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| L I N DOC # : 5218 UltraMAX T HE TM LX5218 AND 9-CHANNEL PLUG I NFINITE P L AY S C S I T E R M I N AT O R D ATA P OWER OF I N N O VAT I O N P RODUCTION S HEET DESCRIPTION The LX5218 SCSI terminator is part of Linfinity's UltraMAX family of high-performance, adaptive, nonlinear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in their design offers superior performance to older linear passive and active techniques. Linfinity's UltraMAX architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible -- typically 35MHz, which is 100 times faster than the older linear regulator/terminator approach used by other manufacturers. Products using this older linear regulator approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). The UltraMAX architecture also eliminates the output compensation capacitor typical in earlier terminator designs. It is approved for use with SCSI1, -2, -3, UltraSCSI and beyond -- providing the highest performance alternative available today. Another key improvement offered by the LX5218 lies in its ability to insure reliable, error free communications even in systems which do not adhere to recommended SCSI hardware design guidelines, such as the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem. The LX5218 architecture is much more tolerant of marginal system integrations. The LX5218 has two disconnect pins for SCSI Plug and Play (PnP) applications. Quiescent current is typically less than (275A) in disable mode, while the output capacitance is also less than 3pF. The obvious advantage of extended battery life for portable systems is inherent in the product's sleepmode feature. Additionally, the disable function permits factory-floor or production-line configurability, reducing inventory and product-line diversity costs. Field configurability can also be accomplished without physically removing components which, often times results in field returns due to mishandling. Reduced component counts is also inherent in the LX5218 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20F in value and size. The LX5218 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs. K E Y F E AT U R E S s SCSI PLUG AND PLAY, DUAL LOW DISCONNECT, LOGIC LOW COMMAND DISCONNECTS ALL TERMINATION LINES s HOT SWAP COMPATIBLE s ULTRA-FAST RESPONSE FOR FAST-20 SCSI APPLICATIONS s 35MHz CHANNEL BANDWIDTH s 3.5V OPERATION s LESS THAN 3pF OUTPUT CAPACITANCE s DISABLE-MODE CURRENT LESS THAN 275A s THERMALLY SELF LIMITING s NO EXTERNAL COMPENSATION CAPACITORS s IMPLEMENTS 8-BIT OR 16-BIT (WIDE) APPLICATIONS s COMPATIBLE WITH ACTIVE NEGATION DRIVERS (60mA / CHANNEL) s COMPATIBLE WITH PASSIVE AND ACTIVE TERMINATIONS s APPROVED FOR USE WITH SCSI-1, -2, -3 AND ULTRASCSI s CONSULT FACTORY FOR APPLICATION TEST REPORT IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com. PRODUCT HIGHLIGHT R E C E I V I N G W AV E F O R M - 2 0 M HZ D R I V I N G WAV E F O R M - 2 0 M HZ Receiver 1 Meter, AWG 28 LX5218 LX5268 Driver LX5218 LX5268 PA C K A G E O R D E R I N F O R M AT I O N TJ (C) 0 to 70 DW Plastic SOWB 16-pin LX5218CDW PW Plastic TSSOP 20-pin LX5218CPW NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus" Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5218CDWT) Copyright (c) 1997 Rev. 1.7 12/97 LINFINITY MICROELECTRONICS INC. 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5218 9-CHANNEL PLUG P AND UltraMAX P L AY S C S I T E R M I N A T O R D ATA RODUCTION S HEET A B S O L U T E M A X I M U M R AT I N G S (Note 1) PA C K A G E P I N O U T S TERM POWER N.C. D0 D1 D2 D3 D4 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Continuous Termination Voltage .......................................................................... 