ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B Low Power EMI Reduction IC Description The ASM3P28XX devices are versatile spread spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 10 MHz to 40 MHz. Refer to Input/Output Frequency Range Selection Table. The ASM3P28XX can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P28XX−A and the ASM3P28XX−B offer various combinations of spread options and percentage deviations. Refer to Frequency Deviation and Spread Selection Table. These combinations include Down and Center Spread, and percentage deviation range from ±0.625% to −3.5%. The ASM3P28XX reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P28XX 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 ASM3P28XX modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, 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 ASM3P28XX uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all−digital method. http://onsemi.com SOIC−8 S SUFFIX CASE 751BD TSSOP−8 T SUFFIX CASE 948AL PIN CONFIGURATION XIN / CLKIN 1 XOUT VSS VDD D_C FRS SRS ModOUT (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 7 of this data sheet. Applications The ASM3P28XX is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and high−speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems. Features • FCC Approved Method of EMI Attenuation • Provides up to 15 dB EMI Reduction • Generates a 1x, 2x and 4x Low EMI Spread Spectrum • 8 Frequency Deviation Selections: • • • • • • • • • • Clock of the Input Frequency ♦ 1x: ASM3P2811A/B ♦ 2x: ASM3P2812A/B ♦ 4x: ASM3P2814A/B Optimized for Input Frequency Range from 10 MHz to 40 MHz Internal Loop Filter Minimizes External Components and Board Space Selectable Spread Options: ♦ Down Spread and Center Spread © Semiconductor Components Industries, LLC, 2011 August, 2011 − Rev. 3 1 ♦ ±0.625% to −3.5% Low Inherent Cycle−to−Cycle Jitter 3.3 V Operating Voltage CMOS/TTL Compatible Inputs and Outputs Pin−out Compatible with Cypress CY25811, CY25812 and CY25814 Commercial and Industrial Temperature Range Available in 8−pin SOIC and TSSOP Packages These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Publication Order Number: ASM3P2811A/D ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B D_C VDD SRS FRS PLL Modulation XIN / CLKIN Frequency Divider Crystal Oscillator XOUT Phase Detector Feedback Divider Loop Filter VCO Output Divider ModOUT VSS Figure 1. Block Diagram Table 1. 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 D_C I Digital logic input used to select Down (LOW) or Center (HIGH) spread options. (Refer to Frequency Deviation and Spread Selection Table). This pin has an internal pull−up resistor. 4 SRS I Spread range select. Digital logic input used to select frequency deviation (Refer to Frequency Deviation and Spread Selection Table). This pin has an internal pull−up resistor. 5 ModOUT O Spread spectrum clock output 6 FRS I Frequency range select. Digital logic input used to select Input frequency range (Refer to Input/Output Frequency Range Selection Table). This pin has an internal pull−up resistor. 