Datasheet LX5240CPW, LX5240CDB Datasheet (Microsemi Corporation)

LIN DOC #:

5240

UltraMAX

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

THE INFINITE POWER OF INNOVATION

DESCRIPTION KEY FEATURES

The LX5240 is a multimode SCSI terminator with
plug-and-play capability that conforms to the
SCSI Parallel Interconnect-2 (SPI-2) specification
developed by the T10 standards committee for
low voltage differential (LVD) termination, while
providing backwards compatibility to the SCSI,
SCSI-2, and SPI single-ended specifications.
Multimode compatibility permits the use of
legacy devices on the bus without hardware
alterations. Automatic mode selection is
achieved through voltage detection on the
diffsense line.

The LX5240 utilizes Linfinity’s UltraMAX tech­nology which delivers the ultimate in SCSI bus
performance while saving component cost and
board area. Elimination of the external capaci­tors also mitigates the need for a lengthy ca­pacitor selection process. The individual high
bandwidth drivers also maximize channel sepa­ration and reduce channel to channel noise and
cross talk. The high bandwidth architecture
insures ULTRA2 performance while providing
a clear migration path to ULTRA3 and beyond.

When the LX5240 is enabled, the differential
sense (DIFFSENSE) pin supplies a voltage be­tween 1.2V and 1.4V. In application, this pin

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

is tied to the DIFFSENSE input of the corre­sponding LVD transceivers. This action enables
the LVD transceiver function. DIFFSENSE is
capable of supplying a maximum of 15mA.
Tying the DIFFSENSE pin high places the
LX5240 in a HI Z state indicating the presence
of an HVD device. Tying the pin low places
the part in a single-ended mode while also
signaling the multimode transceiver to operate
in a single-ended mode.

The LX5240 supports full Plug and Play
functionality with the DISCONNECT A and B
pins. These logic compatible pins place the
device in operational or sleep modes. During
sleep mode, power dissipation is reduced to
a meager 15µA while also placing all outputs
in a HI Z state. Also during sleep mode, the
DIFFSENSE function is disabled and is placed
in a HI Z state.

Another key feature of the LX5240 is the
master / slave function. Driving this pin high
or floating the pin enables the 1.3V DIFFSENSE
reference. Driving the pin low disables the on
board DIFFSENSE reference and enables use
of an external master reference device.

PRODUCTION DATA SHEET

TM

LX5240

■Auto-Selectable LVD Or

Single-Ended Termination

■3.0pF Maximum Disabled Output

Capacitance

■Fast Response, No External Capacitors

Required

■Compatible With Active Negation

Drivers

■15µA Supply Current In Disconnect

Mode

■Logic Command Disconnects All

Termination Lines

■Diffsense Line Driver

■Ground Driver Integrated For Single-

Ended Operation

■Current Limit And Thermal Protection

■Hot-Swap Compatible

(Single-Ended)

■Compatible With SCSI 1, 2, 3, Fast-20,

And The Pending SPI-2 LVD

■Plug And Play Compatible

■See LX5245/5246, LVD Termination Only

PRODUCT HIGHLIGHT

BUS VOLTAGE V

VOD = V

V

(+)

CM

V

V

(-)

100mV

0V

-100mV

OD

- V

, Logic = 0

(-)

(+)

NEGATED

LX5240 LX5240

PACKAGE ORDER INFO

T

(°C)

A

Plastic SSOP

DB

36-pin

0 to 70 LX5240CDB LX5240CPW

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

Append the letter "T" to part number. (i.e. LX5240CDBT)

Plastic TSSOP

PW

24-pin

Copyright © 1999

Rev. 1.1 10/00

LINFINITY MICROELECTRONICS INC.

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

1

PRODUCT DATABOOK 1996/1997

LX5240

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

RODUCTION DATA SHEET

P

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

Operating Junction Temperature

Plastic (DB, PW 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

DB PACKAGE:

PW 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

x θ

θθ

θ

θθ

JA

θθ

θ

θθ

JA

).

JA

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

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

JA

MASTER / SLAVE FUNCTION TABLE

MASTER / DIFFSENSE Output

SLAVE Status Current

L* HI Z 0mA

H 1.3V 15mA Source

Open (Pull-up) 1.3V 15mA Source

* When in Low state, terminator will detect state of DIFFSENSE line.

50°C/W

100°C/W

PACKAGE PIN OUTS

136

N.C.

235

N.C.

DISCONNECT A

HEATSINK
HEATSINK
HEATSINK

DISCONNECT B

("N.C." = No Internal Connection)

1+

2+

3+

4+

5+

DISCONNECT B

GND

("N.C." = No Internal Connection)

334

433

1+

532

1-

631

2+

730

2-

829

928

10 27

11 26

3+

12 25

3-

13 24

4+

14 23

4-

15 22

5+

16 21

5-

17 20

18 19

GND

DB PACKAGE (Top View)

1 24

223

1-

322

421

2-

520

619

3-

718

817

4-

916
10 15

5-

11 14

12 13

PW PACKAGE (Top View)

UltraMAX

V

TERM

HVD
LVD
SE
9­9+
8­8+
HEATSINK
HEATSINK
HEATSINK
7­7+
6­6+
DIFF B
DIFFSENSE
MASTER/SLAVE

V

TERM

DISCONNECT A
9­9+
8­8+
7­7+
6­6+
DIFFSENSE
MASTER/SLAVE

DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE

DISCONNECT ADISCONNECT B

HL

LH

HL

LH

HL

LH

LL

H H X Disable HI Z 10µA

Open Open

2

DIFF Outputs Quiescent

SENSE Status Type Current

L < 0.5V Enable S.E. 7mA

0.7 to 1.9V Enable LVD 21mA

H > 2.4V Disable HI Z 1mA

Copyright © 1999

Rev. 1.1 10/00

PRODUCT DATABOOK 1996/1997

UltraMAX

LX5240

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

PRODUCTION DATA SHEET

RECOMMENDED OPERATING CONDITIONS (Note 2)

