CY2XP304 High-Frequency Programmable PECL Clock Generation Module Features • HSTL inputs—HSTL-to-LVPECL level translation • 125- to 500-MHz output range for high-speed applications • Period jitter peak-peak 125MHz(max.) = 55 ps • Four low-skew LVPECL outputs • High-speed PLL bypass mode to 1.5 GHz • Phase-locked loop (PLL) multiplier select • 36-VFBGA, 6 × 8 × 1 mm • Serially-configurable multiply ratios • 3.3V operation • Eight-bit feedback counter and six-bit reference counter for high accuracy Block Diagram CLK0 PLL_MULT CLK0B CLK1 XIN XTAL OSCILLATOR XOUT 0 PLL xM CLK1B CLK2 1 SER CLK CLK2B CLK3 SER DATA CLK3B INA INAB CLK_SEL Pin Configuration C Y 2 X P 3 0 4 3 6 V F B G A P IN C O N F IG U R A T IO N C LK 0 C LK 0B 6 5 4 3 2 1 VDDA GND GND S E R_D A TA Xo u t S E R_CL K Xi n VDDB A CLK 1 T O P V IE W C LK 2 CLK 1B CLK 2B T O P V IE W GND GND V DDA GND V DDB V DDA GND VDDB NC GND VDDA GND P LL_M U L T CLK _S E L IN A IN A B VDDA C D E F G H B Cypress Semiconductor Corporation Document #: 38-07589 Rev. *B C LK 3B GND GND VDDB CLK 3 • 3901 North First Street • San Jose, CA 95134 • 408-943-2600 Revised July 28, 2004 CY2XP304 Pin Definitions Pin # Pin Name A1,B1,G3,G4 VDDB Pin Description 3.3V Power Supply for Crystal Driver A2 XIN A3 XOUT Reference Crystal Feedback A4,B2,C1,C3,C4,F3,F4,G2,G5,B5 GND Ground A5,H1,H2,H4,H5 VDDA 3.3V Power Supply A6 CLK0 LVPECL Clock Output B6 CLK0B C6 CLK1 D6 CLK1B E6 CLK2 F6 CLK2B G6 CLK3 H6 Reference Crystal Input LVPECL Clock Output (Complement) LVPECL Clock Output LVPECL Clock Output (Complement) LVPECL Clock Output LVPECL Clock Output (Complement) LVPECL Clock Output CLK3B LVPECL Clock Output (Complement) B3 SER_CLK Serial Interface Clock B4 SER_DATA Serial Interface Data D1 PLL_MULT PLL Multiplier Select Input, Internal pull-up resistor, see Frequency Table E1 CLK_SEL F1,G1 INA,INAB H3 NC Clock Select Input, Internal Pull down. HIGH select INA/INAB, Internal PLL is bypassed. LOW select internal PLL Differential Clock Input pair, used in PLL-bypassed mode No Connect Frequency Table M (PLL Multiplier) Example Input Crystal Frequency CLK[0:3],CLKB[0:3] 0 PLL_Mult x16 25 MHz 400 MHz 31.25 MHz 500 MHz 1 x8 15.625 MHz 125 MHz CY2XP304 Two-Wire Serial Interface Introduction The CY2XP304 has a two-wire serial interface designed for data transfer operations, and is used for programming the P and Q values for frequency generation. Sclk is the serial clock line controlled by the master device. Sdata is a serial bidirectional data line. The CY2XP304 is a slave device and can either read or write information on the dataline upon request from the master device. Figure 1 shows the basic bus connections between master and slave device. The buses are shared by a number of devices and are pulled HIGH by a pull-up resistor. Serial Interface Specifications Figure 2 shows the basic transmission specification. To begin and end a transmission, the master device generates a start signal (S) and a stop signal (P). Start (S) is defined as switching the Sdata from HIGH to LOW while the Sclk is at HIGH. Similarly, stop (P) is defined as switching the Sdata from LOW to HIGH while holding the Sclk HIGH. Between these two signals, data on Sdata is synchronous with the clock on the Sclk. Document #: 38-07589 Rev. *B Data