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| 5V/3.3V DUAL PHASE LOCKED LOOP ClockWorksTM SY89420V FEATURES s 3.3V and 5V power supply options s 1.12GHz maximum VCO frequency s 30MHz to 560MHz reference input operating frequency s Frequency doubler mode s Low jitter design s PECL differential outputs s PECL and TTL reference voltages available s External loop filter optimizes performance/cost s Available in 28-pin PLCC package DESCRIPTION The SY89420V device consists of two identical, low jitter, digital Phase Locked Loops based on Micrel-Synergy's differential PLL technology. Each of the PLLs (PLLA and PLLB) is capable of operating in the 30MHz to 560MHz input reference frequency range independently of the other and is configurable separately. The PLLs can be configured to be matched in all regards, or can be configured so that PLLB is used as a frequency doubler, while PLLA is used to regenerate the undoubled frequency. Two reference inputs (RINX and RINX), two feedback inputs (FINX and FINX), two filter pins (F1X and F2X) and two differential outputs (FOUTX and FOUTX) are provided for each of the two PLLs. The reference and feedback inputs can be used as either differential or single-ended inputs. In single-ended mode RINX and FINX can be connected to either VBB for normal 100K PECL levels or VTH for normal TTL levels. Feedback for the loops is realized by connecting FOUTX, FOUTX to FINX, FINX by means of external circuitry. This allows the user the flexibility of inserting additional circuitry off-chip in the feedback paths, such as a divider. Pulldown resistors are required for the FOUTX and FOUTX pins. Use of a phase-frequency detector results in excellent PLL locking and tracking characteristics. Error correction voltages are generated by the detector if either phase or frequency deviations occur. The VCO has a frequency range covering more than a 2:1 ratio from 480MHz to 1120MHz. Select pins S1X and S2X are used to program the N dividers for optimum VCO operation, in other words with the VCO in the center of its range. Additional select pins, S3B and S4B, are provided for PLLB. When both S3B and S4B are low, PLLB is identical to PLLA. When S3B is high, NB can be set to 1, 10, 18, or 20. When S4B is high, the frequency doubler option is enabled (P = 2). All Select pins are TTL compatible. APPLICATIONS s s s s Workstations Advanced communications High-end consumer High-performance computing PIN CONFIGURATION S2B 25 24 23 22 21 20 19 VCCOB FOUTB FOUTB VCC FOUTA FOUTA VCCOA 26 27 28 1 2 3 4 5 6 7 8 9 10 11 18 17 S4B RINB RINB VEE RINA RINA VBB FINB S1B S3B F1B F2B FINB 16 15 14 13 12 TOP VIEW PLCC J28-1 VTH FINA FINA S1A S2A F1A F2A Rev.: K Amendment: /0 1 Issue Date: May 2000 Micrel ClockWorksTM SY89420V BLOCK DIAGRAM F1A F2A RINA D RINA PHASE-FREQUENCY DETECTOR FINA D FINA LOOP FILTER VCO S1A S2A / NA (2, 4, 8, 16) FOUTA FOUTA VBB VTH FOUTB FOUTB RINB D RINB PHASE-FREQUENCY DETECTOR FINB FINB S4B F1B F2B /P (1, 2) S1B S2B S3B / NB (1,2,4,8,10,12,16,20) VCO LOOP FILTER 2 Micrel ClockWorksTM SY89420V LOOP FILTER COMPONENT SELECTION PIN DESCRIPTION RINA, RINA, RINB, RINB Reference frequency inputs for loop A and B. These are differential signal pairs and may be driven differentially or single-ended. FINA, FINA, FINB, FINB Feedback frequency inputs for loop A and B. These are differential signal pairs and may be driven differentially or single-ended. VBB, VTH These are the reference voltages for use as bias for the frequency inputs. The references are generated on-chip. VBB is PECL compatible, while VTH is TTL compatible. F1A, F2A, F1B, F2B These pins are connection points for the loop filters, which are to be provided off-chip. F1X is the high impedance side, F2X is the reference side. The loop filter should be a first order, low pass with a DC block. The difference voltage on these pins will be a DC level, which is controlled by the loop feedback and determined by the required VCO frequency. FOUTA, FOUTA, FOUTB, FOUTB Frequency outputs for the loops. These are differential, positive referenced, emitter-follower signals and must be terminated off-chip. Termination in 50 ohms is recommended. S1A, S2A, S1B, S2B, S3B, S4B These inputs are used to select the configuration for PLLA and PLLB. They are compatible with standard TTL signal levels. See the Frequency Selection Table for details of the logic. VCC This is the positive supply for the entire chip excluding output buffers. It should be decoupled and present a very low impedance in order to assure low-jitter operation. VCCOA, VCCOB