pi6c3622-1 Pericom Semiconductor Corporation, pi6c3622-1 Datasheet

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pi6c3622-1

Manufacturer Part Number
pi6c3622-1
Description
Low Power Spread Spectrum Frequency Multiplier
Manufacturer
Pericom Semiconductor Corporation
Datasheet
Features
• 20 to 40MHz input frequency range
• 1x frequency multiplication
• Operating voltages of 2.5 V or 3.3V
• Selectable Spreading Ratio: ±0.30%, ±0.50%, ±0.70% and 0%
• Modulation Rate: Fin /640(20 MHz≤ Fin ≤40 MHz)
• Spread Spectrum feature can be enabled/disabled at run-time
• Low power dissipation
• Low jitter
• 8-pin TSSOP Package
Applications
The PI6C3622-1 can be used in most multimedia applications
and embedded systems including but not limited to the
following:
Block Diagram
typical at 27MHz input
and glitch-free
PDAs
DSCs
Printers/ MFPs
Media players
Portable-TVs
Embedded digital video devices
CD-ROM, VCD and DVD players
LCD Panel Modules
Automotive components
Networking devices
X1/CLKIN
X2
X’TAL
OSC
1/M
S1
S0
PFD
/CP
Modulation
1/N
LPF
SSON
VCO
CLKOUT
1/K
Low Power Spread Spectrum Frequency Multiplier
1
Description
The PI6C3622-1 is a Low Power Spread Spectrum Frequency
Multiplier and part of the Pericom SSCG-GP family. The part
generates one 1x modulated output from a single clock source or
a crystal, and is designed to reduce electromagnetic interference
(EMI) by spreading the clock. This reduction in EMI can result
in signifi cant system cost saving and less design complexity
by reducing the number of circuit board layers ferrite beads
and shielding. In the absence of a spread spectrum clock, other
EMI-reducing components are required in order to comply with
regulatory agency requirements.
The Spreading Ratio is selectable using the selection pins. The
PI6C3622-1 provides ±0.30%, ±0.50%, ±0.70% diversifi ed and
0% spread modulation through external logic stage setting. The
Spread Spectrum feature can be enabled and disabled at run-
time by setting the SSON pin. Other pins should be properly set
before the system is initialized.
The chip is packaged in the 8-pin TSSOP. The reduced size of
the package outlines can save precious board space and make
layout easier.
PI6C3622-1 is one of the clock products provided by Pericom.
If your application needs a clock product with a different
specifi cation not currently provided, please contact us for further
information or custom design.
Benefi ts
Pin Confi guration
Reduction in EMI
System cost saving
Reduced system complexity
Faster time to market
/CLKIN
SSON
X1
GND
S1
8 Pin
TSSOP
SSCG-GP Family
PI6C3622-1
PS8944A
X2
VDD
S0
CLKOUT
01/30/08

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pi6c3622-1 Summary of contents

Page 1

... The chip is packaged in the 8-pin TSSOP. The reduced size of the package outlines can save precious board space and make layout easier. PI6C3622-1 is one of the clock products provided by Pericom. If your application needs a clock product with a different specifi cation not currently provided, please contact us for further information or custom design. Benefi ...

Page 2

... S1,S0 = (1,0) S1,S0 = (1,1) SSON=1 SSON=1 Center (%) Center ±0.55 ±0.80 ±0.50 ±0.70 ±0.50 ±0.70 ±0.40 ±0.60 ±0.35 ±0.55 ±0.35 ±0.50 2 SSCG-GP Family Description S1,S0 = 0/1 SSON=1 SSON=0 No Spread 31.25~62 PI6C3622-1 Modulation Rate (KHz) /640 in /640 in /640 in /640 in /640 in /640 in PS8944A 01/30/08 ...

Page 3

... The transition of the frequency trend is glitch-free when the spread spectrum feature is enabled and disabled. The duty cycle of the output signals remains 50% during and after the transition. Figure 2 Zoomed-in view of frequency trend Low Power Spread Spectrum Frequency Multiplier 3 PI6C3622-1 SSCG-GP Family PS8944A 01/30/08 ...

Page 4

... Figure 3 Zoomed-in view of frequency trend Low Power Spread Spectrum Frequency Multiplier 4 PI6C3622-1 SSCG-GP Family PS8944A 01/30/08 ...

Page 5

... MHz≤ Fin ≤40 MHz 20 20 MHz≤ Fin ≤40 MHz 20 (S1,S0)=(0,1) (S1,S0)=(1,0) (S1,S0)=(1,1) (S1,S0)=(0/1, 0/1) Measured from 20% to – 80 15pF load. DD Measured from 80% to – 20 15pF load DD – PI6C3622-1 SSCG-GP Family Typ. Max Unit 2.5 2.625 V – – V – 0.8 V – – V – 0.6 V – 3.6 ...

Page 6

... MHz≤ Fin ≤40 20 MHz 20 MHz≤ Fin ≤40 20 MHz (S1,S0)=(1,0) (S1,S0)=(1,1) Measured from 20% to – 80 15pF load. DD Measured from 80% to – 20 15pF load DD – – PI6C3622-1 SSCG-GP Family Typ. Max Unit 3.3 3.6 V – – V – 0.8 V – – V – 0.5 V – 5 – ...

Page 7

... Ci). The typical CLtrim = 28pF when crystal load = 18pF, stray capacitance Cs = 3pF and XTAL pins capacitance = 5pF. Low Power Spread Spectrum Frequency Multiplier 0.1uF 1nF Strapping to low Crystal Ltrim 7 SSCG-GP Family VDD VDD S0,S1, Strapping to high SSON C Ltrim PI6C3622-1 PS8944A 01/30/08 ...

Page 8

... Low Power Spread Spectrum Frequency Multiplier Pericom Semiconductor Corporation 3545 N. 1st Street, San Jose, CA 95134 1-800-435-2335 DESCRIPTION: 8-Pin, 173-Mil Wide, TSSOP PACKAGE CODE: L Package Code L 8 PI6C3622-1 SSCG-GP Family DOCUMENT CONTROL NO 1308 REVISION: E DATE: 11/15/05 • www.pericom.com Package Description Pb-Free & Green, 8-Pin TSSOP ...

Page 9

... The inclusion of PSC products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifi es PSC against all charges. Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com Low Power Spread Spectrum Frequency Multiplier 9 PI6C3622-1 SSCG-GP Family PS8944A 01/30/08 ...

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