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LX5247CPW

9 - LINE LVD SCSI TERMINATOR

Microsemi Corporation 

UltraMAX

PRODUCT DATABOOK 1996/1997

LX5245/5246/5247

9-LINE LVD SCSI TERMINATOR

PRELIMINARY DATA SHEET

FUNCTIONAL PIN DESCRIPTION

Pin

Designator

Description

1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-1 Negative signal termination lines.

1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+ Positive signal termination lines.

VTERM

DISC1

Power supply pin for terminator. Connect to SCSI bus TERMPWR. 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 on PCB). Keeping distances very

short from the decoupling capacitors to the VTERM pin is also critical. The value of the decoupling

capacitor is somewhat layout dependant and some applications may benefit from high-frequency

decoupling with 0.1µF capacitors right at VTERM pin.

Enables / disables terminator. See Power Down Function Table for logic levels per device.

GND1

Terminator ground pin. Connect to ground.

DIFFSENSE1

Used to drive DIFFSENS output 3V @ 10 mt. Usually connected through a 20kOhm resistor to DIFF B

pin.

DIFFB1

Used to detect the SCSI BUS mode (LUD, HUD, SE)

Copyright © 2000

Rev. 0.6 10/00

5

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