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LX5250/5252
TM (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
DESCRIPTION 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 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.
KEY FEATURES
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IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
Compliant with SCSI SPI-2 (Ultra2), SPI-3 (Ultra160), and SPI-4 (Ultra320) Auto-Selectable LVD or SingleEnded Termination Fast Response, No Output Capacitors Required Compatible with Active Negation Drivers 15A 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) Available in 36-pin QSOP and 28pin TSSOP package LX5250, 36-pin QSOP: Pin Compatible With DS2118, UCC5630A and UCC5672 LX5250 28-pin TSSOP: Pin Compatible with DS2119, and UCC5672
PRODUCT HIGHLIGHT
+
L X 5250/ L X 5252
+
L X 5250/ L X 5252
LX5250/5252 LX5250/5252
PACKAGE ORDER INFO TA (C)
DB
QSOP 36-Pin
PW
TSSOP 28-Pin
RoHS Compliant / Pb-free Transition DC: 0535
RoHS Compliant / Pb-free Transition DC: 0518
0 to 70
LX5250CDB LX5252CDB
LX5250CPW -
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX5250CDB-TR)
Copyright (c) 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 (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
ABSOLUTE MAXIMUM RATINGS Term Power (VTERM) .........................................................................................-0.3V to 7V Operating Junction Temperature ................................................................................150C Storage Temperature Range........................................................-65C to 150C RoHS / Pb-free Peak Package Solder Reflow Temperature (40 second maximum exposure)................................................................... 260C (+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.
PACKAGE PIN OUT
NC NC NC 1+ 12+ 2HEATSINK HEATSINK HEATSINK 3+ 34+ 45+ 5DISCONNECT GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
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THERMAL DATA
VTERM HVD LVD SE 99+ 88+ HEATSINK HEATSINK HEATSINK 77+ 66+ DIFFB DIFFSENSE M/Sb
DB
36 Pin QSOP 53.9C/W
LX5250/5252 DB PACKAGE
(Top View) N/C = Not internally connected
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
PW
28 Pin TSSOP 100C/W
NC 1+ 12+ 2NC 3+ 34+ 45+ 5DISCONNECT GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. JA can vary significantly depending on mounting technique. (See Application Notes Section: Thermal considerations) MASTER/SLAVE FUNCTION TABLE Master/Slave
L* H Open (Pull-Up) HI Z 1.3V 1.3V
VTERM NC 99+ 88+ NC 77+ 66+ DIFFB DIFFSENSE M/Sb
LX5250 ONLY PW PACKAGE
(Top View)
DIFFSENSE Status
N/C = Not internally connected
0mA 10mA Source 10mA Source
RoHS / Pb-free 100% Matte Tin Lead Finish
* When in Low state, terminator will sense state of DIFFSENSE line.
DIFFSENSE/POWER UP/POWER DOWN FUNCTION TABLE LX5252 LX5250 DISCONNECT DISCONNECT
L L L H or Open H H H L or Open
PACKAGE DATA PACKAGE DATA
DIFFSENSE
< 0.5V 0.7V - 1.9V > 2.4V X
Outputs Status
Enable Enable Disable Disable
Type
SE LVD HI-Z HI-Z
Quiescent Current
55mA 35mA 8mA 10A
Copyright (c) 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 2
LX5250/5252
TM (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
RECOMMENDED MAX OPERATING CONDITIONS
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Parameter
LVD SE Signal Line Voltage VTerm Disconnect Input Voltage Operating Junction Temperature
Symbol
VTERM
Min
2.9 3.5 0 0 0
LX5250/52 Typ
Max
5.25 5.25 5.0 VTERM 125
Units
V V V C
TJ
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 70C, 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 VTerm Supply Current Common Mode Voltage Offset Voltage Differential Terminator Impedance Common Mode Impedance Output Capacitance (Note 1) LVDICC VCM VOS ZO ZCM CO Open circuit between (-) and (+) terminals VOUT Differential = -1V to +1V 0.5V to 2V LX5250: DISCONNECT > 2.0V; LX5252: DISCONNECT < 0.8V LX5250: DISCONNECT > 2.0V; LX5252: DISCONNECT < 0.8V 1.125 100 100 110 35 15 1.25 112 105 150 45 35 1.375 125 110 195 3 mA A V mV pF
ELECTRICAL CHARACTERISTICS
Mode Change Delay
Diffsense Section
tDF VDIFF IDIFF ISINK(DIFF)
Diffsense = 1.4V to 0V
100 1.2
115 1.3
300 1.4 15 200
ms V mA A mA mA A V mA mA
Diffsense Output Voltage Diffsense Output Source Current Diffsense Sink Current
Single Ended Section
VDIFF = 0V VDIFF = 2.75V All tem lines = Open, Master/Slave = 0V All tem lines = 0.2V, Master/Slave = 0V LX5250: DISCONNECT > 2.0V; LX5252: DISCONNECT < 0.8V
5 20 55 250 15 2.5 2.85 22.5 65
VTerm Supply Current Termination Output High Voltage Output Current Sink Current Output Capacitance (Note 1)
SEICC VO IO ISINK CO IDDQ
75 290 35 3.1 24 3 2
VOUT = 0.2V VOUT = 4V, All lines DISC > 2.0V LX5250: DISCONNECT > 2.0V; LX5252: DISCONNECT < 0.8V, VLINE = 0 to 4V, TA = 25 LX5250: DISCONNECT > 2.0V; LX5252: DISCONNECT < 0.8V, VTERM = Open, VLINE = 2.7V, TA = 25 I = 1mA
18.5 40
ELECTRICALS ELECTRICALS
pF A
Output Leakage IHP Ground Driver Impedance ZG
1 100
A
Copyright (c) 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 3
LX5250/5252
TM (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 70C, VTerm = 4.75V. For the LX5250, DISCONNECT = L; for the LX5252, DISCONNECT = H. LX5250/52 Parameter Symbol Test Conditions Units Min Typ Max
DISCONNECT Section
ELECTRICAL CHARACTERISTICS
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Disconnect Thresholds
VTH IIL LX5250: DISCONNECT = 0V; LX5252: DISCONNECT = 2.4V LX5250: DISCONNECT = 2.4V; LX5252: DISCONNECT = 0V
0.8
2.0 10 100
V A nA
Input Current IIH
MASTER/SLAVE Section
Master/Slave Thresholds Input Current
Note 1: Guaranteed by design.
