Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Copyright

© 2000

Rev. 1.0c, 2005-02-08

LX5261

27-Line LVD SCSI Source/Sink Regulator

TM

®

DESCRI PTI O N

The LX5261 is a source/sink

regulator designed to provide the

correct reference voltages and bias

currents for SCSI LVD applications.

With the proper LVD termination

network (475Ω, 121Ω, 475Ω), the

LX5261 assures that LVD performance

is compliant to the SPI-2 (Ultra2), SPI-

3 (Ultra160) and SPI-4 (Ultra320)

specification.

The LX5261 provides two fixed

regulated outputs (1.75V and 0.75V)

each capable of sourcing / sinking

200mA, along with a buffered 1.3V

output for DIFSENS signaling.

The

LX5261

features

on-chip

trimming of the internal voltage enabling

precise output voltages; typically +/- 1%

of its specified value. Thermal Shutdown

and Current Limiting is integrated on-

chip.

The LX5261 is available in the 16-

pin SOIC (DP) package.

IMPORTANT:

For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

KEY FEATUR ES

Compliant with SPI-2 (Ultra2),

SPI-3 (Ultra160), and SPI-4

(Ultra320)

2.7V to 5.25V Operation

200mA Source/Sink Capability

DIFSENS Line Driver

Current Limit and Thermal

Protection

Pin Compatible With Unitrode

UCC561

TY PI CAL APPLI CATI O N

+

-

7

3

VTERM

2.7V to 5.25V

1.3V

Reference

+

-

1.75V

Reference

+

-

0.75V

Reference

1.3V +/- 0.1V

1.75V +/- 0.05V

200mA source/sink

0.75V +/- 0.05V

200mA source/sink

2

4

GND

DIFSENS

VOUT1

VOUT2

475

1%

475

1%

121

1%

L1-

L1+

27

LVD

Pairs

4.7uF

4.7uF

4.7uF

475

1%

475

1%

121

1%

L27-

L27+

6

PACKAGE ORDER INFO

DP

SOIC

16-Pin

°C)

RoHS Compliant / Pb-free

Transition DC: 0440

0 to 70

LX5261CDP

Note: Available in Tape & Reel.

Append the letters “TR” to the part number. (i.e. LX5261CDP-TR)