LIN D O C #: 5225 UltraMAX TM U LT R A 18-L I N E , P L U G T H E I N F I N I T E P O W E R O F I P N N O VA T I O N LX5225 AND R O D U C T I O N DESCRIPTION The LX5225 SCSI terminator is part of Linfinity's UltraMAX family of high-performance, adaptive, non-linear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in its 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. Each is approved for use with SCSI1, -2, -3, UltraSCSI and beyond — providing the highest performance alternative available today. The LX5225 architecture is much more tolerant of marginal system integrations. A key P L AY SCSI T E R M I N AT O R D A T A S H E E T K E Y F E AT U R E S improvement offered by the LX5225 lies in its ability to ensure 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. To enter the disconnect mode, the disconnect pins must be driven low thereby disconnecting the LX5225 from the SCSI bus. The LX5225 has two disconnect pins for SCSI Plug and Play (PnP) applications. Quiescent current is less than 150µA in this mode. Reduced component counts is also inherent in the LX5225 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20µF in value and size. The LX5225 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs. The LX5225 is a superior pin-for-pin replacement for the LX5205 and the UCC5607. ■ SCSI Plug And Play, Dual Low Disconnect, Logic Low Command Disconnects All Termination Lines ■ Ultra-Fast Response For Fast-20 SCSI Applications ■ 35MHz Channel Bandwidth ■ Sleep-Mode Current Less Than 150µA ■ NO External Compensation Capacitors ■ Compatible With Active Negation Drivers ■ Compatible With Passive And Active Terminations ■ Approved For Use With SCSI 1, 2, 3 And Ultra SCSI ■ Hot Swap Compatible ■ Pin-For-Pin Compatible With LX5205 And UC5607 NOTE: For current data & package dimensions, visit our 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 H Z D R I V I N G W AV E F O R M - 2 0 M H Z Receiver DISC 1 DISC 2 Driver 1 Meter, AWG 28 LX5225 PnP LX5268 LX5225 PnP LX5268 PA C K A G E O R D E R I N F O TA (°C) 0 to 70 SOWB DWP Plastic 28-pin, Power LX5225CDWP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5225CDWPT) Copyright © 1999 Rev. 1.0 5/99 DISC 1 DISC 2 NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus" LINFINITY MICROELECTRONICS INC. 11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 UltraMAX LX5225 U LT R A 18-L I N E , P L U G P AND R O D U C T I O N A B S O L U T E M A X I M U M R AT I N G S P L AY SCSI T E R M I N AT O R D A T A S H E E T PACKAGE PIN OUTS (Note 1) TermPwr Voltage ................................................................................................. +7V Signal Line Voltage ................................................................................... 0V to +7V Operating Junction Temperature Plastic (DWP Packages) ............................................................................... 150°C Storage Temperature Range .............................................................. -65°C to 150°C Lead Temperature (Soldering, 10 seconds) .................................................... 300°C DISC1 T1 T2 T3 T4 T5 HEAT SINK/GND GND HEAT SINK/GND T6 T7 T8 T9 VTERM Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. T H E R MAL DATA DWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, θJL 18°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 40°C/W 1 28 2 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 DISC2 T18 T17 T16 T15 T14 HEAT SINK/GND HEAT SINK/GND HEAT SINK/GND T13 T12 T11 T10 N.C. DWP PACKAGE (Top View) Junction Temperature Calculation: TJ = TA + (PD x θJA). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 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 Symbol Termpwr Voltage Signal Line Voltage Disconnect Input Voltage Operating Virtual Junction Temperature Range LX5225C (Note 2) Recommended Operating Conditions Min. Typ. Max. VTERM Units 4.0 0 0 5.5 5 VTERM V V V 0 125 °C Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. Parameter 2 Symbol Output High Voltage TermPwr Supply Current VOUT ICC Output Current Disconnect Input Current Output Leakage Current Channel Bandwidth Termination Sink Current, per Channel IOUT IIN IOL BW ISINK Test Conditions Min. 2.65 All data lines = open All data lines = 0.2V DISC1 and DISC2 Pins < 0.8V VOUT = 0.2V DISC1 and DISC2 Pins = 0V DISC1 and DISC2 Pins = < 0.8V, VO = 0.2V -20 LX5225 Typ. Max. 2.85 10 424 50 -22 35 VOUT = 4V 7 15 450 150 -24 -10 1 Units V mA mA µA mA µA µA MHz mA Copyright © 1999 Rev. 1.0 5/99 PRODUCT DATABOOK 1996/1997 UltraMAX LX5225 U LT R A 18-L I N E , P L U G P AND R O D U C T I O N P L AY SCSI T E R M I N AT O R D A T A S H E E T BLOCK DIAGRAM FIGURE 1 — LX5225 BLOCK DIAGRAM TERM POWER CURRENT BIASING CIRCUIT 24mA CURRENT LIMITING CIRCUIT DATA OUTPUT PIN DB(0) 2.85V DISC1 DISC2 1.4V 1 OF 18 CHANNELS A P P L I C AT I O N S C H E M AT I C FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION TERM POWER LX5225 VTERM DB (0) DB (1) DB (0) DB (1) ACK RST MSG ACK RST MSG LX5225 5V 4.7µF PnP DISCONNECT VTERM ~ ~ 4.7µF PERIPHERAL ~ ~ ~ PnP DISCONNECT HOST TERM POWER 5V SCSI CABLE Copyright © 1999 Rev. 1.0 5/99 3 PRODUCT DATABOOK 1996/1997 UltraMAX LX5225 U LT R A 18-L I N E , P L U G P AND R O D U C T I O N P L AY SCSI T E R M I N AT O R D A T A S H E E T FUNCTIONAL DESCRIPTION To enable the device a DISC1 and DISC2 pins must be pulled Cable transmission theory suggests to optimize signal speed Logic High. During this mode of operation, quiescent current and quality, the termination should act both as an ideal voltage is 10mA and the device will respond to line demands by reference when the line is released (deasserted) and as an delivering 24mA on assertion and by imposing 2.85V on ideal current source when the line is active (asserted). Common deassertion. In order to active terminators, which POWER UP / POWER DOWN FUNCTION TABLE disable the device, the consist of Linear RegulaDISC1 and DISC2 pins tors in series with resisQuiescent DISC 1 DISC 2 Outputs must be driven logic Low. tors (typically 110Ω), are Current This mode of operation a compromise. As the H H Disabled 15mA places the device in a sleep line voltage increases, state where a meager the amount of current deH L Enabled 15mA 150µA of quiescent current creases linearly by the L H Enabled 15mA is consumed. Additionally, equation V = I * R. The L L Disabled 150µA all outputs are in a Hi-Z LX5225, with its unique (impedance) state. Sleep new architecture applies Open Open Disabled 150µA mode can be used for the maximum amount of power conservation or to completely eliminate the terminator current regardless of line voltage until the termination high from the SCSI chain. threshold (2.85V) is reached. An additional feature of the LX5225 is its compatibility with Acting as a near ideal line terminator, the LX5225 closely active negation drivers. reproduces the optimum case when the device is enabled. 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. 4 Copyright © 1999 Rev. 1.0 5/99