LX5250_技术文档

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

KEY FEATURES

DESCRIPTION

Compliant with SCSI SPI-2

(Ultra2), SPI-3 (Ultra160), and

SPI-4 (Ultra320)

Auto-Selectable LVD or Single-

Ended Termination

Fast Response, No Output

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)

Available in 36-pin QSOP and 28-

pin TSSOP package

LX5250, 36-pin QSOP: Pin

Compatible With DS2118,

UCC5630A and UCC5672

LX5250 28-pin TSSOP: Pin

Compatible with DS2119, and

UCC5672

The LX5250/52 is a multimode SCSI 1.4V. In application this pin is tied to the

terminator that is compatible with the DIFFSENSE input of the corresponding LVD

SCSI SPI-2 (Ultra2 SCSI), SCSI SPI-3 transceivers. This action enables the LVD

(Ultra3 SCSI or Ultra160 SCSI), and transceiver function. DIFFSENSE is capable of

SCSI SPI-4 (Ultra320) specifications supplying a maximum of 10mA.

developed by the T10 standards

committee for low voltage differential

(LVD) termination, while providing

backwards compatibility to the SCSI,

Tying the DIFFSENSE pin high places the

LX5250/52 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.

Recognizing the needs of portable and

configurable peripherals, the LX5250/52 has a

TTL compatible sleep/disable mode. During

this sleep/disable mode, power dissipation is

reduced to a meager 15uA while also placing

all outputs in a HI Z state. Also during

sleep/disable mode, the DIFFSENSE function

is disabled and is placed in a HI Z state.

The LX5250/52 also provides a 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.

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 LX5250/52 utilizes an industry

standard

LVD

architecture.

The

individual high bandwidth drivers

maximize channel separation, reduce

channel-to-channel noise and cross talk

to insure Ultra320 performance.

When the LX5250/52 is enabled, the

differential sense (DIFFSENSE) pin

supplies a voltage between 1.2V and

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

PRODUCT HIGHLIGHT

-

LX5250/

LX5252

LX5250/

LX5252

+

PACKAGE ORDER INFO

QSOP

36-Pin

TSSOP

28-Pin

RoHS Compliant / Pb-free

Transition DC: 0518

DB

PW

T_A(°C)

RoHS Compliant / Pb-free

Transition DC: 0535

LX5250CDB

LX5252CDB

LX5250CPW

-

0 to 70

Note: Available in Tape & Reel.

Append the letters “TR” to the part number. (i.e. LX5250CDB-TR)

Rev. 1.2b, 2005-08-29

Microsemi

Page 1

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS

PACKAGE PIN OUT

Term Power (V_TERM).........................................................................................-0.3V to 7V

Operating Junction Temperature ................................................................................150°C

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

RoHS / Pb-free Peak Package Solder Reflow Temperature

1

2

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

NC

V_TERM

HVD

NC

1+

1-

3

LVD

SE

9-

4

5

6

2+

9+

(40 second maximum exposure)................................................................... 260°C (+0, -5)

7

2-

8-

8+

8

HEATSINK

9

HEATSINK

7-

7+

6-

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

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

10

11

12

13

14

3+

3-

4+

4-

15

16

17

18

5+

5-

6+

DIFFB

DIFFSENSE

M/Sb

DISCONNECT

THERMAL DATA

GND

LX5250/5252

36 Pin QSOP

DB

DB PACKAGE

(Top View)

53.9°C/W

100°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ_JA

N/C = Not internally connected

28 Pin TSSOP

PW

V_TERM

NC

1

2

28

27

26

25

24

23

22

21

20

19

18

17

16

15

NC

1+

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ_JA

9-

9+

8-

3

1-

2+

2-

4

5

8+

6

NC

Junction Temperature Calculation: T_J= T_A+ (P_Dx θ_JA).