VTH(MS) IIL(MS) IIH(MS) Master/Slave = 0V Master/Slave = 2.4V
0.8 100
2.0 10
V A nA
BLOCK DIAGRAM
VTERM
36
1.07 mA
1 of 9 Terminator Pairs
SE LVD HVD 52.5 SE LVD 150 HVD 52.5
22.4mA I-Limited 2.7V Source LVD(-) /SE
5
DISCONNECT
17
DISC
4
LVD(+) /SE (Pseudo-GND)
1.25V 10mA I-Limited 1.3V Source
20
M/S
19
1.07 mA
18
GND
SE DIFSENSE
20
20K
Window Comp.
HVD
LVD
POWER ON & MODE DELAY
ELECTRICALS ELECTRICALS
DIFFB
DISC
21 33
LATCH SE HVD LVD
35 34
Figure 1 - LX5250/52 Block Diagram; 36-pin version shown
Copyright (c) 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 (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
FUNCTIONAL PIN DESCRIPTION
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PIN NAME 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-
DESCRIPTION Negative signal termination lines for LVD mode. Signal termination lines for SE mode.
1+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+
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 4.7F 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 0.1F capacitors at VTERM pin.
DISCONNECT
Enables/Disables terminator. See Power Down Function Table for logic levels for LX5250 and LX5252.
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. 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 resistor. Internally connected to DIFFSENSE pin through a 20K 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 resistor & 4.7F) is not required on the LX5250 as it has an internal timer. Single-Ended output; when High, terminator is operating in SE mode.
GND
MASTER/SLAVE
DIFFSENSE
DIFFB
SE
LVD
Low Voltage Differential output; when High, terminator is operating in LVD mode.
PACKAGE DATA PACKAGE DATA
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.
HEATSINK
Copyright (c) 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 5
LX5250/5252
TM (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
APPLICATION SCHEMATIC
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HOST
TERMPOWER VTERM 11+ Data Lines (9) 99+
PERIPHERAL
11+ 99+ VTERM
TERMPOWER
DISCONNECT
LX5250/52
DISC GND
LX5250/52
DISC GND
DISCONNECT
NC* 4.7uF 4.7uF
DIFFSENS DIFFB
Pin 1
DIFFSENS DIFFB 50k 50k 4.7uF
Pin 1
NC* 4.7uF 4.7uF
4.7uF
VTERM
11+ Data Lines (9) 99+
11+ 99+
VTERM
LX5250/52
DISC GND
LX5250/52
DISC GND
DIFFSENS NC* 4.7uF
Pin 1
DIFFB
DIFFSENS DIFFB
Pin 1
NC* 4.7uF
VTERM
11+ Control Lines (9) 99+
11+ 99+
VTERM
LX5250/52
DISC GND
LX5250/52
DISC
APPLICATIONS
GND DIFFSENS DIFFSENS DIFFB
Pin 1
NC* 4.7uF
Pin 1
DIFFB
NC* 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 (c) 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
LX5250/5252
TM (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
MECHANICAL DRAWINGS
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DB
36
36-Pin Quarter Size Outline Package (QSOP)
Dim
19
EP
1
18
B D H
F E AM G L C
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 -
*Lead Coplanarity
PW
28-Pin Thin Small Shrink Outline (TSSOP)
Dim
321
E
P
F D AH
SEATING PLANE
B
G
L
C
M
A B C D E F G H L M P *LC
Note:
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
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 MECHANICALS
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 (c) 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 (R)
9-Line Multimode SCSI Terminator
PRODUCTION
DATA SHEET
NOTES
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N 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 (c) 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

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