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| 5V/3.3V HIGH-PERFORMANCE PHASE LOCKED LOOP FEATURES s 3.3V and 5V power supply options s 1.12GHz maximum VCO frequency s 30MHz to 560MHz reference input operating frequency s External 2.0GHz VCO capability s Low jitter differential design s Frequency doubler mode s PECL Differential output s External loop filter optimizes performance/cost s Available in 20-pin SOIC package ClockWorksTM SY89421V DESCRIPTION The SY89421V is a digital Phase Locked Loop based on Micrel-Synergy's differential PLL technology. It is capable of operating in the 30MHz to 560MHz reference input frequency range, and up to 2000MHz with the HFIN input and an external VCO. 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. Feedback for the loop is realized by connecting FOUT, FOUT to FIN, FIN by means of external circuitry. This allows the flexibility of inserting additional circuitry off-chip in the feedback paths, such as an additional divider and/or buffer. Pulldown resistors are required for the FOUT and FOUT pins. High frequency inputs HFIN, HFIN and corresponding outputs HFOUT, HFOUT are featured for use with external components such as an active loop filter and a high frequency VCO. Select pins S1 and S2 are used to program the N divider for optimum VCO operation, in other words with the VCO in the center of its range. Select pin S3 allows bypassing the N divider enabling the PLL to output the VCO directly. Select pin S4 is used to select off-chip or on-chip VCO. Select pin S5 enables the divide-by-two prescaler, which is useful in frequency doubling applications. All Select pins are TTL compatible. APPLICATIONS s Workstations s Advanced communications s High-performance computing PIN CONFIGURATION S1 FIN FIN VEE F1 F2 S5 HFIN HFIN 1 2 3 4 5 6 7 8 9 20 19 18 17 S2 RIN RIN S3 VCC FOUT FOUT VCCO HFOUT HFOUT TOP VIEW SOIC Z20-1 16 15 14 13 12 11 S4 10 Rev.: F Amendment: /0 1 Issue Date: May 2000 Micrel ClockWorksTM SY89421V BLOCK DIAGRAM F1 F2 HFIN HFIN /2 RIN D LOOP FILTER RIN PHASE-FREQUENCY DETECTOR VCO FIN FIN /P (1, 2) S4 0 MUX 1 S5 HFOUT HFOUT /N (1,2,4,8,10,12,16,20) S1 S2 S3 FOUT FOUT LOOP FILTER COMPONENT SELECTION R C F1 F2 C R = 1.0F 10% (X7R dielectric) = 560 10% 2 Micrel ClockWorksTM SY89421V PIN NAMES Pin F1 F2 RIN RIN FIN FIN HFIN HFIN HFOUT HFOUT FOUT FOUT VCC VCCO VEE S1 S2 S3 S4 S5 Filter Pin 1 Filter Pin 2 Reference Input Inverted Reference Input Feedback Input Inverted Feeback Input High Frequency Input Inverted High Frequency Input High Frequency Output Inverted High Frequency Output Frequency Output Inverted Frequency Output VCC Output VCC VEE (0V) Select Input 1 (TTL) Select Input 2 (TTL) Select Input 3 (TTL) Select Input 4 (TTL) Select Input 5 (TTL) Function I/O I/O I/O I I I I I I O O O O -- -- -- I I I I I PIN DESCRIPTION RIN, RIN Reference frequency inputs. These are differential signal pairs and may be driven differentially or single-ended. FIN, FIN Feedback frequency inputs. These are a differential signal pair and may be driven differentially or single-ended. HFIN, HFIN High frequency feedback inputs. These are a differential signal pair. Differential drive is recommended. F1, F2 These pins are connection points for the loop filter, which is to be provided off-chip. F1 is the high impedance side, F2 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. FOUT, FOUT 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. HFOUT, HFOUT High frequency output. These are a differential signal pair. Termination in 50 ohms is recommended. S1, S2, S3, S4, S5 These are the frequency select inputs, and are used to configure the PLL. 