- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376113 > LX5121 (Microsemi Corporation) ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR PDF資料下載
參數(shù)資料
| 型號： | LX5121 |
| 廠商： | Microsemi Corporation |
| 英文描述： | ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| 中文描述： | 超27線，即插即用的SCSI終結(jié)者 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 145K |
| 代理商： | LX5121 |
ULTRA 27-L
INE
, P
LUG
AND
P
LAY
SCSI T
ERMINATOR
LX5121
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
3
Copyright 1999
Rev. 1.0 5/99
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
1.4V
DISC2
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
1 OF 27 CHANNELS
DISC1
V
CC
V
CC
Cable transmission
theory suggests that in
order to optimize sig-
nal speed and quality,
the
termination
should act both as an
ideal voltage refer-
ence when the line is
released (de-asserted)
and as an ideal current
source when the line
is active (asserted).
Common active termi-
nators, 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 UltraMAX LX5121, 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 LX5121 closely
reproduces the opti-
mum case when the
device is enabled. To
enable the device the
DISC1 and DISC2 pins
must be driven per the
above table. During
this mode of operation,
quiescent current is
12mA and the device
will respond to line de-
mands by delivering
24mA on assertion and
by imposing 2.85V on
de-assertion. Disable
mode places the device
in a sleep state, where
a meager 150μA of qui-
escent 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 LX5121 is its compatibility with
active negation drivers.
DISC1
DISC2
W1
W2
N1
T1-T18
T19-T27
H
L
L
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
DC
DC
DC
H
H
H
H
L
L
L
L
DC
DC
DC
H
H
L
L
H
H
L
L
DC
DC
DC
H
L
H
L
H
L
H
L
Enabled
Disabled
Disabled
Enabled
Enabled
Enabled
Disabled
Enabled
Disabled
Disabled
Disabled
Disabled
Enabled
Disabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Disabled
Disabled
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX5121CDB | ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5121CDBT | Terminator |
| LX5122 | ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5122CDB | ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5122CDBT | Terminator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX5121CDB | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5121CDBT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
| LX5122 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5122CDB | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR |
| LX5122CDBT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Terminator |
發(fā)布緊急采購，3分鐘左右您將得到回復。