NC

7-

7+

6-

7

3+

3-

4+

4-

5+

5-

8

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

system. All of the above assume no ambient airflow. θ_JAcan vary significantly

depending on mounting technique. (See Application Notes Section: Thermal

considerations)

9

10

11

12

13

14

6+

DIFFB

DIFFSENSE

M/Sb

DISCONNECT

GND

MASTER/SLAVE FUNCTION TABLE

LX5250 ONLY

PW PACKAGE

(Top View)

Master/Slave

DIFFSENSE Status

N/C = Not internally connected

RoHS / Pb-free 100% Matte Tin Lead Finish

L*

HI Z

1.3V

0mA

H

10mA Source

Open (Pull-Up)

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

DIFFSENSE/POWER UP/POWER DOWN FUNCTION TABLE

Outputs

LX5252

LX5250

DISCONNECT

Quiescent

Current

DIFFSENSE

DISCONNECT

Status

Type

L

H

< 0.5V

0.7V – 1.9V

> 2.4V

Enable

Disable

SE

55mA

35mA

8mA

L

H

LVD

HI-Z

H or Open

L or Open

X

10µA

Rev. 1.2b, 2005-08-29

Microsemi

Page 2

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

RECOMMENDED MAX OPERATING CONDITIONS

LX5250/52

Typ

Parameter

Symbol

Units

Min

Max

LVD

SE

2.9

3.5

5.25

VTerm

V_TERM

V

Signal Line Voltage

0

5.0

V_TERM

125

V

Disconnect Input Voltage

Operating Junction Temperature

T_J

°C

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ T_A≤ 70°C, VTerm = 4.75V.

For the LX5250, DISCONNECT = L; for the LX5252, DISCONNECT = H.

LX5250/52

Min Typ Max

Parameter

Symbol

Test Conditions

Units

LVD Terminator Section

`

All term lines open

35

15

45

35

mA

µA

LX5250: DISCONNECT > 2.0V;

LX5252: DISCONNECT < 0.8V

VTerm Supply Current

LVD_ICC

Common Mode Voltage

Offset Voltage

V_CM

V_OS

Z_O

1.125 1.25 1.375

V

mV

Ω

Open circuit between (-) and (+) terminals

V_OUTDifferential = -1V to +1V

100

110

112

105

150

125

110

195

Differential Terminator Impedance

Common Mode Impedance

Z_CM

0.5V to 2V

Ω

LX5250: DISCONNECT > 2.0V;

LX5252: DISCONNECT < 0.8V

Output Capacitance (Note 1)

C_O

t_DF

3

pF

Mode Change Delay

Diffsense = 1.4V to 0V

100

115

1.3

300

ms

Diffsense Section

`

Diffsense Output Voltage

Diffsense Output Source Current

Diffsense Sink Current

Single Ended Section

V_DIFF

I_DIFF

1.2

5

1.4

15

V

V_DIFF= 0V

mA

µA

I_SINK(DIFF)V_DIFF= 2.75V

20

200

All tem lines = Open, Master/Slave = 0V

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

LX5250: DISCONNECT > 2.0V;

55

250

75

290

mA

VTerm Supply Current

SE_ICC

15

35

µA

LX5252: DISCONNECT < 0.8V

Termination Output High Voltage

Output Current

V_O

I_O

2.5

2.85

3.1

24

V

V_OUT= 0.2V

18.5 22.5

40 65

mA

pF

Sink Current

I_SINK

C_O

V_OUT= 4V, All lines

Output Capacitance (Note 1)

DISC > 2.0V

3

2

LX5250: DISCONNECT > 2.0V;

LX5252: DISCONNECT < 0.8V,

I_DDQ

µA

V

_LINE= 0 to 4V, T_A= 25°

Output Leakage

LX5250: DISCONNECT > 2.0V;

LX5252: DISCONNECT < 0.8V,

V

I_HP

Z_G

1

µA

_TERM= Open, V_LINE= 2.7V, T_A= 25°

Ground Driver Impedance

I = 1mA

100

Ω

Rev. 1.2b, 2005-08-29

Microsemi

Page 3

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ T_A≤ 70°C, VTerm = 4.75V.

