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PulseCore Semiconductor

PCS3P623Z09A Datasheet Preview

PCS3P623Z09A Datasheet

Timing-Safe Peak EMI reduction IC

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May 2008
rev 0.1
PCS3P623Z05A/B
PCS3P623Z09A/B
Timing-Safe™ Peak EMI reduction IC
General Features
Clock distribution with Timing-Safe™ Peak EMI
Reduction
Input frequency range: 20MHz - 50MHz
Multiple low skew Timing-safe™ Outputs:
PCS3P623Z05: 5 Outputs
PCS3P623Z09: 9 Outputs
External Input-Output Delay Control option
Supply Voltage: 3.3V±0.3V
Commercial and Industrial temperature range
Packaging Information:
ASM3P623Z05: 8 pin SOIC, and TSSOP
ASM3P623Z09:16 pin SOIC, and TSSOP
True Drop-in Solution for Zero Delay Buffer,
ASM5P2305A / 09A
Functional Description
PCS3P623Z05/09 is a versatile, 3.3V Zero-delay buffer
www.DataSheet4U.com
designed to distribute Timing-Safe™ clocks with Peak EMI
reduction. PCS3P623Z05 is an eight-pin version, accepts
one reference input and drives out five low-skew Timing-
Safe™ clocks. PCS3P623Z09 accepts one reference input
and drives out nine low-skew Timing-Safe™clocks.
PCS3P623Z05/09 has a DLY_CTRL for adjusting the
Input-Output clock delay, depending upon the value of
capacitor connected at this pin to GND.
PCS3P623Z05/09 operates from a 3.3V supply and is
available in two different packages, as shown in the
ordering information table, over commercial and Industrial
temperature range.
Application
PCS3P623Z05/09 is targeted for use in Displays and
memory interface systems.
General Block Diagram
CLKIN
PLL
PCS3P623Z05A/B
DLY_CTRL
CLKOUT1 CLKIN
CLKOUT2
PLL
MUX
CLKOUT3
CLKOUT4
S2
S1
Select Input
Decoding
PCS3P623Z09A/B
DLY_CTRL
CLKOUTA1
CLKOUTA2
CLKOUTA3
CLKOUTA4
CLKOUTB1
CLKOUTB2
CLKOUTB3
CLKOUTB4
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.




PulseCore Semiconductor

PCS3P623Z09A Datasheet Preview

PCS3P623Z09A Datasheet

Timing-Safe Peak EMI reduction IC

No Preview Available !

May 2008
rev 0.1
Spread Spectrum Frequency Generation
The clocks in digital systems are typically square waves
with a 50% duty cycle and as frequencies increase the
edge rates also get faster. Analysis shows that a square
wave is composed of fundamental frequency and
harmonics. The fundamental frequency and harmonics
generate the energy peaks that become the source of
EMI. Regulatory agencies test electronic equipment by
measuring the amount of peak energy radiated from the
equipment. In fact, the peak level allowed decreases as
the frequency increases. The standard methods of
reducing EMI are to use shielding, filtering, multi-layer
Zero Delay and Skew Control
All outputs should be uniformly loaded to achieve Zero
Delay between input and output. Since the DLY_CTRL pin
is the internal feedback to the PLL, its relative loading can
adjust the input-output delay.
Timing-Safe™ technology
Timing-Safe™ technology is the ability to modulate a
clock source with Spread Spectrum technology and
maintain synchronization with any associated data path.
PCS3P623Z05A/B
PCS3P623Z09A/B
PCBs etc. These methods are expwenwswive.D. atSapSrheeaedt4U.com
spectrum clocking reduces the peak energy by reducing
the Q factor of the clock. This is done by slowly
modulating the clock frequency. The PCS3P623Z05/09
uses the center modulation spread spectrum technique in
which the modulated output frequency varies above and
below the reference frequency with a specified
modulation rate. With center modulation, the average
frequency is the same as the unmodulated frequency and
there is no performance degradation
For applications requiring zero input-output delay, all
outputs, including DLY_CTRL, must be equally loaded.
Even if DLY_CTRL is not used, it must have a capacitive
load equal to that on other outputs, for obtaining zero-
input-output delay.
.
Timing-Safe™ Peak EMI Reduction IC
Notice: The information in this document is subject to change without notice.
2 of 15


Part Number PCS3P623Z09A
Description Timing-Safe Peak EMI reduction IC
Maker PulseCore Semiconductor
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PCS3P623Z09A Datasheet PDF






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