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| CALIFORNIA MICRO DEVICES PACRAMBUS-1 HIGH PERFORMANCE RAMBUS TERMINATION NETWORK FOR RIMM CONNECTOR Features 2 chip solution for all Rambus load terminations, in 20-pin QSOP narrow package 14 Terminations in a single package 1% absolute tolerance 28 ohms terminations across temperature range Center ground pin placement reduces ground bounce and eases board layout Very low cross-talk Saves board space and reduces assembly cost Product Description Applications Rambus Memory System The Direct Rambus memory interface transfers data at both edges of a 400MHz clock resulting in an 800MHz transfer rate. The Rambus channel uses a memory controller on one end of the bus, terminations at the other end, and the RIMM modules in between. The Rambus channel contains control signals and data bus lines that must be terminated in order to prevent any reflections. California Micro Devices PAC RAMBUS-1 integrates fourteen 28-ohm resistors specified at 1% absolute tolerance across the commercial temperature range. This termination network provides high performance, high reliability, and low cost through manufacturing efficiency. The termination resistor elements are fabricated using state-of-the-art thin film manufacturing. This integrated solution is siliconbased and has the same reliability characteristics as any of todays microprocessor products. The thin film resistors have very high stability over temperature, over applied voltage, and over life. In addition, the QSOP industry standard packaging is easy to handle in manufacturing and yields a high reliability similar to other semiconductor components. STANDARD SPECIFICATIONS Resistor (R) Absolute Tolerance (R) (0 to 70C) TCR Operating Temperature Range Power Rating/Resistor Max Package Power Rating (70C) Cross Talk R() 28 O 28 Ohms 1% 150ppm 0C to 70C 40mW 1.00W TB D J B C E I T E V SCHEMATIC Code 280 (c) 2000 California Micro Devices Corp. All rights reserved. 4/00 C0470199 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 1 CALIFORNIA MICRO DEVICES The following lines must be terminated: DQA[8:0]: Data bus A, DQB[8:0]: Data bus B, CFM, CFMN: Clock From Master (positive and negative polarity), ROW[2:0]: Row bus, COL[4:0]: Column bus. PACRAMBUS-1 STANDARD PART ORDE RING INFORMATION Ordering Part Number Pins Style Tubes Tape & Reel Part Marking RECOMMENDEDwLAYOUTCRAMBUS-1/T 20 QSOP Narro PA (PAC RAM-280) FOR MBUS-1/R PACRA RAMBUS RIMMACRAMBUS-1 P CONNECTOR Package O J B C E I T E V (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 4/00 CALIFORNIA MICRO DEVICES PACRAMBUS-1 QSOP - TOP VIEW POWER DERATING CURVE H CAMD 1 EH D e B A C L A1 Lead Plating Lead Material Lead Coplanarity Substrate Material Body Material Flammability MECHANICAL SPECIFICATIONS Tin-Lead Copper Alloy 0.004" (0.102mm) Silicon Molded Epoxy UL94V-0 PACKAGE DIME NSIONS, POWE R DISSIPATION & iNFORMATION Package Pins # QSOP 20 inches m ax 1.75 0.25 0.30 0.25 8.73 3.98 6.19 1.27 1.00W 56 pcs 2,500 pcs min 0.053 0.004 0.008 0.007 0.337 0.150 0.025 BSC 0.228 0.016 0.244 0.050 m ax 0.069 0.010 0.012 0.010 0.344 0.157 A A1 B C D E e H L PD @ 70C #/tube #/tape & reel O min 1.35 0.10 0.20 0.18 8.56 3.81 5.79 0.40 J B mm C E I T E V 0.64 BSC (c) 2000 California Micro Devices Corp. All rights reserved. 4/00 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 3 |
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