These are the positive supplies for the output buffers. They are constrained to be equal to the value of VCC. They should be decoupled and present a very low impedance in order to assure low-jitter operation. VEE This pin is the negative supply for the chip and is normally connected to ground (0V). R C F1X F2X C R = = 1.0F 10% (X7R dielectric) 560 10% PIN NAMES Pin F1A F2A RINA RINA FINA FINA FOUTA FOUTA F1B F2B RINB RINB FINB FINB FOUTB FOUTB VCC VCCOA VCCOB VEE VBB VTH S1A S2A S1B S2B S3B S4B Filter Pin 1A Filter Pin 2A Reference Input A Inverted Reference Input A Feedback Input A Inverted Feedback Input A Frequency Output A Inverted Frequency Output A Filter Pin 1B Filter Pin 2B Reference Input B Inverted Reference Input B Feedback Input B Inverted Feedback Input B Frequency Output B Inverted Frequency Output B VCC Output A VCC Output B VCC VEE (0V) PECL Threshold Voltage TTL Threshold Voltage Select Input 1A (TTL) Select Input 2A (TTL) Select Input 1B (TTL) Select Input 2B (TTL) Select Input 3B (TTL) Select Input 4B (TTL) Function I/O I/O I/O I I I I O O I/O I/O I I I I O O -- -- -- -- O O I I I I I I 3 Micrel ClockWorksTM SY89420V FREQUENCY SELECTION TABLE PLLA S2A 0 0 1 1 S1A 0 1 0 1 Divide-by-N N=2 N=4 N=8 N = 16 Output Frequency Range (MHz) 240 - 560 120 - 280 60 - 140 30 - 70 PLLB S3B 0 0 0 0 1 1 1 1 S2B 0 0 1 1 0 0 1 1 S1B 0 1 0 1 0 1 0 1 Divide-by-N N =2 N=4 N=8 N = 16 N=1 N = 10 N = 12 N = 20 Output Frequency Range (MHz) 240 - 560 120 - 280 60 - 140 30- 70 480 - 1120 48 - 112 40 - 93.3 24 - 56 S4B 0 1 Divide-by-P P =1 P=2 Max. Feedback Frequency (MHz) 560 1120 ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VI II IOUT Parameter Power Supply Voltage TTL Input Voltage TTL Input Current (2) Value -0.5 to +7.0 -0.5 to 6.0 -30 to +5.0 50 100 -65 to +150 0 to +85 Unit V V mA mA (2) ECL Output Current -- Continuous -- Surge Storage Temperature Operating Temperature Range(3) Tstore TA C C NOTES: 1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATING conditions for extended periods may affect device reliability. 2. Either voltage limit or current limit is sufficient to protect input. 3. All DC and AC electrical characteristics are specified over the operating temperature range. 4 Micrel ClockWorksTM SY89420V 5V DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 5.0V 5% Symbol VCC ICC ICCO Parameter Power Supply Voltage Power Supply Current (VCC) Power Supply Current (VCCO) Min. 4.75 -- -- Typ. -- -- -- Max. 5.25 200 28 Unit V mA mA PECL outputs are open Condition VCC = VCCO 3.3V DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V 5% Symbol VCC ICC ICCO Parameter Power Supply Voltage Power Supply Current (VCC) Power Supply Current (VCCO) Min. 3.135 -- -- Typ. -- -- -- Max. 3.465 200 28 Unit V mA mA PECL outputs are open Condition VCC = VCCO PECL DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V or 5.0V 5% Symbol VOH VOL VIH VIL VBB Parameter Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage PECL Threshold Min. VCC - 1.025 VCC - 1.810 VCC - 1.165 VCC - 1.810 -- Typ. -- -- -- -- VCC - 1.35 Max. VCC - 0.780 VCC - 1.520 VCC - 0.780 VCC - 1.475 -- Unit V V V V V Condition TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V or 5.0V 5% Symbol VIH VIL IIH IIL VIK VTH Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Input Clamp Voltage TTL Threshold Min. 2.0 -- -- -- -- -- Typ. -- -- -- -- -- 1.5 Max. -- 0.8 20 100 -0.3 - 1.2 -- Unit V V A mA V V VIN = 2.7V VIN = VCC VIN = 0.5V IIN = -12mA Condition 5 Micrel ClockWorksTM SY89420V AC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V or 5.0V 5% Symbol PPW tr tf FOUTA FOUTB RINA, B Parameter Output Period Jitter Output Duty Cycle Output Rise/Fall Time (20% to 80%) Output Frequency PLLA Output Frequency PLLB Input Frequency PLLA, B Min. -- 45 -- -- -- -- -- Typ. 10 50 300 300 -- -- -- Max. 15 55 550 550 560 1120 560 Unit ps rms % ps MHz MHz MHz S4B=1 -- Condition APPLICATION RINA 50MHz Clock FINA 16MHz SY89429A S2A = 1 S1A = 1 PLLA OUTA SY100H641 OUTA 50MHz RINB PLLB FINB OUTB SY100H842 OUTB 100MHz S4B = 1 S3B = 1 SY89420V S1B = 1 S2B = 0 50MHz Low Skew Clock System with 100MHz Clock to CPU PRODUCT ORDERING CODE Ordering Code SY89420VJC SY89420VJCTR Package Type J28-1 J28-1 Operating Range Commercial Commercial 6 Micrel ClockWorksTM SY89420V 28 LEAD PLCC (J28-1) Rev. 03 7 Micrel ClockWorksTM SY89420V MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA FAX + 1 (408) 980-9191 + 1 (408) 914-7878 WEB http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated 8 |
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