10V Continuous Output Voltage Range .............................................................. 0 to 5.5V Continuous Disable Voltage Range ............................................................. 0 to 5.5V Operating Junction Temperature ........................................................... 0C to 125C Storage Temperature Range ............................................................. -65C to +150C Solder Temperature (Soldering, 10 seconds) ................................................... 300C Note 1. Exceeding these ratings could cause damage to the device. TERM POWER DISC1 DISC2 D8 D7 D6 D5 GND T H E R M A L D ATA DW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA PW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 95C/W 144C/W TERM POWER N.C. N.C. D0 D1 D2 D3 D4 N.C. GND DW PACKAGE (Top View) 20 2 3 4 5 6 7 8 9 10 19 18 17 16 15 14 13 12 11 Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. TERM POWER DISC1 DISC2 D8 D7 N.C. D6 D5 N.C. GND PW PACKAGE (Top View) 2 Copyright (c) 1997 Rev. 1.7 12/97 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX 9-CHANNEL PLUG P AND LX5218 P L AY S C S I T E R M I N AT O R D ATA RODUCTION S HEET R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter Termination Voltage High Level Disable Input Voltage Low Level Disable Input Voltage Operating Virtual Junction Temperature Range LX5218C Note 2. Range over which the device is functional. (Note 2) Symbol VTERM VIH VIL Recommended Operating Conditions Min. Typ. Max. 3.5 2 0 0 5.5 VTERM 0.8 125 Units V V V C ELECTRICAL CHARACTERISTICS Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. Parameter Output High Voltage TermPwr Supply Current Symbol VOUT ICC Test Conditions Min. 2.65 LX5218 Typ. Max. 2.85 6 215 275 -23 90 -10 10 3 35 60 9 225 -24 Units V mA mA A mA A nA nA pF MHz mA Output Current Disable Input Current Output Leakage Current Capacitance in Disabled Mode Channel Bandwidth Termination Sink Current, per Channel IOUT IIN IOL COUT BW I SINK All data lines = open All data lines = 0.5V DISC1 Pin = DISC2 Pin = 0V VOUT = 0.5V DISC1 Pin = DISC2 Pin = 4.75V DISC1 Pin = DISC2 Pin = 0V DISC1 Pin = DISC2 Pin = 0V, V O = 0.5V VOUT = 0V, frequency = 1MHz VOUT = 4V -21 Copyright (c) 1997 Rev. 1.7 12/97 3 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5218 9-CHANNEL PLUG P AND UltraMAX P L AY S C S I T E R M I N A T O R D ATA RODUCTION S HEET BLOCK DIAGRAM TERM POWER THERMAL LIMITING CIRCUIT CURRENT BIASING CIRCUIT 24mA CURRENT LIMITING CIRCUIT DATA OUTPUT PIN DB(0) 2.85V DISC1 DISC2 1 OF 9 CHANNELS FUNCTIONAL DESCRIPTION Cable transmission theory suggests to optimize signal speed respond to line demands by delivering 24mA on assertion and and quality, the termination should act both as an ideal voltage by imposing 2.85V on deassertion. In order to disable the reference when the line is released (deasserted) and as an device, the DISC1 and DISC2 pins must be driven logic Low. ideal current source when the line is active (asserted). This mode of operation places the device in a sleep state where Common active terminators, a meager 275A of quiescent curwhich consist of Linear Regulators rent is consumed. Additionally, all POWER UP / POWER DOWN FUNCTION TABLE in series with resistors (typically outputs are in a Hi-Z (impedance) 110), are a compromise. As the state. Sleep mode can be used for Quiescent DISC1 DISC2 Outputs line voltage increases, the amount power conservation or to comCurrent of current decreases linearly by the pletely eliminate the terminator H H Enabled 6mA equation