LX5251CPW

LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET DESCRIPTION The LX5251 is a multimode SCSI terminator that is compatible with the SCSI SPI-2 (Ultra2), SCSI SPI-3 (Ultra3 or Ultra160), 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 LX5251 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 LX5251 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 15mA. Tying the DIFFSENSE pin high places the LX5251 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 LX5251 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 LX5251 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 W WW . Microsemi . C OM 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 24-pin TSSOP Package IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT + L X 5251 + L X 5251 LX5251 LX5251 PACKAGE ORDER INFO Plastic TSSOP PW 24-Pin TA (°C) 0 to 70 LX5251CPW RoHS Compliant / Pb-free Transition DC: 0442 Note: Available in Tape & Reel.Append the letters “TR” to the part number. (i.e. LX5251CPW-TR) Copyright © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET ABSOLUTE MAXIMUM RATINGS Term Power (VTERM) ................................................................................................-0.3V to 7V Operating Junction Temperature .......................................................................................150°C Storage Temperature Range ............................................................................... -65°C to 150°C 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. PACKAGE PIN OUT W WW . Microsemi . C OM 1+ 12+ 23+ 34+ 45+ 5DISC GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VTERM NC 99+ 88+ 77+ 66+ DIFFSENSE M/Sb THERMAL DATA PW PACKAGE (Top View) PW 24 Pin Plastic TSSOP 100°C/W N/C = Not internally connected RoHS / Pb-free 100% Matte Tin Lead Finish THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 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. MASTER/SLAVE FUNCTION TABLE Master/Slave L* H Open (Pull-Up) DIFFSENSE Status HI Z 1.3V 1.3V 0mA 10mA Source 10mA Source * When in Low state, terminator will sense state of DIFFSENS line. DIFFSENSE/POWER UP/POWER DOWN FUNCTION TABLE PACKAGE DATA PACKAGE DATA DISCONNECT DIFFSENSE L L L H or Open < 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 10µA Copyright © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET RECOMMENDED MAX OPERATING CONDITIONS W WW . Microsemi . C OM Parameter LVD SE Signal Line Voltage VTerm Disconnect Input Voltage Operating Junction Temperature Symbol VTERM Min 2.9 3.5 0 0 0 LX5251 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 0°C ≤ TA ≤ 70°C, VTerm = 4.75V, and DISC = L. LX5251 Parameter Symbol Test Conditions Units Min Typ Max LVD Terminator Section VTerm Supply Current Common Mode Voltage Offset Voltage Differential Terminator Impedance Common Mode Impedance Output Capacitance (Note 1) Mode Change Delay Diffsense Section Diffsense Output Voltage Diffsense Output Source Current Diffsense Sink Current Single Ended Section VTerm Supply Current Termination Output High Voltage Output Current Sink Current Output Capacitance (Note 1) Output Leakage Ground Driver Impedance SEICC VO IO ISINK CO IDDQ IHP ZG VOUT = 0.2V VOUT = 4V, All lines DISC > 2.0V DISC > 2.0V ; VLINE = 0 to 4V, TA = 25° DISC > 2.0V ;VTERM = Open, VLINE = 2.7V, TA = 25° I = 1mA All tem lines = Open, Master/Slave = 0V All tem lines = 0.2V, Master/Slave = 0V DISC > 2.0V; TA = 25° 2.5 18.5 40 55 250 15 2.7 22.5 65 3 2 1 100 75 290 35 3.1 24 mA mA µA V mA mA pF µA µA Ω VDIFF IDIFF ISINK(DIFF) VDIFF = 0V VDIFF = 2.75V 1.2 5 20 1.3 1.4 15 200 V mA µA LVDICC VCM VOS ZO ZCM CO tDF Open circuit between (-) and (+) terminals VOUT Differential = -1V to +1V 0.5V to 2V DISC > 2.0V Diffsense = 1.4V to 0V 100 115 All term lines open DISC > 2.0V 1.125 100 100 110 35 15 1.25 112 105 150 45 35 1.375 125 110 195 3 300 mA µA V mV Ω Ω pF ms ELECTRICAL CHARACTERISTICS ELECTRICALS Copyright © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 125°C, VTerm = 4.75V, and DISCONNECT = L. LX5251 Parameter Symbol Test Conditions Units Min Typ Max DISCONNECT Section Disconnect Thresholds Input Current 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 µA nA VTH IIL IIH DISC = 0V DISC = 2.4V 0.8 100 10 2.0 V nA µA ELECTRICAL CHARACTERISTICS (CONTINUED) W WW . Microsemi . C OM BLOCK DIAGRAM VTERM 24 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 2 DISC 11 DISC 1 LVD(+) /SE (Pseudo-GND) 1.25V 10mA I-Limited 1.3V Source 20 M/S 13 1.07 mA 12 GND SE DIFSENSE 14 20K DIFFB Window Comp. HVD LVD POWER ON & MODE DELAY ELECTRICALS ELECTRICALS DISC SE LATCH HVD LVD Figure 1 – LX5251 Block Diagram Copyright © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET FUNCTIONAL PIN DESCRIPTION W WW . Microsemi . C OM PIN NAME 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 91+, 2+, 3+, 4+, 5+, 6+, 7+, 8+, 9+ DESCRIPTION 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. Musts 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 GND Enables/Disables terminator. See Power Down Function Table for logic levels. 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. Note: Must connect Diffsense signal to Diffsense pin of LX5251. MASTER/SLAVE DIFFSENSE PACKAGE DATA PACKAGE DATA Copyright © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET APPLICATION SCHEMATIC W WW . Microsemi . C OM HOST TERMPOWER VTERM 11+ Data Lines (9) 99+ PERIPHERAL 11+ 99+ VTERM TERMPOWER DISCONNECT DISC GND LX5251 LX5251 DISC GND DISCONNECT DIFFSENS DIFFSENS 4.7uF VTERM 11+ Data Lines (9) 99+ 11+ 99+ VTERM 4.7uF LX5251 DISC GND LX5251 DISC GND DIFFSENS DIFFSENS VTERM 11+ Control Lines (9) 99+ 11+ 99+ VTERM LX5251 DISC GND LX5251 DISC APPLICATIONS APPLICATIONS GND DIFFSENS DIFFSENS * DIFFB pin not present on the LX5251CPW. Must connect Diffsense signal to Diffsens pin of each terminator. Figure 2 – Microsemi Application Schematic Copyright © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET MECHANICAL DRAWINGS W WW . Microsemi . C OM PW 24-Pin Thin Small Shrink Outline (TSSOP) 321 E P F D AH SEATING PLANE B G L INCHES MIN MAX 0.033 0.037 0.007 0.012 0.0035 0.008 0.303 0.311 0.169 0.177 0.025 BSC 0.002 0.005 – .0433 0.020 0.030 0° 8° 0.246 0.256 – 0.004 C M Dim A B C D E F G H L M P *LC * Lead Coplanarity MILLIMETERS MIN MAX 0.85 0.95 0.19 0.30 0.09 0.20 7.70 7.90 4.30 4.50 0.65 BSC 0.05 0.15 – 1.10 0.50 0.75 0° 8° 6.25 6.55 – 0.10 M MECHANICALS 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. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX5251 TM ® 9-Line Multimode SCSI Terminator P R ODUCTION DATA SHEET NOTES W WW . Microsemi . C OM 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 © 2002 Rev. 1.1, 2006-02-27 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8