Datasheet LX5115CPWP, LX5115CDW, LX5115CD Datasheet (Microsemi Corporation)

LIN DOC #:

5115

UltraMAX

ULTRA 9-CHANNEL SCSI TERMINATOR

T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION KEY FEATURES

The LX5115 SCSI terminator is part of Linfinity's
UltraMAX family of high-performance, adaptive,
non-linear mode SCSI products, which are de­signed to deliver true UltraSCSI performance in
SCSI applications. The low voltage BiCMOS ar­chitecture employed in its design offers superior
performance to older linear passive and active
techniques. Linfinity's UltraMAX architecture
employs high-speed adaptive elements for each
channel, thereby providing the fastest response
possible — typically 35MHz, which is 100 times
faster than the older linear regulator/terminator
approach used by other manufacturers. 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). The UltraMAX architecture also eliminates
the output compensation capacitor typical in earlier
terminator designs. Each is approved for use with
SCSI-1, -2, -3, UltraSCSI and beyond — providing
the highest performance alternative available to­day.

Another key improvement offered by the
LX5115 lies in its ability to insure reliable, error­free communications even in systems which do
not adhere to recommended SCSI hardware design
guidelines, such as the use of improper cable

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

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 the problem. The LX5115
architecture is much more tolerant of marginal
system integrations.

Recognizing the needs of portable and
configurable peripherals, the LX5115 has a TTL
compatible sleep/disable mode. Quiescent
current is typically 150µA in this mode, while the
output capacitance is also less than 3pF. The
obvious advantage of extended battery life for
portable systems is inherent in the product's sleep­mode feature. Additionally, the disable function
permits factory-floor or production-line
configurability, reducing inventory and product­line diversity costs. Field configurability can also
be accomplished without physically removing
components which, often times results in field
returns due to mishandling.

Reduced component counts is also inherent in
the LX5115 architecture. Traditional termination
techniques require large stabilization and transient
protection capacitors of up to 20µF in value and
size. The LX5115 architecture does not require
these components, allowing all the cost savings
associated with inventory, board space, assembly,
reliability, and component costs.

P RODUCTION DAT A SHEET

TM

LX5115

■ ULTRA-FAST RESPONSE FOR FAST-20

SCSI APPLICATIONS

■ 35MHz CHANNEL BANDWIDTH

■ LESS THAN 3pF OUTPUT CAPACITANCE

■ SLEEP-MODE CURRENT OF 150µA

■ NO EXTERNAL COMPENSATION

CAPACITORS

■ IMPLEMENTS 8-BIT OR 16-BIT (

APPLICATIONS

■ COMPATIBLE WITH ACTIVE NEGATION

DRIVERS (37mA / CHANNEL)

■ 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

DS21S07A / 2105

WIDE

)

PRODUCT HIGHLIGHT

DRIVING WAVEFORM - 20MHZRECEIVING WAVEFORM - 20MHZ

Receiver

1 Meter, AWG 28

LX5115 LX5115

LX5268 LX5268

PACKAGE ORDER INFORMATION

T

(°C)

J

Plastic SOIC

D

16-pin

Plastic SOWB

DW

16-pin

0 to 70 LX5115CD LX5115CDW LX5115CPWP

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

Append the letter "T" to part number. (i.e. LX5115CDWT)

Driver

PWP

Plastic TSSOP
20-pin, Power

NOTE:

For An In-Depth

Discussion On Applying

SCSI, Request Linfinity

Application Note:

"Understanding The Single-

Ended SCSI Bus"

Copyright © 1997
Rev. 1.1 12/97

L INF INITY MICROELECTRONICS INC.

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

1

PRODUCT DATABOOK 1996/1997

LX5115

ULTRA 9-CHANNEL SCSI TERMINATOR

RODUCTION DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

Continuous Termination Voltage .......................................................................... 10V

Continuous Output Voltage Range .............................................................. 0 to 5.5V

Continuous Disable Voltage Range .............................................................. 0 to 5.5V

Operating Junction Temperature ........................................................... 0°C to 125°C

Storage Temperature Range ............................................................. -65°C to +150°C

Solder Temperature (Soldering, 10 seconds) ................................................... 300°C

Note 1. Exceeding these ratings could cause damage to the device.

THERMAL DATA

D PACKAGE:

D

x θ

θθ

θ

θθ

JA

θθ

θ

θθ

JA

θθ

θ

θθ

JA

).

JA

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

DW PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

PWP PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

Junction Temperature Calculation: TJ = TA + (P
The θ

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

JA

All of the above assume no ambient airflow.

120°C/W

95°C/W

139°C/W

UltraMAX

PACKAGE PIN OUTS

TERM POWER

N.C.

GND

TERM POWER

N.C.

