lx5225 Microsemi Corporation, lx5225 Datasheet

lx5225

Manufacturer Part Number

lx5225

Description

Ultra 18-line, Plug And Play Scsi Terminator

Manufacturer

Microsemi Corporation

Datasheet

1.LX5225.pdf (4 pages)

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Rev. 1.0

H E

The LX5225 SCSI terminator is part of Linfinity's

UltraMAX family of high-performance, adap-

tive, non-linear mode SCSI products, which are

designed to deliver true UltraSCSI performance

in SCSI applications. The low voltage BiCMOS

architecture employed in its design offers su-

perior performance to older linear passive and

active techniques.

high-speed adaptive elements for each chan-

nel, thereby providing the fastest response

possible — typically 35MHz, which is 100 times

faster than the older linear regulator/terminator

approach used by other manufacturers. Prod-

ucts using this older linear regulator approach

have bandwidths which are dominated by the

output capacitor and which are limited to

500KHz (see further discussion in the Func-

tional Description section).

architecture also eliminates the output com-

pensation capacitor typical in earlier terminator

designs. Each is approved for use with SCSI-

1, -2, -3, UltraSCSI and beyond — providing

the highest performance alternative available

today.

erant of marginal system integrations. A key

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

5/99

Linfinity's UltraMAX architecture employs

The LX5225 architecture is much more tol-

N F I N I T E

E C E I V I N G

11861 W

O W E R

DISC 2

DISC 1

ESTERN

The UltraMAX

AV E F O R M

D E S C R I P T I O N

O F

I N

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

VENUE

Append the letter "T" to part number. (i.e. LX5225CDWPT)

LX5225

N N O V A T I O N

PnP

I N I T Y

- 2 0 M H

, G

improvement offered by the LX5225 lies in its

ability to ensure reliable, error-free communi-

cations even in systems which do not adhere

to recommended SCSI hardware design guide-

lines, such as the use of improper cable lengths

and impedances. Frequently, this situation is

not controlled by the peripheral or host de-

signer and, when problems occur, they are the

first to be made aware of the problem.

nect pins must be driven low thereby discon-

necting the LX5225 from the SCSI bus. The

LX5225 has two disconnect pins for SCSI Plug

and Play (PnP) applications. Quiescent current

is less than 150µA in this mode.

in the LX5225 architecture. Traditional termi-

nation techniques require large stabilization

and transient protection capacitors of up to

20µF in value and size. The LX5225 architec-

ture does not require these components, al-

lowing all the cost savings associated with

inventory, board space, assembly, reliability,

and component costs.

ment for the LX5205 and the UCC5607.

ARDEN

Receiver

PA C K A G E O R D E R I N F O

To enter the disconnect mode, the discon-

Reduced component counts is also inherent

The LX5225 is a superior pin-for-pin replace-

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

0 to 70

(°C)

LX5268

ROVE

1 Meter, AWG 28

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

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

DWP

LX5225CDWP

UltraMAX

Plastic SOWB

28-pin, Power

LT R A

LX5268

18-L

Driver

R O D U C T I O N

R I V I N G

I N E

LX5225

PnP

, P

L U G A N D

N C

AV E F O R M

: 714-893-2570

SCSI Plug And Play, Dual Low Disconnect,

Logic Low Command Disconnects All

Termination Lines

Ultra-Fast Response For Fast-20 SCSI

Applications

35MHz Channel Bandwidth

Sleep-Mode Current Less Than 150µA

NO External Compensation Capacitors

Compatible With Active Negation Drivers

Compatible With Passive And Active

Terminations

Approved For Use With SCSI 1, 2, 3 And

Ultra SCSI

Hot Swap Compatible

Pin-For-Pin Compatible With LX5205 And

UC5607

DISC 1

DISC 2

K E Y F E A T U R E S

- 2 0 M H

Discussion On Applying

L AY

Single-Ended SCSI Bus"

A T A

SCSI, Request Linfinity

"Understanding The

Application Note:

For An In-Depth

SCSI T

LIN D

NOTE:

LX5225

H E E T

E R M I N AT O R

O C

#: 5225

Related parts for lx5225

lx5225 Summary of contents

Page 1

... LX5268 Plastic SOWB DWP T (°C) A 28-pin, Power LX5225CDWP Append the letter "T" to part number. (i.e. LX5225CDWPT CA. 92841, 714-898-8121, F VENUE ARDEN ROVE ...

... TERM DWP PACKAGE (Top View) (Note 2) Recommended Operating Conditions Min. Typ. Max. 4.0 5 TERM 0 125 LX5225 Min. Typ. Max. 2.65 2.85 10 424 450 50 150 -20 -22 -24 - DISC2 T18 T17 T16 T15 T14 HEAT SINK/GND HEAT SINK/GND HEAT SINK/GND ...

Page 3

... FIGURE 1 — LX5225 BLOCK DIAGRAM TERM POWER CURRENT BIASING CIRCUIT FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION ...

Page 4

... Enabled L L Disabled Open Disabled power conservation or to completely eliminate the terminator from the SCSI chain. An additional feature of the LX5225 is its compatibility with active negation drivers. UltraMAX is a trademark of Linfinity Microelectronics Inc. UltraMAX deassertion. In order to ...

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lx5225 Microsemi Corporation, lx5225 Datasheet

lx5225

Related parts for lx5225

lx5225 Summary of contents

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