Datasheet LX5208CDWP Datasheet (Microsemi Corporation)

LIN DOC #:

LX5208

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

5208

THE INFINITE POWER OF INNOVATION

DESCRIPTION KEY FEATURES

The LX5208 is an eighteen-line active termi­nator for the SCSI parallel bus. This SCSI
standard recommends active termination at
both ends of the SCSI bus.

During disconnect mode, the LX5208 re­quires a meager 60µA of supply current while
offering only 3.5pF of output capacitance.
To enter this low-power mode, the discon­nect pin can be left open (floating) or driven
high, 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 yield subsequent reliable, error
free communications.

During normal operation, the LX5208 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.

The LX5208 also offers a precisely 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 the LX5208 sinks
up to 200mA of current making it compatible
with today's fast active negation drivers.

The LX5208 is a superior, pin-for-pin re­placement for a variety of industry products
such as the UC5601, UC5602, UC5608, and
UC5609.

PRODUCT HIGHLIGHT

P RODUCTION DATA SHEET

■ 3.5pF OUTPUT CAPACITANCE DURING

DISCONNECT

■ 60µA SUPPLY CURRENT IN DISCON-

NECT MODE

■ 800µA SUPPLY CURRENT DURING

NORMAL OPERATION

■ 200mA SINK CURRENT FOR ACTIVE

NEGATION

■ LOGIC COMMAND DISCONNECTS ALL

TERMINATION LINES

■ CURRENT LIMIT AND THERMAL

PROTECTION

■ COMPATIBLE WITH SCSI 1, 2 AND 3

STANDARDS

■ CONSULT FACTORY FOR APPLICATION

TEST REPORT: 5208TR

RECEIVING WAVEFORM - 10MHZ DRIVING WAVEFORM - 10MHZ

Receiver

Driver

1 Meter, AWG 28

LX5208 LX5208

NOTE:

LX5268 LX5268

For An In-Depth

Discussion On Applying

SCSI, Request Linfinity

PACKAGE ORDER INFO

TA (°C)

0 to 70 LX5208CDWP

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

Append the letter "T" to part number. (i.e. LX5208CDWPT)

Plastic SOWB

DWP

28-pin, Power

Application Note:

"Understanding The

Single-Ended SCSI Bus"

Copyright © 1998
Rev. 1.9 3/98

FOR FURTHER INFORMATION CALL [phone]

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841 1

LX5208

PRODUCT DATABOOK 1996/1997

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

RODUCTION DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

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°C

Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect

to Ground. Currents are positive into, negative out of the specified terminal.

THERMAL DATA

DWP PACKAGE:

D

θθ

θ

θθ

JL

x θ

θθ

θ

θθ

JA

).

JA

THERMAL RESISTANCE-JUNCTION TO LEADS,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

Junction Temperature Calculation: T

numbers are guidelines for the thermal performance of the device/pc-board system.

The θ

JA

All of the above assume no ambient airflow.

= TA + (P

J

18°C/W

40°C/W

POWER UP / POWER DOWN FUNCTION TABLE

Disconnect Outputs

L Enabled 800µA

H HI Z 60µA

Open HI Z 60µA

Quiescent

Current

PACKAGE PIN OUTS

DISCONNECT

HEAT SINK
HEAT SINK
HEAT SINK

V

128

T1

227

T2

326

T3

425

T4

524

T5

623

722

821

920

T6

10 19

T7

11 18

T8

12 17

T9

13 16

14 15

TERM

DWP PACKAGE

(Top View)

GND
T18
T17
T16
T15
T14
HEAT SINK
HEAT SINK
HEAT SINK
T13
T12
T11
T10
REG OUT

2

Copyright © 1998

Rev. 1.9 3/98

PRODUCT DATABOOK 1996/1997

LX5208

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

P RODUCTION DATA SHEET

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

TermPwr Voltage V

Symbol

TERM

Signal Line Voltage

Disconnect Input Voltage

Output Capacitance on REGOUT
Operating Virtual Junction Temperature Range

LX5208C

Note 2. Range over which the device is functional.

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ TA ≤ 70°C. TermPwr = 4.75V, Discon­nect = 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions Units

Supply Current Section

TermPwr Supply Current All term lines = Open

All term lines = 0.5V

Power Down Mode Disconnect = Open

Output Section (Terminator Lines)

Terminator Impedance I

Terminator Output High Voltage
Max. Output Current V

Output Leakage Disconnect = Open, V
Output Capacitance Disconnect = Open

Sink Current V

= -5mA to -15mA

TERM

= 0.5V, TA = 25°C

OUT

= 0.5V, 0°C ≤ TA ≤ 70°C

V

OUT

V

OUT

V

OUT

OUT

= 0.5V, V
= 0.5V, V

= 4V

= 4V, TA = 25°C

TERM

= 4V, 0°C ≤ TA ≤ 70°C

TERM

= 0V to 5.25V

TERM

Regulator Section

Regulator Output Voltage
Line Regulation V

Load Regulation I
Drop Out Voltage I

Short Circuit Current V

= 4V to 6V

TERM

= 0 to -100mA

REG

= -100mA

REG

= 0V

REG

Thermal Shutdown

Disconnect Section

Disconnect Threshold
Input Current Disconnect = 0V

Recommended Operating Conditions

Min. Typ. Max.

Units

4 5.25 V
05V

0V

TERM

V

4.7 µF

070°C

LX5208

Min. Typ. Max.

0.8 1.5 mA

390 430 mA

60 100 µA

100 110 120 Ω

2.7 2.9 V

-20.3 -21.8 -23 mA

-19.0 -21.8 -23 mA

-19.5 -21.8 -23 mA

-18.0 -21.8 -23 mA

10 400 nA

3.5 pF

58 70 mA

3.6 V
10 20 mV

20 50 mV

0.45 1.0 V

-700 -1000 mA
150 °C

0.8 2.0 V
40 µA

Copyright © 1998
Rev. 1.9 3/98

3

LX5208

DISCONNECT

PRODUCT DATABOOK 1996/1997

18-LINE LOW CAPACITANCE, µPOWER SCSI TERMINATOR

RODUCTION DATA SHEET

P

BLOCK DIAGRAM

FIGURE 1 — LX5208 BLOCK DIAGRAM

REG OUT

V

TERM

V

TERM

Channel
1 of 18

5V

4.7µF

DISCONNECT

4.7µF

TERM POWER

V

TERM

LX5208

REGOUT

VBG

Narrow

~

DB (0)

~

DB (1)

~

DB (14)

~

DB (15)

~

DB (P1)

APPLICATION SCHEMATIC

FIGURE 2 — 8/16-BIT SCSI SYSTEM APPLICATION

HOST

PERIPHERAL

Narrow

DB (14)
DB (15)
DB (P1)

DB (0)
DB (1)

V

TERM

TERM POWER

V

LX5208

REGOUT

TERM

T0

T17

4.7µF

4.7µF

5V

DISCONNECTDISCONNECT

V

TERM

TERMPWR

2.2µF

Copyright © 1998

Rev. 1.9 3/98

TERMPWR

DISCONNECT

2.2µF

V

TERM

LX5213

REGOUT

Wide

~

MSG

~

RST

~

ACK

~

BSY

~

ATN

PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.

SCSI CABLE

Wide

MSG

RST

ACK

BSY

ATN

LX5213

REGOUT

4