V = I * R. The LX5218, from the SCSI chain. In the second H L Enabled 6mA with its unique new architecture case, termination node capacitance L H Enabled 6mA applies the maximum amount of is important to consider. The tercurrent regardless of line voltage minator will appear as a parasitic L L Disabled 275A until the termination high threshdistributed capacitance on the line, Open Open Enabled 6mA old (2.85V) is reached. which can detract from bus perActing as a near ideal line terformance. For this reason, the minator, the LX5218 closely reproduces the optimum case LX5218 has been optimized to have only 3pF of capacitance when the device is enabled. To enable the device the DISC1 per output in the sleep state. and DISC2 Pins must be pulled logic High, Open, or any An additional feature of the LX5218 is its compatibility with combination of both High and Low. During this mode of active negation drivers. The device handles up to 60mA of operation, quiescent current is 6mA and the device will sink current for drivers which exceed the 2.85V output high. 4 Copyright (c) 1997 Rev. 1.7 12/97 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX 9-CHANNEL PLUG P AND LX5218 P L AY S C S I T E R M I N AT O R D ATA RODUCTION S HEET GRAPH / CURVE INDEX FIGURE INDEX Waveforms FIGURE # 1A. RECEIVING WAVEFORM (Freq. = 1.0MHz) 1B. DRIVING WAVEFORM 2A. RECEIVING WAVEFORM (Freq. = 5.0MHz) 2B. DRIVING WAVEFORM 3. 4. 10MHz WAVEFORM 20MHz WAVEFORM FIGURE # Application Circuits 16. 8-BIT SCSI SYSTEM APPLICATION Characteristic Curves FIGURE # 5. 6. 7. 8. 9. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE OUTPUT CURRENT vs. JUNCTION TEMPERATURE OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 4.75V) OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 3.3V) TERMINATION VOLTAGE vs. SUPPLY CURRENT 10. TERMPWR SUPPLY CURRENT vs. TERMINATION VOLTAGE (Disabled) -- LX5218 11. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE (VT = 3.3V) 12. OUTPUT CURRENT vs. JUCTION TEMPERATURE (VT = 3.3V) 13. OUTPUT HIGH VOLTAGE vs. TERMINATION VOLTAGE 14. OUTPUT CURRENT vs. TERMINATION VOLTAGE 15. OUTPUT CURRENT MATCHING CHANNEL TO CHANNEL Copyright (c) 1997 Rev. 1.7 12/97 5 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5218 9-CHANNEL PLUG P AND UltraMAX P L AY S C S I T E R M I N A T O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 1A. -- RECEIVING WAVEFORM 3.5 FIGURE 1B. -- DRIVING WAVEFORM 3.5 freq.=1.03844MHz 3 2.5 3 2.5 freq.=1.00266MHz Line Voltage - (V) 2 1.5 1 0.5 GND -0.5 Line Voltage - (V) Time - (250ns/Div.) END-DRIVEN CABLE 2 1.5 1 0.5 GND -0.5 Time - (250ns/Div.) Receiver Fig. 1A 6 Meter, 92W LX5218 75C08 Driver Fig. 1B LX5218 75C08 6 Copyright (c) 1997 Rev. 1.7 12/97 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX 9-CHANNEL PLUG P AND LX5218 P L AY S C S I T E R M I N AT O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 2A. -- RECEIVING WAVEFORM 3.5 FIGURE 2B. -- DRIVING WAVEFORM 3.5 freq.=5.0092MHz 3 2.5 3 2.5 freq.=4.9961MHz Line Voltage - (V) Line Voltage - (V) 2 1.5 1 0.5 GND -0.5 2 1.5 1 0.5 GND -0.5 Time - (50ns/Div.) END-DRIVEN CABLE Time - (50ns/Div.) Receiver Fig. 2A 6 Meter, 92W LX5218 75C08 Driver Fig. 2B LX5218 75C08 Copyright (c) 1997 Rev. 1.7 12/97 7 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5218 9-CHANNEL PLUG P AND UltraMAX P L AY S C S I T E R M I N A T O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 3. -- 10MHz WAVEFORM 4 Ch2 Freq.=10.096MHz 3 2 FIGURE 4. -- 20MHz WAVEFORM 4 Ch2 Freq.