GND

D0

215

D1

314

D2

413

D3

512

D4

611

710

89

D PACKAGE

(Top View)

1 16

215

D0

314

D1

413

D2

512

D3

611

D4

710

89

DW PACKAGE

(Top View)

DISABLE

16

N.C.
D8
D7
D6
D5
N.C.
N.C.

DISABLE
N.C.
N.C.
D8
D7
D6
D5
N.C.

TERM POWER

HEATSINK/GND

HEATSINK/GND

N.C.

GND

219

318

D0

417

D1

516

D2

615

D3

714

D4

813

912
10 11

PWP PACKAGE

(Top View)

20

DISABLE
N.C.
HEATSINK/GND
N.C.
D8
D7
D6
D5
HEATSINK/GND
N.C.

2

Copyright © 1997

Rev. 1.1 12/97

PRODUCT DATABOOK 1996/1997

UltraMAX

LX5115

ULTRA 9-CHANNEL SCSI TERMINATOR

P RODUCTION DAT A SHEET

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

Termination Voltage V
High Level Enable Input Voltage V

Low Level Disable Input Voltage V

Operating Virtual Junction Temperature Range

LX5115C

Note 2. Range over which the device is functional.

Symbol

TERM

IH

IL

ELECTRICAL CHARACTERISTICS

Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient tempera­ture of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.

Parameter

Output High Voltage V
TermPwr Supply Current I

Output Current I

Disable Input Current I

Output Leakage Current I
Capacitance in Disabled Mode C
Channel Bandwidth BW

Termination Sink Current, per Channel I

Symbol

OUT

CC

OUTVOUT

IN

OL

OUTVOUT

SINKVOUT

Test Conditions Units

All data lines = open

All data lines = 0.5V
Disable Pin < 0.8V

= 0.5V

Disable Pin = 4.75V
Disable Pin = 0V

Disable Pin = < 0.8V, VO = 0.5V

= 0V, frequency = 1MHz

= 4V

Recommended Operating Conditions

Min. Typ. Max.

4.0 5.5 V
2V

0 0.8 V

0 125 °C

TERM

LX5115

Min. Typ. Max.

2.65 2.85 V

5.5 9 mA

210 225 mA
150 µA

-21 -23 -24 mA

10 nA

-15 µA

20 nA

3pF

35 MHz
37 mA

Units

V

Copyright © 1997
Rev. 1.1 12/97

3

PRODUCT DATABOOK 1996/1997

T

LX5115

DISABLE

PIN

1.4V

TERM POWER

THERMAL
LIMITING

ULTRA 9-CHANNEL SCSI TERMINATOR

RODUCTION DATA SHEET

P

BLOCK DIAGRAM

CURRENT

BIASING

CIRCUIT

CIRCUIT

24mA CURRENT

LIMITING CIRCUIT

2.85V

UltraMAX

DATA OUTPU
PIN DB(0)

1 OF 9 CHANNELS

FUNCTIONAL DESCRIPTION

Cable transmission theory suggests to optimize signal speed
and quality, the termination should act both as an ideal voltage
reference when the line is released (deasserted) and as an
ideal current source when the line is active (asserted). Common
active terminators, which consist of
Linear Regulators in series with resis-

tors (typically 110Ω), are a compro-

mise. As the line voltage increases,
the amount of current decreases lin-

POWER UP / POWER DOWN FUNCTION TABLE

Disable
LX5115 Current

Outputs

early by the equation V = I * R. The
LX5115, with its unique new architec­ture applies the maximum amount of
current regardless of line voltage until

H Enabled 5.5mA

L HI Z 150µA

Open Enabled 5.5mA

the termination high threshold (2.85V)
is reached.

Acting as a near ideal line terminator, the LX5115 closely
reproduces the optimum case when the device is enabled.
To enable the device the Disable Pin must be pulled Logic
High or left open. During this mode of operation, quiescent
current is 5.5mA and the device will respond to line demands

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.

UltraMAX is a trademark of Linfinity Microelectronics Inc.

by delivering 24mA on assertion and by imposing 2.85V on
deassertion. In order to disable the device, the Disable pin
must be driven logic Low. This mode of operation places
the device in a sleep state where a meager 150µA of quiescent

current is consumed. Additionally, all
outputs are in a Hi-Z (impedance)
state. Sleep mode can be used for

Quiescent

power conservation or to completely
eliminate the terminator from the SCSI
chain. In the second case, termination
node capacitance is important to
consider. The terminator will appear
as a parasitic distributed capacitance
on the line, which can detract from bus

performance. For this reason, the
LX5115 has been optimized to have only 3pF of capacitance
per output in the sleep state.

An additional feature of the LX5115 is its compatibility with
active negation drivers. The device handles up to 37mA of
sink current for drivers which exceed the 2.85V output high.

4

Copyright © 1997

Rev. 1.1 12/97