is allowed to change only at LOW period of clock, and must be stable at the HIGH period of clock. To acknowledge, drive the Sdata LOW before the Sclk rising edge and hold it LOW until the Sclk falling edge. Serial Interface Format Each slave carries an address. The data transfer is initiated by a start signal (S). Each transfer segment is one byte in length. The slave address and the read/write bit are first sent from the master device after the start signal. The addressed slave device must acknowledge (Ack) the master device. Depending on the Read/Write bit, the master device will either write data into (logic 0) or read data (logic 1) from the slave device. Each time a byte of data is successfully transferred, the receiving device must acknowledge. At the end of the transfer, the master device will generate a stop signal (P). Serial Interface Transfer Format Figure 2 shows the serial interface transfer format used with the CY2XP304. Two dummy bytes must be transferred before the first data byte. The CY2XP304 has only three bytes of latches to store information, and the third byte of data is reserved. Extra data will be ignored. Page 2 of 11 CY2XP304 Rp S d a ta S clk V DD Rp S d ata _ C S d ata _ C S c lk _ C S d ata _ in S clk _ in S d ata _ in S clk _ in M a s te r D e vic e S lav e D ev ice Figure 1. Device Connections S clk S data Start (S) valid data Stop (P) Acknowledge Figure 2. Serial Interface Specifications 1 bit 7 bits S Slave Address Data 1 1 bit Ack 8 bits R/W 1 bit 8 bits Ack 1 bit 8 bits 1 bit Ack Dummy Byte 1 Ack Dummy Byte 0 8 bits 1 bit Data 0 Ack P 1 bit Figure 3. CY2XP304 Transfer Format Serial Interface Address for the CY2XP304 A6 A5 A4 A3 A2 A1 A0 R/W 1 1 0 0 1 0 1 0 Serial Interface Programming for the CY2XP304 b7 b6 b5 b4 b3 b2 b1 b0 Data0 QCNTBYP SELPQ Q<5> Q<4> Q<3> Q<2> Q<1> Q<0> Data1 P<7> P<6> P<5> P<4> P<3> P<2> P<1> P<0> Data2 Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved To program the CY2XP304 using the two-wire serial interface, set the SELPQ bit HIGH. The default setting of this bit is LOW. The P and Q values are determined by the following formulas: Pfinal = (P7..0 + 3) * 2 Qfinal = Q5..0 + 2 Document #: 38-07589 Rev. *B If the QCNTBYP bit is set HIGH, then Qfinal defaults to a value of 1. The default setting of this bit is LOW. If the SELPQ bit is set LOW, the PLL multipliers will be set using the values in the Select Function Table. CyberClocks™ has been developed to generate P and Q values for stable PLL operation. This software is downloadable from www.cypress.com. Page 3 of 11 CY2XP304 PLL Frequency = Reference x P/Q = Output Reference Q Φ Output VCO P PLL Figure 4. PLL Block Diagram Functional Specifications State Transition Characteristics Crystal Input Specifies the maximum settling time of the CLK and CLKB outputs from device power-up. For VDD and VDDX any sequences are allowed to power-up and power-down the CY2XP304. The CY2XP304 receives its reference from an external crystal. Pin XIN is the reference crystal input, and pin XOUT is the reference crystal feedback. The parameters for the crystal are given on page 5 of this data sheet. The oscillator circuit requires external capacitors. Please refer to the application note entitled Crystal Oscillator Topics for details. Select