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TL-SCSI285PWRE4 Arkusz danych(PDF) 1 Page - Texas Instruments |
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TL-SCSI285PWRE4 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 12 page TL-SCSI285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS065F – NOVEMBER 1991 – REVISED JULY 1999 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Fully Matches Parameters for SCSI Alternative 2 Active Termination D Fixed 2.85-V Output D ±1% Maximum Output Tolerance at TJ = 25°C D 0.7-V Maximum Dropout Voltage D 620-mA Output Current D ±2% Absolute Output Variation D Internal Overcurrent-Limiting Circuitry D Internal Thermal-Overload Protection D Internal Overvoltage Protection description The TL-SCSI285 is a low-dropout (0.7-V) fixed-voltage regulator specifically designed for small computer systems interface (SCSI) alternative 2 active signal termination. The TL-SCSI285 0.7-V maximum dropout ensures compatibility with existing SCSI systems, while providing a wide TERMPWR voltage range. At the same time, the ±1% initial tolerance on its 2.85-V output voltage ensures a tighter line-driver current tolerance, thereby increasing the system noise margin. The fixed 2.85-V output voltage of the TL-SCSI285 supports the SCSI alternative 2 termination standard, while reducing system power consumption. The 0.7-V maximum dropout voltage brings increased TERMPWR isolation, making the device ideal for battery-powered systems. The TL-SCSI285, with internal current limiting, overvoltage protection, ESD protection, and thermal protection, offers designers enhanced system protection and reliability. When configured as a SCSI active terminator, the TL-SCSI285 low-dropout regulator eliminates the 220- Ω and the 330- Ω resistors required for each transmission line with a passive termination scheme, reducing significantly the continuous system power drain. When placed in series with 110- Ω resistors, the device matches the impedance level of the transmission cable and eliminates reflections. The TL-SCSI285 is characterized for operation over the virtual junction temperature range of 0 °C to 125°C. AVAILABLE OPTIONS PACKAGED DEVICES CHIP TJ PLASTIC POWER (KC) SURFACE MOUNT (PW) CHIP FORM (Y) 0 °C to 125°C TL-SCSI285KC TL-SCSI285PWR TL-SCSI285Y The PW package is only available taped and reeled. Chip forms are tested at 25 °C. Copyright © 1999, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 GND INPUT GND OUTPUT PW PACKAGE (TOP VIEW) HEAT SINK HEAT SINK HEAT SINK HEAT SINK KC PACKAGE (TOP VIEW) OUTPUT GND INPUT HEAT SINK – These terminals have an internal resistive connection to ground and should be grounded or electrically isolated. The GND terminal is in electrical contact with the mounting base. |
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