OF

LX5121

DESCRIPTION

KEY FEA TURES

s Ultra-Fast Response For Fast-20 SCSI

Applications

s Plug And Play SCSI For Host Bus

Adapters With 3 SCSI Connectors

s Split Disconnect For Mixing 16-Bit

(Wide) Or 8-Bit (Narrow) Buses

s 35mhz Channel Bandwidth

s Sleep-Mode Current Less Than 150µA

s Hot-Swap Compatible

s NO External Compensation Capacitors

s Compatible With Active Negation

Drivers

s Superior Pin-for-Pin Replacement For

The UCC5621

0 to 125

LX5121CDB

PACKAGE ORDER INFO

T

Receiver

LX5121

LX5121

LX5268

LX5268

1 Meter, AWG 28

Driver

PRODUCT HIGHLIGHT

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.

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 (see further discussion in the Functional

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-

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.

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 An In-Depth

Discussion On Applying

SCSI, Request Linfinity

Application Note:

"Understanding The

Single-Ended SCSI Bus"

UltraMAX

TM

Note: Available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX5121CDBT)

Plastic SSOP

44-pin

DB

Copyright © 1999

Rev. 1.0

5/99

1

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.