For the LX5250, DISCONNECT = L; for the LX5252, DISCONNECT = H.

LX5250/52

Min Typ Max

Parameter

Symbol

Test Conditions

Units

DISCONNECT Section

`

Disconnect Thresholds

V_TH

I_IL

0.8

2.0

10

V

LX5250: DISCONNECT = 0V;

µA

LX5252: DISCONNECT = 2.4V

LX5250: DISCONNECT = 2.4V;

LX5252: DISCONNECT = 0V

Input Current

I_IH

100

nA

MASTER/SLAVE Section

Master/Slave Thresholds

V_TH(MS)

0.8

2.0

10

V

I_IL(MS)

I_IH(MS)

Master/Slave = 0V

Master/Slave = 2.4V

µA

nA

Input Current

Note 1: Guaranteed by design.

BLOCK DIAGRAM

22.4mA

I-Limited

2.7V

1 of 9

Terminator

Pairs

VTERM

36

Source

1.07 mA

SE

LVD

LVD(-)

/SE

5

4

HVD

52.5

SE

DISC

DISCONNECT

17

LVD

LVD(+)

/SE (Pseudo-GND)

150

HVD

52.5

1.25V

20

10mA

I-Limited

1.3V

1.07 mA

M/S

19

Source

GND

18

POWER

ON

&

MODE

DELAY

SE

HVD

Window

Comp.

DIFSENSE

20

20K

LVD

DISC

DIFFB

21

33

SE

LATCH

35 HVD

34 LVD

Figure 1 – LX5250/52 Block Diagram; 36-pin version shown

Rev. 1.2b, 2005-08-29

Microsemi

Page 4

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

FUNCTIONAL PIN DESCRIPTION

PIN NAME

DESCRIPTION

1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-

Negative signal termination lines for LVD mode. Signal termination lines for SE mode.

Positive signal termination lines for LVD mode. Psuedo-ground lines for SE mode.

1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+

Power supply pin for terminator. Connect to SCSI bus VTERM. Must be

decoupled by one 4.7µF low-ESR capacitor for every three terminator devices. It is

absolutely necessary to connect this pin to the decoupling capacitor through a very low

impedance (big traces to PCB). Keeping distances very short from the decoupling

capacitors is somewhat layout dependent and some applications may benefit from high

frequency decoupling with 0.1µF capacitors at V_TERMpin.

V_TERM

Enables/Disables terminator. See Power Down Function Table for logic levels

for LX5250 and LX5252.

DISCONNECT

GND

Terminator ground pin. Connect to ground.

Sometimes referred to as M/S pin in this datasheet. Used to select which terminator is the

controlling device. M/S pin High or Open enables the DIFFSENSE output drive. Please

see MASTER/SLAVE Function Table.

MASTER/SLAVE

This is a dual function pin. It drives the SCSI bus DIFFSENS line. It is also the sense pin

to detect the SCSI bus mode (LVD, SE, or HVD). DIFFSENSE output drive can be

disabled with low level on the M/S pin. Please see DIFFSENSE and MASTER/SLAVE

Function Tables. Internally connected to DIFFB pin through a 20K Ω resistor.

DIFFSENSE

Internally connected to DIFFSENSE pin through a 20K Ω resistor. It can be used as a

mode sense pin when the device is non-controlling terminator (M/S is low). An RC filter

(50K Ω resistor & 4.7µF) is not required on the LX5250 as it has an internal timer.

DIFFB

SE

Single-Ended output; when High, terminator is operating in SE mode.

LVD

Low Voltage Differential output; when High, terminator is operating in LVD mode.

High Voltage Differential output; when High, terminator is operating in HVD mode.

HVD

Attached to die mounting pad, but not bonded to GND pin. Pins should be considered a

heat sink only, and not a true ground connection. It is recommended that these pins be

connected to ground, but can be left floating.

