MICROSEMI LX5250CPW

LX5250/5252
®
TM
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 LX5250, 36-pin QSOP: Pin
Compatible With DS2118,
UCC5630A and UCC5672
ƒ LX5250 28-pin TSSOP: Pin
Compatible with DS2119, and
UCC5672
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 10mA.
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.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
WWW . Microsemi .C OM
The LX5250/52 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 LX5250/52 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
PRODUCT HIGHLIGHT
-
L X 5250/
L X 5252
-
+
+
L X 5250/
L X 5252
LX5250/5252
PACKAGE ORDER INFO
TA (°C)
0 to 70
DB
QSOP
36-Pin
PW
TSSOP
28-Pin
RoHS Compliant / Pb-free
Transition DC: 0535
RoHS Compliant / Pb-free
Transition DC: 0518
LX5250CDB
LX5252CDB
LX5250CPW
-
Note: Available in Tape & Reel.
Append the letters “TR” to the part number. (i.e. LX5250CDB-TR)
Copyright © 2002
Rev. 1.2b, 2005-08-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX5250/5252
®
TM
9-Line Multimode SCSI Terminator
P RODUCTION
PACKAGE PIN OUT
Term Power (VTERM) .........................................................................................-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
(40 second maximum exposure)................................................................... 260°C (+0, -5)
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
NC
NC
NC
1+
12+
2HEATSINK
HEATSINK
HEATSINK
3+
34+
45+
5DISCONNECT
GND
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
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ABSOLUTE MAXIMUM RATINGS
DATA SHEET
LX5250/5252
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DB PACKAGE
53.9°C/W
(Top View)
N/C = Not internally connected
PW
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)
NC
1+
12+
2NC
3+
34+
45+
5DISCONNECT
GND
MASTER/SLAVE FUNCTION TABLE
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
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
0mA
H
1.3V
10mA Source
Open (Pull-Up)
1.3V
10mA Source
* When in Low state, terminator will sense state of DIFFSENSE line.
LX5252
LX5250
DISCONNECT DISCONNECT
Copyright © 2002
Rev. 1.2b, 2005-08-29
Outputs
DIFFSENSE
Status
Type
PACKAGE DATA
DIFFSENSE/POWER UP/POWER DOWN FUNCTION TABLE
Quiescent
Current
L
H
< 0.5V
Enable
SE
55mA
L
H
0.7V – 1.9V
Enable
LVD
35mA
L
H
> 2.4V
Disable
HI-Z
8mA
H or Open
L 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
LX5250/5252
®
TM
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
RECOMMENDED MAX OPERATING CONDITIONS
Symbol
LVD
SE
Signal Line Voltage
VTerm
VTERM
Disconnect Input Voltage
Operating Junction Temperature
TJ
Min
LX5250/52
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.
For the LX5250, DISCONNECT = L; for the LX5252, DISCONNECT = H.
LX5250/52
Parameter
Symbol
Test Conditions
Units
Min Typ Max
`
`
LVD Terminator Section
All term lines open
35
45
mA
LX5250: DISCONNECT > 2.0V;
LX5252: DISCONNECT < 0.8V
15
35
µA
1.125
1.25
1.375
V
100
112
125
mV
VTerm Supply Current
LVDICC
Common Mode Voltage
VCM
Offset Voltage
VOS
Open circuit between (-) and (+) terminals
Differential Terminator Impedance
ZO
VOUT Differential = -1V to +1V
100
105
110
Ω
Common Mode Impedance
ZCM
110
150
195
Ω
Output Capacitance (Note 1)
CO
0.5V to 2V
LX5250: DISCONNECT > 2.0V;
LX5252: DISCONNECT < 0.8V
3
pF
Mode Change Delay
tDF
Diffsense = 1.4V to 0V
100
115
300
ms
1.2
1.3
Diffsense Section
Diffsense Output Voltage
VDIFF
Diffsense Output Source Current
IDIFF
Diffsense Sink Current
`
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Parameter
ISINK(DIFF)
1.4
V
VDIFF = 0V
5
15
mA
VDIFF = 2.75V
20
200
