DESCRIPTION

The LX5212 is a nine-line active terminator

for the SCSI parallel bus. This SCSI standard

recommends active termination at both ends

of the SCSI bus.

During disconnect mode, the LX5212 re-

quires a meager 500nA of supply current

while offering only 2.5pF of output capaci-

tance. To enter this low-power mode, the

disconnect pin can be left open (floating)

or driven high, thereby disconnecting the

terminating resistors and placing the internal

low dropout regulator into low-power

mode. In disconnect mode, each termina-

tion line presents a high impedance to the

SCSI bus with the overall effect being to

preserve high signal integrity and yield

subsequent reliable, error-free communica-

tions.

During normal operation, the LX5212

consumes only 600µA of current, which is

the lowest enabled supply current of any

terminator available on the market today.

Linfinity's proprietary BiCMOS low dropout

regulator architecture enables this unique

and very efficient operating characteristic.

The LX5212 also offers a precisely

trimmed channel output current specified to

a 5% tolerance. The maximum value of the

output current is trimmed as closely as

possible to the SCSI standard maximum

specification to give the highest possible

noise margin for fast SCSI operation. And

the LX5212 sinks up to 30mA of current,

making it compatible with today's fast active

negation drivers.

The LX5212 is a superior, pin-for-pin

replacement for a variety of industry prod-

ucts, such as the UC5614.

KEY FEA TURES

s 2.5pF OUTPUT CAPACITANCE DURING

DISCONNECT

s 500nA SUPPLY CURRENT IN DISCONNECT

MODE

s 600µA SUPPLY CURRENT DURING NORMAL

OPERATION

s 30mA SINK CURRENT FOR ACTIVE

NEGATION

s LOGIC COMMAND DISCONNECTS ALL

TERMINATION LINES

s CURRENT LIMIT AND THERMAL PROTECTION

s COMPATIBLE WITH SCSI 1, 2, 3, AND FAST

20 STANDARDS

s HOT SWAP COMPATIBLE

s CONSULT FACTORY FOR APPLICATION TEST

REPORT: 5212TR

s EVALUATION BOARD AVAILABLE

PRODUCT HIGHLIGHT

OF

LX5212

P ACKAGE ORDER INFORMA TION

T

Plastic DIP

16-pin

N

Plastic TSSOP

24-pin, Power

PWP

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX5212CDPT)

Plastic SOIC

16-pin, Power

DP

0 to 70

LX5212CN

LX5212CPWP

LX5212CDP

Receiver

LX5212

LX5212

LX5268

LX5268

1 Meter, AWG 28

Driver

NOTE:

For An In-Depth

Discussion On Applying

SCSI, Request Linfinity

Application Note:

"Understanding The

Single-Ended SCSI Bus"

Copyright © 1997

Rev. 1.8

11/97

1

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.