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參數(shù)資料
| 型號： | LX5218CDW |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 9-CHANNEL PLUG AND PLAY SCS I TERMINATOR |
| 中文描述： | 9-LINE 110 ohm SCSI BUS TERMINATOR, PDSO16 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SO-16 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 247K |
| 代理商： | LX5218CDW |
9-C
HANNEL
P
LUG
AND
P
LAY
SCSI T
ERMINATOR
LX5218
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. 1.7 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
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
1 OF 9 CHANNELS
DISC1
DISC2
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 resistors (typically
110
), are a compromise. As the
line voltage increases, the amount
of current decreases linearly by the
equation V = I * R. The LX5218,
with its unique new architecture
applies the maximum amount of
current regardless of line voltage
until the termination high thresh-
old (2.85V) is reached.
Acting as a near ideal line ter-
minator, the LX5218 closely reproduces the optimum case
when the device is enabled. To enable the device the DISC1
and DISC2 Pins must be pulled logic
High, Open,
or any
combination of both
High
and
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 DISC1 and DISC2 pins must be driven logic
Low
.
This mode of operation places the device in a sleep state where
a meager 275μA of quiescent cur-
rent is consumed. Additionally, all
outputs are in a Hi-Z (impedance)
state. Sleep mode can be used for
power conservation or to com-
pletely eliminate the terminator
from the SCSI chain. In the second
case, termination node capacitance
is important to consider. The ter-
minator will appear as a parasitic
distributed capacitance on the line,
which can detract from bus per-
formance. For this reason, the
LX5218 has been optimized to have only 3pF of capacitance
per output in the sleep state.
An additional feature of the LX5218 is its compatibility with
active negation drivers. The device handles up to 60mA of
sink current for drivers which exceed the 2.85V output high.
Outputs
Quiescent
Current
H
H
L
L
H
L
H
L
Enabled
Enabled
Enabled
Disabled
Enabled
6mA
6mA
6mA
275μA
6mA
Open
Open
DISC1
DISC2
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX5218CPW | 9-CHANNEL PLUG AND PLAY SCS I TERMINATOR |
| LX5218CDWT | Terminator |
| LX5218CPWT | Terminator |
| LX5219 | ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5219CDW | ULTRA 9 - CHANNEL SCSI TERMINATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX5218CDWT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5218CPW | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:9-CHANNEL PLUG AND PLAY SCS I TERMINATOR |
| LX5218CPWT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5219 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5219CDW | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
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