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LX5255 Datasheet(PDF) 4 Page - Microsemi Corporation |
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LX5255 Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 7 page Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 Copyright 2000 Rev. 1.0a, 2003-06-30 LX5255 9-Line LVD SCSI Terminator PRODUCTION DATA SHEET I N T E GRA T ED PR ODUC T S FUNCTIONAL PIN DESCRIPTION PIN NAME DESCRIPTION 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9- Negative signal termination lines for LVD mode. 1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+ Positive signal termination lines for LVD mode. VTERM Power supply pin for terminator. Connect to SCSI bus VTERM. Must be decoupled by one 4.7µF low-ESR capacitor for every three terminator devices. It is absolutely necessary to connect this pin to the decoupling capacitor through a very low impedance (big traces to PCB). Keeping distances very short from the decoupling capacitors is somewhat layout dependent and some applications may benefit from high frequency decoupling with 0.1µF capacitors at VTERM pin. DISC Enables/Disables terminator. See Power Down Function Table for logic levels. GND Terminator ground pin. Connect to ground. DIFSENS Differential sense pin connected to system DIFFSENS line. Drives the SCSI bus DIFSENS line to 1.3V. DIFFB Used to detect the SCSI bus mode (SE, LVD or HVD). Should be connected to a 4.7uF capacitor to GND, and a 50KΩ resistor to the DIFFSENS pin (see Figure 2 on page 5). 5 BLOCK DIAGRAM DIFSENS DISC DIFFB LATCH Window Comp. + - POWER ON & MODE DELAY LVD SE HVD 150 1.07 mA 1.07 mA 52.5 52.5 VTERM LVD GND LVD(-) LVD(+) 1 of 9 Lines 10mA I-Limited 1.3V Source HVD SE LVD HVD SE 24 13 11 10 12 3 2 DISC 1.25V DISC Figure 1 – LX5255CPW Block Diagram |
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