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參數資料
| 型號： | ML6509 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Active SCSI Terminator(SCSI系統(tǒng)的有源終端器) |
| 中文描述： | 活躍的SCSI終結者（的SCSI系統(tǒng)的有源終端器） |
| 文件頁數： | 5/10頁 |
| 文件大?。?/td> | 121K |
| 代理商： | ML6509 |
ML6509
REV. 1.0 10/25/2000
5
Thus in an 8-bit wide SCSI bus arrangement (“A” cable),
two ML6509s would be needed at each end of the SCSI
cable in order to terminate the 18 active signal lines.
16-bit wide SCSI would use three ML6509s, while 32-bit
wide SCSI bus would require five ML6509s.
In a typical SCSI subsystem, the open collector driver in
the SCSI transceiver, when asserted, pulls low and when
negated, the termination resistance serves as the pull-up.
Shown in figure 2 is a typical cable response to a pulse.
The receiving end of the cable will exhibit a single time
delay. When negated, the initial step will reach an
intermediate level defined as V
STEP
. With the higher SCSI
data rates, sampling could occur during this step portion.
In order to get the most noise margin, the step needs to be
as high as possible to prevent false triggering. For this
reason the regulator voltage and the resistor defining the
MOSFETs characteristic is trimmed to ensure that the I
O
is
as close as possible to the SCSI max current specification.
V
STEP
is defined as follows :
V
V
I
Z
STEP
OL
O
O
=
+
×
(
)
where
V
OL
is the Driver output low voltage,
I
O
is current from receiving terminator
Z
O
is characteristic impedance of cable.
Figure 3. V-1 Characteristics of Various
SCSI Termination Schemes
IDEAL
ML6509
BOULAY
220/330
285V
2.7V
2.5V
0.2V
TERMINATOR (SOURCE)
DRIVER (SINK)
20mA
40mA
24mA
48mA
V
I
Figure 2. Application Diagram Showing Typical SCSI Bus Configuration with the ML6509
TERMPWR LINE
ML6509
TERMPWR
VREF
GND
L9
L2 L1
DISCNKT
LPWR
0.1μF
10μF
TERMPWR
VREF
GND
L9
L1 L2
ML6509
SCSI XCVR
SCSI XCVR
SCSI XCVR
V
REG
V
STEP
V
REG
LINE
ASSERTED
LINE
NEGATED
10μF
0.1μF
10μF
. . .
. . .
.
.
V
OL
SCSI CABLE
DISCNKT
LPWR
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ML6509 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML6509CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML6509CS WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML6509CS UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML6509CT | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Active SCSI Terminator |
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