7 VDD P Power supply for the entire chip. 8 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. Table 2. INPUT/OUTPUT FREQUENCY RANGE SELECTION Part Number FRS (pin 6) ASM3P2811 (1x) ASM3P2812 (2x) ASM3P2814 (4x) Modulation Rate Input (MHz) Output (MHz) Input (MHz) Output (MHz) Input (MHz) 0 10−20 10−20 10−20 20−40 10−20 40−80 Input Frequency / 448 1 20−40 20−40 20−40 40−80 20−40 80−160 Input Frequency / 896 http://onsemi.com 2 Output (MHz) ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B Table 3. OUTPUT FREQUENCY DEVIATION AND SPREAD SELECTION Frequency Deviation (%) (Note 1) FS = 0 FS = 1 Part Number D_C (pin 3) SRS (pin 4) 10/20/40 (MHz) 20/40/80 (MHz) 20/40/80 (MHz) 40/80/160 (MHz) ASM3P28XXA 0 0 −3 −2.5 −2.7 −2.6 0 1 −3.7 −3.4 −3.8 −3.6 1 0 ±1.5 ±1.2 ±1.5 ±1.3 1 1 ±1.8 ±1.6 ±1.9 ±1.8 0 0 −1.7 −1.0 −1.5 −1.4 0 1 −2.0 −1.5 −2.0 −1.9 1 0 ±0.75 ±0.6 ±0.8 ±0.7 1 1 ±1.0 ±0.75 ±1.0 ±0.9 ASM3P28XXB 1. Frequency Deviation given in the table is for the Output Frequency Range covering ASM3P2811x / 12x / 14x. Table 4. ABSOLUTE MAXIMUM RATINGS Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any pin with respect to Ground −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 2 KV TDV Static Discharge Voltage (As per JEDEC STD 22− A114−B) Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 5. OPERATING CONDITIONS Symbol Min Max Unit Voltage on any pin with respect to GND 3.0 3.6 V TA Operating temperature −40 +85 °C CL Load Capacitance 10 pF CIN Input Capacitance 7 pF VDD Parameter http://onsemi.com 3 ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B Table 6. DC ELECTRICAL CHARACTERISTICS Symbol Parameter Min Typ Max Unit VIL Input low voltage VSS−0.3 0.8 V VIH Input high voltage 2 VDD+0.3 V IIL Input low current (Inputs D_C, SRS and FRS are pulled high internally) −50 mA IIH Input high current 50 mA IXOL XOUT Output low current (VXOL @ 0.4 V, VDD = 3.3 V) 3 mA IXOH XOUT Output high current (VXOH @ 2.5 V, VDD = 3.3 V) 3 mA VOL Output low voltage (VDD = 3.3 V, IOL = 5 mA) 0.4 V VOH Output high voltage (VDD = 3.3 V, IOH = −5 mA) ICC Dynamic supply current (Unloaded Output) IDD Static supply current, Standby mode (CLKIN pulled to GND) VDD tON ZOUT 2.5 V 8 Operating voltage 3.0 3.3 Power up time (first locked clock cycle after power up) Clock out impedance 18 mA 4.5 mA 3.6 V 500 mS 76 W Table 7. AC ELECTRICAL CHARACTERISTICS Symbol fIN Parameter Min Typ Max Unit Input frequency for ASM3P2811/12/13/14 A/B 10 40 MHz Output frequency for ASM3P2811A/B 10 40 MHz Output frequency for ASM3P2812A/B 20 80 MHz Output frequency for ASM3P2814A/B 40 160 MHz tLH (Note 2) Output rise time (measured at 0.8 V to 2.0 V) 0.5 0.9 1.2 nS tHL (Note 2) Output fall time (measured at 2.0 V to 0.8 V) 0.8 1.0 1.3 nS fOUT tJC Cycle−to−Cycle Jitter (Unloaded Output) tD Output duty cycle pS ±250 45 2. tLH and tHL are measured into a capacitive load of 10 pF. http://onsemi.com 4 50 55 % ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B PACKAGE DIMENSIONS TSSOP8, 4.4x3 CASE 948AL−01 ISSUE O b SYMBOL MIN NOM A E1 E MAX 1.20 A1 0.05 A2 0.80 b 0.19 0.30 c 0.09 0.20 D 2.90 3.00 3.10 E 6.30 6.40 6.50 E1 4.30 4.40 4.50 0.15 0.90 e 0.65 BSC L 1.00 REF L1 0.50 θ 0º 0.60 1.05 0.75 8º e TOP VIEW D A2 c q1 A A1 L1 SIDE VIEW L END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-153. http://onsemi.com 5 ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B PACKAGE DIMENSIONS SOIC 8, 150 mils CASE 751BD−01 ISSUE O E1 E SYMBOL MIN A 1.35 1.75 A1 0.10 0.25 b 0.33 0.51 c 0.19 0.25 D 4.80 5.00 E 5.80 6.20 E1 3.80 4.00 MAX 1.27 BSC e