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參數(shù)資料
| 型號(hào)： | LX5219CPWT |
| 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 110 ohm SCSI BUS TERMINATOR, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大小： | 245K |
| 代理商： | LX5219CPWT |
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
LX5219
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1998
Rev. 1.8 3/98
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 resistors (typically
110
), are a compromise. As the
line voltage increases, the amount
of current decreases linearly by the
equation V = I * R. The LX5219,
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 terminator, the LX5219 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 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 Disable pin
must be driven logic
Low
. This mode of operation places
the device in a sleep state where a meager 275μA 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 termi-
nator from the SCSI chain. In the
second case, termination node ca-
pacitance 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
LX5219 has been optimized to have only 3pF of capacitance
per output in the sleep state.
An additional feature of the LX5219 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.
Disable
(LX5219)
Outputs
Quiescent
Current
H
L
Enabled
HI Z
Enabled
6mA
275μA
6mA
Open
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX5225 | ULTRA 18-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5225CDWP | ULTRA 18-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5225CDWPT | Terminator |
| LX5226 | ULTRA 1 8 - LINE SCSI TERMINATOR |
| LX5226CDWP | ULTRA 1 8 - LINE SCSI TERMINATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX5225 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 18-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5225CDWP | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 18-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5225CDWPT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5226 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 1 8 - LINE SCSI TERMINATOR |
| LX5226CDWP | 制造商:Linfinity Microelectronics Inc 功能描述:TERMINATOR, 28 Pin, Plastic, SOP |
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