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| CALIFORNIA MICRO DEVICES PRN102/112 DUAL THEVENIN TERMINATION NETWORK Features * Stable resistor network * 18 terminating lines/package * Saves board space and reduces assembly cost Applications * SCSI termination * Thevenin termination Product Description Peripheral devices like disk drives, printers, and CD ROMs are connected to host through a special bus called SCSI (Small Computer System Interface). The fast edge rated signals that are transmitted through the SCSI cable generate ringing on the bus. This will slow down communication between host and peripherals. The SCSI standard recommends proper resistor (Thevenin) termination at host and peripheral locations to eliminate transmission line effects. CAMDs PRN102/112 Dual Thevenin Termination Networks offer high integration and performance in a miniature QSOP or SOIC package, which saves critical board area and provides manufacturing cost and reliability efficiencies. Why thin film resistor networks? A terminating resistor is used to reduce or eliminate unwanted reflections on a transmission line. It can perform this function only when its resistance value matches the characteristic impedance of the transmission line. The resistors used for terminating the transmission lines should be noiseless, stable and functional at high frequencies. Unlike thin film-based resistor networks, conventional thick film resistors used for terminating transmission lines are not stable over temperature and time and impose system performance limitations at very high frequencies. SCHEMATIC CONFIGURATION 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 S TA N D A R D S P E C I F I C AT I O N S TCR Operating Temperature Range Power Rating/Resistor Storage Temperature Package Power Rating 250ppm 0C to 70C 100mW -65C to +150C 1W, max. S TA N D A R D VA L U E S R1 () 220 R2 () 330 Code 221/331 N O N - S TA N D A R D VA L U E S Resistance Range Resistance Range R1 R2 170 to 660 110 to 440 N O N - S TA N D A R D S P E C I F I C AT I O N S Absolute Tolerance (R) 2% 1% (c) 2000 California Micro Devices Corp. All rights reserved. 7/14/2000 C1120600 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 1 CALIFORNIA MICRO DEVICES PRN102/112 S TA N D A R D PA R T O R D E R I N G I N F O R M AT I O N Package R Code 221/331 221/331 20 20 Package Pins Style SOIC QSOP Tubes PRN10220W221/331G/T PRN112 221/331G/T Ordering Part Number Tape & Reel PRN10220W221/331G/R PRN112 221/331G/R Part Marking PRN10220W221/331G PRN112 221/331G N O N - S TA N D A R D PA R T O R D E R I N G I N F O R M AT I O N PRN102 (Example) Part Series PRN102W-SOIC Wide PRN112-QSOP XXX/XXX Value Code R1 Code/R2 Code T Tolerance J = 5% G = 2% F = 1% California Micro Devices can develop a fully customized solution which embodies the configuration shown in this data sheet or modified to suit specific application requirements. Very precise TCR, TCR tracking and resistor tolerances, and resistor-to-resistor ratio matching can also be provided. A Non-Recurring Engineering (NRE) charge will apply for all fully customized requirements and a minimum order/lot will be required. Please direct your detailed circuit configuration and specification requirements to your local CAMD representative or to the factory for a quotation. (c)2000 California Micro Devices Corp. All rights reserved. 2 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 7/14/2000 |
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