HEATSINK

Rev. 1.2b, 2005-08-29

Microsemi

Page 5

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

APPLICATION SCHEMATIC

PERIPHERAL

HOST

TERMPOWER

DISCONNECT

TERMPOWER

DISCONNECT

1-

VTERM

1-

VTERM

1+

Data Lines (9)

9-

9+

9-

9+

LX5250/52

DISC

GND

NC*

GND

DIFFSENS

DIFFB

DIFFSENS

DIFFB

NC*

50k

Pin 1

4.7uF

1-

VTERM

1-

VTERM

1+

Data Lines (9)

9-

9+

LX5250/52

DISC

GND

DIFFSENS

DIFFB

NC*

Pin 1

4.7uF

1-

VTERM

1-

VTERM

1+

Control Lines (9)

9-

9+

LX5250/52

DISC

GND

NC*

DIFFSENS

DIFFB

DIFFSENS

DIFFB

NC*

Pin 1

4.7uF

*The capacitor on pin 1 can be placed on the LX5250CDB, LX5250CPW, or LX5252CDB to be pin-compatible with other devices, but is not required.

Figure 2 – Application Diagram

Rev. 1.2b, 2005-08-29

Microsemi

Integrated Products Division

Page 6

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

MECHANICAL DRAWINGS

36-Pin Quarter Size Outline Package (QSOP)

DB

MILLIMETERS

INCHES

Dim

MIN

2.14

0.29

0.23

15.20

7.40

MAX

2.54

0.51

0.32

15.40

7.60

MIN

0.084

0.011

MAX

0.100

0.020

36

19

A

B

C

D

E

0.009 0.0125

E P

0.598

0.291

0.606

0.299

F

0.80 BSC

0.031 BSC

1

18

G

H

L

M

P

*LC

0.10

2.44

0.51

0°

0.30

2.64

1.01

8°

10.51

0.10

0.004

0.096

0.020

0°

0.012

0.104

0.040

8°

0.004

B

F

D

E

A

H

M

C

10.11

0.398

G

L

−

*Lead Coplanarity

28-Pin Thin Small Shrink Outline (TSSOP)

PW

MILLIMETERS

INCHES

Dim

MIN

0.85

0.19

0.09

9.60

4.30

MAX

MIN

MAX

A

B

C

D

E

0.95

0.30

0.20

9.80

4.50

0.033

0.007

0.003

0.378

0.169

0.037

0.012

0.008

0.390

.176

3 2 1

P

E

F

G

H

L

M

P

0.65 BSC

0.025 BSC

F

0.05

–

0.50

0.15

1.10

0.75

8°

0.002

–

0.020

0.005

0.043

0.030

8°

D

A

H

0°

L

SEATING PLANE

B

C

G

6.25

–

6.50

0.10

0.246

–

0.256

0.004

M

*LC

Note:

1. Dimensions do not include mold flash or protrusions;

these shall not exceed 0.155mm(.006”) on any side.

Lead dimension shall not include solder coverage.

Rev. 1.2b, 2005-08-29

Microsemi

Page 7

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX5250/5252

®

9-Line Multimode SCSI Terminator

TM

PRODUCTION DATA SHEET

NOTES

PRODUCTION DATA – Information contained in this document is proprietary to

Microsemi and is current as of publication date. This document may not be modified in

any way without the express written consent of Microsemi. Product processing does not

necessarily include testing of all parameters. Microsemi reserves the right to change the

configuration and performance of the product and to discontinue product at any time.

Rev. 1.2b, 2005-08-29

Microsemi

Integrated Products Division

Page 8

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570


型号：	LX5250
厂家：	Microsemi
描述：	9-Line Multimode SCSI Terminator 9线多模SCSI终结者
文件：	总8页 (文件大小：188K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LX5250 [MICROSEMI]

相关型号：

LX5250CDB

LX5250CDB-TR

LX5250CDBT

LX5250CPW

LX5251

LX5251CPW

LX5251CPW-TR

LX5251CPWT

LX5252CDB

LX5252CDBT

LX5255

LX5255CPW