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PCS3P25811 and PCS3P25812 and PCS3P25814
Spread Spectrum Clock Generator
Features
* Generates a 1x (PCS3P25811), 2x (PCS3P25812) and 4x(PCS3P25814) low EMI spread spectrum clock of the input frequency * Provides up to 15dB of EMI suppression * Input Frequency: 4MHz - 32MHz * Output Frequency: PCS3P25811: 4MHz - 32MHz PCS3P25812: 8MHz - 64MHz PCS3P25814: 16MHz - 128MHz * Selectable spread options: Down Spread and Center Spread * Low Power Dissipation: 3.3V: 20mW (typ) @ 6MHz 3.3V: 24mW (typ) @ 12MHz 3.3V: 30mW (typ) @ 24MHz * Low inherent Cycle-to-Cycle Jitter * Supply Voltage: 2.8V to 3.6V * LVCMOS Input and output * Functional and Pinout compatible to Cypress CY25811, CY25812 and CY25814 dependent signals. It allows significant system cost savings by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass EMI regulations. The PCS3P25811/12/14 can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The PCS3P25811/12/14 modulate the output of a single PLL in order to "spread" the bandwidth of a synthesized cock, and more importantly, decreases the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal's bandwidth is called `spread spectrum clock generation.' The PCS3P25811/12/14 use the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. The PCS3P25811/12/14 have 2 pins S0 and S1 to control the selection of Center Spread, Down Spread and NoSpread functions. Additionally there is a 3 level logic contol FSEL, for selecting one of the three different frequency ranges within the operating frequency range. Refer Input/Output Frequency Range Selection Table. The PCS3P25811/12/14 operate from a 2.8V to 3.6V supply and are available in 8 pin SOIC, and 8L 2mmX2mm WDFN packages.
* 8-pin SOIC, and 8L 2mmX2mm WDFN (TDFN)
Packages
Product Description The PCS3P25811/12/14 devices are versatile spread
spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 4MHz to 32MHz. The PCS3P25811/12/14 reduce electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data
Applications
The PCS3P25811/12/14 are targeted towards EMI management in applications such as LCD Panels, MFPs, Digital copiers, Networking, PC peripheral devices, consumer electronics, and embedded controller systems.
(c)2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 1
Publication Order Number: PCS3P25811/D
PCS3P25811 and PCS3P25812 and PCS3P25814
Block Diagram
FSEL S1 S0 VDD
XIN / CLKIN Crystal Oscillator XOUT Frequency Divider Feedback Divide r
Input Decoder & Modulation control
PLL
Phase Detector
Loop Filter
VCO
Output Divider ModOUT
Pin Configuration
XIN / CLKIN 1 VSS 2 S1 3 S0 4 PCS3P25811 PCS3P25812 PCS3P25814
8
VSS
XOUT VDD FSEL ModOUT
7
6
5
Pin Description Pin#
1 2 3 4 5 6 7 8
Pin Name
XIN / CLKIN VSS S1 S0 ModOUT FSEL VDD XOUT
Type
I P I I O I P O
Description
Crystal connection or External Clock input. Ground to entire chip. Digital 3 level logic input (1-M-0) used to select Center, Down and No spread options. (Refer to Frequency Deviation Selection Table). Default=M. Digital 3 level logic input (1-M-0) used to select Center, Down and No spread options. (Refer to Frequency Deviation Selection Table). Default=M. Spread Spectrum Clock Output. Frequency range select. Digital 3 level logic input (1-M-0) used to select Input Clock frequency range (Refer to Input/Output Frequency Range Selection Table). Default=M. Power supply for the entire chip (2.8V to 3.6V). Crystal connection. If using an external reference, this pin must be left unconnected.
