.002 10.668 7.595 0.635 1.016 8 Min. 0.095 0.008 0.012 0.005 0.620 0.395 0.291 0.015 0.020 0 Dimension in inch Typ. 0.102 0.012 Max. 0.110 0.016 0.018 0.010 0.630 0.420 0.289 0.025 0.040 8 15.875 0.800 BASIC 7.493 0.625 0.032 BASIC 0.295 Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 8 Global Mixed-mode Technology Inc. 28 pin TSSOP D 28 C G218A 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 millimeter converted inch dimensions are not necessarily exact. 5. Followed from 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 Direction Typical SSOP, TSSOP Package Orientation Ver 3.3 Sep 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 9