Input There are two select input pins, the PLL_MULT and CLK_SEL. PLL_MULT pin selects the frequency multiplier in the PLL, and is a standard LVCMOS input. The S pin has an internal pull-up resistor. The multiplier selection is given on page 2 of this data sheet (see Frequency Table). Document #: 38-07589 Rev. *B State Transition Characteristics From To VDD/VDD CLK/CLK B Normal X On Transition Latency 3 ms Description Time from VDD/VDDX is applied and settled to CLK/CLKB outputs settled. Page 4 of 11 CY2XP304 Absolute Maximum Conditions Parameter Description Condition Min. Max. Unit VCC Supply Voltage Non-functional –0.3 4.6 V VCC Operating Voltage Functional 3.135 3.465 V VTT Output Termination Voltage Relative to VCC[1] VIN Input Voltage Relative to VCC[1] –0.3 VCC + 0.3 V VOUT Output Voltage Relative to VCC[1] –0.3 LUI Latch Up Immunity Functional TS Temperature, Storage Non-functional –65 +150 °C TA Temperature, Operating Ambient Functional –40 +85 °C TJ Temperature, Junction Non-functional ØJc Dissipation, Junction to Case Functional 11.38 °C/W ØJa Dissipation, Junction to Ambient Functional 85.83 °C/W ESDh ESD Protection (Human Body Model) 2000 V MSL Moisture Sensitivity Level 3 N.A. GATES Total Functional Gate Count 50 Ea. VCC – 2 V VCC + 0.3 V 100 – Assembled die mA 150 °C Crystal Requirements Requirements to use parallel mode fundamental xtal. External capacitors are required in the crystal oscillator circuit. Please refer to the application note entitled Crystal Oscillator Topics for details. Crystal Requirements Parameter XF Description Frequency Min. Max. Unit 10 31.25 MHz Min. Max. Unit DC Electrical Specifications Parameter Description VDD Supply voltage 3.135 3.465 V VIL Input signal low voltage at pin PLL_MULT – 0.35 V VIH Input signal high voltage at pin PLL_MULT 0.65 – V RPUP Internal pull-up resistance 10 100 kΩ tPU Power-up time for all VDDs to reach minimum specified voltage (power ramps must be monotonic) 0.05 500 ms Min. Max. Unit 0 70 °C –40 85 °C Operating Conditions Parameter TA Description Commercial Temperature Industrial Temperature Note: 1. Where VCC is 3.3V±5% Document #: 38-07589 Rev. *B Page 5 of 11 CY2XP304 DC Specifications (VCC = 3.3 V ± 5%, Commercial and Industrial temp.) Parameter Description Condition Min. Max. Unit Clock Input Pair INA, INAB (HSTL differential signals) VDIF HSTL Differential Input Voltage[2] 0.4 1.9 V VX HSTL Differential Crosspoint Voltage[3] 0.68 0.9 V IIN Input Current |150| uA VIN = VX ± 0.2V PECL Outputs CLK[0:3], CLK[0:3]B (PECL differential signals) VOL Output Low Voltage VCC = 3.3V ± 5% IOL = –5 mA[4] VCC – 1.995 VCC – 1.5 V VOH Output High Voltage IOH = –30 mA[4] VCC – 1.25 VCC – 0.7 V 150 mA Supply Current and VBB IEE Maximum Quiescent Supply Current without Output Termination Current CIN Input Pin Capacitance LIN Pin Inductance INA, INAB 3 pF 1 nH AC Electrical Specifications–Input Min. Max. Unit fIN Parameter Input frequency with driven reference, crystal inputs 1 133 MHz fXTAL,IN Input frequency with crystal input 10 31.25 MHz fINA_IN Input Frequency with INA/INAB inputs 0 1500 MHz pin[5] – 10 pF CIN,CMOS Description Input capacitance at PLL_MULT AC Specifications–PECL Clock Outputs CLK[0:3], CLK[0:3]B Parameter Description Min. Max. Unit 125 500 MHz 0 1500 