Microsemi Corporation LX5226CDWP Datasheet

LIN DOC #:

5226

UltraMAX

U LTRA 18-LINE SCSI TERMINATOR

T HE I NFINITE P OWER OF I NNOVATION

DESCRIPTION

The LX5226 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.

The LX5226 architecture is much more tolerant of marginal system integrations. A

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

key improvement offered by the LX5226 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 pin must be driven high, thereby disconnecting the LX5226 from the SCSI bus. Quiescent current is less than 150µA in this mode.

Reduced component counts is also inherent in the LX5226 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20µF in value and size. The LX5226 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs.

The LX5226 is a superior pin-for-pin replacement for the LX5207, the UC5601 / 5602 / 5610 and the UCC5610.

LX5226

P RODUCTION DATA SHEET

KEY FEATURES

■ 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

Terminations

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

Ultra SCSI

■ Hot-Swap Compatible

■ Pin-For-Pin Compatible With LX5207,

UC5601/5602 And UCC5610

DISC

PRODUCT HIGHLIGHT

DRIVING WAVEFORM - 20MHZRECEIVING WAVEFORM - 20MHZ

Receiver

1 Meter, AWG 28

LX5226

LX5268 LX5268

PACKAGE ORDER INFO

(°C)

Plastic SOWB

DWP

28-pin, Power

0 to 70 LX5226CDWP

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

Append the letter "T" to part number. (i.e. LX5226CDWPT)

Driver

LX5226

DISC

NOTE:

For An In-Depth

Discussion On Applying

SCSI, Request Linfinity

Application Note:

"Understanding The

Single-Ended SCSI Bus"

L INF INITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

PRODUCT DATABOOK 1996/1997

LX5226

U LTRA 18-LINE SCSI TERMINATOR

RODUCTION DATA SHEET

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

θθ

x θ

θθ

THERMAL RESISTANCE-JUNCTION TO LEADS,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

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

18°C/W

40°C/W

PACKAGE PIN OUTS

DISC

T1 T2 T3 T4

HEAT SINK/GND

GND

T6 T7 T8 T9

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

GND 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

LX5226C

Note 2. Range over which the device is functional.

Symbol

TERM

Recommended Operating Conditions

Min. Typ. Max.

Units

4.0 5.5 V 05V

TERM

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

OUT

All data lines = open

All data lines = 0.2V

DISC Pin > 2.0V

= 0.2V

DISC Pin = 0V

DISC Pin = > 2.0V, VO = 0.2V

= 4V

OUT

Test Conditions Units

LX5226

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

Rev. 1.0 5/99

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