Parameter

Termpwr Voltage LVD V

Symbol

TERM

SE

Signal Line Voltage

Disconnect Input Voltage
Operating Virtual Junction Temperature Range

LX5240C

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 A or B = L. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions Units

LVD Terminator Section

TermPwr Supply Current LVD ICCAll term lines = Open

DISCONNECT A or B = LOW

Common Mode Voltage V
Offset Voltage V
Differential Terminator Impedance ZDV

Common Mode Impedance Z
Output Capacitance C

Output Leakage I

Mode Change Delay t

CM

Open circuit between - and + (see Note 3)

FSB

CM

O

LEAK

Differential = -1V to 1V

OUT

0V to 2.5V
DISCONNECT A or B = LOW

DISCONNECT A or B = LOW, V
DISCONNECT A or B = LOW, V

DIFFSENSE = 1.4V to 0V

DF

LINE

TERM

DIFFSENSE Section

DIFFSENSE Output Voltage V
DIFFSENSE Output Source Current I

DIFFSENSE Sink Current I
DIFFSENSE Output Leakage I

DIFF

DIFFVDIFF

SINK(DIFF)VDIFF

LEAK(DIFF)

= 0V

= 2.75V

DISCONNECT A or B = LOW, TA = 25°C

Single-Ended Termination Section

Termpwr Supply Current SE ICCAll term lines = Open, Master/Slave = 0V

All term lines = 0.2V, Master/Slave = 0V

DISCONNECT A or B = LOW
Terminator Output High Volt V
Output Current I

Sink Current I
Output Capacitance C

Leakage Current I

Ground Driver Impedance ZGI = 1mA

Thermal Shutdown

Note 3. Open circuit failsafe voltage.

O

V

O

SINKVOUT

O

LEAK

= 0.2V

OUT

= 4V, All lines
DISCONNECT A or B = LOW

DISCONNECT A or B = LOW, V
DISCONNECT A or B = LOW, V

OUT

TERM

Recommended Operating Conditions

Min. Typ. Max.

3.0 5.25 V

3.5 5.25 V

0 5.0 V
0V

070°C

Min. Typ. Max.

1.125 1.25 1.375 V
100 112 125 mV

100 105 110 Ω
100 200 300 Ω

= 0 to 4V, TA = 25°C

= 0V, V

= 0 to 4V, TA = 25°C

= 0V, V

LINE

LINE

= 2.7V

= 2.7V

TERM

LX5240

25 30 mA
15 35 µA

2.5 pF

2µA

1µA

115 ms

1.2 1.3 1.4 V

5.0 15.0 mA

200 µA

10 µA

710mA

214 226 mA

15 35 µA

2.6 2.85 V

21 23 24 mA
45 65 mA

2.5 pF

2µA

1µA

100 Ω

150 °C

Units

V

Copyright © 1999

Rev. 1.1 10/00

3

PRODUCT DATABOOK 1996/1997

LX5240

Parameter

DISCONNECT Section (Plug n' Play)

DISCONNECT A/B Thresholds V
Input Current I

MASTER / SLAVE Section

MASTER / SLAVE Thresholds V

Input Current I

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

RODUCTION DATA SHEET

P

ELECTRICAL CHARACTERISTICS

Symbol

TH

DISCONNECT A/B = 0V

IL

I

DISCONNECT A/B = 2.4V

IH

TH (MS)

MASTER / SLAVE = 0V

IL (MS)

I

MASTER / SLAVE = 2.4V

IH (MS)

BLOCK DIAGRAM

Test Conditions Units

DISCONNECT

UltraMAX

LX5240

Min. Typ. Max.

0.8 2.0 V
10 µA

100 nA

0.8 2.0 V

10 µA

100 nA

(-)

R

SE

R

LVD

(+)

R

V

BG

LVD

Ground Driver

FIGURE 1 — LX5240 Block Diagram

4

Copyright © 1999

Rev. 1.1 10/00

PRODUCT DATABOOK 1996/1997

UltraMAX

5V

2.2µF

Plug n' Play

TERMPWR

Plug n' Play

TERM POWER

DIFFSENSE

V

TERM

LX5240

M/S*

DIFFSENSE

V

TERM

LX5240

MULTIMODE, PLUG AND PLAY SCSI TERMINATOR

PRODUCTION DATA SHEET

APPLICATION SCHEMATIC

HOST

DIFFSENSE (1.3V)

~

DB (0) -

~

DB (0) +

~

DB (7)-

~

DB (7)+

DIFFSENSE DIFFSENSE

~

ATN -

~

ATN +

~

ACK -

~

ACK +

SCSI CABLE

PERIPHERAL

TERM POWER

DB (0) -

DB (0) +

DB (7)-

DB (7)+

ATN -

ATN +

ACK -

ACK +

DIFFSENSE

V

LX5240

M/S

DIFFSENSE

V

LX5240

LX5240

TERM

TERM

2.2µF

TERMPWR

5V

Plug n' Play

Plug n' Play

M/S

Note: Single-ended the + signals become ground, DIFFSENSE < 0.5V.

* M/S = MASTER/SLAVE

FIGURE 2 — LX5240 Application Schematic

M/S

Copyright © 1999

Rev. 1.1 10/00

PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.

UltraMAX is a trademark of LinFinity Microelectronics Inc.

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