PRN299 Datasheet, PDF (1/3 Pages) California Micro Devices Corp – POSITIVE/POEUDO ECL(PECL)CLOCK TERMINATION NETWORK

CALIFORNIA MICRO DEVICES
PRN299
POSITIVE / PSEUDO ECL (PECL) CLOCK TERMINATION NETWORK
Features
• Stable resistor network
• Reduces power dissipation on the clock lines
• Ideal for high-speed clock termination
• Reduces board space by 70% vs. 1206 discretes
and component count by more than 50%
Applications
• PECL clock termination
Application Note
High speed microprocessors line Intel’s Pentium/P6®, Apple PowerPC®, SPARC® and other CISC and RISC based systems need
well-controlled and precise clock signals to maintain a synchronous systems. The fast edge rated clock signals will exhibit
transmission line effects on the clock lines resulting in undershoots and overshoots. The integrated PECL termination is
designed to suppress the undershoots and overshoots on the clock lines. The PECL RC terminator dissipates very low power
compared to the resistor termination network.
Why thin.film R networks? The PECL termination is an integrated R network fabricated on a silicon substrate using
advanced thin film technology. This will have a fixed time constant and will not create additional skew on the clock lines. It
has a low parasitic inductance compared to discrete and conventional thick film R terminators and provide effective termination
at high frequencies.
STANDARD VALUES
R₁ (Ω) ± 1%
50
R₂ (Ω) ± 1%
50
R₃ (Ω) ± 1%
46.4
SCHEMATIC DIAGRAM
STANDARD PART ORDERING INFORMATION
Package
Ordering Part Number
Pins
Style
Part Marking
3
SOT-23
PRN299
When placing an order please specify desired shipping: Tubes or Tape & Reel.
© 2000 California Micro Devices Corp. All rights reserved. PAC VGA200™ is a trademark of California Micro Devices Corp.
3/00
215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com
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