CALIFORNIA MICRO DEVICES
PACRAMBUS-1
HIGH PERFORMANCE RAMBUS聶 TERMINATION NETWORK
FOR RIMM聶 CONNECTOR
Features
聲 2 chip solution for all Rambus聶 load
terminations, in 20-pin QSOP narrow package
聲 14 Terminations in a single package
聲 1% absolute tolerance 28 ohms
terminations across temperature range
聲 Center ground pin placement reduces
ground bounce and eases board layout
聲 Very low cross-talk
聲 Saves board space and reduces assembly cost
Product Description
Applications
聲 Rambus聶 Memory System
The Direct Rambus聶 memory interface transfers data at both edges of a 400MHz clock resulting in an 800MHz transfer rate.
The Rambus聶 channel uses a memory controller on one end of the bus, terminations at the other end, and the RIMM聶
modules in between. The Rambus聶 channel contains control signals and data bus lines that must be terminated in order to
prevent any reflections. California Micro Devices聮 PAC聶 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 silicon-
based and has the same reliability characteristics as any of today聮s 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擄 to 70擄C)
TCR
Operating Temperature Range
Power Rating/Resistor
Max Package Power Rating (70擄C)
Cross Talk
R(
鈩?/div>
)
28
O
28 Ohms
鹵1%
鹵150ppm
0擄C to 70擄C
40mW
1.00W
TB D
C
E
J
B
I
T
E
V
SCHEMATIC
Code
280
漏 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
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