lx5226 Microsemi Corporation, lx5226 Datasheet

lx5226

Manufacturer Part Number

lx5226

Description

Ultra Line Scsi Terminator

Manufacturer

Microsemi Corporation

Datasheet

1.LX5226.pdf (4 pages)

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Rev. 1.0

H E

The LX5226 SCSI terminator is part of

Linfinity's UltraMAX family of high-perfor-

mance, adaptive, non-linear mode SCSI

products, which are designed to deliver true

UltraSCSI performance in SCSI applications.

The low-voltage BiCMOS architecture em-

ployed in its design offers superior perfor-

mance 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 manu-

facturers. Products 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 Functional Description

section).

eliminates the output compensation capaci-

tor typical in earlier terminator designs. Each

is approved for use with SCSI-1, -2, -3,

UltraSCSI and beyond — providing the high-

est performance alternative available today.

tolerant of marginal system integrations. A

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

5/99

Linfinity's UltraMAX architecture employs

The LX5226 architecture is much more

N F I N I T E

The UltraMAX architecture also

E C E I V I N G

11861 W

O W E R

DISC

ESTERN

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. LX5226CDWPT)

LX5226

N N O V A T I O N

I N I T Y

- 2 0 M H

, G

key improvement offered by the LX5226 lies

in its ability to ensure reliable, error-free

communications even in systems which do

not adhere to recommended SCSI hardware

design guidelines, such as the use of im-

proper cable lengths and impedances. Fre-

quently, this situation is not controlled by

the peripheral or host designer and, when

problems occur, they are the first to be made

aware of the problem.

nect pin must be driven high, thereby dis-

connecting the LX5226 from the SCSI bus.

Quiescent current is less than 150µA in this

mode.

ent in the LX5226 architecture. Traditional

termination techniques require large stabi-

lization and transient protection capacitors

of up to 20µF in value and size. The LX5226

architecture does not require these compo-

nents, allowing all the cost savings associated

with inventory, board space, assembly, re-

liability, and component costs.

placement for the LX5207, the UC5601 / 5602

/ 5610 and the UCC5610.

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 inher-

The LX5226 is a superior pin-for-pin re-

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

LX5226CDWP

UltraMAX

Plastic SOWB

28-pin, Power

LX5268

L T R A

Driver

R O D U C T I O N

R I V I N G

LX5226

1 8 - L

N C

I N E

AV E F O R M

: 714-893-2570

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 LX5207,

UC5601/5602 And UCC5610

DISC

S C S I T

K E Y F E A T U R E S

- 2 0 M H

Discussion On Applying

Single-Ended SCSI Bus"

A T A

SCSI, Request Linfinity

"Understanding The

Application Note:

For An In-Depth

E R M I N A T O R

LIN D

NOTE:

LX5226

H E E T

O C

#: 5226

Related parts for lx5226

lx5226 Summary of contents

Page 1

... LX5226 architecture. Traditional termination techniques require large stabi- lization and transient protection capacitors 20µF in value and size. The LX5226 architecture does not require these compo- nents, allowing all the cost savings associated with inventory, board space, assembly, re- liability, and component costs ...

Page 2

... TERM DWP PACKAGE (Top View) (Note 2) Recommended Operating Conditions Min. Typ. Max. 4.0 5 TERM 0 125 LX5226 Min. Typ. Max. 2.65 2.85 10 424 450 50 150 -20 -22 -24 - GND T18 T17 T16 T15 T14 HEAT SINK/GND HEAT SINK/GND HEAT SINK/GND ...

Page 3

... FIGURE 1 — LX5226 BLOCK DIAGRAM CURRENT BIASING CIRCUIT FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION ...

Page 4

... Common active terminators, which consist of Linear Regulators in series with resistors (typically 110 ), are a compromise. As the line voltage increases, the amount of current decreases linearly by the equation The LX5226, with its unique new architecture, applies the maximum amount of current regardless of line voltage until the termination high threshold (2 ...

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