LX5225CDWP Ver la hoja de datos (PDF) - Microsemi Corporation
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LX5225CDWP Datasheet PDF : 4 Pages
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LX5225
PRODUCT DATABOOK 1996/1997
ULTRA 18-LINE, PLUG AND PL AY SCSI TERMINATOR
PRODUCTION DATA SHEET
UltraMAX
FUNCTIONAL DESCRIPTION
Cable transmission theory suggests to optimize signal speed To enable the device a DISC1 and DISC2 pins must be pulled
and quality, the termination should act both as an ideal voltage Logic High. During this mode of operation, quiescent current
reference when the line is released (deasserted) and as an is 10mA and the device will respond to line demands by
ideal current source when the line is active (asserted). Common delivering 24mA on assertion and by imposing 2.85V on
active terminators, which
consist of Linear Regula-
POWER UP / POWER DOWN FUNCTION TABLE
deassertion. In order to
disable the device, the
tors in series with resis-
tors (typically 110Ω), are
a compromise. As the
line voltage increases,
DISC 1
H
DISC 2
H
Outputs
Disabled
Quiescent
Current
15mA
DISC1 and DISC2 pins
must be driven logic Low.
This mode of operation
places the device in a sleep
the amount of current de-
H
creases linearly by the
equation V = I * R. The
LX5225, with its unique
L
L
L
Enabled
15mA
state where a meager
H
Enabled
15mA
150µA of quiescent current
is consumed. Additionally,
L
Disabled
150µA
all outputs are in a Hi-Z
new architecture applies
Open
Open
Disabled
150µA
(impedance) state. Sleep
the maximum amount of
mode can be used for
current regardless of line voltage until the termination high power conservation or to completely eliminate the terminator
threshold (2.85V) is reached.
from the SCSI chain.
Acting as a near ideal line terminator, the LX5225 closely
An additional feature of the LX5225 is its compatibility with
reproduces the optimum case when the device is enabled. active negation drivers.
UltraMAX is a trademark of Linfinity Microelectronics Inc.
PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of Linfinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
4
Copyright © 1999
Rev. 1.0 5/99
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