Microsemi Corporation LX5243CPW, LX5243CDB, LX5242CPW, LX5242CDB, LX5241CPW Datasheet

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Microsemi Corporation LX5243CPW, LX5243CDB, LX5242CPW, LX5242CDB, LX5241CPW Datasheet

™ LX5241/5242/5243

T H E I N F I N I T E P O W E R O F I N N O V A T I O N

The LX5241/42/43 is a multimode SCSI terminator that is compatible with to the SCSI SPI02 (Ultra2 SCSI), SCSI SPI-3 (Ultra3 SCSI or Ultra160 SCSI), and pending SCSI SPI-4 (Ultra320) specifications developed by the T10 standards committee for low voltage differential (LVD) termination, while providing backwards compatibility to the SCSI, SCSI-2, and SPI singleended 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 LX5241/42/43 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 LX5241/42/43 is enabled, the differential sense (DIFFSENSE) pin supplies a

voltage between 1.2V and 1.4V. In application this pin 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 LX5241/42/43 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 LX5241/42/43 have 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.

Another key feature of the LX5241/42/43 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.

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

Auto-Selectable LVD or SingleEnded 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 (SingleEnded)

Ultra160 compliant

See LX5245/5246 for LVD Termination Only

Pin Compatible With DS2119 and UCC5630

BUS VOLTAGE 6
V(+)
VCM
V(-)
	-
L X 5 2 4 1	+

VOD

	VOD = V(-) - V(+), Logic = 0
100mV	NEGATED
100mV
0V
-100mV
	-
+	L X 5 2 4 1

Rev. 1.4,2000-11-28


TA (°C)		Plastic TSSOP		Plastic TSSOP		Plastic TSSOP
	DB		PW		PW
		36-Pin		24-Pin		28-Pin

0 to 70	LX5241CDBK		LX5241CPWK		LX5243CPW
	LX5242CDBK		LX5242CPWK		-

Note: Available in Tape & Reel.

Append the letter “T” to the part number. (i.e. LX5241CDBT)

L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .	1

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

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

LX5241/5242/5243		UltraMAX

	M U L T I M O D E S C S I T E R M I N A T O R

	P R O D U C T I O N D A T A S H E E T

	ABSOLUTE MAXIMUM RATINGS	(Note 1)
	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 respect to Ground. Currents are positive into, negative out of the specified terminal.

THERMAL DATA

DB PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA	50°C/W
PW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA	100°C/W

Junction Temperature Calculation: TJ = TA + (PD x θ JA).

The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

MASTER / SLAVE FUNCTION TABLE

MASTER /		DIFFSENSE
SLAVE		Status
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.

DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE

LX5241/5243	LX5242	DIFF	Outputs		Quiescent
DISCONNECT	DISCONNECT	SENSE	Status	Type	Current
L	H	L < 0.5V	Enable	S.E.	7mA

L	H	0.7 - 1.9V	Enable	LVD	21mA

L	H	H > 2.4V	Disable	HI Z	1mA

H	L	X	Disable	HI Z	10µA
Open	Open	X	Disable	HI Z	10µA
Open	Open

PACKAGE PIN OUTS

N.C.	1	36	VTERM

N.C.	2	35	HVD
N.C.	3	34	LVD
1+	4	33	SE

1-	5	32	9-

2+	6	31	9+

2-	7	30	8-

HEATSINK	8	29	8+
HEATSINK	9	28	HEATSINK
HEATSINK	106	27	HEATSINK
3+	116	26	HEATSINK

3-	126	25	7-
4+	136	24	7+

4-	146	23	6-

5+	156	22	6+

5-	16	21	DIFF B

DISCONNECT	176	20	DIFFSENSE


GND	186	19	MASTER/SLAVE

DB PACKAGE (Top View)

LX5241/5242 ("N.C." = No Internal Connection)

1+	1	24	VTERM

1-	2	23	N.C.
2+	3	22	9-

2-	4	21	9+

3+	5	20	8-

3-	6	19	8+

4+	7	18	7-


4-	8	17	7+


5+	9	16	6-


5-	106	15	6+


	116	14
DISCONNECT			DIFFSENSE

	126	13
GND			MASTER/SLAVE

PW PACKAGE (Top View)

LX5241/5242 ("N.C." = No Internal Connection)

N.C.	1		28	VTERM


1+	2		27	N.C.

