Datasheet LX5203CN, LX5203CDP Datasheet (Microsemi Corporation)

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LX5203

9-LINE SCSI ACTIVE TERMINATOR

5203

THE INFINITE POWER OF INNOVATION

DESCRIPTION KEY FEATURES

The LX5203 is a nine-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 LX5203 re­quires a meager 60µA of supply current,
while offering only 6pF 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 LX5203 con-

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

sumes only 600µA of current. Linfinity's
proprietary BiCMOS low dropout regulator
architecture enables oscillation-free opera­tion with minimal output capacitance.
Linfinity recommends a minimum stabiliza­tion capacitor value of 2.2µF.

The LX5203 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 LX5203 sinks
up to 150mA of current making it compatible
with today's fast active negation drivers.

The LX5203 is a superior, pin-for-pin re­placement for a variety of industry products
such as the UC5603 and UC5613.

PRODUCT HIGHLIGHT

P RODUCTION DAT A SHEET

■ 6pF OUTPUT CAPACITANCE DURING

DISCONNECT

■ 60µA SUPPLY CURRENT IN DISCON-

NECT MODE

■ 600µA SUPPLY CURRENT DURING

NORMAL OPERATION

■ 150mA 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: 5203TR

RECEIVING WAVEFORM - 5MHZ DRIVING WAVEFORM - 5MHZ

Receiver

1 Meter, AWG 28

LX5203 LX5203

LX5268 LX5268

PACKAGE ORDER INFORMATION

(°C)

T

A

0 to 70 LX5203CN LX5203CDP

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

Append the letter "T" to part number. (i.e. LX5203CDPT)

Plastic DIP

N

16-pin

Driver

Plastic SOIC

DP

16-pin, Power

NOTE:

For An In-Depth

Discussion On Applying

SCSI, Request Linfinity

Application Note:

"Understanding The

Single-Ended SCSI Bus"

Copyright © 1997
Rev. 1.9 7/97

L INFINITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]

1

LX5203

PRODUCT DATABOOK 1996/1997

9-LINE SCSI ACTIVE TERMINATOR

P RODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

TermPwr Voltage ......................................................................................................... +7V

Signal Line Voltage ............................................................................................ 0V to +7V

Regulator Output Current ........................................................................................... 0.4A

Operating Junction Temperature

Plastic (N, DP Packages)....................................................................................... 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

N PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θ

θθ

JA

65°C/W

DP 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

20°C/W

45°C/W

POWER UP / POWER DOWN FUNCTION TABLE

Disconnect Outputs

L Enabled 600µA

H HI Z 60µA

Open HI Z 60µA

Quiescent

Current

PACKAGE PIN OUTS

1 16

T7

215

T8

314

T9

413

N.C.

512

GND

DISCONNECT

HEATSINK/GND

GND

DISCONNECT

611

710

T1

89

T2

N PACKAGE

(Top View)

T7
T8

215

T9

314

413

512

611

T1

710

T2

89

DP PACKAGE

(Top View)

16

T6
T5
REG OUT
N.C.
N.C.
V

TERM

T4
T3

T6
T5
REG OUT
HEATSINK/GND
HEATSINK/GND
V

TERM

T4
T3

2

Copyright © 1997

Rev. 1.9 7/97

PRODUCT DATABOOK 1996/1997

LX5203

9-LINE SCSI ACTIVE TERMINATOR

P RODUCTION DATA SHEET

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

TermPwr Voltage V

Symbol

TERM

Signal Line Voltage

Disconnect Input Voltage

Output Capacitor on REGOUT
Operating Virtual Junction Temperature Range

LX5203C

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, TA = 25°C

TERM

= -5mA to -15mA

I

TERM

= 0.5V, TA = 25°C

OUT

V

= 0.5V, 0°C ≤ TA ≤ 70°C

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

TERM

= 0V to 5.25V

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 -50mA

REG

= -50mA

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

2.2 µF

0 125 °C

LX5203

Min. Typ. Max.

0.6 1.2 mA

194 208 mA

60 100 µA

104 110 116 Ω
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

6pF

20 30 mA

3.6 V
10 20 mV
20 50 mV

0.7 1.0 V

-200 -350 mA

150 °C

0.8 2.0 V
40 µA

Copyright © 1997
Rev. 1.9 7/97

3

LX5203

DISCONNECT

PRODUCT DATABOOK 1996/1997

9-LINE SCSI ACTIVE TERMINATOR

P RODUCTION DATA SHEET

BLOCK DIAGRAM

FIGURE 1 — LX5203 BLOCK DIAGRAM

REG OUT

V

TERM

V

TERM

Channel
1 of 9

5V

2.2µF

DISCONNECT

2.2µF

TERM POWER

V

TERM

LX5203

REGOUT

VBG

~

DB (0)

~

DB (1)

~

DB (6)

~

DB (7)

~

DB (P)

APPLICATION SCHEMATIC

FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION

HOST

PERIPHERAL

DB (0)
DB (1)

DB (6)
DB (7)
DB (P)

V

TERM

TERM POWER

V

TERM

LX5203

REGOUT

T0

T8

5V

2.2µF

2.2µF

DISCONNECTDISCONNECT

TERMPWR

DISCONNECT

2.2µF

Note: Add third LX5203 for 16-bit SCSI

4

V

TERM

LX5203

REGOUT

~

ATN

~

BSY

~

ACK

~

RST

~

MSG

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

ATN

BSY

ACK

RST

MSG

V

LX5203

REGOUT

TERM

TERMPWR

2.2µF

Copyright © 1997

Rev. 1.9 7/97