µA
55
250
75
290
mA
mA
15
35
µA
2.5
2.85
3.1
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
LX5250: DISCONNECT > 2.0V;
LX5252: DISCONNECT < 0.8V
VO
IO
VOUT = 0.2V
Output Capacitance (Note 1)
CO
DISC > 2.0V
3
pF
IDDQ
LX5250: DISCONNECT > 2.0V;
LX5252: DISCONNECT < 0.8V,
VLINE = 0 to 4V, TA = 25°
2
µA
IHP
LX5250: DISCONNECT > 2.0V;
LX5252: DISCONNECT < 0.8V,
VTERM = Open, VLINE = 2.7V, TA = 25°
ZG
I = 1mA
Ground Driver Impedance
Copyright © 2002
Rev. 1.2b, 2005-08-29
mA
1
µA
100
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Ω
Page 3
ELECTRICALS
ISINK
Output Leakage
VOUT = 4V, All lines
mA
Sink Current
LX5250/5252
®
TM
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
`
DISCONNECT Section
Disconnect Thresholds
VTH
0.8
LX5250: DISCONNECT = 0V;
LX5252: DISCONNECT = 2.4V
LX5250: DISCONNECT = 2.4V;
LX5252: DISCONNECT = 0V
IIL
Input Current
IIH
`
2.0
V
10
µA
100
nA
MASTER/SLAVE Section
Master/Slave Thresholds
VTH(MS)
IIL(MS)
IIH(MS)
Input Current
0.8
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.
For the LX5250, DISCONNECT = L; for the LX5252, DISCONNECT = H.
LX5250/52
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
DISCONNECT
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 – LX5250/52 Block Diagram; 36-pin version shown
Copyright © 2002
Rev. 1.2b, 2005-08-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX5250/5252
®
TM
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
FUNCTIONAL PIN DESCRIPTION
DESCRIPTION
1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-
Negative signal termination lines for LVD mode. Signal termination lines for SE mode.
1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+
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PIN NAME
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
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.
VTERM
DISCONNECT
GND
Enables/Disables terminator. See Power Down Function Table for logic levels
for LX5250 and LX5252.
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.
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.
HEATSINK
Copyright © 2002
Rev. 1.2b, 2005-08-29
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
LVD
LX5250/5252
®
TM
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
PERIPHERAL
HOST
TERMPOWER
1-
VTERM
11+
1+
WWW . Microsemi .C OM
APPLICATION SCHEMATIC
TERMPOWER
VTERM
Data Lines (9)
LX5250/52
DISCONNECT
99+
99+
LX5250/52
GND
GND
DIFFSENS
DIFFB
NC*
Pin 1
4.7uF
4.7uF
DISCONNECT
DISC
DISC
DIFFSENS
DIFFB
50k
50k
4.7uF
4.7uF
1-
11+
VTERM
1+
NC*
Pin 1
4.7uF
VTERM
4.7uF
Data Lines (9)
LX5250/52
99+
99+
LX5250/52
DISC
DISC
GND
GND
DIFFSENS
DIFFSENS
DIFFB
DIFFB
NC*
Pin 1
4.7uF
NC*
Pin 1
11+
VTERM
11+
4.7uF
VTERM
Control Lines (9)
LX5250/52
99+
99+
LX5250/52
DISC
DISC
DIFFSENS
DIFFB
DIFFB
NC*
4.7uF
DIFFSENS
Pin 1
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
Copyright © 2002
Rev. 1.2b, 2005-08-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
APPLICATIONS
GND
GND
LX5250/5252
®
TM
9-Line Multimode SCSI Terminator
P RODUCTION
DATA SHEET
DB
36-Pin Quarter Size Outline Package (QSOP)
Dim
36
19
E P
1
18
B
F
D
E
A M
H
C
G
L
A
B
C
D
E
F
G
H
L
M
P
*LC
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
PW
28-Pin Thin Small Shrink Outline (TSSOP)
Dim
321
P
E
F
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
D
A
B
C
D
E
F
G
H
L
M
P
*LC
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. 1.2b, 2005-08-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX5250/5252
TM
®
9-Line Multimode SCSI Terminator
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. 1.2b, 2005-08-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8