'ACTIVE TERMINATION' related articles 1

  1. 2006/10/18 TL-SCSI285 - FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION
ㅁ Fully Matches Parameters for SCSI Alternative 2 Active Termination
ㅁ Fixed 2.85-V Output ±1% Maximum Output Tolerance at TJ = 25°C
ㅁ 0.7-V Maximum Dropout Voltage
ㅁ 620-mA Output Current
ㅁ ±2% Absolute Output Variation
ㅁ Internal Overcurrent-Limiting Circuitry
ㅁ Internal Thermal-Overload Protection
ㅁ 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-W and the 330-W resistors required for each transmission line with a passive termination scheme, reducing significantly the continuous system power drain. When placed in series with 110-W 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.

TL-SCSI285KC TL-SCSI285PWR TL-SCSI285Y

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