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 chip. It should be decoupled and should present a very low impedance in order to assure low-jitter operation. VCCO This is the positive supply for the output buffer. It is constrained to be equal to or less than the value of VCC. It should be decoupled and should present a very low impedance for lowjitter. VEE This pin is the negative supply for the chip and is normally connected to ground (0V). 3 Micrel ClockWorksTM SY89421V FREQUENCY SELECTION TABLE FOUT Freq. Range MHz 240 - 560 120 - 280 60 - 140 30 - 70 480 - 1120 48 - 112 40 - 93.3 20 - 56 HFIN divide by 4 HFIN divide by 8 HFIN divide by 16 HFIN divide by 32 HFIN divide by 2 HFIN divide by 20 HFIN divide by 24 HFIN divide by 40 HFOUT Freq. Range MHz 480 - 1120 480 - 1120 480 - 1120 480 - 1120 480 - 1120 480 - 1120 480 - 1120 480 - 1120 HFIN divide by 2 HFIN divide by 2 HFIN divide by 2 HFIN divide by 2 HFIN divide by 2 HFIN divide by 2 HFIN divide by 2 HFIN divide by 2 S4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 S3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 S2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 S1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 N 2 4 8 16 1 10 12 20 2 4 8 16 1 10 12 20 S5 0 1 Divide-by-P P= 1 P= 2 Maximum Feedback Frequency (MHz) 560 1120 ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VI II IOUT Parameter Power Supply Voltage TTL Input Voltage (2) Value -0.5 to +7.0 -0.5 to 6.0 -30 to +5.0 50 100 -65 to +150 Unit V V mA mA TTL Input Current(2) ECL Output Current -- Continuous -- Surge Storage Temperature Operating Temperature Range (3) Tstore TA C C 0 to +85 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 termperature range. 4 Micrel ClockWorksTM SY89421V 5V DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 5.0V 5% Symbol VCC ICC ICCO Parameter Power Supply Voltage Power Supply Current (VCC) Power Supply Current (VCCO) Min. 4.75 -- -- Typ. -- -- -- Max. 5.25 100 28 Unit V mA mA PECL outputs are open Condition VCC = VCCO 3.3V DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 3.3V 5% Symbol VCC ICC ICCO Parameter Power Supply Voltage Power Supply Current (VCC) Power Supply Current (VCCO) Min. 3.135 -- -- Typ. -- -- -- Max. 3.465 100 28 Unit V mA mA PECL outputs are open Condition VCC = VCCO PECL DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 3.3V or 5.0V 5% Symbol VOH VOL VIH VIL Parameter Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Min. VCC - 1.025 VCC - 1.810 VCC - 1.165 VCC - 1.810 Typ. -- -- -- -- Max. VCC - 0.780 VCC - 1.520 VCC - 0.780 VCC - 1.475 Unit V V V V Condition TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 3.3V or 5.0V 5% Symbol VIH VIL IIH IIL VIK Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Input Clamp Voltage Min. 2.0 -- -- -- -- Typ. -- -- -- -- -- Max. -- 0.8 20 100 -0.3 - 1.2 Unit V V A mA V VIN = 2.7V VIN = VCC VIN = 0.5V IIN = -12mA Condition 5 Micrel ClockWorksTM SY89421V AC ELECTRICAL CHARACTERISTICS VCC = VCCO = 3.3V or 5.0V 5% Symbol PPW tr tf RIN FIN HFIN HFOUT FOUT Parameter Output Period Jitter Output Duty Cycle Output Rise/Fall Time (20% to 80%) Reference Frequency Input Feedback Frequency Input High Frequency Input High Frequency Output Frequency Output Min. -- 45 -- -- -- -- -- -- -- -- Typ. 10 50 300 300 -- -- -- -- -- -- Max. 15 55 550 550 560 560 1120 2000 1120 1120 Unit ps rms % ps MHz MHz MHz MHz MHz MHz S5 = 0 S5 = 1 -- Condition PRODUCT ORDERING CODE Odering Code SY89421VZC SY89421VZCTR Package Type Z20-1 Z20-1 Operating Range Commercial Commercial 6 Micrel ClockWorksTM SY89421V 20 LEAD SOIC .300" WIDE (Z20-1) Rev. 03 7 Micrel ClockWorksTM SY89421V 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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