LX5226CDWP Ver la hoja de datos (PDF) - Microsemi Corporation

Número de pieza

componentes Descripción

Lista de partido

LX5226CDWP

ULTRA 1 8 - LINE SCSI TERMINATOR

Microsemi Corporation 

LX5226

PRODUCT DATABOOK 1996/1997

ULTRA 18-L INE SCSI TERMINATOR

PRODUCTION DATA SHEET

UltraMAX

FUNCTIONAL DESCRIPTION

Cable transmission theory suggests that in order to optimize

signal speed and quality, the termination should act both as

an ideal voltage reference when the line is released (deasserted)

and as an ideal current source when the line is active (asserted).

Common active terminators, which consist of Linear Regulators

in series with resistors (typically 110Ω), are a compromise.

As the line voltage increases, the amount of current decreases

linearly by the equation V = I * R. The LX5226, with its unique

new architecture, applies the maximum amount of current

regardless of line voltage until the termination high threshold

(2.85V) is reached.

Acting as a near ideal line terminator, the LX5226 closely

reproduces the optimum case when the device is enabled.

To enable the device a DISC pin must be pulled Logic Low.

During this mode of operation, quiescent current is 6mA and

the device will respond to line demands by delivering 24mA

on assertion and by imposing 2.85V on deassertion. In order

to disable the device, the DISC pin must be driven logic High.

This mode of operation places the device in a sleep state where

a meager 150µA of quiescent current is consumed. Additionally,

all outputs are in a Hi-Z (impedance) state. Sleep mode can

be used for power conservation or to completely eliminate the

terminator from the SCSI chain.

An additional feature of the LX5226 is its compatibility with

active negation drivers.

POWER UP / POWER DOWN FUNCTION TABLE

DISC Pin

Outputs

Quiescent

Current

L

H

Open

Enabled

HI Z

HI Z

15mA

150µA

150µA

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

Share Link: