LX5111A 5112A ULTRA 9-CHANNEL SCSI TERMINATOR DESCRIPTION

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LX5111A 5112A ULTRA 9-CHANNEL SCSI TERMINATOR DESCRIPTION

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UltraMAX
LX5111A 5112A
ULTRA 9-CHANNEL SCSI TERMINATOR
DESCRIPTION
LX5111A/5112A SCSI terminators part Linfinity's UltraMAX family highperformance, adaptive, non-linear mode SCSI products, which designed deliver true UltraSCSI performance SCSI applications. voltage BiCMOS architecture employed their design offers superior performance older linear passive active techniques. Linfinity's UltraMAX architecture employs high-speed adaptive elements each channel, thereby providing fastest response possible typically 35MHz, which times faster than older linear regulator/terminator approach used other manufacturers. Products using this older linear regulator approach have bandwidths which dominated output capacitor which limited 500KHz (see further discussion Functional Description section). UltraMAX architecture also eliminates output compensation capacitor typical earlier terminator designs. Each approved with SCSI-1, UltraSCSI beyond providing highest performance alternative available today. Another improvement offered LX5111A/12A lies their ability insure reliable, error-free communications even systems which adhere recommended SCSI hardware design guidelines, such improper cable lengths impedances. Frequently, this situation controlled peripheral host designer and, when problems occur, they first made aware problem. LX5111A/12A architecture much more tolerant marginal system integrations. Recognizing needs portable configurable peripherals, LX5111A/12A have compatible sleep/disable mode. Quiescent current typically less than 275µA this mode, while output capacitance also less than 3pF. obvious advantage extended battery life portable systems inherent product's sleep-mode feature. Additionally, disable function permits factory-floor production-line configurability, reducing inventory product line diversity costs. Field configurability also accomplished without physically removing components which, often times results field returns mishandling. Reduced component counts also inherent LX5111A/12A's architecture. Traditional termination techniques require large stabilization transient protection capacitors 20µF value size. LX5111A/12A architecture does require these components, allowing cost savings associated with inventory, board space, assembly, reliability, component costs.
FEATURES
Ultra-Fast Response FAST20 SCSI Applications 35MHz Channel Bandwidth 3.0V Operation Less Than Output Capacitance Thermally Self-Limiting External Compensation Capacitors Implements 8-bit 16-bit Wide) Applications Compatible with Active Negation Drivers Compatible With Passive Active Terminations Approved With SCSI Ultra SCSI Hot-Swap Compatible Pin-For-Pin Compatible With LX5211 UC5606 (LX5111) Pin-For-Pin Compatible With LX5212 UC5603/5613/5614 (LX5112)
IMPORTANT: most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGH
(°C)
PACKAGE ORDER INFO Plastic TSSOP Plastic SOIC 24-Pin, Power 16-Pin, Power LX5111ACDP LX5112ACDP LX5111ACPWP LX5112ACPWP
ROHS Compliant Pb-free transition 0440
Note: Available Tape Reel. Append letters "TR" part number. (i.e. LX5111ACDP-TR)
Copyright 1999 Rev. 0.2a,2005-03-10
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, 92841, 714-898-8121, FAX: 714-893-2570
PRODUCT DATABOOK 1996/1997
LX5111A/5112A
CHANNEL ATOR
UltraMAX
(Note
PACKAGE OUTS
HEATSINK/GND DISCONNECT
TermPwr Voltage Signal Line Voltage Regulator Output Current 0.4A Operating Junction Temperature Plastic (DP, Packages) 150°C Storage Temperature Range -65°C 150°C Lead Temperature (Soldering, seconds) 300°C
Peak Packge Solder Reflow Temp. second max. exposure). 260°C (+0, Note Exceeding these ratings could cause damage device. voltages with respect Ground. Currents positive into, negative specified terminal.
N.C. HEATSINK/GND HEATSINK/GND VTERM
PACKAGE (Top View)
RoHS Pb-free 100% Matte Lead Finish
