OF

LX5122

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 UCC5622

0 to 125

LX5122CDB

PACKAGE ORDER INFO

T

Receiver

LX5122

LX5122

LX5268

LX5268

1 Meter, AWG 28

Driver

PRODUCT HIGHLIGHT

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.

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 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 perfor-

mance alternative available today.

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

lengths and impedances. Frequently, this

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)

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. LX5122CDBT)

Plastic SSOP

44-pin

DB

Copyright © 1999

Rev. 1.0

6/99

1

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