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參數(shù)資料
| 型號： | LX5111ACPWP |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 通用總線功能 |
| 英文描述： | ULT RA 9 - CHANNEL SCSI TERMINATOR |
| 中文描述： | 9-LINE 110 ohm SCSI BUS TERMINATOR, PDSO24 |
| 封裝： | POWER, PLASTIC, TSSOP-24 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 147K |
| 代理商： | LX5111ACPWP |
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
LX5111A/5112A
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1999
Rev. 0.1 3/99
4
P
R E L I M I N A R Y
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
DISCONNECT (5111)
DISCONNECT (5112)
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 LX5111A/5112A, with
their unique new architecture ap-
plies the maximum amount of
current regardless of line voltage
until the termination high threshold
(2.85V) is reached.
Acting as a near ideal line terminators, the LX5111A/5112A
closely reproduce the optimum case when the devices are
enabled. To enable the device the DISCONNECT pin
(DISCONNECT pin for the LX5112A) must be pulled logic
High
(logic
Low
for the LX5112A). During this mode of operation,
quiescent current is 6mA and the devices will respond to line
demands by delivering 24mA on assertion, and by imposing
2.85V on deassertion. In order to disable the device, the
DISCONNECT pin (DISCONNECT pin for the LX5112A) must
be driven logic
Low
(logic
High
for the LX5112A). This mode
of operation places the devices in a sleep state where a meager
275μA of quiescent current is con-
sumed. Additionally, all outputs are
in a Hi-Z (impedance) state. Sleep
mode can be used for power con-
servation or to completely eliminate
the terminator from the SCSI chain.
In the second case, termination
node capacitance is important to
consider. The terminators will ap-
pear as a parasitic distributed capaci-
tance on the line, which can detract from bus performance. For
this reason, the LX5111A/5112A have been optimized to have
only 3pF of capacitance per output in the sleep state.
An additional feature of the LX5111A/5112A IC's are their
compatibility with active negation drivers.
UltraMAX is a trademark of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
Outputs
Quiescent
Current
H
L
L
H
Enabled
HI Z
HI Z
6mA
275μA
275μA
Open
Open
LX5111A
DISCONNECT
LX5112A
DISCONNECT
P
OWER
U
P
/ P
OWER
D
OWN
F
UNCTION
T
ABLE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LX5112A | ULT RA 9 - CHANNEL SCSI TERMINATOR |
| LX5112ACDP | ULT RA 9 - CHANNEL SCSI TERMINATOR |
| LX5112ACPWP | ULT RA 9 - CHANNEL SCSI TERMINATOR |
| LX5115ACDT | Terminator |
| LX5115ACDWT | Terminator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX5111CDP | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5111CPWP | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5112 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULTRA 9 - CHANNEL SCSI TERMINATOR |
| LX5112A | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULT RA 9 - CHANNEL SCSI TERMINATOR |
| LX5112ACDP | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:ULT RA 9 - CHANNEL SCSI TERMINATOR |
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