LX5112A

LIN D O C # : 51115 UltraMAX T HE TM LX5111A/5112A D ATA U LT R A 9 - CHANNEL S C S I TE R M I N ATOR I NFINITE P OWER OF I N N O VAT I O N P RELIMINARY S HEET DESCRIPTION The LX5111A/5112A SCSI terminators are part of Linfinity's UltraMAX family of high-performance, adaptive, non-linear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in their design offers superior performance to older linear passive and active techniques. Linfinity's UltraMAX architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible — typically 35MHz, which is 100 times faster than the older linear regulator/terminator approach used by other manufacturers. Products using this older linear regulator approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). The UltraMAX architecture also eliminates the output compensation capacitor typical in earlier terminator designs. Each is approved for use with SCSI-1, -2, -3, UltraSCSI and beyond — providing the highest performance alternative available today. Another key improvement offered by the LX5111A/12A lies in their ability to insure reliable, error-free communications even in systems which do not adhere to recommended SCSI hardware design guidelines, such as the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem. The LX5111A/12A architecture is much more tolerant of marginal system integrations. Recognizing the needs of portable and configurable peripherals, the LX5111A/12A have a TTL compatible sleep/disable mode. Quiescent current is typically less than 275µA in this mode, while the output capacitance is also less than 3pF. The obvious advantage of extended battery life for portable systems is inherent in the product's sleep-mode feature. Additionally, the disable function permits factory-floor or production-line configurability, reducing inventory and productline diversity costs. Field configurability can also be accomplished without physically removing components which, often times results in field returns due to mishandling. Reduced component counts is also inherent in the LX5111A/12A's architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20µF in value and size. The LX5111A/12A architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs. K E Y F E AT U R E S s Ultra-Fast Response For FAST-20 SCSI Applications s 35MHz Channel Bandwidth s 3.0V Operation s Less Than 3pF Output Capacitance s Thermally Self-Limiting s NO External Compensation Capacitors s Implements 8-bit Or 16-bit (Wide) Applications s Compatible with Active Negation Drivers s Compatible With Passive And Active Terminations s Approved For Use With SCSI 1, 2, 3 And Ultra SCSI s Hot-Swap Compatible s Pin-For-Pin Compatible With LX5211 and UC5606 (LX5111) s Pin-For-Pin Compatible With LX5212 And UC5603/5613/5614 (LX5112) IMPORTANT: For the most current data, consult LinFinity's web site: h ttp://www.linfinity.com. PRODUCT HIGHLIGHT R E C E I V I N G W AV E F O R M - 2 0 M H Z D R I V I N G W AV E F O R M - 2 0 M H Z Receiver 1 Meter, AWG 28 LX5111A/5112A LX5268 Driver NOTE: LX5111A/5112A For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The SingleEnded SCSI Bus" LX5268 PA C K A G E O R D E R I N F O R M AT I O N TA (°C) 0 to 70 DP Plastic SOIC 16-pin, Power LX5111ACDP LX5112ACDP PWP Plastic TSSOP 24-pin, Power LX5111ACPWP LX5112ACPWP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5111ACDPT) Copyright © 1999 Rev. 0.1 3/99 LINFINITY MICROELECTRONICS INC. 11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 LX5111A/5112A U LT R A 9 - CHANNEL S C S I TE R M I N ATOR P RELIMINARY UltraMAX D ATA S HEET A B S O L U T E M A X I M U M R AT I N G S (Note 1) PACKAGE PIN OUTS T7 T8 T9 HEATSINK/GND GND DISCONNECT * T1 T2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 TermPwr Voltage ................................................................................................. +7V Signal Line Voltage ................................................................................... 0V to +7V Regulator Output Current ................................................................................... 0.4A Operating Junction Temperature Plastic (DP, PWP Packages) ........................................................................ 150°C Storage Temperature Range .............................................................. -65°C to 150°C Lead Temperature (Soldering, 10 seconds) .................................................... 