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參數(shù)資料
| 型號： | ML6599 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Hot-Insertable Active SCSI Terminator(熱插入有源SCSI終端器) |
| 中文描述： | 熱可插入主動SCSI端接（熱插入有源的SCSI終端器） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 83K |
| 代理商： | ML6599 |
February 1997
ML6599
Hot-Insertable Active SCSI Terminator
General Description
The ML6599 BiCMOS 9 line SCSI terminator provides
active termination in SCSI systems using single ended
drivers and receivers. Active SCSI termination helps to
effectively control analog transmission line effects such
as ringing, noise, crosstalk, and ground bounce. In
addition, the ML6599 provides support for hot-insertability
on the SCSI bus.
The ML6599 provides a V-I characteristic optimized to
minimize transmission line effects during both signal
negation and assertion using a MOSFET-based
architecture. The desired V-I characteristic is achieved by
trimming one resistor in the control block. Internal
clamping controls signal assertion transients and provides
current sink capability to handle active negation driver
overshoots above 2.85V. It provides a 2.85V reference
through an internal low dropout (1V) linear regulator.
The ML6599 also provides a disconnect function which
effectively removes the terminator from the SCSI bus. The
disconnect mode capacitance is typically less than 5pF
per line. Current limiting and thermal shutdown protection
are also included.
BLOCK DIAGRAM
NCLAMP = Negative Clamp
TERMPWR
LINEAR
REGULATOR
1V DROPOUT
2.85V
DISCNKT
CONTROL
BLOCK
V
REF
R
TRIM
MOSFETs WITH I
MAX
= 24mA
. . .
NCLAMP
.
9 TERMINATION LINES
. . .
.
NCLAMP
NCLAMP
. . .
GND
L2
L9
L1
V
REF
2.85V
FEATURES
I
Fully monolithic IC solution providing active
termination for 9 lines of the SCSI bus
I
Provides on board support for hot-insertability on the
SCSI bus
I
Low dropout voltage (1V) linear regulator, trimmed for
accurate termination current
I
Output capacitance typically < 5pF
I
Disconnect mode — logic pin to disconnect terminator
from the SCSI bus, <100μA
I
Current sinking — can sink current in excess of 10mA
per line to handle active negation driver overshoots
above 2.85V
I
Negative clamping on all lines to handle signal
assertion transients
I
Regulator can source 200mA and sink 100mA while
maintaining regulation
I
Current limit & thermal shutdown protection
REV. 1.0 10/25/2000
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