LX5248 Microsemi Corporation, LX5248 Datasheet

LX5248

Manufacturer Part Number

LX5248

Description

9 - LINE LVD SCSI TERMINATOR

Manufacturer

Microsemi Corporation

Datasheet

1.LX5248.pdf (6 pages)

Current page: 1 of 6
Download datasheet (171Kb)

Rev. 0.6 10/00

H E

The LX5248/49 IC is a Low Voltage Dif-

ferential (LVD) Terminator designed to

comply with the LVD termination specifica-

tion in the SPI-2 document. The LX5248/

49 is designed specifically for LVD applica-

tions. Because the LX5248/49 supports only

LVD, it has lower output capacitance than

multimode terminators such as the LX5240.

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.

UltraMAX architecture insures ULTRA-2 per-

formance, while providing a clear migration

path to ULTRA-3 and beyond.

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

The LX5248/49 Utilizes Linfinity’s

N F I N I T E

(+)

(-)

11861 W

The high-bandwidth

O W E R

0 to 70K

ESTERN

(°C)

LX5248/49

O F

D E S C R I P T I O N

I N

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

VENUE

P A C K A G E O R D E R I N F O R M A T I O N

Append the letter "T" to part number. (i.e. LX5249CPWT)

N N O V A T I O N

I N I T Y

LX5249CDBK

, G

Plastic SSOP

36-pin

ARDEN

Differential Sense (DIFFSENSE) Pin Sup-

plies 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.

DIFFSENSE line is LOW, indicating a single

ended device, the LX5248/49 output will be

HiZ. If the DIFFSENSE line is HIGH, indi-

cating a high voltage differential device the

LX5248/49 output will be HiZ.

ible DISCONNECT Pin. The LX5248/49 is

active LOW.

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.

P R O D U C T H I G H L I G H T

When The LX5248/49 Is Enabled, The

The LX5248/49 IC Has A TTL Compat-

ROVE

I C R O E L E C T R O N I C S

, CA. 92841, 714-898-8121, F

During sleep mode, power

LX5249CPWK

UltraMAX

Plastic TSSOP

24-pin

-100mV

100mV

9 - L

R E L I M I N A R Y

I N E

If the

LX5248/49

LV D S C S I T

LX5248CPW

N C

Plastic TSSOP

28-pin

= V

LX5248/LX5249

: 714-893-2570

NEGATED

(-)

- V

(+)

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)

, Logic = 0

K E Y F E A T U R E S

A T A

E R M I N A T O R

H E E T

Related parts for LX5248

LX5248 Summary of contents

Page 1

... The LX5248/ Low Voltage Dif- ferential (LVD) Terminator designed to comply with the LVD termination specifica- tion in the SPI-2 document. The LX5248 designed specifically for LVD applica- tions ...

Page 2

... DISCONNECT GND LX5249CPW ("N.C." Internal Connection) PW PACKAGE (Top View DISCONNECT GND LX5248CPW ("N.C." Internal Connection) PW PACKAGE (Top View) V TERM HVD LVD HEATSINK/GND HEATSINK/GND HEATSINK/GND DIFF B DIFFSENSE MASTER/SLAVE V TERM N ...

Page 3

... Note 2. Range over which the device is functional. (Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C DISCONNECT: LX5248/ Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) ...

Page 4

... ZD(-) Zcm 52.5 200 LVD 1.25V ZD(+) 52.5 10mA 1.07mA HVD LATCH Window LVD Comp. SE Power ON & Mode Change Delay FIGURE 1 — LX5248 / 5249 Block Diagram UltraMAX 1.07mA HVD LVD (-) LVD SE HVD LVD (+) LVD SE HVD LVD SE Copyright © 2001 Rev. 0.6 1/01 ...

Page 5

Page 6

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