LIN D O C #: 5240
UltraMAX
TM
M U LT I M O D E , P L U G
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
LX5240
AND
P L AY S C S I T E R M I N AT O R
R O D U C T I O N
DESCRIPTION
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
D
A T A
S
H E E T
K E Y F E AT U R E S
■ 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 SingleEnded 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
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.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
B U S V O L TA G E
V OD
VOD = V(-) - V(+), Logic = 0
V(+)
NEGATED
VCM
100mV
0V
V(-)
-100mV
LX5240
LX5240
PA C K A G E O R D E R I N F O
TA (°C)
SSOP
DB Plastic
36-pin
0 to 70
LX5240CDB
TSSOP
PW Plastic
24-pin
LX5240CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5240CDBT)
Copyright © 1999
Rev. 1.1 10/00
LINFINITY MICROELECTRONICS INC.
11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5240
M U LT I M O D E , P L U G
P
AND
P L AY S C S I T E R M I N AT O R
R O D U C T I O N
A B S O L U T E M A X I M U M R AT I N G S
D
A T A
S
H E E T
PACKAGE PIN OUTS
(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
N.C.
N.C.
DISCONNECT A
1+
12+
2HEATSINK
HEATSINK
HEATSINK
3+
34+
45+
5DISCONNECT B
GND
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.
T H E R MAL D ATA
DB PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
50°C/W
PW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
100°C/W
1+
12+
23+
34+
45+
5DISCONNECT B
GND
MASTER / SLAVE FUNCTION TABLE
L*
H
Open (Pull-up)
DIFFSENSE
Status
HI Z
1.3V
1.3V
36
2
35
3
34
4
33
5
32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
13
24
14
23
15
22
16
21
17
20
18
19
VTERM
HVD
LVD
SE
99+
88+
HEATSINK
HEATSINK
HEATSINK
77+
66+
DIFF B
DIFFSENSE
MASTER/SLAVE
DB PACKAGE (Top View)
("N.C." = No Internal Connection)
Junction Temperature Calculation: TJ = TA + (PD x θJA).
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
1
Output
Current
0mA
15mA Source
15mA Source
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
VTERM
DISCONNECT A
99+
88+
77+
66+
DIFFSENSE
MASTER/SLAVE
PW PACKAGE (Top View)
("N.C." = No Internal Connection)
* When in Low state, terminator will detect state of DIFFSENSE line.
DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE
DISCONNECT A DISCONNECT B
2
DIFF
SENSE
Status
Outputs
Type
Quiescent
Current
H
L
L
H
L < 0.5V
Enable
S.E.
7mA
H
L
L
H
0.7 to 1.9V
Enable
LVD
21mA
H
L
L
H
H > 2.4V
Disable
HI Z
1mA
L
H
Open
L
H
Open
X
Disable
HI Z
10µA
Copyright © 1999
Rev. 1.1 10/00
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5240
M U LT I M O D E , P L U G
P
AND
R O D U C T I O N
P L AY S C S I T E R M I N AT O R
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
Parameter
Termpwr Voltage
Symbol
LVD
SE
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
VTERM
Signal Line Voltage
Disconnect Input Voltage
Operating Virtual Junction Temperature Range
LX5240C
Note 2. Range over which the device is functional.
Units
3.0
3.5
0
0
5.25
5.25
5.0
VTERM
V
V
V
V
0
70
°C
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
Min.
LX5240
Typ.
Max.
