Microsemi Corporation LX5225CDWP Datasheet

LIN DOC #:

5225

UltraMAX

ULTRA 18-LINE, PLUG AND PLAY SCSI TERMINATOR

T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION

The LX5225 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 SCSI­1, -2, -3, UltraSCSI and beyond — providing
the highest performance alternative available
today.

The LX5225 architecture is much more tol­erant of marginal system integrations. A key

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

improvement offered by the LX5225 lies in its
ability to ensure reliable, error-free communi­cations even in systems which do not adhere
to recommended SCSI hardware design guide­lines, such as the use of improper cable 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.

To enter the disconnect mode, the discon­nect pins must be driven low thereby discon­necting the LX5225 from the SCSI bus. The
LX5225 has two disconnect pins for SCSI Plug
and Play (PnP) applications. Quiescent current
is less than 150µA in this mode.

Reduced component counts is also inherent
in the LX5225 architecture. Traditional termi­nation techniques require large stabilization
and transient protection capacitors of up to
20µF in value and size. The LX5225 architec­ture does not require these components, al­lowing all the cost savings associated with
inventory, board space, assembly, reliability,
and component costs.

The LX5225 is a superior pin-for-pin replace­ment for the LX5205 and the UCC5607.

TM

LX5225

P RODUCTION DATA SHEET

KEY FEATURES

■ SCSI Plug And Play, Dual Low Disconnect,

Logic Low Command Disconnects All
Ter mination Lines

■ Ultra-Fast Response For Fast-20 SCSI

Applications

■ 35MHz Channel Bandwidth

■ Sleep-Mode Current Less Than 150µA

■ NO External Compensation Capacitors

■ Compatible With Active Negation Drivers

■ Compatible With Passive And Active

Ter minations

■ Approved For Use With SCSI 1, 2, 3 And

Ultra SCSI

■ Hot Swap Compatible

■ Pin-For-Pin Compatible With LX5205 And

UC5607

DISC 1

DISC 2

PRODUCT HIGHLIGHT

DRIVING WAVEFORM - 20MHZRECEIVING WAVEFORM - 20MHZ

Receiver

LX5225

1 Meter, AWG 28

PnP

LX5268 LX5268

PACKAGE ORDER INFO

T

(°C)

A

Plastic SOWB

DWP

28-pin, Power

0 to 70 LX5225CDWP

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

Append the letter "T" to part number. (i.e. LX5225CDWPT)

Driver

LX5225

PnP

DISC 1

DISC 2

NOTE:

For An In-Depth

Discussion On Applying

SCSI, Request Linfinity

Application Note:

"Understanding The

Single-Ended SCSI Bus"

Copyright © 1999
Rev. 1.0 5/99

L INF INITY MICROELECTRONICS INC.

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

1

PRODUCT DATABOOK 1996/1997

LX5225

ULTRA 18-LINE, PLUG AND PLAY SCSI TERMINATOR

RODUCTION DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

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

Operating Junction Temperature

Plastic (DWP 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

DWP PACKAGE:

Junction Temperature Calculation: TJ = TA + (P
The θ
system. All of the above assume no ambient airflow.

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

THERMAL DATA

D

θθ

θ

θθ

JL

x θ

θθ

θ

θθ

JA

).

JA

THERMAL RESISTANCE-JUNCTION TO LEADS,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

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

JA

18°C/W

40°C/W

PACKAGE PIN OUTS

DISC1

T1
T2
T3
T4

HEAT SINK/GND

HEAT SINK/GND

T5

GND

T6
T7
T8
T9

V

TERM

DWP PACKAGE

(Top View)

UltraMAX

128

227

326

425

524

623

722

821

920

10 19

11 18

12 17

13 16

14 15

DISC2
T18
T17
T16
T15
T14
HEAT SINK/GND
HEAT SINK/GND
HEAT SINK/GND
T13
T12
T11
T10
N.C.

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

Termpwr Voltage V
Signal Line Voltage

Disconnect Input Voltage

Operating Virtual Junction Temperature Range

LX5225C

Note 2. Range over which the device is functional.

Symbol

TERM

Recommended Operating Conditions

Min. Typ. Max.

Units

4.0 5.5 V
05V

0V

TERM

V

0 125 °C

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

Symbol

Output High Voltage V

TermPwr Supply Current I

Output Current I

OUTVOUT

Disconnect Input Current I

Output Leakage Current I
Channel Bandwidth BW

Termination Sink Current, per Channel I

SINK

Test Conditions Units

OUT

All data lines = open

CC

All data lines = 0.2V

DISC1 and DISC2 Pins < 0.8V

= 0.2V

DISC1 and DISC2 Pins = 0V

IN

DISC1 and DISC2 Pins = < 0.8V, VO = 0.2V

OL

V

= 4V

OUT

LX5225

Min. Typ. Max.

2.65 2.85 V

10 15 mA

424 450 mA

50 150 µ A

-20 -22 -24 mA

-10 µA

1µA

35 MHz

7mA

2

Copyright © 1999

Rev. 1.0 5/99