Rev. 1 | Page 2 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
Input/Output Frequency Range Selection Table Part Number FSEL (pin 6) PCS3P25811 (1x)
Input (MHz) 0 1 M 4-8 8-16 16-32 Output (MHz) 4-8 8-16 16-32
PCS3P25812 (2x)
Input (MHz) 4-8 8-16 16-32 Output (MHz) 8-16 16-32 32-64
PCS3P25814 (4x)
Input (MHz) 4-8 8-16 16-32 Output (MHz) 16-32 32-64 64-128
Modulation Rate
Input Frequency / 128 Input Frequency / 256 Input Frequency / 512
Output Frequency Deviation Selection Table
CLKIN (MHz) 4-5 5-6 6-7 7-8 8-10 10-12 12-14 14-16 16-20 20-24 24-28 28-32 FSEL 0 0 0 0 1 1 1 1 M M M M S1=0 S0=0 Center 1.4 1.3 1.2 1.1 1.4 1.3 1.2 1.1 1.4 1.3 1.2 1.1 S1=0 S0=M Center 1.2 1.1 0.9 0.9 1.2 1.1 0.9 0.9 1.2 1.1 0.9 0.9 S1=0 S0=1 Center 0.6 0.5 0.5 0.4 0.6 0.5 0.5 0.4 0.6 0.5 0.5 0.4 S1=M S0=0 Center 0.5 0.4 0.4 0.3 0.5 0.4 0.4 0.3 0.5 0.4 0.4 0.3 S1=1 S0=1 Down -3 -2.7 -2.5 -2.3 -3 -2.7 -2.5 -2.3 -3 -2.7 -2.5 -2.3 S1=1 S0=0 Down -2.2 -1.9 -1.8 -1.7 -2.2 -1.9 -1.8 -1.7 -2.2 -1.9 -1.8 -1.7 S1=M S0=1 Down -1.9 -1.7 -1.5 -1.4 -1.9 -1.7 -1.5 -1.4 -1.9 -1.7 -1.5 -1.4 S1=1 S0=M Down -0.7 -0.6 -0.6 -0.5 -0.7 -0.6 -0.6 -0.5 -0.7 -0.6 -0.6 -0.5 S1=M S0=M No Spread 0 0 0 0 0 0 0 0 0 0 0 0
Note: Frequency Deviation given in the table is for the Input Frequency Range covering PCS3P25811/12 /14.
3 Level Digital Logic
S0, S1, and FSEL digital inputs are designed to sense 3 different logic levels designated as High "1", Low "0" and Middle "M". With this 3-Level digital input logic 9 different logic states can be detected. S0, S1 and FSEL pins include an on chip 100K (50K/50K) resistor divider. No external application resistors are needed to implement the 3-Level logic levels as shown below: Logic 1 M 0 Control Pins FSEL, S0, S1 to VDD FSEL, S0, S1 UNCONNECTED FSEL, S0, S1 to VSS
VSS VDD
Rev. 1 | Page 3 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
Operating Conditions Symbol
VDD TA CL CIN Operating temperature Load Capacitance Input Capacitance
Parameter
Min
2.8 0
Max
3.6 +70 15 7
Unit
V C pF pF
Voltage on any pin with respect to VSS
Absolute Maximum Ratings Symbol
VDD, VIN TSTG Ts TJ TDV Storage temperature
Parameter
Rating
-0.5 to +4.6 -65 to +125 260 150 2
Unit
V C C C KV
Voltage on any pin with respect to Ground Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD 22- A114-B)
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability.
DC Electrical Characteristics Symbol
VDD VIL VIM VIH VOL VOH CIN Supply Voltage Input low voltage (S0, S1, FSEL Inputs) Commercial Temp. Industrial Temp.
Parameter
Min
2.8 0 0 0.4VDD 0.85VDD
Typ
3.3
Max
3.6 0.15VDD 0.13 VDD 0.60VDD VDD 0.4 1.2
Unit
V V V V V V
Input Middle Voltage (S0, S1, FSEL Inputs) Input high voltage (S0, S1, FSEL Inputs) Output low voltage (ModOUT Output) Output high voltage (ModOUT Output) Input Capacitance (XIN And XOUT) XIN / CLKIN = 12MHz Commercial Temp XIN / CLKIN = 24MHz XIN / CLKIN = 32MHz XIN / CLKIN = 12MHz Industrial Temp XIN / CLKIN = 24MHz XIN / CLKIN = 32MHz Dynamic supply current (Unloaded Output) IOL= 4mA IOL= 10mA IOH= -4mA IOH= -6mA
2.4 2 6 9 8 10 13 10 12 15 0.5
pF
mA
IDD
mA
ICC
Static supply current (XIN / CLKIN pulled to VSS)
mA
Note. The voltage on any input or I/O pin cannot exceed the power pin during power up. All parameters are specified at Commercial and Industrial temperature unless stated otherwise.