MHz 0.375 – V VCC – 1.425 V 400-MHz 50% duty cycle Standard load Differential Operation – 50 ps Part-to-part output skew 400-MHz 50% duty cycle Standard load Differential Operation – 150 ps TR,TF Output Rise / Fall time 400-MHz 50% duty cycle Differential 20% to 80% – 0.3 ns DC Long-term average output duty cycle 45 55 % tDC,ERR Cycle-cycle duty cycle error at x8 with 15.625-MHz input – 70 ps Phase Noise Phase Noise at 10 kHz (x8 mode) @ 125 MHz –107 –92 dBc BWLOOP PLL Loop Bandwidth fO Output Frequency Vo(P-P) Differential output voltage (peak-to-peak) VCMRO Output Common Voltage Range tsk(O) Output-to-output skew tsk(PP) Conditions CLK_SEL = 0 CLK_SEL = 1 fO < 1GHz 50 kHz (–3 dB) Notes: 2. VDIF (DC) is the amplitude of the differential HSTL input voltage swing required for device functionality. 3. VX (DC) is the crosspoint of the differential HSTL input signal. Functional operations is obtained when the crosspoint is within the VX (DC) range and the input swing lies within the VDIF (DC) specification. 4. Equivalent to a termination of 50Ω to VTT. 5. Capacitance measured at freq. = 1 MHz, DC Bias = 0.9V, and VAC < 100 mV. Document #: 38-07589 Rev. *B Page 6 of 11 CY2XP304 AC Specifications–PECL Clock Outputs CLK[0:3], CLK[0:3]B (continued) Parameter tJCRMS tJCPK tJPRMS tJPPK tJLT tJLT tJLT Description Cycle-to-cycle RMS jitter Cycle-to-cycle jitter (pk-pk) Period jitter RMS Period jitter (pk-pk) Min. Max. Unit At 125-MHz frequency Conditions – 15 ps At 400-MHz frequency – 10 ps At 500-MHz frequency – 12 ps At 125-MHz frequency – 95 ps At 200-MHz frequency, XF = 25 MHz – 65 ps At 400-MHz frequency – 55 ps At 500-MHz frequency – 65 ps At 125-MHz frequency – 6.8 ps At 400-MHz frequency – 5.6 ps At 500-MHz frequency – 6.8 ps At 125-MHz frequency – 55 ps At 200-MHz frequency, XF = 25 MHz – 50 ps At 400-MHz frequency – 45 ps At 500-MHz frequency – 50 ps At 125-MHz frequency – 25 ps At 400-MHz frequency – 20 ps At 500-MHz frequency – 25 ps Long term RMS Jitter (20 < P < 40) At 125-MHz frequency – 55 ps At 400-MHz frequency – 65 ps Long term RMS Jitter (P < 20) At 500-MHz frequency – 55 ps Long-term RMS Jitter (40 < P < 60) At 125-MHz frequency – 70 ps At 400-MHz frequency – 90 ps At 500-MHz frequency – 65 ps AC Electrical Specifications–PECL Clock Outputs: PLL Bypass Mode Parameter Description Conditions Vo(P-P) Differential output voltage (peak-to-peak) Differential PRBS fo < 1.0 GHz JP Period Jitter 660 MHz 50% duty cycle Standard load TPD Propagation delay (INA/INAB to output) Min Max Unit 0.375 – V – 1.3 ps r.m.s. PECL, 660MHz 280 650 ps HSTL, <1 GHz 280 750 ps tr, tf, 2 0 -8 0 % VO Figure 5. ECL/LVPECL Output Document #: 38-07589 Rev. *B Page 7 of 11 CY2XP304 Jitter This section defines the specifications that relate to timing uncertainty (or jitter) of the input and output waveforms. Figure 6 shows the definition of period jitter with respect to the falling edge of the CLK signal. Period jitter is the difference between the minimum and maximum cycle times over many cycles (typically 12800 cycles at 400 MHz). Equal requirements apply for rising edges of the CLK signal. tJP is defined as the output period jitter. Figure 7 shows the definition of cycle-to-cycle jitter with respect to the falling edge of the CLK signal. Cycle-to-cycle