LX5250.pdf

LX5250
I N T E G R A T E D
P R O D U C T S
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
KEY FEATURES
DESCRIPTION
ƒ Compliant with SCSI SPI-2
(Ultra2), SPI-3 (Ultra160), and
SPI-4 (Ultra320)
ƒ Auto-Selectable LVD or SingleEnded Termination
ƒ Fast Response, No Output
Capacitors Required
ƒ Compatible with Active Negation
Drivers
ƒ 15µA Supply Current in
Disconnect Mode
ƒ Logic Command Disconnects All
Termination Lines
ƒ Diffsense Line Driver
ƒ Ground Driver Integrated for
Single-Ended Operation
ƒ Current Limit and Thermal
Protection
ƒ Hot-Swap Compatible (SingleEnded)
ƒ Available in 36-pin QSOP and 28pin TSSOP package
ƒ 36-pin QSOP: Pin Compatible
With DS2118, UCC5630A and
UCC5672
ƒ 28-pin TSSOP: Pin Compatible
with DS2119, and UCC5672
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 10mA.
Tying the DIFFSENSE pin high places the
LX5250 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 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 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.
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The LX5250 is a multimode SCSI
terminator that is compatible with the
SCSI SPI-2 (Ultra2 SCSI), SCSI SPI-3
(Ultra3 SCSI or Ultra160 SCSI), and
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
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 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 is enabled, the
differential sense (DIFFSENSE) pin
supplies a voltage between 1.2V and
1.4V. In
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
-
L X 5250
-
+
+
L X 5250
LX5250
PACKAGE ORDER INFO
QSOP
TSSOP
TA (°C)
PW 28-Pin
DB 36-Pin
0 to 70
LX5250CDB
LX5250CPW
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX5250CDBT)
Copyright  2002
Rev. 1.0b, 2003-07-01
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX5250
I N T E G R A T E D
9-Line Multimode SCSI Terminator
P R O D U C T S
P RODUCTION
DATA SHEET
PACKAGE PIN OUT
Term Power (VTERM)......................................................................................... -0.3V to 7V
Operating Junction Temperature................................................................................ 150°C
Storage Temperature Range………………………………………………..-65°C to 150°C
Lead Temperature (Soldering 10 seconds)................................................................. 300°C
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.
THERMAL DATA
DB
1
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
36 Pin QSOP
VTERM
HVD
LVD
SE
99+
88+
HEATSINK
HEATSINK
HEATSINK
77+
66+
DIFFB
DIFFSENSE
M/Sb
DB PACKAGE
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
PW
NC
NC
NC
1+
12+
2HEATSINK
HEATSINK
HEATSINK
3+
34+
45+
5DISC
GND
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ABSOLUTE MAXIMUM RATINGS
53.9°C/W
N/C = Not internally connected
NC
1+
12+
2NC
3+
34+
45+
5DISC
GND
28 Pin TSSOP
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
100°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow. θJA can vary significantly depending on
mounting technique. (See Application Notes Section: Thermal considerations)
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VTERM
NC
99+
88+
NC
77+
66+
DIFFB
DIFFSENSE
M/Sb
PW PACKAGE
MASTER/SLAVE FUNCTION TABLE
(Top View)
N/C = Not internally connected
Master/Slave
DIFFSENSE Status
L*
HI Z
0mA
H
1.3V
10mA Source
Open (Pull-Up)
1.3V
10mA Source
* When in Low state, terminator will sense state of DIFFSENSE line.
DIFFSENSE/POWER UP/POWER DOWN FUNCTION TABLE
Copyright  2002
Rev. 1.0b, 2003-07-01
Outputs
Status
Type
PACKAGE DATA
DISCONNECT DIFFSENSE
Quiescent
Current
L
< 0.5V
Enable
SE
55mA
L
0.7V – 1.9V
Enable
LVD
35mA
L
> 2.4V
Disable
HI-Z
8mA
H or Open
X
Disable
HI-Z
10µA
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX5250
I N T E G R A T E D
9-Line Multimode SCSI Terminator
P R O D U C T S
P RODUCTION
DATA SHEET
RECOMMENDED MAX OPERATING CONDITIONS
Symbol
LVD
SE
Signal Line Voltage
VTerm
VTERM
Disconnect Input Voltage
Operating Junction Temperature
TJ
Min
LX5250
Typ
Units
Max
2.9
3.5
0
5.25
5.25
5.0
0
VTERM
V
0
125
°C
V
V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C, VTerm = 4.75V,
and DISCONNECT = L.