300°C Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. T6 T5 N.C. HEATSINK/GND HEATSINK/GND VTERM T4 T3 DP PACKAGE (Top View) T H E R MAL DATA DP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, θJL THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA PWP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, θJL THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 27°C/W 100°C/W 20°C/W 50°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. T7 T8 T9 N.C. GND HEATSINK/GND HEATSINK/GND HEATSINK/GND HEATSINK/GND DISCONNECT * T1 T2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 T6 T5 N.C. N.C. HEATSINK/GND HEATSINK/GND HEATSINK/GND HEATSINK/GND N.C. VTERM T4 T3 PWP PACKAGE (Top View) * Pin 10 is DISCONNECT for the LX5112A, and DISCONNECT for the LX5111A. 2 Copyright © 1999 Rev. 0.1 3/99 PRODUCT DATABOOK 1996/1997 UltraMAX U LT R A 9 - CHANNEL S C S I TE R M I N ATOR P RELIMINARY LX5111A/5112A D ATA S HEET R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter Termination Voltage High Level Enable Input Voltage Low Level Disable Input Voltage Operating Virtual Junction Temperature Range LX5111AC/5112AC Note 2. Range over which the device is functional. (Note 2) Symbol VTERM VIH VIL Recommended Operating Conditions Min. Typ. Max. 3.0 2.5 0 0 2.5 0 5.5 VTERM 0.8 0.8 VTERM 125 Units V V V V V °C LX5111A LX5112A LX5111A LX5112A ELECTRICAL CHARACTERISTICS Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25°C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature. Parameter Output High Voltage TermPwr Supply Current LX5111A LX5112A Output Current DISCONNECT Input Current DISCONNECT Input Current Output Leakage Current LX5111A LX5112A Symbol VOUT ICC Test Conditions Term Power = 4.75V Term Power = 3.0V All data lines = open All data lines = 0.5V DISCONNECT Pin < 0.8V DISCONNECT Pin > 2.0V VOUT = 0.5V, Term Power = 4.75V VOUT = 0.5V, Term Power = 3.0V DISCONNECT Pin = 4.75V DISCONNECT Pin = 0V DISCONNECT Pin = 0V DISCONNECT Pin = 4.75V DISCONNECT Pin = < 0.8V, V O = 0.5V DISCONNECT Pin = > 2.0V, V O = 0.5V VOUT = 0V, frequency = 1MHz VOUT = 4V LX5111A/5112A Min. Typ. Max. 2.65 2.1 2.82 2.2 5 205 275 275 -23 -18 10 40 -14 10 10 10 3 35 11 Units V V mA mA µA µA mA mA nA µA µA nA nA nA pF MHz mA 9 225 IOUT IIN IIN IOL COUT BW I SINK -21 -17 -24 LX5111A LX5112A Capacitance in DISCONNECT Mode Channel Bandwidth Termination Sink Current, per Channel 7 Copyright © 1999 Rev. 0.1 3/99 3 PRODUCT DATABOOK 1996/1997 LX5111A/5112A U LT R A 9 - CHANNEL S C S I TE R M I N ATOR P RELIMINARY UltraMAX D ATA S HEET BLOCK DIAGRAM TERM POWER CURRENT BIASING CIRCUIT 24mA CURRENT LIMITING CIRCUIT DATA OUTPUT PIN DB(0) 2.85V DISCONNECT (5111) DISCONNECT (5112) 1.4V 1 OF 9 CHANNELS FUNCTIONAL DESCRIPTION Cable transmission theory suggests to optimize signal speed demands by delivering 24mA on assertion, and by imposing and quality, the termination should act both as an ideal voltage 2.85V on deassertion. In order to disable the device, the reference when the line is released (deasserted) and as an ideal DISCONNECT pin (DISCONNECT pin for the LX5112A) must current source when the line is active (asserted). Common be driven logic Low (logic High for the LX5112A). This mode active terminators, which consist of Linear Regulators in series of operation places the devices in a sleep state where a meager with resistors (typically 110Ω), are 275µA of quiescent current is conPOWER UP / POWER DOWN FUNCTION T ABLE a compromise. As the line voltage sumed. Additionally, all outputs are increases, the amount of current LX5111A LX5112A Quiescent in a Hi-Z (impedance) state. Sleep Outputs decreases linearly by the equation mode can be used for power conDISCONNECT DISCONNECT Current V = I * R. The LX5111A/5112A, with servation or to completely eliminate their unique new architecture apthe terminator from the SCSI chain. H L Enabled 6mA plies the maximum amount of In the second case, termination L H HI Z 275µA current regardless of line voltage node capacitance is important to Open Open HI Z 275µA until the termination high threshold consider. The terminators will ap(2.85V) is reached. pear as a parasitic distributed capaciActing as a near ideal line terminators, the LX5111A/5112A tance on the line, which can detract from bus performance. For closely reproduce the optimum case when the devices are this reason, the LX5111A/5112A have been optimized to have enabled. To enable the device the DISCONNECT pin only 3pF of capacitance per output in the sleep state. (DISCONNECT pin for the LX5112A) must be pulled logic High An additional feature of the LX5111A/5112A IC's are their (logic Low for the LX5112A). During this mode of operation, compatibility with active negation drivers. quiescent current is 6mA and the devices will respond to line UltraMAX is a trademark of Linfinity Microelectronics Inc. PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only, and Linfinity reserves the right to change or discontinue this proposed product at any time. 4 Copyright © 1999 Rev. 0.1 3/99