LIN D O C #: 5121 TM UltraMAX ULTRA 27-L I N E , P L U G T H E I N F I N I T E P O W E R O F I P N N O VA T I O N AND R O D U C T I O N DESCRIPTION The LX5121 Plug and Play UltraMAXTM terminator represents next-generation technology for SCSI termination applications. The lowvoltage BiCMOS architecture employed in its design offers superior performance to older passive and active techniques. Linfinity's architecture employs high-speed adaptive elements for each channel, providing the fastest response possible. The channel bandwidth is typically 35MHz. The LX5121 compares favorably to older linear regulator approaches whose bandwidth's are dominated by the output compensation capacitor and are limited to the 500KHz bandwidth region (see further discussion in the Functional Description section). Linfinity's architecture also eliminates the output compensation capacitor typical in earlier terminator designs. Each is approved for use with SCSI-1,-2,-3, ULTRA and beyond — providing the highest performance alternative available today. Another key improvement of LX5121 products lies in their ability to ensure reliable, errorfree communications even in systems which do not necessarily adhere to recommended SCSI hardware design guidelines, such as the use of improper cable lengths and imped- LX5121 P LAY SCSI T ERMINATOR D A T A S H E E T K E Y F E AT U R E S ances. 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 these problems. The LX5121 architecture is much more tolerant of marginal system integrations. Recognizing the needs of portable and configurable peripherals, the LX5121 has a TTL compatible sleep/disable mode. Typically, quiescent current is less than 150µA in this mode. Reduced component count is also inherent in the LX5121 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20µF in value and size. The LX5121 architecture does not require these components, allowing all the cost savings associated with inventory, board space, assembly, reliability, and component costs. The LX5121 has multiple disables for full Plug and Play SCSI capability for Host Bus Adapters with 3 SCSI connectors. It also splits the upper 9 termination lines for mixing 16bit (wide) and 8-bit (narrow) buses with minimal board trace capacitance. ■ Ultra-Fast Response For Fast-20 SCSI Applications ■ Plug And Play SCSI For Host Bus Adapters With 3 SCSI Connectors ■ Split Disconnect For Mixing 16-Bit (Wide) Or 8-Bit (Narrow) Buses ■ 35mhz Channel Bandwidth ■ Sleep-Mode Current Less Than 150µA ■ Hot-Swap Compatible ■ NO External Compensation Capacitors ■ Compatible With Active Negation Drivers ■ Superior Pin-for-Pin Replacement For The UCC5621 NOTE: For current data & package dimensions, visit our web site: http://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 Driver Receiver 1 Meter, AWG 28 LX5121 LX5121 LX5268 LX5268 PA C K A G E O R D E R I N F O TJ (°C) 0 to 125 SSOP DB Plastic 44-pin NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus" LX5121CDB Note: Available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5121CDBT) Copyright © 1999 Rev. 1.0 5/99 LINFINITY MICROELECTRONICS INC. 11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570 1 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX LX5121 ULTRA 27-L I N E , P L U G P AND R O D U C T I O N A B S O L U T E M A X I M U M R AT I N G S P LAY SCSI T ERMINATOR D A T A S H E E T PA C K A G E P I N O U T S (Note 1) TermPwr Voltage ..................................................................................................... 7V Continuous Output Voltage Range .............................................................. 0 to 5.5V Continuous Disable Voltage Range .............................................................. 0 to 5.5V Operating Junction Temperature Plastic (DB Packages) .................................................................................... 150ºC Storage Temperature Range ............................................................. -65°C to +150°C Solder Temperature (Soldering, 10 seconds) ................................................... 