=20.020MHz 3 2 #1 #2 Line Voltage - (V) Line Voltage - (V) #2 1 1 0 4 #1 0 #3 4 #3 GND GND Time - (20ns/Div.) END-DRIVEN CABLE Time - (10ns/Div.) 4.75V LX5218 1 6 Meter, 72W 2 4.75V LX5218 LX5268 LX5268 3 8 Copyright (c) 1997 Rev. 1.7 12/97 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX 9-CHANNEL PLUG P AND LX5218 P L AY S C S I T E R M I N AT O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 5. -- OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP. 4.5 FIGURE 6. -- OUTPUT CURRENT vs. JUNCTION TEMP. 30 (VOUT) Output High Voltage - (V) 3.5 (IOUT) Output Current - (mA) 4 25 20 3 15 2.5 10 VT = 4.75V 2 0 25 50 75 100 125 5 0 25 50 75 100 125 (TJ) Junction Temperature - (C) (TJ) Junction Temperature - (C) FIGURE 7. -- OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE 25 FIGURE 8. -- OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE 25 VT = 4.75V TA = 25C VT = 3.3V TA = 25C (IOUT) Output Current - (mA) 15 (IOUT) Output Current - (mA) 0.4 20 20 15 10 10 5 5 0 0 0.8 1.2 1.6 2 2.4 2.8 3.2 0 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 (VOUT) Output High Voltage - (V) (VOUT) Output High Voltage - (V) Copyright (c) 1997 Rev. 1.7 12/97 9 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5218 9-CHANNEL PLUG P AND UltraMAX P L AY S C S I T E R M I N A T O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 9. -- TERMPWR SUPPLY CURRENT vs. TERMINATION VOLTAGE 7 FIGURE 10. -- LX5218 TERMPWR SUPPLY CURRENT 400 vs. TERMINATION VOLTAGE (Disabled) (ICC) TermPwr Supply Current - (mA) 6 (ICC) TermPwr Supply Current - (A) 3.5 350 300 250 200 150 100 50 0 5 4 3 2 1 0 2.5 3 4 4.5 5 5.5 6 0 1 2 3 4 5 6 (VTERM) Termination Voltage - (V) (VTERM) Termination Voltage - (V) FIGURE 11. -- OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP. 4.5 FIGURE 12. -- OUTPUT CURRENT vs. JUNCTION TEMP. 30 VT = 3.3V VT = 3.3V (VOUT) Output High Voltage - (V) 4 (IOUT) Output Current - (mA) 25 3.5 20 3 15 2.5 10 2 0 25 50 75 100 125 5 0 25 50 75 100 125 (TJ) Junction Temperature - (C) (TJ) Junction Temperature - (C) 10 Copyright (c) 1997 Rev. 1.7 12/97 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX 9-CHANNEL PLUG P AND LX5218 P L AY S C S I T E R M I N AT O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 13. -- OUTPUT HIGH VOLTAGE vs. TERMINATION VOLTAGE 4 3.5 3 2.5 2 1.5 1 0.5 0 3 3.5 4 4.5 5 5.5 6 FIGURE 14. -- OUTPUT CURRENT vs. TERMINATION VOLTAGE 25 (VOUT) Output High Voltage - (V) (VOUT) Output High Voltage - (V) 20 15 10 5 0 3 3.5 4 4.5 5 5.5 6 (VTERM) Termination Voltage - (V) (VTERM) Termination Voltage - (V) Copyright (c) 1997 Rev. 1.7 12/97 11 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5218 9-CHANNEL PLUG P AND UltraMAX P L AY S C S I T E R M I N A T O R D ATA RODUCTION S HEET CHARACTERISTIC CURVES FIGURE 15. -- OUTPUT CURRENT CHANNEL TO CHANNEL MATCHING 24 23.5 23 Io (mA) 22.5 22 23.5 - 24 23 - 23.5 22.5 - 23 22 - 22.5 21.5 - 22 21 - 21.5 21.5 i6 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 i0 Part # 21 22 23 24 25 i2 i4 i8 Channel A P P L I C A T I O N S C H E M AT I C FIGURE 16 -- 8-BIT SCSI SYSTEM APPLICATION 5V 2.2F DISC1 DISC2 TERM POWER VTERM HOST PERIPHERAL TERM POWER VTERM 2.2F 5V LX5218 DB (0) DB (1) DB (6) DB (7) DB (P) ~~ DB (0) DB (1) DB (6) DB (7) DB (P) LX5218 DISC1 DISC2 TERMPWR VTERM TERMPWR ATN BSY ACK RST MSG ~~~ TERMPWR VTERM TERMPWR DISC1 DISC2 LX5218 SCSI CABLE ATN BSY ACK RST MSG ~~ LX5218 DISC1 DISC2 Note: Add third LX5218 for 16-bit SCSI TM ~~~ UltraMAX is a trademark of Linfinity Microelectronics Inc. PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document may not be modified in any way without the express written consent of Linfinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. 12 Copyright (c) 1997 Rev. 1.7 12/97 |
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