5V/3.3V DUAL HIGH-PERFORMANCE PHASE LOCKED LOOP FEATURES ClockWorks™ SY89423V DESCRIPTION ■ 3.3V and 5V power supply options ■ 1.12GHz maximum VCO frequency ■ 30MHz to 560MHz reference input operating frequency ■ External 2.0GHz VCO capability ■ Frequency doubler mode ■ Low jitter differential design ■ PECL differential outputs ■ External loop filter optimizes performance/cost ■ Available in 44-pin PLCC package The SY89423V device consists of two identical, low jitter, digital Phase Locked Loops based on Micrel-Synergy's differential PLL technology. Each PLL is capable of operating in the 30MHz to 560MHz reference input frequency range, and is independent 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. Each PLL is capable of operating up to 2000MHz with the HFIN input and an external VCO. Two reference inputs (RINX and RINX), two feedback inputs (FINX and FINX), two high frequency inputs (HFINX and HFINX), two filter pins (F1X and F2X), two normal outputs (FOUTX and FOUTX), and two high frequency outputs (HFOUTX and HFOUTX) are provided for each of the two PLLs. The reference, feedback, and high frequency inputs can be used as either differential or single-ended inputs. External reference voltage generators are required for single-ended drive. 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 an additional divider. Pulldown resistors are required for the FOUTX and FOUTX pins, and for the HFOUTX and HFOUTX pins. Use of a phase-frequency detector in each PLL results in excellent locking and tracking characteristics. Error correction voltages are generated by the detector if either phase or frequency deviations occur. The VCO in each PLL has a frequency range covering more than a 2:1 ratio from 480MHz to 1120MHz. Select pins S1A, S2A, S1B, S2B, and S3B are used to program the N dividers for optimum VCO operation, in other words with the VCO operating in the center of its range. When both S3B and S5B are low, PLLB is identical to PLLA. When S5B is high, the 2X frequency multiplication option is enabled. Select pins S3A and S4B enable the HF inputs for PLLA and PLLB respectively, which allows the use of an external VCO in either PLL. All the select pins are TTL inputs. APPLICATIONS ■ Workstations ■ Advanced communications ■ High-performance computing V CC V CC NC 5 4 3 2 1 44 43 42 41 40 NC FOUTA 6 V CCOB FOUTA FOUTB V CCOA FOUTB NC PIN CONFIGURATION NC 7 39 NC HFOUTA 8 38 HFOUTB HFOUTA 9 37 HFOUTB S1A 10 36 S1B S2A 11 35 S2B F1A 12 34 F1B F2A 13 33 F2B S3A 14 32 S3B S5B 15 31 S4B HFINA 16 30 HFINB HFINA 17 29 HFINB TOP VIEW PLCC J44-1 FINB FINB RINB RINB NC V EE V EE RINA RINA FINA FINA 18 19 20 21 22 23 24 25 26 27 28 Rev.: G 1 Amendment: /0 Issue Date: May 2000 ClockWorks™ SY89423V Micrel BLOCK DIAGRAM ÷2 HFINA HFINA F1A RINA S3A F2A 1 LOOP FILTER D M U X RINA PHASE-FREQUENCY DETECTOR HFOUTA HFOUTA 0 VCO FINA D FINA S1A ÷ NA (2, 4, 8, 16) S2A FOUTA FOUTA FOUTB FOUTB S1B ÷ NB (1, 2, 4, 8, 10, 12, 16, 20) S2B S3B RINB D S4B RINB PHASE-FREQUENCY DETECTOR FINB ÷P (1, 2) 0 VCO M U X HFOUTB 1 LOOP FILTER FINB HFOUTB HFINB S5B F1B ÷2 F2B HFINB LOOP FILTER