N.C. HEATSINK/GND HEATSINK/GND HEATSINK/GND HEATSINK/GND DISCONNECT N.C. N.C. HEATSINK/GND HEATSINK/GND HEATSINK/GND HEATSINK/GND N.C. VTERM
PACKAGE: THERMAL RESISTANCE-JUNCTION LEADS, THERMAL RESISTANCE-JUNCTION AMBIENT, PACKAGE: THERMAL RESISTANCE-JUNCTION LEADS, THERMAL RESISTANCE-JUNCTION AMBIENT, 27°C/W 100°C/W 20°C/W 50°C/W
Junction Temperature Calculation: JA). numbers guidelines thermal performance device/pc-board system. above assume ambient airflow.
PACKAGE (Top View)
DISCONNECT LX5112A, DISCONNECT LX5111A.
Copyright 1999 Rev. 0.2a 11/04
PRODUCT DATABOOK 1996/1997
UltraMAX
CHANNEL ATOR
LX5111A/5112A
Parameter
Termination Voltage High Level Enable Input Voltage Level Disable Input Voltage Operating Virtual Junction Temperature Range LX5111AC/5112AC Note Range over which device functional.
(Note
Symbol
VTERM
Recommended Operating Conditions Min. Typ. Max.
VTERM VTERM
Units
LX5111A LX5112A LX5111A LX5112A
ELECTRICAL CHARACTERISTICS
Term Power 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply recommended operating ambient temperature 25°C. duty cycle pulse testing techniques used which maintains junction case temperatures equal 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
Test Conditions
Term Power 4.75V Term Power 3.0V data lines open data lines 0.5V DISCONNECT 0.8V DISCONNECT 2.0V VOUT 0.5V, Term Power 4.75V VOUT 0.5V, Term Power 3.0V DISCONNECT 4.75V DISCONNECT DISCONNECT DISCONNECT 4.75V DISCONNECT 0.8V, 0.5V DISCONNECT 2.0V, 0.5V VOUT frequency 1MHz VOUT
LX5111A/5112A Min. Typ. Max.
2.65 2.82
Units
IOUT COUT SINK
LX5111A LX5112A Capacitance DISCONNECT Mode Channel Bandwidth Termination Sink Current, Channel
Copyright 1999 Rev. 0.2a 11/04
PRODUCT DATABOOK 1996/1997
LX5111A/5112A
CHANNEL ATOR
UltraMAX
BLOCK DIAGRAM
TERM POWER
CURRENT BIASING CIRCUI
24mA CURRENT LIMITING CIRCUI
DATA OUTPUT DB(0)
2.85V
DISCONNECT (5111) DISCONNECT (5112)
1.4V CHANNELS
FUNCTIONAL DESCRIPTION Cable transmission theory suggests optimize signal speed demands delivering 24mA assertion, imposing quality, termination should both ideal voltage 2.85V deassertion. order disable device, reference when line released (deasserted) ideal DISCONNECT (DISCONNECT LX5112A) must current source when line active (asserted). Common driven logic (logic High LX5112A). This mode active terminators, which consist Linear Regulators series operation places devices sleep state where meager with resistors (typically 110), 275µA quiescent current conPOWER POWER DOWN FUNCTION ABLE compromise. line voltage sumed. Additionally, outputs increases, amount current LX5111A LX5112A Quiescent Hi-Z (impedance) state. Sleep Outputs decreases linearly equation mode used power conDISCONNECT DISCONNECT Current LX5111A/5112A, with servation completely eliminate their unique architecture apthe terminator from SCSI chain. Enabled plies maximum amount second case, termination 275µA current regardless line voltage node capacitance important Open Open 275µA until termination high threshold consider. terminators will ap(2.85V) reached. pear parasitic distributed capaciActing near ideal line terminators, LX5111A/5112A tance line, which detract from performance. closely reproduce optimum case when devices this reason, LX5111A/5112A have been optimized have enabled. enable device DISCONNECT only capacitance output sleep state. (DISCONNECT LX5112A) must pulled logic High additional feature LX5111A/5112A IC's their (logic LX5112A). During this mode operation, compatibility with active negation drivers. quiescent current devices will respond line
UltraMAX trademark Linfinity Microelectronics Inc.
PRELIMINARY DATA Information contained this document pre-production data, proprietary LinFinity. modified without express written consent LinFinity. Product referred herein offered sample form only, Linfinity reserves right change discontinue this proposed product time.
Copyright 1999 Rev. 0.2a 11/04

LX5111A 5112A ULTRA 9-CHANNEL SCSI TERMINATOR DESCRIPTION

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