Units
LVD Terminator Section
TermPwr Supply Current
Common Mode Voltage
Offset Voltage
Differential Terminator Impedance
Common Mode Impedance
Output Capacitance
Output Leakage
Mode Change Delay
LVD ICC
VCM
VFSB
ZD
ZCM
CO
ILEAK
tDF
All term lines = Open
DISCONNECT A or B = LOW
Open circuit between - and + (see Note 3)
VOUT Differential = -1V to 1V
0V to 2.5V
DISCONNECT A or B = LOW
DISCONNECT A or B = LOW, VLINE = 0 to 4V, TA = 25°C
DISCONNECT A or B = LOW, VTERM = 0V, VLINE = 2.7V
DIFFSENSE = 1.4V to 0V
1.125
100
100
100
25
15
1.25
112
105
200
2.5
30
35
1.375
125
110
300
2
1
115
mA
µA
V
mV
Ω
Ω
pF
µA
µA
ms
DIFFSENSE Section
DIFFSENSE Output Voltage
DIFFSENSE Output Source Current
DIFFSENSE Sink Current
DIFFSENSE Output Leakage
VDIFF
IDIFF
ISINK(DIFF)
ILEAK(DIFF)
VDIFF = 0V
VDIFF = 2.75V
DISCONNECT A or B = LOW, TA = 25°C
1.2
5.0
1.3
1.4
15.0
200
10
V
mA
µA
µA
7
214
15
2.85
23
65
2.5
10
226
35
mA
mA
µA
V
mA
mA
pF
µA
µA
Ω
°C
Single-Ended Termination Section
Termpwr Supply Current
Terminator Output High Volt
Output Current
Sink Current
Output Capacitance
Leakage Current
Ground Driver Impedance
Thermal Shutdown
SE ICC
VO
IO
ISINK
CO
ILEAK
ZG
All term lines = Open, Master/Slave = 0V
All term lines = 0.2V, Master/Slave = 0V
DISCONNECT A or B = LOW
VOUT = 0.2V
VOUT = 4V, All lines
DISCONNECT A or B = LOW
DISCONNECT A or B = LOW, VOUT = 0 to 4V, TA = 25°C
DISCONNECT A or B = LOW, VTERM = 0V, V LINE = 2.7V
I = 1mA
2.6
21
45
24
2
1
100
150
Note 3. Open circuit failsafe voltage.
Copyright © 1999
Rev. 1.1 10/00
3
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5240
M U LT I M O D E , P L U G
P
AND
P L AY S C S I T E R M I N AT O R
D
R O D U C T I O N
A T A
S
H E E T
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test Conditions
Min.
LX5240
Typ.
Max.
Units
DISCONNECT Section (Plug n' Play)
DISCONNECT A/B Thresholds
Input Current
VTH
IIL
IIH
DISCONNECT A/B = 0V
DISCONNECT A/B = 2.4V
0.8
VTH (MS)
IIL (MS)
IIH (MS)
MASTER / SLAVE = 0V
MASTER / SLAVE = 2.4V
2.0
10
V
µA
nA
2.0
10
V
µA
nA
100
MASTER / SLAVE Section
MASTER / SLAVE Thresholds
Input Current
0.8
100
BLOCK DIAGRAM
DISCONNECT
(-)
RSE
RLVD
(+)
RLVD
VBG
Ground Driver
FIGURE 1 — LX5240 Block Diagram
4
Copyright © 1999
Rev. 1.1 10/00
PRODUCT DATABOOK 1996/1997
UltraMAX
LX5240
M U LT I M O D E , P L U G
P
AND
R O D U C T I O N
P L AY S C S I T E R M I N AT O R
D
A T A
S
H E E T
A P P L I C AT I O N S C H E M AT I C
HOST
TERM POWER
5V
DB (7)DB (7)+
DB (7)DB (7)+
~ ~
DB (0) DB (0) +
VTERM
~ ~
LX5240
M/S*
M/S
DIFFSENSE
TERMPWR
~ ~
ATN ATN +
~ ~
ACK ACK +
SCSI CABLE
ATN ATN +
LX5240
ACK ACK +
M/S
VTERM
LX5240
Plug n' Play
VTERM
DIFFSENSE
2.2µF
DIFFSENSE
DIFFSENSE
Plug n' Play
DIFFSENSE
DB (0) DB (0) +
LX5240
TERMPWR
5V
Plug n' Play
Plug n' Play
2.2µF
TERM POWER
DIFFSENSE (1.3V)
DIFFSENSE
VTERM
PERIPHERAL
M/S
Note: Single-ended the + signals become ground, DIFFSENSE < 0.5V.
* M/S = MASTER/SLAVE
FIGURE 2 — LX5240 Application Schematic
UltraMAX is a trademark of LinFinity Microelectronics Inc.
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.
Copyright © 1999
Rev. 1.1 10/00
5