Microsemi

Integrated Products Division

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

Page 1

Copyright

 2000

Rev. 1.0a, 2003-06-30

LX5255

9-Line LVD SCSI Terminator

I N T E GRA T ED

PR ODUC T S

DESCRIPTION

The LX5255 is a Low Voltage

Differential

(LVD)

terminator

designed to comply with the LVD

termination specification in the SPI-4

document. The LX5255 is specifically

designed for LVD only applications.

Because the LX5255 supports only

LVD, it has lower output capacitance

than multimode terminators such as

the LX5250.

The LX5255 utilizes an industry

standard

LVD

architecture.

The

individual high bandwidth drivers

maximize channel separation, reduce

channel-to-channel noise and cross

talk to insure Ultra320 performance.

When the LX5255 is enabled, the

Differential Sense (DIFSENS) pin

supplies a voltage between 1.2V and

1.4V. In application, the terminator

DIFFB input is connected to the system

DIFSENS line. If there are no single

ended or High Voltage Differential

(HVD) devices attached to the system,

the LVD output will be enabled. If the

DIFSENS line is LOW, indicating a

single ended device, the LX5255 output

will be HiZ. If the DIFSENS line is

HIGH, indicating a HVD device, the

LX5255 output will be HiZ.

The LX5255 has a TTL compatible

sleep/disable mode. Applying a logic

HIGH to the DISC pin puts the LX5255

in sleep mode. During sleep mode,

power dissipation is reduced to a meager

5µA while also placing all outputs and

the DIFSENS function in a HiZ state.

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)

2.5pF Maximum Disabled Output

Capacitance

Fast Response, No External

Capacitors Required

5µA Supply Current in Disconnect

Mode

30mA Supply During Normal

Operation

Logic Command Disconnects All

Termination Lines

DIFSENS Line Driver

Current Limit and Thermal

Protection

Pin Compatible With Unitrode

UCC5640

TY PICAL APPLICATION

LX 5255

LX 5255

+

-

+

-

LX5255 Typical Application

PACKAGE ORDER INFO

PW

TSSOP

24-Pin

0 to 70

LX5255CPW

Note: Available in Tape & Reel.

Append the letter “T” to the part number. (i.e.

LX5255CPWT)