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LX5208 Dataheets PDF



Part Number LX5208
Manufacturers Microsemi Corporation
Logo Microsemi Corporation
Description 18-LINE LOW CAPACITANCE/ POWER SCSI TERMINATOR
Datasheet LX5208 DatasheetLX5208 Datasheet (PDF)

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 N N O VA T I O N P R O D U C T I O N D A T A S H E E T 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 mo.

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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 N N O VA T I O N P R O D U C T I O N D A T A S H E E T 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 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. K E Y F E AT U R E S s 3.5pF OUTPUT CAPACITANCE DURING DISCONNECT s 60µA SUPPLY CURRENT IN DISCONNECT MODE s 800µA SUPPLY CURRENT DURING NORMAL OPERATION s 200mA SINK CURRENT FOR ACTIVE NEGATION s LOGIC COMMAND DISCONNECTS ALL TERMINATION LINES s CURRENT LIMIT AND THERMAL PROTECTION s COMPATIBLE WITH SCSI 1, 2 AND 3 STANDARDS s 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 Receiver 1 Meter, AWG 28 LX5208 LX5268 Driver LX5208 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 LX5208CDWP 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. 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 D A T A S H E E T A B S O L U T E M A X I M U M R AT I N G S (Note 1) PACKAGE PIN OUTS DISCONNECT T1 T2 T3 T4 T5 HEAT SINK HEAT SINK HEAT SINK T6 T7 T8 T9 VTERM 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 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 THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 18°C/W 40°C/W 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 Disconnect L H Open Outputs Enabled HI Z HI Z Quiescent Current 800µA 60µA 60µA 2 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 TermPwr Voltage Signal Line Voltage Disconnect Input Voltage Output Capacitance on REGOUT Operating Virtual Junction Temperature Range LX5208C Note 2. Range over which t.


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