LIN D O C #: 5208 LX5208 18-L INE LOW CAPACITANCE, µPOWER SCSI TERMINATOR 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 R O D U C T I O N DESCRIPTION The LX5208 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 LX5208 requires a meager 60µA of supply current while offering only 3.5pF of output capacitance. To enter this low-power mode, the disconnect pin can be left open (floating) or driven high, 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 yield subsequent reliable, error free communications. During normal operation, the LX5208 consumes only 800µA of current, which is the D A T A S H E E T K E Y F E AT U R E S 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 LX5208 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 the LX5208 sinks up to 200mA of current making it compatible with today's fast active negation drivers. The LX5208 is a superior, pin-for-pin replacement for a variety of industry products such as the UC5601, UC5602, UC5608, and UC5609. ■ 3.5pF OUTPUT CAPACITANCE DURING DISCONNECT ■ 60µA SUPPLY CURRENT IN DISCONNECT MODE ■ 800µA SUPPLY CURRENT DURING NORMAL OPERATION ■ 200mA SINK CURRENT FOR ACTIVE NEGATION ■ LOGIC COMMAND DISCONNECTS ALL TERMINATION LINES ■ CURRENT LIMIT AND THERMAL PROTECTION ■ COMPATIBLE WITH SCSI 1, 2 AND 3 STANDARDS ■ CONSULT FACTORY FOR APPLICATION TEST REPORT: 5208TR PRODUCT HIGHLIGHT R E C E I V I N G W AV E F O R M - 10MH Z D R I V I N G W AV E F O R M - 10MH Z Driver Receiver 1 Meter, AWG 28 LX5208 LX5208 LX5268 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 NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus" LX5208CDWP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5208CDWPT) F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1 Copyright © 1998 Rev. 1.9 3/98 11861 W ESTERN A VENUE , G ARDEN G ROVE, CA. 92841 1 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5208 18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR P 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 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 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 DISCONNECT T1 T2 T3 T4 T5 HEAT SINK HEAT SINK HEAT SINK T6 T7 T8 T9 VTERM 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 GND T18 T17 T16 T15 T14 HEAT SINK HEAT SINK HEAT SINK 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 Outputs Quiescent Current L H Open Enabled HI Z HI Z 800µA 60µA 60µA Copyright © 1998 Rev. 1.9 3/98 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5208 18-L INE LOW CAPACITANCE, µPOWER SCSI TERMINATOR P R O D U C T I O N D 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 LX5208C (Note 2) Recommended Operating Conditions Min. Typ. Max. VTERM Units 4 0 0 4.7 5.25 5 VTERM V V V µF 0 70 °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 ≤ T A ≤ 70°C. TermPwr = 4.75V, Disconnect = 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Symbol Test Conditions Min. LX5208 Typ. Max. Units Supply Current Section TermPwr Supply Current Power Down Mode All term lines = Open All term lines = 0.5V Disconnect = Open 0.8 390 60 1.5 430 100 mA mA µA 110 2.9 -21.8 -21.8 -21.8 -21.8 10 3.5 70 120 -23 -23 -23 -23 400 Ω V mA mA mA mA nA pF mA 3.6 10 20 0.45 -700 150 20 50 1.0 -1000 V mV mV V mA °C 2.0 40 V µA 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 ≤ TA ≤ 70°C VOUT = 0.5V, V TERM = 4V, TA = 25°C VOUT = 0.5V, V TERM = 4V, 0°C ≤ TA ≤ 70°C Disconnect = Open, VTERM = 0V to 5.25V Disconnect = 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 VTERM = 4V to 6V I REG = 0 to -100mA IREG = -100mA VREG = 0V Disconnect Section Disconnect Threshold Input Current Copyright © 1998 Rev. 1.9 3/98 0.8 Disconnect = 0V 3 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 LX5208 18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR P R O D U C T I O N D A T A S H E E T BLOCK DIAGRAM FIGURE 1 — LX5208 BLOCK DIAGRAM REG OUT VTERM VTERM Channel 1 of 18 DISCONNECT VBG T0 VTERM T17 A P P L I C AT I O N S C H E M AT I C FIGURE 2 — 8/16-BIT SCSI SYSTEM APPLICATION Narrow TERM POWER VTERM DB (0) DB (1) DB (0) DB (1) TERMPWR DB (14) DB (15) DB (P1) Wide Wide ~ ~ MSG RST ~ ~ ~ VTERM DISCONNECT DB (14) DB (15) DB (P1) ACK BSY ATN REGOUT 4.7µF TERMPWR VTERM SCSI CABLE MSG RST LX5213 2.2µF REGOUT DISCONNECT 4.7µF 4.7µF LX5208 LX5208 REGOUT 5V DISCONNECT PERIPHERAL VTERM ~ ~ 4.7µF HOST ~ ~ ~ DISCONNECT Narrow TERM POWER 5V LX5213 ACK BSY ATN REGOUT 2.2µF PRODUCTION DATA - Information contained in this document is proprietary to Lin Finity, 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 © 1998 Rev. 1.9 3/98