LIN DOC #: 5122
TM
LX5122
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
D E S C R I P T I O N
K E Y F E A T U R E S
The LX5122 Plug and Play UltraMAXTM ter-
minator represents next-generation technol-
ogy for SCSI termination applications. The
low-voltage BiCMOS architecture employed
in its design offers superior performance to
older passive and active techniques.
lengths and impedances. Frequently, this
■ Ultra-Fast Response For Fast-20 SCSI
Applications
situation is not controlled by the peripheral
or host designer and, when problems occur,
they are the first to be made aware of these
problems. The LX5122 architecture is much
more tolerant of marginal system integra-
tions.
Recognizing the needs of portable and
configurable peripherals, the LX5122 has a
TTL compatible sleep/disable mode. Qui-
escent current is less than 150µA in this
mode.
Reduced component count is also inher-
ent in the LX5122 architecture. Traditional
termination techniques require large stabi-
lization and transient protection capacitors
of up to 20µF in value and size. The LX5122
architecture does not require these com-
ponents, allowing all the cost savings as-
sociated with inventory, board space, as-
sembly, reliability, and component costs.
The LX5122 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)
b u ses with min imal b o ard trace
capacitance.
■ 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
LX5122 compares favorably to older linear
regulator approaches whose bandwidth's
are dominated by the output compensation
capacitor and are limited to the 500KHz
bandwidth region (see further discussion in
the Functional Descrip tion 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 perfor-
mance alternative available today.
■ 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 UCC5622
Another key improvement of LX5122
products lies in their ability to insure re-
liable, error free communications even in
systems which do not necessarily adhere to
recommended SCSI hardware design guide-
lines, such as the use of improper cable
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
P R O D U C T H I G H L I G H T
RECEIVIN G W AVEFO RM - 2 0 MHZ
DRIVIN G W AVEFO RM - 2 0 MHZ
Receiver
Driver
1 Meter, AWG 28
NOTE:
For An In-Depth
LX5122
LX5122
Discussion On Applying
SCSI, Request Linfinity
Application Note:
LX5268
LX5268
P A CK A G E O R D E R I N F O
"Understanding The
Single-Ended SCSI Bus"
Plastic SSOP
44-pin
T (°C)
DB
J
0 to 125
LX5122CDB
Note: Available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5122CDBT)
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 6/ 99
1
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