LIN DOC #: 5121
TM
LX5121
ULTRA 27-LINE, PLUG AND PLAY SCSI TERMINATOR
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 O D U C T I O N D A T A S H E E T
DESCRIPTION
KEY FEATURES
The LX5121 Plug and Play UltraMAXTM termi-
ances. 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 these problems. The
LX5121 architecture is much more tolerant of
marginal system integrations.
Recognizing the needs of portable and
configurable peripherals, the LX5121 has a
TTL compatible sleep/disable mode. Typi-
cally, quiescent current is less than 150µA in
this mode.
Reduced component count is also inherent
in the LX5121 architecture. Traditional ter-
mination techniques require large stabiliza-
tion and transient protection capacitors of up
to 20µF in value and size. The LX5121
architecture does not require these compo-
nents, allowing all the cost savings associated
with inventory, board space, assembly, reli-
ability, and component costs.
■ Ultra-Fast Response For Fast-20 SCSI
Applications
nator represents next-generation technology
for SCSI termination applications. The low-
voltage BiCMOS architecture employed in its
design offers superior performance to older
passive and active techniques.
■ Plug And Play SCSI For Host Bus
Adapters With 3 SCSI Connectors
■ Split Disconnect For Mixing 16-Bit
(Wide) Or 8-Bit (Narrow) Buses
Linfinity's architecture employs high-speed
adaptive elements for each channel, providing
the fastest response possible. The channel
bandwidth is typically 35MHz. The LX5121
compares favorably to older linear regulator
approaches whose bandwidth's are domi-
nated by the output compensation capacitor
and are limited to the 500KHz bandwidth
region(seefurtherdiscussionintheFunctional
Description section). Linfinity's architecture
also eliminates the output compensation
capacitor typical in earlier terminator designs.
Each is approved for use with SCSI-1,-2,-3,
ULTRA and beyond — providing the highest
performance alternative available today.
Another key improvement of LX5121 prod-
ucts lies in their ability to ensure reliable, error-
free communications even in systems which
do not necessarily adhere to recommended
SCSI hardware design guidelines, such as the
use of improper cable lengths and imped-
■ 35mhz Channel Bandwidth
■ Sleep-Mode Current Less Than 150µA
■ Hot-Swap Compatible
■ NO External Compensation Capacitors
■ Compatible With Active Negation
Drivers
■ Superior Pin-for-Pin Replacement For
The UCC5621
The LX5121 has multiple disables for full
Plug and Play SCSI capability for Host Bus
Adapters with 3 SCSI connectors. It also splits
the upper 9 termination lines for mixing 16-
bit (wide) and 8-bit (narrow) buses with
minimal board trace capacitance.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
RECEIVING WAVEFORM - 20MHZ
DRIVING WAVEFORM - 20MHZ
Receiver
Driver
1 Meter, AWG 28
NOTE:
For An In-Depth
LX5121
LX5121
Discussion On Applying
SCSI, Request Linfinity
Application Note:
"Understanding The
Single-Ended SCSI Bus"
LX5268
LX5268
PACKAGE ORDER INFO
Plastic SSOP
44-pin
TJ (°C)
DB
0 to 125
LX5121CDB
Note: Available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5121CDBT)
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. 1.0 5/99
1
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