LX5218 Datasheet, PDF (1/12 Pages) Microsemi Corporation – 9-CHANNEL PLUG AND PLAY SCS I TERMINATOR

T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N DO C # : 5218
UltraMAX^TM
LX5218
9-CHANNEL PLUG AND PLAY SCSI TERMINATOR
PRODUCTION DATA SHEET
DESCRIPTION
The LX5218 SCSI terminator is part of Linfinity's
UltraMAX family of high-performance, adaptive, non-
linear mode SCSI products, which are designed to
deliver true UltraSCSI performance in SCSI applica-
tions. The low voltage BiCMOS architecture em-
ployed in their design offers superior performance
to older linear passive and active techniques.
Linfinity's UltraMAX architecture employs high-speed
adaptive elements for each channel, thereby providing
the fastest response possible — typically 35MHz,
which is 100 times faster than the older linear regu-
lator/terminator approach used by other manufactur-
ers. Products using this older linear regulator ap-
proach have bandwidths which are dominated by the
output capacitor and which are limited to 500KHz
(see further discussion in the Functional Description
section). The UltraMAX architecture also eliminates
the output compensation capacitor typical in earlier
terminator designs. It is approved for use with SCSI-
1, -2, -3, UltraSCSI and beyond — providing the
highest performance alternative available today.
Another key improvement offered by the LX5218
lies in its ability to insure reliable, error free com-
munications even in systems which do not adhere
to recommended SCSI hardware design guidelines,
such as the use of improper cable lengths and
impedances. Frequently, this situation is not con-
trolled by the peripheral or host designer and, when
problems occur, they are the first to be made aware
of the problem. The LX5218 architecture is much
more tolerant of marginal system integrations.
The LX5218 has two disconnect pins for SCSI Plug
and Play (PnP) applications. Quiescent current is
typically less than (275µA) in disable mode, while
the output capacitance is also less than 3pF. The
obvious advantage of extended battery life for
portable systems is inherent in the product's sleep-
mode feature. Additionally, the disable function
permits factory-floor or production-line
configurability, reducing inventory and product-line
diversity costs. Field configurability can also be
accomplished without physically removing compo-
nents which, often times results in field returns due
to mishandling.
Reduced component counts is also inherent in
the LX5218 architecture. Traditional termination
techniques require large stabilization and transient
protection capacitors of up to 20µF in value and
size. The LX5218 architecture does not require these
components, allowing all the cost savings associated
with inventory, board space, assembly, reliability,
and component costs.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
KEY FEATURES
s SCSI PLUG AND PLAY, DUAL LOW
DISCONNECT, LOGIC LOW COMMAND
DISCONNECTS ALL TERMINATION LINES
s HOT SWAP COMPATIBLE
s ULTRA-FAST RESPONSE FOR FAST-20
SCSI APPLICATIONS
s 35MHz CHANNEL BANDWIDTH
s 3.5V OPERATION
s LESS THAN 3pF OUTPUT CAPACITANCE
s DISABLE-MODE CURRENT LESS THAN
275µA
s THERMALLY SELF LIMITING
s NO EXTERNAL COMPENSATION
CAPACITORS
s IMPLEMENTS 8-BIT OR 16-BIT (WIDE)
APPLICATIONS
s COMPATIBLE WITH ACTIVE NEGATION
DRIVERS (60mA / CHANNEL)
s COMPATIBLE WITH PASSIVE AND
ACTIVE TERMINATIONS
s APPROVED FOR USE WITH SCSI-1, -2, -3
AND ULTRASCSI
s CONSULT FACTORY FOR APPLICATION
TEST REPORT
PRODUCT HIGHLIGHT
R E C E I V I N G W AV E F O R M - 2 0 M H Z
D R I V I N G W AV E F O R M - 2 0 M H Z
Copyright © 1997
Rev. 1.7 12/97
Receiver
Driver
LX5218
1 Meter, AWG 28
LX5218
LX5268
LX5268
PACKAGE ORDER INFORMATION
T_J (°C)
DW
Plastic
16-pin
SOWB
PW
Plastic
20-pin
TSSOP
0 to 70
LX5218CDW
LX5218CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5218CDWT)
NOTE:
For An In-Depth
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]
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