LX5250/5252 ® TM 9-Line Multimode SCSI Terminator P RODUCTION DATA SHEET KEY FEATURES DESCRIPTION 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 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) 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 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 WWW . Microsemi .C OM 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 ` WWW . Microsemi .C OM 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 WWW . Microsemi .C OM 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+ WWW . Microsemi .C OM 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 − WWW . Microsemi .C OM 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