PACRAMBUS-1 Datasheet, PDF (1/3 Pages) California Micro Devices Corp – HIGH PERFORMANCE RAMBUS TERMINATION NETWORK FOR RIMM CONNECTOR

CALIFORNIA MICRO DEVICES
PAC R A M B U S - 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
Applications
• Rambus™ Memory System
Product Description
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
E _{termination resistor elements are fabricated using state-of-the-art thin film manufacturing. This integrated solution is silicon-}
based and has the same reliability characteristics as any of today’s microprocessor products. The thin film resistors have very
V _{high stability over temperature, over applied voltage, and over life. In addition, the QSOP industry standard packaging is easy}
I to handle in manufacturing and yields a high reliability similar to other semiconductor components.
T _{STANDARD SPECIFICATIONS}
C _{Resistor (R)}
28 Ohms
Absolute Tolerance (R) (0° to 70°C) ±1%
E _TCR
±150ppm
Operating Temperature Range
0°C to 70°C
J _{Power Rating/Resistor}
40mW
Max Package Power Rating (70°C) 1.00W
B _{Cross Talk}
TBD
O ^R(Ω)
Code
SCHEMATIC
28
280
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