CALIFORNIA MICRO DEVICES
PRC298/299
Clock Terminator
Features
• Stable resistor-capacitor network
• Ideal for high-speed logic
• Low lead inductance
• Reduces board space compared to discretes
• SOT Packages
Application
• Clock termination
Product Description
High speed microprocessors like Intel’s Pentium
®
, DEC’s
Alpha, Motorola’s 68K and PowerPC, Sun’s SPARC,
MIPs, and other RISC-based systems require well-
controlled and precise clock signals to maintain a high
performance synchronous system. However, very fast
edge rated clock signals exhibit transmission line effects
on the clock lines resulting in undershoot and overshoot
disturbances.
CAMD’s PRC298/299 SOT resistor-capacitor integrated
thin film networks are specifically designed to eliminate
transmission line effects on high speed clock and data
lines.
These networks are fabricated on a silicon substrate
using advanced thin film technology. They have low
parasitic inductance compared to discrete and conven-
tional thick film filters and provide effective AC termina-
tion.
Why thin film RC networks? The PRC298/299 is an
integrated RC network fabricated on a silicon substrate
using advanced thin film technology. This technology
insures a fixed time constant and does not create
additional skew on the clock lines. It offers very low
parasitic inductance compared to conventional discrete
thick film-based approaches and provides effective
termination at high frequencies.
SCHEMATIC CONFIGURATIONS
2
R
C
3
R
C
C
R
C
R
1
3
PRC299
(SOT-23)
C
R
2
1
4
PRC298
(SOT-143)
© 2001 California Micro Devices Corp. All rights reserved.
C1730201
215 Topaz Street, Milpitas, California 95035
2/28/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
PRC298/299
California Micro Devices can develop a fully customized solution which embodies the configuration shown in this data
sheet or modified to suit specific application requirements. A Non-Recurring Engineering (NRE) charge will apply for
all fully customized requirements and a minimum order/lot will be required.
Please direct your detailed circuit configuration and specification requirements to your local CAMD representative or to
the factory for a quotation.
STANDARD SPECIFICATIONS
Resistance Range
Capacitance Range
Absolute Tolerance (R)
Absolute Tolerance (C)
Operating Temperature Range
Power Rating/Resistor
Storage Temperature
Package Power Rating
15 to 100Ω
10 to 100pF
±10%
±20%
–55°C to 125°C
100mW
–60°C to 150°C
1W, MAX
TYPICAL VALUES
Part Number
PRC298
PRC298
PRC298
PRC298
PRC298
PRC298
PRC298
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
PRC299
33Ω
47Ω
47Ω
50Ω
75Ω
100Ω
40Ω
33Ω
47Ω
47Ω
50Ω
75Ω
100Ω
40Ω
50Ω
50Ω
47Ω
50Ω
33Ω
Resistor
Value (Ω)
Tolerance
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±10%
±5%
±20%
±5%
Capacitor
Value (pF)
47pF
47pF
33pF
68pF
50pF
100pF
50pF
47pF
47pF
33pF
68pF
50pF
100pF
50pF
100pF
68pF
47pF
100pF
47pF
Tolerance
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±20%
±10%
±20%
±20%
±20%
Breakdown
Voltage (MAX)
25V
25V
25V
25V
25V
10V
25V
45V
45V
45V
45V
45V
10V
45V
10V
45V
45V
10V
45V
©2001 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
2/28/2001
CALIFORNIA MICRO DEVICES
PRC298/299
Part Number Key
PRC289
PRC299 XXX M / XXX M
Part Series
Resistance Code
• First 2 digits are
significant value
• Third digit represents
number of zeros to follow
e.g., code for 56Ω is 560
Resistor Tolerance
J = ±5%
K = ±10%
M = ±20%
Capacitor Tolerance
K = ±10%
M = ±20%
Capacitance Code
• First 2 digits are significant
value.
• Third digit represents
number of zeros to follow
e.g., code for 68pF is 680.
© 2001 California Micro Devices Corp. All rights reserved.
215 Topaz Street, Milpitas, California 95035
2/28/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
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