jitter is the difference between cycle times of adjacent cycles over many cycles (typically 12800 cycles at 400 MHz). Equal requirements apply for rising edges of the CLK signal. tJC is defined as the clock output cycle-to-cycle jitter. Figure 8 shows the definition of cycle-to-cycle duty cycle error. Cycle-to-cycle duty cycle error is defined as the difference between high-times of adjacent cycles over many cycles (typically 12800 cycles at 400 MHz). Equal requirements apply to the low-times. tDC,ERR is defined as the clock output cycle-to-cycle duty cycle error. Figure 9 shows the definition of long-term jitter error. Long-term jitter is defined as the accumulated timing error over many cycles (typically 12800 cycles at 400 MHz). It applies to both rising and falling edges. tJLT is defined as the long-term jitter. CLK CLKB tCYCLE tJP = tCYCLE,max – tCYCLE, min. over many cycles Figure 6. Period Jitter CLK CLKB tCYCLE,i tCYCLE, i+1 tJC = tCYLCE,i – tCYCLE,i+1 over many consecutive cycles Figure 7. Cycle-to-cycle Jitter CLK Cycle i Cycle i+1 CLKB tPW+,i+1 tCYCLE,i+1 tPW+,i tCYCLE, i+1 tDC,ERR = tPW+,i – tPW+,i+1 over many consecutive cycles Figure 8. Cycle-to-cycle Duty Cycle Error CLK CLKB tmin tmax tJLT = tmax – tmin over many cycles Figure 9. Long-term Jitter Document #: 38-07589 Rev. *B Page 8 of 11 CY2XP304 Test Configurations Standard test load using a differential pulse generator and differential measurement instrument. VTT DUT XTAL OSC R T = 50 ohm 5" PLL Zo = 50 ohm 5" VTT R T = 50 ohm VTT Pulse Generator Z = 50 ohm Zo = 50 ohm VTT CLK_SEL Figure 10. CY2XP304 AC Test Reference Applications Information Termination Examples 1 .3 V V C C = 3 .3 V R T = 50 ohm Zo = 50 ohm XTAL R T = 50 ohm 1 .3 V C lo c k VEE = 0V Figure 11. Standard LVPECL–PECL Output Termination 3 .3 V V C C = 3 .3 V 120 ohm Zo = 50 ohm XTAL LVDS 33 ohm ( 2 p la c e s ) 120 ohm 3 .3 V 51 ohm ( 2 p la c e s ) C lo c k VEE = 0V L V P E C L to LVDS Figure 12. Low-Voltage Positive Emitter-Coupled Logic (LVPECL) to a Low-voltage Differential Signaling (LVDS) Interface Document #: 38-07589 Rev. *B Page 9 of 11 CY2XP304 Ordering Information Ordering Code Package Type Operating Range CY2XP304BVC 36-lead VFBGA Commercial, to 400 MHz Operating Voltage 3.3V CY2XP304BVCT 36-lead VFBGA – Tape and Reel Commercial, to 400 MHz 3.3V CY2XP304BVI 36-lead VFBGA Industrial, to 400 MHz 3.3V CY2XP304BVIT 36-lead VFBGA – Tape and Reel Industrial, to 400 MHz 3.3V Package Drawing and Dimensions 36-Lead VFBGA (6 x 8 x 1 mm) BV36A Dimensions are in mm. 51-85149-*B CyberClocks is a trademark of Cypress Semiconductor. All product and company names mentioned in this document may be the trademarks of their respective holders. Document #: 38-07589 Rev. *B Page 10 of 11 © Cypress Semiconductor Corporation, 2004. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. CY2XP304 Document History Page Document Title: CY2XP304 High-Frequency Programmable PECL Clock Generation Module Document Number: 38-07589 REV. ECN NO. Issue Date Orig. of Change Description of Change ** 129898 12/02/03 RGL New Data Sheet *A 235868 See ECN RGL Updated Jitter spec based on the characterization report *B 247601 See ECN RGL/GGK Document #: 38-07589 Rev. *B Changed VOH and VOL to match the Char Data Page 11 of 11