PIN # 1 IDENTIFICATION NOM h 0.25 0.50 L 0.40 1.27 θ 0º 8º TOP VIEW D h A1 θ A c e b L END VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. http://onsemi.com 6 ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B Table 8. ORDERING INFORMATION Part Number Marking Package Type Temperature ASM3P2811AF−08SR 3P2811AFS SOIC – Tape & Reel, Pb free Commercial ASM3P2811AF−08ST 3P2811AFS SOIC – Tube, Pb free Commercial ASM3P2811AF−08TR 3P2811AFT TSSOP – Tape & Reel, Pb free Commercial ASM3P2811AF−08TT 3P2811AFT TSSOP – Tube, Pb free Commercial ASM3P2811BF−08SR 3P2811BFS SOIC – Tape & Reel, Pb free Commercial ASM3P2811BF−08ST 3P2811BFS SOIC – Tube, Pb free Commercial ASM3P2811BF−08TR 3P2811BFT TSSOP – Tape & Reel, Pb free Commercial ASM3P2811BF−08TT 3P2811BFT TSSOP – Tube, Pb free Commercial ASM3P2812AF−08SR 3P2812AFS SOIC – Tape & Reel, Pb free Commercial ASM3P2812AF−08ST 3P2812AFS SOIC – Tube, Pb free Commercial ASM3P2812AF−08TR 3P2812AFT TSSOP – Tape & Reel, Pb free Commercial ASM3P2812AF−08TT 3P2812AFT TSSOP – Tube, Pb free Commercial ASM3P2812BF−08SR 3P2812BFS SOIC – Tape & Reel, Pb free Commercial ASM3P2812BF−08ST 3P2812BFS SOIC – Tube, Pb free Commercial ASM3P2812BF−08TR 3P2812BFT TSSOP – Tape & Reel, Pb free Commercial ASM3P2812BF−08TT 3P2812BFT TSSOP – Tube, Pb free Commercial ASM3P2814AF−08SR 3P2814AFS SOIC – Tape & Reel, Pb free Commercial ASM3P2814AF−08ST 3P2814AFS SOIC – Tube, Pb free Commercial ASM3P2814AF−08TR 3P2814AFT TSSOP – Tape & Reel, Pb free Commercial ASM3P2814AF−08TT 3P2814AFT TSSOP – Tube, Pb free Commercial ASM3P2814BF−08SR 3P2814BFS SOIC – Tape & Reel, Pb free Commercial ASM3P2814BF−08ST 3P2814BFS SOIC – Tube, Pb free Commercial ASM3P2814BF−08TR 3P2814BFT TSSOP – Tape & Reel, Pb free Commercial ASM3P2814BF−08TT 3P2814BFT TSSOP – Tube, Pb free Commercial ASM3I2811AF−08SR 3I2811AFS SOIC – Tape & Reel, Pb free Industrial ASM3I2811AF−08ST 3I2811AFS SOIC – Tube, Pb free Industrial ASM3I2811AF−08TR 3I2811AFT TSSOP – Tape & Reel, Pb free Industrial ASM3I2811AF−08TT 3I2811AFT TSSOP – Tube, Pb free Industrial ASM3I2811BF−08SR 3I2811BFS SOIC – Tape & Reel, Pb free Industrial ASM3I2811BF−08ST 3I2811BFS SOIC – Tube, Pb free Industrial ASM3I2811BF−08TR 3I2811BFT TSSOP – Tape & Reel, Pb free Industrial ASM3I2811BF−08TT 3I2811BFT TSSOP – Tube, Pb free Industrial ASM3I2812AF−08SR 3I2812AFS SOIC – Tape & Reel, Pb free Industrial ASM3I2812AF−08ST 3I2812AFS SOIC – Tube, Pb free Industrial ASM3I2812AF−08TR 3I2812AFT TSSOP – Tape & Reel, Pb free Industrial ASM3I2812AF−08TT 3I2812AFT TSSOP – Tube, Pb free Industrial ASM3I2812BF−08SR 3I2812BFS SOIC – Tape & Reel, Pb free Industrial ASM3I2812BF−08ST 3I2812BFS SOIC − Tube, Pb free Industrial ASM3I2812BF−08TR 3I2812BFT TSSOP – Tape & Reel, Pb free Industrial ASM3I2812BF−08TT 3I2812BFT TSSOP – Tube, Pb free Industrial ASM3I2814AF−08SR 3I2814AFS SOIC − Tape & Reel, Pb free Industrial ASM3I2814AF−08ST 3I2814AFS SOIC − Tube, Pb free Industrial http://onsemi.com 7 ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B Table 8. ORDERING INFORMATION (continued) Part Number Marking Package Type Temperature ASM3I2814AF−08TR 3I2814AFT TSSOP – Tape & Reel, Pb free Industrial ASM3I2814AF−08TT 3I2814AFT TSSOP – Tube, Pb free Industrial ASM3I2814BF−08SR 3I2814BFS SOIC − Tape & Reel, Pb free Industrial ASM3I2814BF−08ST 3I2814BFS SOIC − Tube, Pb free Industrial ASM3I2814BF−08TR 3I2814BFT TSSOP – Tape & Reel, Pb free Industrial ASM3I2814BF−08TT 3I2814BFT TSSOP – Tube, Pb free Industrial ASM3P2811AG−08SR 3P2811AGS SOIC – Tape & Reel, Green Commercial ASM3P2811AG−08ST 3P2811AGS SOIC – Tube, Green Commercial ASM3P2811AG−08TR 3P2811AGT TSSOP – Tape & Reel, Green Commercial ASM3P2811AG−08TT 3P2811AGT TSSOP – Tube, Green Commercial ASM3P2811BG−08SR 3P2811BGS SOIC – Tape & Reel, Green Commercial ASM3P2811BG−08ST 3P2811BGS SOIC – Tube, Green Commercial ASM3P2811BG−08TR 3P2811BGT TSSOP – Tape & Reel, Green Commercial ASM3P2811BG−08TT 3P2811BGT TSSOP – Tube, Green Commercial ASM3P2812AG−08SR 3P2812AGS SOIC – Tape & Reel, Green Commercial ASM3P2812AG−08ST 3P2812AGS SOIC – Tube, Green Commercial ASM3P2812AG−08TR 3P2812AGT TSSOP – Tape & Reel, Green Commercial ASM3P2812AG−08TT 3P2812AGT TSSOP – Tube, Green Commercial ASM3P2812BG−08SR 3P2812BGS SOIC – Tape & Reel, Green Commercial ASM3P2812BG−08ST 3P2812BGS SOIC – Tube, Green Commercial ASM3P2812BG−08TR 3P2812BGT TSSOP – Tape & Reel, Green Commercial ASM3P2812BG−08TT 3P2812BGT TSSOP – Tube, Green Commercial ASM3P2814AG−08SR 3P2814AGS SOIC – Tape & Reel, Green Commercial ASM3P2814AG−08ST 3P2814AGS SOIC – Tube, Green Commercial ASM3P2814AG−08TR 3P2814AGT TSSOP – Tape & Reel, Green Commercial ASM3P2814AG−08TT 3P2814AGT TSSOP – Tube, Green Commercial ASM3P2814BG−08SR 3P2814BGS SOIC – Tape & Reel, Green Commercial ASM3P2814BG−08ST 3P2814BGS SOIC – Tube, Green Commercial ASM3P2814BG−08TR 3P2814BGT TSSOP – Tape & Reel, Green Commercial ASM3P2814BG−08TT 3P2814BGT TSSOP – Tube, Green Commercial ASM3I2811AG−08SR 3I2811AGS SOIC – Tape & Reel, Green Industrial ASM3I2811AG−08ST 3I2811AGS SOIC – Tube, Green Industrial ASM3I2811AG−08TR 3I2811AGT TSSOP – Tape & Reel, Green Industrial ASM3I2811AG−08TT 3I2811AGT TSSOP – Tube, Green Industrial ASM3I2811BG−08SR 3I2811BGS SOIC – Tape & Reel, Green Industrial ASM3I2811BG−08ST 3I2811BGS SOIC – Tube, Green Industrial ASM3I2811BG−08TR 3I2811BGT TSSOP – Tape & Reel, Green Industrial ASM3I2811BG−08TT 3I2811BGT TSSOP – Tube, Green Industrial ASM3I2812AG−08SR 3I2812AGS SOIC – Tape & Reel, Green Industrial ASM3I2812AG−08ST 3I2812AGS SOIC – Tube, Green Industrial ASM3I2812AG−08TR 3I2812AGT TSSOP – Tape & Reel, Green Industrial ASM3I2812AG−08TT 3I2812AGT TSSOP – Tube, Green Industrial http://onsemi.com 8 ASM3P2811A/B, ASM3P2812A/B, ASM3P2814A/B Table 8. ORDERING INFORMATION (continued) Part Number Marking Package Type Temperature ASM3I2812BG−08SR 3I2812BGS SOIC – Tape & Reel, Green Industrial ASM3I2812BG−08ST 3I2812BGS SOIC − Tube, Green Industrial ASM3I2812BG−08TR 3I2812BGT TSSOP – Tape & Reel, Green Industrial ASM3I2812BG−08TT 3I2812BGT TSSOP – Tube, Green Industrial ASM3I2814AG−08SR 3I2814AGS SOIC − Tape & Reel, Green Industrial ASM3I2814AG−08ST 3I2814AGS SOIC − Tube, Green Industrial ASM3I2814AG−08TR 3I2814AGT TSSOP – Tape & Reel, Green Industrial ASM3I2814AG−08TT 3I2814AGT TSSOP – Tube, Green Industrial ASM3I2814BG−08SR 3I2814BGS SOIC − Tape & Reel, Green Industrial ASM3I2814BG−08ST 3I2814BGS SOIC − Tube, Green Industrial ASM3I2814BG−08TR 3I2814BGT TSSOP – Tape & Reel, Green Industrial ASM3I2814BG−08TT 3I2814BGT TSSOP – Tube, Green Industrial 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. 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