Microsemi Corporation LX5240CPW, LX5240CDB Datasheet

LIN DOC #:

5240

UltraMAX

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

THE INFINITE POWER OF INNOVATION

DESCRIPTION KEY FEATURES

The LX5240 is a multimode SCSI terminator with
plug-and-play capability that conforms to the
SCSI Parallel Interconnect-2 (SPI-2) specification
developed by the T10 standards committee for
low voltage differential (LVD) termination, while
providing backwards compatibility to the SCSI,
SCSI-2, and SPI single-ended specifications.
Multimode compatibility permits the use of
legacy devices on the bus without hardware
alterations. Automatic mode selection is
achieved through voltage detection on the
diffsense line.

The LX5240 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
bandwidth drivers also maximize channel sepa­ration and reduce channel to channel noise and
cross talk. The high bandwidth architecture
insures ULTRA2 performance while providing
a clear migration path to ULTRA3 and beyond.

When the LX5240 is enabled, the differential
sense (DIFFSENSE) pin supplies a voltage be­tween 1.2V and 1.4V. In application, this pin

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

is tied to the DIFFSENSE input of the corre­sponding LVD transceivers. This action enables
the LVD transceiver function. DIFFSENSE is
capable of supplying a maximum of 15mA.
Tying the DIFFSENSE pin high places the
LX5240 in a HI Z state indicating the presence
of an HVD device. Tying the pin low places
the part in a single-ended mode while also
signaling the multimode transceiver to operate
in a single-ended mode.

The LX5240 supports full Plug and Play
functionality with the DISCONNECT A and B
pins. These logic compatible pins place the
device in operational or sleep modes. During
sleep mode, power dissipation is reduced to
a meager 15µA 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.

Another key feature of the LX5240 is the
master / slave function. Driving this pin high
or floating the pin enables the 1.3V DIFFSENSE
reference. Driving the pin low disables the on
board DIFFSENSE reference and enables use
of an external master reference device.

PRODUCTION DATA SHEET

TM

LX5240

■Auto-Selectable LVD Or

Single-Ended Termination

■3.0pF Maximum Disabled Output

Capacitance

■Fast Response, No External Capacitors

Required

■Compatible With Active Negation

Drivers

■15µA Supply Current In Disconnect

Mode

■Logic Command Disconnects All

Termination Lines

■Diffsense Line Driver

■Ground Driver Integrated For Single-

Ended Operation

■Current Limit And Thermal Protection

■Hot-Swap Compatible

(Single-Ended)

■Compatible With SCSI 1, 2, 3, Fast-20,

And The Pending SPI-2 LVD

■Plug And Play Compatible

■See LX5245/5246, LVD Termination Only

PRODUCT HIGHLIGHT

BUS VOLTAGE V

VOD = V

V

(+)

CM

V

V

(-)

100mV

0V

-100mV

OD

- V

, Logic = 0

(-)

(+)

NEGATED

LX5240 LX5240

PACKAGE ORDER INFO

T

(°C)

A

Plastic SSOP

DB

36-pin

0 to 70 LX5240CDB LX5240CPW

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

Append the letter "T" to part number. (i.e. LX5240CDBT)

Plastic TSSOP

PW

24-pin

Copyright © 1999

Rev. 1.1 10/00

LINFINITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]

1

PRODUCT DATABOOK 1996/1997

LX5240

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

RODUCTION DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

TermPwr Voltage.................................................................................................+7V

Operating Junction Temperature

Plastic (DB, PW Packages)..........................................................................150°C

Storage Temperature Range..............................................................-65°C to 150°C

Lead Temperature (Soldering, 10 seconds)....................................................300°C

Note 1.Exceeding these ratings could cause damage to the device. All voltages are with

DB PACKAGE:

PW PACKAGE:

Junction Temperature Calculation: TJ = TA + (P
The θ
system. All of the above assume no ambient airflow.

respect to Ground. Currents are positive into, negative out of the specified
terminal.

THERMAL DATA

D

x θ

θθ

θ

θθ

JA

θθ

θ

θθ

JA

).

JA

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

numbers are guidelines for the thermal performance of the device/pc-board

JA

MASTER / SLAVE FUNCTION TABLE

MASTER / DIFFSENSE Output

SLAVE Status Current

L* HI Z 0mA

H 1.3V 15mA Source

Open (Pull-up) 1.3V 15mA Source

* When in Low state, terminator will detect state of DIFFSENSE line.

50°C/W

100°C/W

PACKAGE PIN OUTS

136

N.C.

235

N.C.

DISCONNECT A

HEATSINK
HEATSINK
HEATSINK

DISCONNECT B

("N.C." = No Internal Connection)

1+

2+

3+

4+

5+

DISCONNECT B

GND

("N.C." = No Internal Connection)

334

433

1+

532

1-

631

2+

730

2-

829

928

10 27

11 26

3+

12 25

3-

13 24

4+

14 23

4-

15 22

5+

16 21

5-

17 20

18 19

GND

DB PACKAGE (Top View)

1 24

223

1-

322

421

2-

520

619

3-

718

817

4-

916
10 15

5-

11 14

12 13

PW PACKAGE (Top View)

UltraMAX

V

TERM

HVD
LVD
SE
9­9+
8­8+
HEATSINK
HEATSINK
HEATSINK
7­7+
6­6+
DIFF B
DIFFSENSE
MASTER/SLAVE

V

TERM

DISCONNECT A
9­9+
8­8+
7­7+
6­6+
DIFFSENSE
MASTER/SLAVE

DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE

DISCONNECT ADISCONNECT B

HL

LH

HL

LH

HL

LH

LL

H H X Disable HI Z 10µA

Open Open

2

DIFF Outputs Quiescent

SENSE Status Type Current

L < 0.5V Enable S.E. 7mA

0.7 to 1.9V Enable LVD 21mA

H > 2.4V Disable HI Z 1mA

Copyright © 1999

Rev. 1.1 10/00