Microsemi Corporation LX5249CPW, LX5249CDB, LX5248CPW Datasheet

9-LINE LVD SCSI TERMINATOR

PRELIMINARY DATA SHEET

THE INFINITE POWER OF INNOVATION

LX5248/LX5249

DESCRIPTION KEY FEATURES

■2.5pF Typical Disabled Output

Capacitance

■Fast Response, No External Capacitors

Required

■5µA Supply Current In Disconnect Mode

■20mA Supply Current During Normal

Operation

■Logic Command Disconnects All

Termination Lines

■Diffsense Line Driver

■Current Limit And Thermal Protection

■Compatible With The Pending SPI-2 LVD

Specification

■Pin Compatible With Industry Standard

Multi-Mode Terminators

■For UCC5240 Pin Compatible LVD ONLY

Terminator (See LX5245/5246)

PRODUCT HIGHLIGHT

The LX5248/49 IC is a Low Voltage Dif­ferential (LVD) Terminator designed to

comply with the LVD termination specifica­tion in the SPI-2 document. The LX5248/
49 is designed specifically for LVD applica­tions. 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 band­width drivers also maximize channel sepa­ration and reduces channel-to-channel noise
and cross talk. The high-bandwidth
UltraMAX architecture insures ULTRA-2 per­formance, while providing a clear migration
path to ULTRA-3 and beyond.

When The LX5248/49 Is Enabled, The
Differential Sense (DIFFSENSE) Pin Sup­plies 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, indi­cating a high voltage differential device the
LX5248/49 output will be HiZ.

The LX5248/49 IC Has A TTL Compat­ible 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

CM

VOD = V

(-)

- V

(+)

, Logic = 0

NEGATED

0V

100mV

-100mV

LX5248/49 LX5248/49

BUS VOLTAGE/ V

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

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

LINFINITY MICROELECTRONICS INC.

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

0 to 70K LX5249CDBK LX5249CPWK LX5248CPW

PACKAGE ORDER INFORMATION

T

A

(°C)

DB

Plastic SSOP
36-pin

PW

Plastic TSSOP
24-pin

PW

Plastic TSSOP
28-pin

9-LINE LVD SCSI TERMINATOR

LX5248/LX5249

PRODUCT DATABOOK 1996/1997

Copyright © 2001

Rev. 0.6 1/01

2

PRELIMINARY DATA SHEET

UltraMAX

TermPwr Voltage..............................................................................................+6.5V

Signal Line Voltage...................................................................................0V to 6.5V

Differential Voltage...................................................................................0V to 6.5V

Operating Junction Temperature

Plastic (PW Package)...................................................................................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

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

ABSOLUTE MAXIMUM RATINGS (Note 1)

PACKAGE PIN OUTS

LX5248/LX5249

DIFFSENSE

Outputs Quiescent

DISCONNECT Status Type Current

L L < 0.5V Disable HiZ 2mA

L 0.7V to 1.9V Enable LVD 21mA

L H > 2.4V Disable HiZ 2mA

H X Disable HiZ 10µA

Open X Disable HiZ 10µA

DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE

DB PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θθ

θ

JA

50°C/W

PW PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θθ

θ

JA

100°C/W

Junction Temperature Calculation: TJ = TA + (P

D

x θ

JA

).

The θ

JA

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

system. All of the above assume no ambient airflow.

THERMAL DATA

LX5249C ("N.C." = No Internal Connection)

DB PACKAGE (Top View)

N.C.
N.C.
N.C.

1+

1-

2+

2­HEATSINK/GND
HEATSINK/GND
HEATSINK/GND

3+

3-

4+

4-

5+

5-

DISCONNECT

GND

V

TERM

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

136

235

334

433

532

631

730

829

928

10/ 27

11/ 26

12/ 25

13/ 24

14/ 23

15/ 22

16/ 21

17/ 20

18/ 19

LX5249CPW ("N.C." = No Internal Connection)

PW PACKAGE (Top View)

V

TERM

N.C.
9­9+
8­8+
7­7+
6­6+
DIFFSENSE
MASTER/SLAVE

1 24

223

322

421

520

619

718

817

916

10/ 15

11/ 14

12/ 13

1+

1-

2+

2-

3+

3-

4+

4-

5+

5-

DISCONNECT

GND

MASTER / DIFFSENSE Output

SLAVE Status Current

L* HI Z 0mA

H 1.3V 15mA Source

Open (Pull-up) 1.3V 15mA Source

MASTER / SLAVE FUNCTION TABLE

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

LX5248CPW ("N.C." = No Internal Connection)

PW PACKAGE (Top View)

V

TERM

LVD

9­9+
8­8+
N.C.
7­7+
6­6+
DIFFB
DIFFSENSE
MASTER/SLAVE

1 28

227

326

425

524

623

722

821

920

10/ 19

11/ 18

12/ 17

13/ 16

14/ 15

N.C.

1+

1-

2+

2-

N.C.

3+

3-

4+

4-

5+

5-

DISCONNECT

GND