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參數(shù)資料
| 型號(hào)： | LX5115ACDWT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Terminator |
| 中文描述： | 9-LINE SCSI BUS TERMINATOR, PDSO16 |
| 封裝： | PLASTIC, SO-16 |
| 文件頁(yè)數(shù)： | 4/4頁(yè) |
| 文件大?。?/td> | 150K |
| 代理商： | LX5115ACDWT |
ULTRA 9-C
H A N N E L
SCSI T
E R M I N A T O R
LX5115A
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 2000
Rev. 1.0 4/00
4
P
R O D U C T I O N
D
A T A
S
H E E T
UltraMAX
B L O C K D I A G R A M
F U N C T I O N A L D E S C R I P T I O N
TERM POWER
CURRENT
BIASING
CIRCUIT
2.0V
DISABLE
PIN
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
1 OF 9 CHANNELS
Cable transmission theory suggests 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 resis-
tors (typically 110
), are a compro-
mise. As the line voltage increases,
the amount of current decreases lin-
early by the equation V = I * R. The
LX5115A, with its unique new archi-
tecture 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 LX5115A closely
reproduces the optimum case when the device is enabled.
To enable the device the Disable Pin must be pulled Logic
High or left open. During this mode of operation, quiescent
current is 5.5mA 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 Disable pin
must be driven logic
Low
. This mode of operation places
the device in a sleep state where a meager 200μA 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. In the second case, termination
node capacitance is important to
consider. The terminator will appear
as a parasitic distributed capacitance
on the line, which can detract from bus
performance. For this reason, the
LX5115A has been optimized to have only 3pF of capacitance
per output in the sleep state.
An additional feature of the LX5115A is its compatibility with
active negation drivers. The device handles up to 7mA of sink
current for drivers which exceed the 2.85V output high.
Disable
LX5115A
H
L
Open
Outputs
Quiescent
Current
5.5mA
200μA
5.5mA
Enabled
HI Z
Enabled
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX5115A | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5115ACD | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5115ACDW | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5115ACPWP | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5115ACPWPT | Terminator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX5115ACPWP | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5115ACPWPT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5115CD | 制造商:LINFINITY 功能描述: |
| LX5115CDT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5115CDW | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
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