OF

LX5245/5246/5247

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 Mention 5249 as LVD only terminator

with pinout compatable with industry

standard multi-mode terminators

s Pin compatable with unitrode UCC5640

PRODUCT HIGHLIGHT

The LX5245/5246/5247 ICs are Low Volt-

age Differential (LVD) Terminators de-

signed to comply with the LVD termination

specification in the SPI-2 document.

The

LX5245/5246/5247 are designed specifically

for LVD applications. Because the LX5245/

5246/5247 support only LVD, they have lower

output capacitance than multimode termina-

tors such as the LX5240.

The

LX5245/5246/5247

Utilize

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 LX5245/5246/5247 Are

Enabled,

The

Differential

Sense

(DIFFSENSE) Pin Supplies A Voltage

Between 1.2V And 1.4V.

In application,

the terminator DIFFSENSE output is con-

nected 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 LX5245/

5246/5247 output will be HiZ.

If the

DIFFSENSE line is HIGH, indicating a high

voltage differential device the LX5245/5246/

5247 output will be HiZ.

The LX5245/5246/5247 ICs Have A TTL

Compatible DISCONNECT Pin. The

LX5245/47 is active LOW and the LX5246

is active HIGH. 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

LX5245/46/47

LX5245/46/47

OD

UltraMAX

TM

0 to 70

LX5245CPW

LX5246CPW

P A CKAGE O RDER INFO

T

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

Append the letter "T" to part number. (i.e. LX5245CPWT)

Plastic TSSOP

24-pin

28-PIN

Copyright © 2000

Rev. 0.6 10/00

1

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

PW