OF

LX5248/LX5249

DESCRIPTION

KEY FE A TURES

s 2.5pF Typical Disabled Output

Capacitance

s Fast Response, No External Capacitors

Required

s 5µA Supply Current In Disconnect Mode

s 20mA Supply Current During Normal

Operation

s Logic Command Disconnects All

Termination Lines

s Diffsense Line Driver

s Current Limit And Thermal Protection

s Compatible With The Pending SPI-2 LVD

Specification

s Pin Compatible With Industry Standard

Multi-Mode Terminators

s For UCC5240 Pin Compatible LVD ONLY

Terminator (See LX5245/5246)

PRODUCT HIGHLIGHT

The LX5248/49 IC is a Low Voltage Dif-

ferential (LVD) Terminator designed to

comply with the LVD termination specifica-

tion in the SPI-2 document.

The LX5248/

49 is designed specifically for LVD applica-

tions. Because the LX5248/49 supports only

LVD, it has lower output capacitance than

multimode terminators such as the LX5240.

The LX5248/49 Utilizes Linfinity’s

UltraMAX Technology which delivers the

ultimate in SCSI bus performance while

saving component cost and board area.

Elimination of the external capacitors also

mitigates the need for a lengthy capacitor

selection process. The individual high band-

width drivers also maximize channel sepa-

ration and reduces channel-to-channel noise

and cross talk.

The high-bandwidth

UltraMAX architecture insures ULTRA-2 per-

formance, while providing a clear migration

path to ULTRA-3 and beyond.

When The LX5248/49 Is Enabled, The

Differential Sense (DIFFSENSE) Pin Sup-

plies A Voltage Between 1.2V And 1.4V.

In application, the terminator DIFFSENSE

output is connected to the system

DIFFSENSE line. If there are no single ended

or HVD devices attached to the system the

LVD output will be enabled.

If the

DIFFSENSE line is LOW, indicating a single

ended device, the LX5248/49 output will be

HiZ. If the DIFFSENSE line is HIGH, indi-

cating a high voltage differential device the

LX5248/49 output will be HiZ.

The LX5248/49 IC Has A TTL Compat-

ible DISCONNECT Pin. The LX5248/49 is

active LOW.

During sleep mode, power

dissipation is reduced to a meager 5µA, while

also placing all outputs in a HI Z state. Also

during sleep mode, the DIFFSENSE function

is disabled and is placed in a HI Z state.

V

(+)

V

(-)

V

NEGATED

0V

100mV

-100mV

LX5248/49

LX5248/49

OD

UltraMAX

TM

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

Append the letter "T" to part number. (i.e. LX5249CPWT)

Copyright © 2001

Rev. 0.6 10/00

1

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

0 to 70KLX5249CDBKLX5249CPWKLX5248CPW

P ACKAGE ORDER INFORM A T ION

T

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