lx5122 Microsemi Corporation, lx5122 Datasheet

lx5122

Manufacturer Part Number

lx5122

Description

Ultra 27-line, Plug And Play Scsi Terminator

Manufacturer

Microsemi Corporation

Datasheet

1.LX5122.pdf (4 pages)

Current page: 1 of 4
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Rev. 1.0

H E

The LX5122 Plug and Play UltraMAX

minator represents next-generation technol-

ogy for SCSI termination applications. The

low-voltage BiCMOS architecture employed

in its design offers superior performance to

older passive and active techniques.

speed adaptive elements for each channel,

providing the fastest response possible. The

channel bandwidth is typically 35MHz. The

LX5122 compares favorably to older linear

regulator approaches whose bandwidth's

are dominated by the output compensation

capacitor and are limited to the 500KHz

bandwidth region (see further discussion in

the Functional Description section).

Linfinity's architecture also eliminates the

output compensation capacitor typical in

earlier terminator designs. Each is approved

for use with SCSI-1, -2, -3, ULTRA and

beyond — providing the highest perfor-

mance alternative available today.

products lies in their ability to insure re-

liable, error free communications even in

systems which do not necessarily adhere to

recommended SCSI hardware design guide-

lines, such as the use of improper cable

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

Linfinity's architecture employs high-

Another key improvement of LX5122

6/99

N F I N I T E

E C E I V I N G

11861 W

O W E R

ESTERN

AV E F O R M

O F

D E S C R I P T I O N

I N

VENUE

Append the letter "T" to part number. (i.e. LX5122CDBT)

LX5122

ter-

N N O V A T I O N

- 2 0 M H

I N I T Y

, G

ARDEN

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

lengths and impedances. Frequently, this

situation is not controlled by the peripheral

or host designer and, when problems occur,

they are the first to be made aware of these

problems. The LX5122 architecture is much

more tolerant of marginal system integra-

tions.

configurable peripherals, the LX5122 has a

TTL compatible sleep/disable mode. Qui-

escent current is less than 150µA in this

mode.

ent in the LX5122 architecture. Traditional

termination techniques require large stabi-

lization and transient protection capacitors

of up to 20µF in value and size. The LX5122

architecture does not require these com-

ponents, allowing all the cost savings as-

sociated with inventory, board space, as-

sembly, reliability, and component costs.

Plug and Play SCSI capability for Host Bus

Adapters with 3 SCSI connectors. It also

splits the upper 9 termination lines for

mixing 16-bit (wide) and 8-bit (narrow)

b u s e s

capacitance.

Receiver

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

0 to 125

Recognizing the needs of portable and

Reduced component count is also inher-

The LX5122 has multiple disables for full

Note: Available in Tape & Reel.

(°C)

LX5268

ROVE

w i t h

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

m i n i m a l

Plastic SSOP

44-pin

UltraMAX

LX5122CDB

ULTRA 27-L

LX5268

Driver

b o a r d

R O D U C T I O N

R I V I N G

LX5122

I N E

t r a c e

, P

AV E F O R M

N C

LUG A N D

: 714-893-2570

Ultra-Fast Response For Fast-20 SCSI

Applications

Plug and Play SCSI For Host Bus

Adapters With 3 SCSI Connectors

Split Disconnect For Mixing 16-Bit

(Wide) Or 8-Bit (Narrow) Buses

35MHz Channel Bandwidth

Sleep-Mode Current Less Than 150µA

Hot-Swap Compatible

NO External Compensation Capacitors

Compatible With Active Negation

Drivers

Superior Pin-for-Pin Replacement For

The UCC5622

- 2 0 M H

Discussion On Applying

Single-Ended SCSI Bus"

K E Y F E AT U R E S

SCSI, Request Linfinity

A T A

LAY

"Understanding The

Application Note:

For An In-Depth

SCSI T

L I N D

NOTE:

LX5122

H E E T

E R M I N ATOR

O C

# : 5122

Related parts for lx5122

lx5122 Summary of contents

Page 1

... LX5122 architecture. Traditional termination techniques require large stabi- lization and transient protection capacitors 20µF in value and size. The LX5122 architecture does not require these com- ponents, allowing all the cost savings as- sociated with inventory, board space, as- sembly, reliability, and component costs ...

Page 2

... T10 20 25 T21 21 24 T22 PACKAGE (Top View) (Note 2) Recommended Operating Conditions Min. Typ. Max. 4.0 5 TERM 0 0.8 0 125 LX5122 Min. Typ. Max. 2.65 2.85 12 635 670 50 150 -20 -23 -24 -10 - T27 T26 T25 T18 N1 T17 T16 T15 N.C. GND GND ...

Page 3

... CURRENT BIASING CIRCUIT linearly by the equation The UltraMAX LX5122, with its unique new architecture, applies the maximum amount of current regardless of line voltage until the termination high threshold (2.85V) is reached. Acting as a near ideal line terminator, the LX5122 closely reproduces the optimum case when the device is enabled ...

Page 4

... ULTRA 27-L For Plug and Play SCSI auto-termination diabling, connect pin 50 of the External Wide SCSI connector the LX5122, connect pin 50 of the Internal Wide SCSI connector the LX5122, and connect pin 22 of the Internal Narrow connector the LX5122. ...

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