LIN D O C #: 5205 LX5205 18-L INE P LUG T H E I N F I N I T E P O W E R O F I N N O VA T I O N P AND P LAY , µP OWER SCSI T ERMINATOR R E L I M I N A R Y DESCRIPTION The LX5205 is an eighteen line active terminator for the SCSI parallel bus. This SCSI standard recommends active termination at both ends of the SCSI bus. During disconnect mode, the LX5205 requires a meager 500nA of supply current while offering only 2.5pF of output capacitance. To enter this low power mode, the disconnect pins can be left open (floating) or driven low thereby disconnecting the terminating resistors and placing the internal low dropout regulator into low power mode. In disconnect mode each termination line presents a high impedance to the SCSI bus with the overall effect being to preserve high signal integrity and subsequent reliable, error free communications. The LX5205 has two disconnect pins for SCSI Plug and Play (PnP) applications. D A T A S H E E T K E Y F E AT U R E S During normal operation, the LX5205 consumes only 800µA of current which is the lowest enabled supply current of any terminator available on the market today. Linfinity's proprietary BiCMOS low dropout regulator architecture enables this unique and very efficient operating characteristic. The LX5205 also offers a precisely trimmed channel output current specified to a 5% tolerance. The maximum value of the output current is trimmed as closely as possible to the SCSI standard maximum specification to give the highest possible noise margin for fast SCSI operation. And finally, the LX5205 sinks up to 100mA of current making it compatible with today's fast active negation drivers. The LX5205 is a superior, pin-for-pin replacement for the UC5607. ■ SCSI PLUG AND PLAY, DUAL LOW DISCONNECT, LOGIC LOW COMMAND DISCONNECTS ALL TERMINATION LINES ■ 2.5pF OUTPUT CAPACITANCE DURING DISCONNECT ■ 500nA SUPPLY CURRENT IN DISCONNECT MODE ■ 800µA SUPPLY CURRENT DURING NORMAL OPERATION ■ 100mA SINK CURRENT FOR ACTIVE NEGATION ■ LOGIC COMMAND DISCONNECTS ALL TERMINATION LINES ■ CURRENT LIMIT AND THERMAL PROTECTION ■ COMPATIBLE WITH SCSI 1, 2, 3, AND FAST-20 STANDARDS ■ HOT SWAP COMPATIBLE 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 - 20MH Z D R I V I N G W AV E F O R M - 20MH Z Driver Receiver Disconnect 1 Disconnect 2 LX5205 PnP 1 Meter, AWG 28 LX5268 LX5205 PnP 0 to 70 SOWB DWP Plastic 28-pin, Power LX5205CDWP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5205CDWPT) Copyright © 1998 Rev. 0.7 3/98 Disconnect 2 LX5268 PA C K A G E O R D E R I N F O TA (°C) Disconnect 1 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 LX5205 18-L INE P LUG P AND P LAY , µP OWER SCSI TERMINATOR R E L I M I N A R Y A B S O L U T E M A X I M U M R AT I N G S D A T A S H E E T PACKAGE PIN OUTS (Note 1) TermPwr Voltage ................................................................................................. +7V Signal Line Voltage ................................................................................... 0V to +7V Regulator Output Current ................................................................................... 1.2A Operating Junction Temperature Plastic (DWP Package) ................................................................................. 150°C Storage Temperature Range .............................................................. -65°C to 150°C Lead Temperature (Soldering, 10 seconds) .................................................... 300°C DISCONNECT 1 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 M A L D ATA 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 DISCONNECT 2 T18 T17 T16 T15 T14 HEAT SINK/GND HEAT SINK/GND HEAT SINK/GND T13 T12 T11 T10 REG OUT 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. POWER UP / POWER DOWN FUNCTION T ABLE 2 Disconnect 1 Disconnect 2 Outputs Quiescent Current H H L L Open H L H L Open Disabled Enabled Enabled Disabled Disabled 0.5µA 800µA 800µA 80µA 0.5µA Copyright © 1998 Rev. 0.7 3/98 PRODUCT DATABOOK 1996/1997 LX5205 18-L INE P LUG P AND P LAY , µP OWER SCSI T ERMINATOR D R E L I M I N A R Y A T A S H E E T 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 Output Capacitance on REGOUT Operating Virtual Junction Temperature Range LX5205C (Note 2) Recommended Operating Conditions Min. Typ. Max. VTERM Units 4 0 0 4.7 5.25 5 VTERM V V V µF 0 125 °C Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ TA ≤ 70°C. Termpwr = 4.75V, DISCONNECT 1 = DISCONNECT 2 = 2.2V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Symbol Test Conditions Min. LX5205 Typ. Max. Units Supply Current Section Termpwr Supply Current Power Down Mode All term lines Open All term lines 0.5V DISCONNECT 1,2 = Open 0.8 390 0.5 1.5 415 1 mA mA µA 110 2.9 -21.8 -21.8 -21.8 -21.8 10 2.5 70 120 -23 -23 -23 -23 400 Ω V mA mA mA mA nA pF mA 20 50 1.0 -1000 V mV mV V mA °C Output Section (Terminator Lines) Terminator Impedance Terminator Output High Voltage Max. Output Current Output Leakage Output Capacitance Sink Current ITERM = -5mA to -15mA VOUT = 0.5V, T A = 25°C VOUT = 0.5V, 0°C ≤ T A ≤ 70°C VOUT = 0.5V, VTERM = 4V, TA = 25°C VOUT = 0.5V, VTERM = 4V DISCONNECT 1,2 = Open, VTERM = 0V to 5.25V DISCONNECT 1,2 = Open VOUT = 4V 100 2.7 -20.3 -19.0 -19.5 -18.0 58 Regulator Section Regulator Output Voltage Line Regulation Load Regulation Drop Out Voltage Short Circuit Current Thermal Shutdown 3.6 10 20 0.45 -700 150 VTERM = 4V to 6V I REG = 0 to -100mA I REG = -100mA VREG = 0V Disconnect Section Disconnect Threshold Input Current Copyright © 1998 Rev. 0.7 3/98 0.8 Disconnect 1 = Disconnect 2 = 0V Disconnect 1 = Disconnect 2 = 2.2V 2.0 -28 -25 V µA µA 3 PRODUCT DATABOOK 1996/1997 LX5205 18-L INE P LUG P AND P LAY , µP OWER SCSI TERMINATOR R E L I M I N A R Y D A T A S H E E T BLOCK DIAGRAM FIGURE 1 — LX5205 BLOCK DIAGRAM REG OUT VTERM VTERM DISCONNECT 1 Channel 1 of 18 DISCONNECT 2 VBG T0 VTERM T17 A P P L I C A T I O N S C H E M AT I C FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION Narrow REGOUT TERM POWER VTERM DB (0) DB (1) DB (0) DB (1) ACK RST MSG ACK RST MSG LX5205 REGOUT 5V 4.7µF PnP DISCONNECT LX5205 4.7µF PERIPHERAL VTERM ~ ~ 4.7µF HOST ~ ~ ~ 5V PnP DISCONNECT Narrow TERM POWER 4.7µF SCSI CABLE PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only, and Linfinity reserves the right to change or discontinue this proposed product at any time. 4 Copyright © 1998 Rev. 0.7 3/98