LIN DOC #: 51115
TM
LX5111A/5112A
U L T R A 9 - C H A N N E L S C S I T E R M I N A T O R
UltraMAX
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
P R E L I M I N A R Y D A T A S H E E T
DESCRIPTION
KEY FEATURES
The LX5111A/5112A SCSI terminators are part of
cable lengths and impedances. Frequently, this
situationisnotcontrolledbytheperipheralorhost
■ Ultra-Fast Response For FAST-20 SCSI
Applications
Linfinity's UltraMAX family of high-performance,
adaptive, non-linear mode SCSI products, which
are designed to deliver true UltraSCSI performance
in SCSI applications. The low voltage BiCMOS
architecture employed in their design offers su-
perior performance to older linear passive and
activetechniques. Linfinity'sUltraMAXarchitecture
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 regulator/terminator
approach used by other manufacturers. Products
using this older linear regulator approach have
bandwidths which are dominated by the output
capacitor and which are limited to 500KHz (see
further discussion in the Functional Description
section). TheUltraMAXarchitecturealsoeliminates
theoutputcompensationcapacitortypicalinearlier
terminator designs. Each is approved for use with
SCSI-1, -2, -3, UltraSCSI and beyond — providing
the highest performance alternative available to-
day.
designer and, when problems occur, they are the
first to be made aware of the problem. The
LX5111A/12A architecture is much more tolerant
of marginal system integrations.
■ 35MHz Channel Bandwidth
■ 3.0V Operation
■ Less Than 3pF Output Capacitance
■ Thermally Self-Limiting
Recognizing the needs of portable and
configurable peripherals, the LX5111A/12A have
a TTL compatible sleep/disable mode. Quiescent
current is typically less than 275µA in this 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
components which, often times results in field
returns due to mishandling.
Reduced component counts is also inherent in
the LX5111A/12A's architecture. Traditional ter-
minationtechniquesrequirelargestabilizationand
transient protection capacitors of up to 20µF in
value and size. The LX5111A/12A architecture
does not require these components, allowing all
the cost savings associated with inventory, board
space, assembly, reliability, and component costs.
■ NO External Compensation Capacitors
■ Implements 8-bit Or 16-bit (Wide)
Applications
■ Compatible with Active Negation
Drivers
■ Compatible With Passive And Active
Terminations
■ Approved For Use With SCSI 1, 2, 3
And Ultra SCSI
■ Hot-Swap Compatible
■ Pin-For-Pin Compatible With
LX5211 and UC5606 (LX5111)
■ Pin-For-Pin Compatible With
LX5212 And UC5603/5613/5614
(LX5112)
Another key improvement offered by the
LX5111A/12A lies in their ability to insure reliable,
error-free communications even in systems which
do not adhere to recommended SCSI hardware
design guidelines, such as the use of improper
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
RECEIVING WAVEFORM - 20MHZ
DRIVING WAVEFORM - 20MHZ
Receiver
Driver
NOTE:
1 Meter, AWG 28
For An In-Depth
LX5111A/5112A
LX5111A/5112A
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The Single-
Ended SCSI Bus"
LX5268
LX5268
PACKAGE ORDER INFORMATION
Plastic SOIC
16-pin, Power
Plastic TSSOP
PWP
24-pin, Power
TA (°C)
DP
LX5111ACDP
LX5112ACDP
LX5111ACPWP
LX5112ACPWP
0 to 70
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5111ACDPT)
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1999
Rev. 0.1 3/99
1
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