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 • 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 ©2010 SCILLC. All rights reserved. NOVEMBER 2010 – Rev. 1.1 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. 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. Publication Order Number: PCS3P25811/D PCS3P25811 and PCS3P25812 and PCS3P25814 Block Diagram FSEL S1 S0 VDD Input Decoder & Modulation control XIN / CLKIN Crystal Oscillator Frequency Divider XOUT Feedback Divide r PLL Phase Detector Loop Filter VCO Output Divider ModOUT VSS Pin Configuration XIN / CLKIN 1 VSS 2 S1 3 PCS3P25811 PCS3P25812 PCS3P25814 S0 4 8 XOUT 7 VDD 6 FSEL 5 ModOUT Pin Description Pin# Pin Name Type Description 1 XIN / CLKIN I Crystal connection or External Clock input. 2 VSS P Ground to entire chip. 3 S1 I 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. 4 S0 I 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. 5 ModOUT O Spread Spectrum Clock Output. 6 FSEL I 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. 7 VDD P Power supply for the entire chip (2.8V to 3.6V). 8 XOUT O 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 PCS3P25811 (1x) FSEL (pin 6) PCS3P25812 (2x) PCS3P25814 (4x) Modulation Rate Input (MHz) Output (MHz) Input (MHz) Output (MHz) Input (MHz) Output (MHz) 0 4-8 4-8 4-8 8-16 4-8 16-32 Input Frequency / 128 1 8-16 8-16 8-16 16-32 8-16 32-64 Input Frequency / 256 M 16-32 16-32 16-32 32-64 16-32 64-128 Input Frequency / 512 Output Frequency Deviation Selection Table S1=0 S0=0 S1=0 S0=M S1=0 S0=1 S1=M S0=0 S1=1 S0=1 S1=1 S0=0 S1=M S0=1 S1=1 S0=M Center Center Center Center Down Down Down Down 0 ±1.4 ±1.2 ±0.6 ±0.5 -3 -2.2 -1.9 -0.7 S1=M S0=M No Spread 0 5-6 0 ±1.3 ±1.1 ±0.5 ±0.4 -2.7 -1.9 -1.7 -0.6 0 6-7 0 ±1.2 ±0.9 ±0.5 ±0.4 -2.5 -1.8 -1.5 -0.6 0 CLKIN (MHz) FSEL 4-5 7-8 0 ±1.1 ±0.9 ±0.4 ±0.3 -2.3 -1.7 -1.4 -0.5 0 8-10 1 ±1.4 ±1.2 ±0.6 ±0.5 -3 -2.2 -1.9 -0.7 0 10-12 1 ±1.3 ±1.1 ±0.5 ±0.4 -2.7 -1.9 -1.7 -0.6 0 12-14 1 ±1.2 ±0.9 ±0.5 ±0.4 -2.5 -1.8 -1.5 -0.6 0 14-16 1 ±1.1 ±0.9 ±0.4 ±0.3 -2.3 -1.7 -1.4 -0.5 0 16-20 M ±1.4 ±1.2 ±0.6 ±0.5 -3 -2.2 -1.9 -0.7 0 20-24 M ±1.3 ±1.1 ±0.5 ±0.4 -2.7 -1.9 -1.7 -0.6 0 24-28 M ±1.2 ±0.9 ±0.5 ±0.4 -2.5 -1.8 -1.5 -0.6 0 28-32 M ±1.1 ±0.9 ±0.4 ±0.3 -2.3 -1.7 -1.4 -0.5 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 Control Pins 1 FSEL, S0, S1 to VDD FSEL, S0, S1 UNCONNECTED FSEL, S0, S1 to VSS M 0 VDD VSS Rev. 1 | Page 3 of 9 | www.onsemi.com PCS3P25811 and PCS3P25812 and PCS3P25814 Operating Conditions Symbol VDD Parameter Voltage on any pin with respect to VSS Min Max Unit 2.8 3.6 V 0 +70 °C TA Operating temperature CL Load Capacitance 15 pF CIN Input Capacitance 7 pF Absolute Maximum Ratings Symbol VDD, VIN TSTG Rating Unit Voltage on any pin with respect to Ground Parameter -0.5 to +4.6 V Storage temperature -65 to +125 °C Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C TDV Static Discharge Voltage (As per JEDEC STD 22- A114-B) 2 KV 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 Parameter Supply Voltage Min Typ Max Unit 2.8 3.3 3.6 V Commercial Temp. 0 0.15VDD Industrial Temp. 0 0.13 VDD Input Middle Voltage (S0, S1, FSEL Inputs) 0.4VDD 0.60VDD V VIH Input high voltage (S0, S1, FSEL Inputs) 0.85VDD VDD V VOL Output low voltage (ModOUT Output) IOL= 4mA 0.4 IOL= 10mA 1.2 VOH Output high voltage (ModOUT Output) IOH= -4mA 2.4 IOH= -6mA 2 CIN Input Capacitance (XIN And XOUT) VIL Input low voltage (S0, S1, FSEL Inputs) VIM IDD ICC Dynamic supply current (Unloaded Output) Commercial Temp Industrial Temp 6 9 8 XIN / CLKIN = 24MHz 10 XIN / CLKIN = 32MHz 13 XIN / CLKIN = 12MHz 10 XIN / CLKIN = 24MHz 12 XIN / CLKIN = 32MHz 15 0.5 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 V V XIN / CLKIN = 12MHz Static supply current (XIN / CLKIN pulled to VSS) V pF mA mA mA PCS3P25811 and PCS3P25812 and PCS3P25814 AC Electrical Characteristics Symbol fIN fOUT TDCIN TDCOUT 1, 2 2 tON Max Unit 32 MHz ModOUT Clock frequency for PCS3P25811 4 32 MHz ModOUT Clock frequency for PCS3P25812 8 64 MHz ModOUT Clock frequency for PCS3P25814 16 128 MHz PCS3P25811/12/14 2 5 PCS3P25814 When FSEL=M 1 2.2 PCS3P25811/12/14 2 4.4 PCS3P25814 When FSEL=M 1 2.2 Input Clock Duty Cycle(XIN / CLKIN) 40 60 % Output Clock Duty Cycle (ModOUT) 40 60 % Cy-Cy Jitter, For ModOUT with Spread ON 2 TJC Typ 4 ModOUT Fall time (Measured from 80% to 20%) 1, 2 Min Input Clock frequency for PCS3P25811/12/14 ModOUT Rise time (Measured from 20% to 80%) 1, 2 tLH tHL Parameter (For Commercial temperature) PCS3P25811 PCS3P25812 PCS3P25814 Cy-Cy Jitter, For ModOUT with Spread ON PCS3P25811 (For Industrial temperature) PCS3P25814 PCS3P25812 4MHz 600 8MHz 450 16MHz 400 32MHz 380 64MHz 380 128MHz 380 CLKIN = 6MHz 500 CLKIN = 12MHz 400 CLKIN = 24MHz 380 PLL Lock Time Commercial (Stable power supply, valid input clock Temp. to valid Clock on ModOUT) Industrial Temp. 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 2 3 nS nS pS pS mS PCS3P25811 and PCS3P25812 and PCS3P25814 Application Schematic VDD 7 CL 1 CL C3 0.1µF VDD XIN Y1 12MHz Centre Spread ±0.5% 12MHz (PCS3P25811) 24MHz (PCS3P25812) 48MHz (PCS3P25814) ModOUT 5 8 XOUT VDD VDD PCS3P25811/12/14 S0 4 6 FSEL VSS S1 3 2 Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 12MHz Frequency tolerance ± 30 ppm or better at 25°C Operating temperature range -25°C to +85°C Storage temperature -40°C to +85°C Load capacitance(CP) 18pF Shunt capacitance 7pF maximum ESR 25 Ω 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 CL Rx 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 H E D A2 A θ C D e A1 L B Dimensions Symbol Inches Min Max Millimeters Min Max A1 0.004 0.010 0.10 0.25 A 0.053 0.069 1.35 1.75 A2 0.049 0.059 1.25 1.50 B 0.012 0.020 0.31 0.51 C 0.007 0.010 0.18 0.25 D 0.193 BSC 4.90 BSC E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H 0.236 BSC 6.00 BSC L 0.016 0.050 θ 0° 8° 0.41 1.27 0° 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 Dimensions Inches Millimeters Min Max Min Max 0.027 0.0315 0.70 0.008 BSC 0.008 0.012 0.80 0.203 BSC 0.20 0.30 D 0.077 0.080 1.95 2.05 E 0.077 0.080 1.95 2.05 e L 0.020 BSC 0.020 0.024 0.50 BSC 0.50 Rev. 1 | Page 8 of 9 | www.onsemi.com 0.60 PCS3P25811 and PCS3P25812 and PCS3P25814 Ordering Code Part Number Marking Package Type Temperature PCS3P25811AG08SR CGL 8-pin SOIC – Tape & Reel, Green 0°C to +70°C P3P25812AG-08SR CIL 8-pin SOIC – Tape & Reel, Green 0°C to +70°C P3P25814AG-08SR CKL 8-pin SOIC – Tape & Reel, Green 0°C to +70°C P3P25811AG-08CR CG 8L-WDFN (2mmX2mm) - Tape & Reel, Green 0°C to +70°C P3P25812AG-08CR CI 8L-WDFN (2mmX2mm) - Tape & Reel, Green 0°C to +70°C P3P25814AG-08CR CK 8L-WDFN (2mmX2mm) - Tape & Reel, Green 0°C to +70°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. 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