1-	3		26	9-


2+	4		25	9+


2-	5		24	8-


N.C.	6		23	8+

3+	7		22	N.C.

3-	8		21	7-

4+	9		20	7+

4-	106		19	6-

5+	116		18	6+

5-	126		17	DIFFB

DISCONNECT	136		16	DIFFSENSE

		146	15
GND				MASTER/SLAVE

PW PACKAGE (Top View)

LX5243 ("N.C." = No Internal Connection)

2		Copyright © 2000
2		Rev. 1.4 11/00

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

UltraMAX

LX5241/5242/5243

M U L T I M O D E S C S I T E R M I N A T O R

P R O D U C T I O N D A T A S H E E T

R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S

(Note 2)

Parameter

Symbol

Recommended Operating Conditions

Units

Min.

Typ.

Max.

Termpwr Voltage LVD

VTERM

3.0

5.25

3.5

5.25

Signal Line Voltage

5.0

Disconnect Input Voltage

VTERM

Operating Virtual Junction Temperature Range

LX5241C / 5242C / 5243C

°C

Note 2. Range over which the device is functional.

E L E C T R I C A L C H A R A C T E R I S T I C S

(Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤

TA ≤ 70°C,

TermPwr = 4.75V.

For the LX5241/5243 DISCONNECT = L, for the LX5242

DISCONNECT

= H. Low duty cycle pulse testing techniques are used which maintains junction and

case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions

LX5241 / 5242 / 5243

Units

Min.

Typ.

Max.

LVD Terminator Section

TermPwr Supply Current

LVD ICC

All term lines = Open

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V

µA

DISCONNECT

Common Mode Voltage

VCM

1.125

1.25

1.375

Offset Voltage

VFSB

Open circuit between - and + (see Note 3)

100

112

125

Differential Terminator Impedance

VOUT Differential = -1V to 1V

100

105

110

Ω

Common Mode Impedance

ZCM

0V to 2.5V

100

200

300

Ω

Output Capacitance

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V

2.5

DISCONNECT

Output Leakage

ILEAK

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V,

µA

DISCONNECT

VLINE = 0 to 4V, TA = 25°C

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V,

µA

DISCONNECT

VTERM = 0V, VLINE = 2.7V

Mode Change Delay

tDF

DIFFSENSE = 1.4V to 0V

115

DIFFSENSE Section

DIFFSENSE Output Voltage

VDIFF

1.2

1.3

1.4

DIFFSENSE Output Source Current

IDIFF

VDIFF = 0V

5.0

15.0

DIFFSENSE Sink Current

ISINK(DIFF)

VDIFF = 2.75V

200

µA

DIFFSENSE Output Leakage

ILEAK(DIFF)

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V,

µA

DISCONNECT

TA = 25°C

Single-Ended Termination Section

Termpwr Supply Current

SE ICC

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

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

214

226

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V

µA

DISCONNECT

Terminator Output High Volt

2.6

2.85

Output Current

VOUT = 0.2V

Sink Current

ISINK

VOUT = 4V, All lines

Output Capacitance

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V

2.5

DISCONNECT

Leakage Current

ILEAK

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V,

µA

DISCONNECT

VOUT = 0 to 4V, TA = 25°C

LX5241/5243: DISCONNECT > 2.0V, LX5242:

< 0.8V,

µA

DISCONNECT

VTERM = Open, VLINE = 2.7V, TA = 25°C

Note 3. Open circuit failsafe voltage.

Copyright © 2000	3
Rev. 1.4 11/00

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