lx5205 Microsemi Corporation, lx5205 Datasheet

lx5205

Manufacturer Part Number

lx5205

Description

18-line Plug And Play, ??power Scsi Terminator

Manufacturer

Microsemi Corporation

Datasheet

1.LX5205.pdf (4 pages)

Current page: 1 of 4
Download datasheet (104Kb)

Rev. 0.7

H E

The LX5205 is an eighteen line active ter-

minator for the SCSI parallel bus. This SCSI

standard recommends active termination at

both ends of the SCSI bus.

requires a meager 500nA of supply current

while offering only 2.5pF of output capaci-

tance. To enter this low power mode, the

disconnect pins can be left open (floating)

or driven low thereby disconnecting the

terminating resistors and placing the internal

low dropout regulator into low power

mode. In disconnect mode each termination

line presents a high impedance to the SCSI

bus with the overall effect being to preserve

high signal integrity and subsequent reli-

able, error free communications.

LX5205 has two disconnect pins for SCSI

Plug and Play (PnP) applications.

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.

3/98

During disconnect mode, the LX5205

N F I N I T E

E C E I V I N G

Disconnect 1

Disconnect 2

11861 W

O W E R

AV E F O R M

ESTERN

D E S C R I P T I O N

O F

LX5205

I N

PnP

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

VENUE

The

Append the letter "T" to part number. (i.e. LX5205CDWPT)

- 20MH

N N O V A T I O N

I N I T Y

, G

Receiver

consumes only 800µA of current which is

the lowest enabled supply current of any

terminator available on the market today.

Linfinity's proprietary BiCMOS low dropout

regulator architecture enables this unique

and very efficient operating characteristic.

trimmed channel output current specified

to a 5% tolerance. The maximum value of

the output current is trimmed as closely as

possible to the SCSI standard maximum

specification to give the highest possible

noise margin for fast SCSI operation. And

finally, the LX5205 sinks up to 100mA of

current making it compatible with today's

fast active negation drivers.

replacement for the UC5607.

ARDEN

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

During normal operation, the LX5205

The LX5205 also offers a precisely

The LX5205 is a superior, pin-for-pin

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

0 to 70

LX5268

(°C)

1 Meter, AWG 28

ROVE

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

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

DWP

LX5205CDWP

Plastic SOWB

28-pin, Power

18-L

LX5268

INE

Driver

R E L I M I N A R Y

LUG AND

R I V I N G

LX5205

PnP

N C

LAY

AV E F O R M

: 714-893-2570

, µP

SCSI PLUG AND PLAY, DUAL LOW

DISCONNECT, LOGIC LOW COMMAND

DISCONNECTS ALL TERMINATION LINES

2.5pF OUTPUT CAPACITANCE DURING

DISCONNECT

500nA SUPPLY CURRENT IN DISCONNECT

MODE

800µA SUPPLY CURRENT DURING NORMAL

OPERATION

100mA SINK CURRENT FOR ACTIVE

NEGATION

LOGIC COMMAND DISCONNECTS ALL

TERMINATION LINES

CURRENT LIMIT AND THERMAL PROTEC-

TION

COMPATIBLE WITH SCSI 1, 2, 3, AND

FAST-20 STANDARDS

HOT SWAP COMPATIBLE

Discussion On Applying

Single-Ended SCSI Bus"

OWER

K E Y F E A T U R E S

Disconnect 1

Disconnect 2

SCSI, Request Linfinity

"Understanding The

A T A

Application Note:

- 20MH

For An In-Depth

SCSI T

NOTE:

LIN D

LX5205

H E E T

ERMINATOR

O C

#: 5205

Related parts for lx5205

lx5205 Summary of contents

Page 1

... Plastic SOWB T (°C) DWP A 28-pin, Power LX5205CDWP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5205CDWPT CA. 92841, 714-898-8121, F VENUE ARDEN ...

Page 2

... LX5205 18 TermPwr Voltage ................................................................................................. +7V Signal Line Voltage ................................................................................... 0V to +7V Regulator Output Current ................................................................................... 1.2A Operating Junction Temperature Plastic (DWP Package) ................................................................................. 150°C Storage Temperature Range .............................................................. -65°C to 150°C Lead Temperature (Soldering, 10 seconds) .................................................... 300° ...

Page 3

... -100mA REG I = -100mA REG REG Disconnect 1 = Disconnect Disconnect 1 = Disconnect 2 = 2.2V LX5205 ERMINATOR (Note 2) Min. Typ. Max TERM 4.7 0 125 T 70°C. Termpwr = 4.75V, A LX5205 Min. Typ. Max. 0.8 1.5 390 415 0.5 1 100 110 120 2.7 2.9 -20.3 -21.8 -23 -19.0 -21.8 -23 -19.5 -21.8 -23 -18.0 -21.8 -23 10 400 2 ...

Page 4

... LUG AND LAY OWER FIGURE 1 — LX5205 BLOCK DIAGRAM V TERM VBG FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION HOST PERIPHERAL ...

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