LX5255CPW(2003) Ver la hoja de datos (PDF) - Microsemi Corporation
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LX5255CPW Datasheet PDF : 7 Pages
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INTEGRATED PRODUCTS
LX5255
9-Line LVD SCSI Terminator
PRODUCTION DATA SHEET
BLOCK DIAGRAM
VTERM 24
DISC 13 DISC
150
1.25V
10mA
I-Limited
1.3V
Source
DIFSENS 11
DIFFB 10
- SE
Window HVD
Comp.
+
LVD
1.07 mA
52.5
52.5
1.07 mA
HVD
LVD
SE
HVD
LVD
SE
DISC
LATCH
POWER
ON
&
MODE
DELAY
Figure 1 – LX5255CPW Block Diagram
1 of 9
Lines
3 LVD(-)
2 LVD(+)
12 GND
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
DISC
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.
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
Copyright 2000
Rev. 1.0a, 2003-06-30
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
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