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參數(shù)資料
| 型號： | LX5115CPWP |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 通用總線功能 |
| 英文描述： | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| 中文描述： | 9-LINE 110 ohm SCSI BUS TERMINATOR, PDSO20 |
| 封裝： | POWER, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 145K |
| 代理商： | LX5115CPWP |
U LT R A 9 - C
H A N N E L
S C S I T
E R M I N A T O R
LX5115
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1997
Rev. 1.1 12/97
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
THERMAL
LIMITING
CIRCUIT
TERM POWER
CURRENT
BIASING
CIRCUIT
1.4V
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
LX5115, with its unique new architec-
ture 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 LX5115 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 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. 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
LX5115 has been optimized to have only 3pF of capacitance
per output in the sleep state.
An additional feature of the LX5115 is its compatibility with
active negation drivers. The device handles up to 37mA of
sink current for drivers which exceed the 2.85V output high.
Disable
LX5115
Outputs
Quiescent
Current
H
L
Enabled
HI Z
Enabled
5.5mA
150μA
5.5mA
Open
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
UltraMAX is a trademark of Linfinity Microelectronics Inc.
相關PDF資料 |
PDF描述 |
|---|---|
| LX5115 | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5115CDT | Terminator |
| LX5115CDWT | Terminator |
| LX5115CPWPT | Terminator |
| LX5240CDB | MULTIMODE, PLUG AND PLAY SCSI TERMINATOR |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX5115CPWPT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5119CDB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Terminator |
| LX5119CDBT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Terminator |
| LX5120CDB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Terminator |
| LX5120CDBT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Terminator |
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