Rev. 1 | Page 4 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
AC Electrical Characteristics Symbol
fIN
Parameter
Input Clock frequency for PCS3P25811/12/14 ModOUT Clock frequency for PCS3P25811
Min
4 4 8 16 2 1 2 1 40 40 4MHz 8MHz 16MHz
Typ
Max
32 32 64 128 5
Unit
MHz MHz MHz MHz nS
fOUT
ModOUT Clock frequency for PCS3P25812 ModOUT Clock frequency for PCS3P25814
tLH
1, 2
ModOUT Rise time (Measured from 20% to 80%) ModOUT Fall time (Measured from 80% to 20%)
PCS3P25811/12/14 PCS3P25814 When FSEL=M PCS3P25811/12/14 PCS3P25814 When FSEL=M
2.2 4.4 nS 2.2 60 60 600 450 400 380 380 380 500 400 380 2 3 pS pS % %
tHL
1, 2
TDCIN TDCOUT
1, 2
Input Clock Duty Cycle(XIN / CLKIN) Output Clock Duty Cycle (ModOUT) PCS3P25811
Cy-Cy Jitter, For ModOUT with Spread ON (For Commercial temperature) Cy-Cy Jitter, For ModOUT with Spread ON (For Industrial temperature) PLL Lock Time tON
2
PCS3P25812
32MHz 64MHz
2 TJC
PCS3P25814
128MHz CLKIN = 6MHz CLKIN = 12MHz CLKIN = 24MHz Commercial Temp. Industrial Temp.
PCS3P25811 PCS3P25812 PCS3P25814
(Stable power supply, valid input clock to valid Clock on ModOUT)
mS
Notes: 1.Parameters are specified with 15pF loaded outputs. 2. Parameter is guaranteed by design and characterization. Not 100% tested in production.
Rev. 1 | Page 5 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
Application Schematic
VDD C3 0.1F Centre Spread 0.5% ModOUT 5 8 XOUT VDD PCS3P25811/12/14
6 FSEL
CL
1
7
XIN
VDD
CL
Y1 12MHz
12MHz (PCS3P25811) 24MHz (PCS3P25812) 48MHz (PCS3P25814) VDD
S0 4 S1 3 VSS
2
Typical Crystal Specifications Fundamental AT cut parallel resonant crystal
Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance(CP) Shunt capacitance ESR 12MHz 30 ppm or better at 25 C -25 to +85 C C -40 to +85 C C 18pF 7pF maximum 25
Note: Note: CL is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency.
Typical Crystal Interface Circuit
R
Crystal
Rx
CL
CL
CL = 2*(CP - CS), Where CP = Load capacitance of crystal CS = Stray capacitance due to CIN, PCB, Trace etc.
Rev. 1 | Page 6 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
Package Information 8-Pin SOIC Package
E
H
D
A2
A
e A 1 B
C L
D
Dimensions Inches Min
A1 A A2 B C D E e H L 0.004 0.053 0.049 0.012 0.007
Symbol
Max
0.010 0.069 0.059 0.020 0.010
Millimeters Min Max
0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8 0.25 1.75 1.50 0.51 0.25
0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8
Note: Controlling dimensions are millimeters. SOIC: 0.074 grams unit weight.
Rev. 1 | Page 7 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
8L 2mmX2mm WDFN package
Symbol
A A3 b D E e L
Dimensions Inches Millimeters Min Max Min Max
0.027 0.008 0.077 0.077 0.020 0.0315 0.012 0.080 0.080 0.024 0.70 0.20 1.95 1.95 0.50 0.80 0.203 BSC 0.30 2.05 2.05 0.50 BSC 0.60 0.008 BSC
0.020 BSC
Rev. 1 | Page 8 of 9 | www.onsemi.com
PCS3P25811 and PCS3P25812 and PCS3P25814
Ordering Code Part Number
PCS3P25811AG08SR P3P25812AG-08SR P3P25814AG-08SR P3P25811AG-08CR P3P25812AG-08CR P3P25814AG-08CR
Marking
CGL CIL CKL CG CI CK
Package Type
8-pin SOIC - Tape & Reel, Green 8-pin SOIC - Tape & Reel, Green 8-pin SOIC - Tape & Reel, Green 8L-WDFN (2mmX2mm) - Tape & Reel, Green 8L-WDFN (2mmX2mm) - Tape & Reel, Green 8L-WDFN (2mmX2mm) - Tape & Reel, Green
Temperature
0 to +70 C C 0 to +70 C C 0 to +70 C C 0 to +70 C C 0 to +70 C C 0 to +70 C C
A "microdot" placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free.
Licensed under US patent #5,488,627, #6,646,463 and #5,631,920.
Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. Many ON Semiconductor products are protected by issued patents or applications for patent. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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