LX5250
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
`
`
LVD Terminator Section
All term lines open
DISC > 2.0V
1.125
35
15
1.25
45
35
1.375
mA
µA
V
Open circuit between (-) and (+) terminals
100
112
125
mV
VOUT Differential = -1V to +1V
100
105
110
Ω
110
150
195
Ω
3
pF
VTerm Supply Current
LVDICC
Common Mode Voltage
VCM
Offset Voltage
VOS
Differential Terminator Impedance
ZO
Common Mode Impedance
ZCM
0.5V to 2V
Output Capacitance (Note 1)
CO
DISC > 2.0V
Mode Change Delay
tDF
Diffsense = 1.4V to 0V
100
115
300
ms
1.2
1.3
1.4
V
Diffsense Section
Diffsense Output Voltage
Diffsense Output Source Current
Diffsense Sink Current
`
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Parameter
VDIFF
IDIFF
ISINK(DIFF)
VDIFF = 0V
5
15
mA
VDIFF = 2.75V
20
200
µA
2.5
55
250
15
2.7
75
290
35
3.1
mA
mA
µA
V
18.5
22.5
24
40
65
Single Ended Section
VTerm Supply Current
Termination Output High Voltage
Output Current
SEICC
All tem lines = Open, Master/Slave = 0V
All tem lines = 0.2V, Master/Slave = 0V
DISC > 2.0V; TA = 25°
VO
IO
VOUT = 0.2V
ISINK
VOUT = 4V, All lines
Output Capacitance (Note 1)
CO
IDDQ
DISC > 2.0V
DISC > 2.0V ; VLINE = 0 to 4V, TA = 25°
DISC > 2.0V ;VTERM = Open, VLINE = 2.7V,
TA = 25°
I = 1mA
Output Leakage
IHP
Ground Driver Impedance
Copyright  2002
Rev. 1.0b, 2003-07-01
ZG
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
mA
mA
3
2
1
pF
µA
µA
100
Ω
Page 3
ELECTRICALS
Sink Current
LX5250
I N T E G R A T E D
9-Line Multimode SCSI Terminator
P R O D U C T S
P RODUCTION
DATA SHEET
`
DISCONNECT Section
Disconnect Thresholds
VTH
Input Current
`
0.8
IIL
IIH
DISC = 0V
DISC = 2.4V
2.0
V
10
nA
µA
100
MASTER/SLAVE Section
Master/Slave Thresholds
VTH(MS)
0.8
IIL(MS)
IIH(MS)
Input Current
Master/Slave = 0V
Master/Slave = 2.4V
100
2.0
V
10
µA
nA
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ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C, VTerm = 4.75V,
and DISCONNECT = L.
LX5250
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
Note 1: Guaranteed by design.
BLOCK DIAGRAM
VTERM
1 of 9
Terminator
Pairs
36
22.4mA
I-Limited
2.7V
Source
1.07 mA
SE
LVD
5
HVD
LVD(-)
/SE
52.5
DISC
17
SE
DISC
LVD
150
52.5
1.25V
M/S
10mA
I-Limited
1.3V
Source
19
HVD
LVD
POWER
ON
&
MODE
DELAY
GND
ELECTRICALS
20K
DIFFB
20
18
Window
Comp.
20
LVD(+)
/SE (Pseudo-GND)
1.07 mA
SE
DIFSENSE
4
HVD
DISC
21
LATCH
33
SE
35
HVD
34
LVD
Figure 1 – LX5250 Block Diagram; 36-pin version shown
Copyright  2002
Rev. 1.0b, 2003-07-01
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX5250
I N T E G R A T E D
P R O D U C T S
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
FUNCTIONAL PIN DESCRIPTION
DESCRIPTION
1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-
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.