300°C T19 T20 T1 T2 W1 W2 T3 T4 T5 GND GND GND GND DISC1 DISC2 T6 T7 T8 T9 T10 T21 T22 Note 1. Exceeding these ratings could cause damage to the device. T H E R M A L D ATA DB PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 50°C/W Junction Temperature Calculation: TJ = T A + (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. 1 44 2 43 3 42 4 41 5 40 6 39 7 38 8 37 9 36 10 35 11 34 12 33 13 32 14 31 15 30 16 29 17 28 18 27 19 26 20 25 21 24 22 23 T27 T26 T25 T18 N1 T17 T16 T15 N.C. GND GND GND GND VT T14 T13 T12 N.C. N.C. T11 T24 T23 DB PACKAGE (Top View) 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 Symbol Termination Voltage High Level Disable Input Voltage Low Level Disable Input Voltage Operating Virtual Junction Temperature Range LX5121C VTERM VIH VIL (Note 2) Recommended Operating Conditions Min. Typ. Max. Units 4.0 2 0 5.5 VTERM 0.8 V V V 0 125 °C Note 2. Range over which the device is functional. 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 Symbol Output High Voltage TermPwr Supply Current Output Current Disable Input Current VOUT ICC DISC1 DISC2 Output Leakage Current Channel Bandwidth Termination Sink Current, per Channel 2 IOUT IIN BW ISINK Test Conditions Min. 2.65 All data lines = open All data lines = 0.2V Disable Pins 1 & 2 < 0.8V VOUT = 0.2V DISC1 = 0V DISC2 = 0V DISC1 and DISC2= < 0.8V, VO = 0.2V -20 LX5121 Typ. Max. 2.85 12 635 50 -22 35 VOUT = 4V 7 20 670 150 -24 -10 -10 1 Units V mA mA µA mA µA µA µA MHz mA Copyright © 1999 Rev. 1.0 5/99 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX LX5121 ULTRA 27-L I N E , P L U G P AND R O D U C T I O N P LAY SCSI T ERMINATOR D A T A S H E E T BLOCK DIAGRAM TERM POWER CURRENT BIASING CIRCUIT VCC DISC1 24mA CURRENT LIMITING CIRCUIT DATA OUTPUT PIN DB(0) VCC 2.85V DISC2 1.4V 1 OF 27 CHANNELS FUNCTIONAL DESCRIPTION Cable transmission reproduces the optiPOWER UP / POWER DOWN FUNCTION TABLE theory suggests that in mum case when the DISC1 DISC2 W1 W2 N1 T1-T18 T19-T27 order to optimize sigdevice is enabled. To nal speed and quality, enable the device the H L DC DC DC Enabled Disabled the termination DISC1 and DISC2 pins L H DC DC DC Disabled Enabled should act both as an must be driven per the ideal voltage referabove table. During L L DC DC DC Disabled Disabled ence when the line is this mode of operation, H H H H H Enabled Enabled released (de-asserted) quiescent current is H H H H L Enabled Enabled and as an ideal current 12mA and the device H H H L H Enabled Enabled source when the line will respond to line deH H H L L Disabled Enabled is active (asserted). mands by delivering Common active termi24mA on assertion and H H L H H Enabled Enabled nators, which consist by imposing 2.85V on H H L H L Disabled Enabled of Linear Regulators in de-assertion. Disable H H L L H Disabled Disabled series with resistors mode places the device H H L L L Disabled Disabled (typically 110Ω), are a in a sleep state, where compromise. As the a meager 150µA of quiline voltage increases, the amount of current decreases linearly escent current is consumed. Additionally, all outputs are in by the equation V = I * R. The UltraMAX LX5121, with its a Hi-Z (impedance) state. Sleep mode can be used for power unique new architecture, applies the maximum amount of conservation or to completely eliminate the terminator from current regardless of line voltage until the termination high the SCSI chain. threshold (2.85V) is reached. An additional feature of the LX5121 is its compatibility with Acting as a near ideal line terminator, the LX5121 closely active negation drivers. Copyright © 1999 Rev. 1.0 5/99 3 P R O D U C T D ATA B O O K 1 9 9 6 / 1 9 9 7 UltraMAX LX5121 ULTRA 27-L I N E , P L U G P AND R O D U C T I O N P LAY SCSI T ERMINATOR D A T A S H E E T P L U G A N D P L AY S C S I D I A G R A M Internal Narrow Internal Wide External Wide LX5121 For Plug and Play SCSI auto-termination diabling, connect pin 50 of the External Wide SCSI connector to W1 of the LX5121, connect pin 50 of the Internal Wide SCSI connector to W2 of the LX5121, and connect pin 22 of the Internal Narrow connector to N1 of the LX5121. UltraMAX is a trademark of Linfinity Microelectronics Inc. PRODUCTION DATA - Information contained in this document is proprietary to Lin Finity, and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. 4 Copyright © 1999 Rev. 1.0 5/99