CALIFORNIA MICRO DEVICES
PRN299
Applications
POSITIVE / PSEUDO ECL (PECL) CLOCK TERMINATION NETWORK
Features
聲
聲
聲
聲
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%
聲 PECL clock termination
Application Note
High speed microprocessors line Intel聮s Pentium/P6廬, Apple PowerPC廬, SPARC廬 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
R
1
(鈩?/div>
)
鹵
1%
鈩?/div>
50
R
2
(鈩?/div>
)
鹵
1%
鈩?/div>
50
R
3
(鈩?/div>
)
鹵
1%
鈩?/div>
46.4
SCHEMATIC DIAGRAM
Pins
3
ST
ANDAR
D PART ORDE RING INFORMATION
Package
Ordering Part Number
Style
Part Marking
SOT-23
P R N 299
When placing an order please specify desired shipping: Tubes or Tape & Reel.
漏 2000 California Micro Devices Corp. All rights reserved. PAC VGA200聶 is a trademark of California Micro Devices Corp.
3/00
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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