LIN DOC #: 5120
UltraMAXTM
LX5120
ULTRA 27-LINE SCSI TERMINATOR
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
TheLX5120UltraMAXTM terminatorrepresents
next-generation technology for SCSI termina-
tion applications. The low-voltage BiCMOS
architecture employed in its design offers
superior performance to older passive and
active techniques.
do not necessarily adhere to recommended
■ Ultra-Fast Response For Fast-20 SCSI
Applications
SCSI hardware design guidelines, such as the
use of improper cable lengths and imped-
ances. Frequently, this situation is not con-
trolledbytheperipheralorhostdesignerand,
when problems occur, they are the first to
be made aware of these problems. The
LX5120 architecture is much more tolerant
of marginal system integrations.
Recognizing the needs of portable and
configurable peripherals, the LX5120 has a
TTL compatible sleep/disable mode. To
enter this mode, the DIS pin must be driven
low, thereby disconnecting the LX5120 from
the SCSI bus. Quiescent current is less than
150µA in this mode.
Reduced component count is also inherent
in the LX5120 architecture. Traditional ter-
mination techniques require large stabiliza-
tion and transient protection capacitors of up
to 20µF in value and size. The LX5120
architecture does not require these compo-
nents, allowing all the cost savings associated
with inventory, board space, assembly, re-
liability, and component costs.
■ Split Disconnect For Mixing 16-Bit
(Wide) Or 8-Bit (Narrow) Buses
■ 35mhz Channel Bandwidth
■ Sleep-Mode Current Less Than 150µA
■ Hot-Swap Compatible
Linfinity's architecture employs high-speed
adaptiveelementsforeachchannel,providing
the fastest response possible. The channel
bandwidth is typically 35MHz. The LX5120
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 (see further discussion in the Func-
tional Description section). Linfinity's archi-
tecture also eliminates the output compen-
sation 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 to-
day.
■ NO External Compensation Capacitors
■ Compatible With Active Negation
Drivers
■ Superior Pin-for-Pin Replacement For
The UCC5620
Another key improvement of LX5120 prod-
uctsliesintheirabilitytoensurereliable,error-
free communications even in systems which
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
LX5120
LX5120
Discussion On Applying
SCSI, Request Linfinity
Application Note:
LX5268
LX5268
PACKAGE ORDER INFO
"Understanding The
Single-Ended SCSI Bus"
Plastic SSOP
36-pin
TJ (°C)
DB
0 to 125
LX5120CDB
Note: Available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5120CDBT)
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 © 2000
Rev. 1.0 4/00
1