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
VTERM
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 VTERM pin.
DISCONNECT
Enables/Disables terminator. See Power Down Function Table for logic levels.
GND
Terminator ground pin. Connect to ground.
MASTER/SLAVE
DIFFSENSE
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.
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.
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.
HVD
High Voltage Differential output; when High, terminator is operating in HVD mode.
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.
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
PACKAGE DATA
HEATSINK
Copyright  2002
Rev. 1.0b, 2003-07-01
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PIN NAME
LX5250
I N T E G R A T E D
9-Line Multimode SCSI Terminator
P R O D U C T S
P RODUCTION
DATA SHEET
PERIPHERAL
HOST
TERMPOWER
11+
VTERM
11+
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APPLICATION SCHEMATIC
TERMPOWER
VTERM
Data Lines (9)
LX5250
DISCONNECT
99+
99+
LX5250
GND
GND
DIFFSENS
DIFFB
NC*
Pin 1
4.7uF
4.7uF
DISCONNECT
DISC
DISC
DIFFSENS
DIFFB
50k
50k
4.7uF
4.7uF
11+
11+
VTERM
NC*
Pin 1
4.7uF
VTERM
4.7uF
Data Lines (9)
LX5250
99+
99+
LX5250
DISC
DISC
GND
GND
DIFFSENS
DIFFB
DIFFSENS
DIFFB
NC*
Pin 1
4.7uF
NC*
Pin 1
11+
VTERM
1-
4.7uF
VTERM
1+
Control Lines (9)
LX5250
99+
99+
LX5250
DISC
DISC
GND
DIFFSENS
DIFFSENS
DIFFB
DIFFB
NC*
4.7uF
APPLICATIONS
GND
Pin 1
Pin 1
NC*
4.7uF
* The capacitor on Pin 1 can be placed on the LX5250CDB to be pin compatible with other devices. This capacitor is not required.
Figure 2 – Application Diagram
Copyright  2002
Rev. 1.0b, 2003-07-01
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX5250
I N T E G R A T E D
9-Line Multimode SCSI Terminator
P R O D U C T S
P RODUCTION
DATA SHEET
DB
36-Pin Quarter Size Outline Package (QSOP)
Dim
36
A
B
C
D
E
F
G
H
L
M
P
*LC
19
E
1
P
18
B
F
ZD
D
E
A
G
C
L
M
MILLIMETERS
MIN
MAX
2.14
2.54
0.29
0.51
0.23
0.32
15.20
15.40
7.40
7.60
0.80 BSC
0.10
0.30
2.44
2.64
0.51
1.01
0°
8°
10.11
10.51
0.10
−
INCHES
MIN
MAX
0.084
0.100
0.011
0.020
0.009 0.0125
0.598
0.606
0.291
0.299
0.031 BSC
0.004
0.012
0.096
0.104
0.020
0.040
0°
8°
0.398
0.004
0.004
−
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MECHANICAL DRAWINGS
*Lead Coplanarity
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.
PW
28-Pin Thin Small Shrink Outline (TSSOP)
Dim
321
F
D
AH
SEATING PLANE
B
G
L
C
M
INCHES
MIN
MAX
0.033
0.037
0.007
0.012
0.003
0.008
0.378
0.390
0.169
.176
0.025 BSC
0.002
0.005
–
0.043
0.020
0.030
0°
8°
0.246
0.256
–
0.004
MECHANICALS
A
B
C
D
E
F
G
H
L
M
P
*LC
P
E
MILLIMETERS
MIN
MAX
0.85
0.95
0.19
0.30
0.09
0.20
9.60
9.80
4.30
4.50
0.65 BSC
0.05
0.15
–
1.10
0.50
0.75
0°
8°
6.25
6.50
–
0.10
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.
Copyright  2002
Rev. 1.0b, 2003-07-01
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX5250
I N T E G R A T E D
9-Line Multimode SCSI Terminator
P R O D U C T S
P RODUCTION
DATA SHEET
WWW . Microsemi .C OM
NOTES
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.
Copyright  2002
Rev. 1.0b, 2003-07-01
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8