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參數(shù)資料
| 型號(hào)： | LX5119CDBT |
| 英文描述： | Terminator |
| 中文描述： | 終結(jié)者 |
| 文件頁數(shù)： | 3/3頁 |
| 文件大?。?/td> | 140K |
| 代理商： | LX5119CDBT |
ULTRA 27-L
INE
, P
LUG
AND
P
LAY
SCSI T
ERMINATOR
LX5119
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 2000
Rev. 1.0 4/00
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
DIS
24mA CURRENT
LIMITING CIRCUIT
DATA OUTPUT
PIN DB(0)
2.85V
1 OF 27 CHANNELS
Cable transmission theory suggests that in order to optimize
signal speed and quality, the termination should act both as
an ideal voltage reference when the line is released (de-asserted)
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
UltraMAX LX5119, 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 LX5119 closely
Disable
LX5119
L
H
Open
Outputs
Quiescent
Current
150μA
(Max.)
20mA
(Max.)
20mA
(Max.)
HI Z
Enabled
Enabled
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
reproduces the optimum case when the device is enabled. To
enable the device the DIS (Disable) pin should be driven high
or left open. During this mode of operation, quiescent current
is 20mA (Max.) and the device will
respond to line demands 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 (Max.) 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.
An additional feature of the LX5119 is its compatibility with
active negation drivers.
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
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