COMPONENT SELECTION R F1X C = 1.0µF ±10% (X7R dielectric) R = 560Ω ±10% C F2X 2 ClockWorks™ SY89423V Micrel PIN NAMES Pin PIN DESCRIPTION Function 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. I/O F1A Filter Pin 1A I/O F2A Filter Pin 2A I/O RINA Inverted Reference Input A I RINA Reference Input A I FINA Feedback Input A I FINA Inverted Feedback Input A I HFINA High Frequency Input A I HFINA Inverted High Frequency Input A I FOUTA Frequency Output A O FOUTA Inverted Frequency Output A O HFOUTA High Frequency Output A O HFOUTA Inverted High Frequency Output A O F1B Filter Pin 1B I/O F2B Filter Pin 2B I/O RINB Reference Input B I RINB Inverted Reference Input B I FINB Feedback Input B I FINB Inverted Feedback Input B I HFINB High Frequency Input B I HFINB Inverted High Frequency Input B I FOUTB Frequency Output B O FOUTB Inverted Frequency Output B O HFOUTB High Frequency Output B O HFOUTB Inverted Frequency Output B O VCC VCC — VCCOA Output VCC — VCCOB Output VCC — VEE VEE (0V) — S1A Select Input 1A (TTL) I S2A Select Input 2A (TTL) I S3A Select Input 3A (TTL) I S1B Select Input 1B (TTL) I S2B Select Input 2B (TTL) I S3B Select Input 3B (TTL) I S4B Select Input 4B (TTL) I S5B Select Input 5B (TTL) I 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. HFINA, HFINA, HFINB, HFINB High frequency feedback inputs. Differential drive is recommended. 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. HFOUTA, HFOUTA, HFOUTB, HFOUTB High frequency outputs. These are differential, positive referenced, emitter-follower signals and must be terminated off-chip. Termination in 50 ohms is recommended. S1A, S2A, S3A, S1B, S2B, S3B, S4B, S5B These inputs are used to select the configuration for PLLA and PLLB. See the Frequency Selection Table for details of the logic. VCC This is the positive supply for the chip. It should be decoupled and present a 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 or less than the value of VCC. VEE This pin is the negative supply for the chip and is normally connected to ground (0V). 3 ClockWorks™ SY89423V Micrel FREQUENCY SELECTION TABLE PLLA S3A S2A S1A NA FOUTA (MHz) HFOUTA (MHz) 0 0 0 2 240 – 560 480 – 1120 0 0 1 4 120 – 280 480 – 1120 0 1 0 8 60 – 140 480 – 1120 0 1 1 16 30 – 70 480 – 1120 1 0 0 2 HFINA divide by 4 HFINA divide by 2 1 0 1 4 HFINA divide by 8 HFINA divide by 2 1 1 0 8 HFINA divide by 16 HFINA divide by 2 1 1 1 16 HFINA divide by 32 HFINA divide by 2 PLLB S4B S3B S2B S1B NB FOUTB (MHz) HFOUTB (MHz) 0 0 0 0 2 240 – 560 480 – 1120 0 0 0 1 4 120 – 280 480 – 1120 0 0 1 0 8 60 – 140 480 – 1120 0 0 1 1 16 30 – 70 480 – 1120 0 1 0 0 1 480 – 1120 480 – 1120 0 1 0 1 10 48 – 112 480 – 1120 0 1 1 0 12 40 – 93.3 480 – 1120 0 1 1 1 20 1 0 0 0 2 HFINB divide by 4 HFINB divide by 2 1 0 0 1 4 HFINB divide by 8 HFINB divide by 2 1 0 1 0 8 HFINB divide by 16 HFINB divide by 2 1 0 1 1 16 HFINB divide by 32 HFINB divide by 2 1 1 0 0 1 HFINB divide by 2 HFINB divide by 2 1 1 0 1 10 HFINB divide by 20 HFINB divide by 2 1 1 1 0 12 HFINB divide by 24 HFINB divide by 2 1 1 1 1 20 HFINB divide by 40 HFINB divide by 2 24 – 56 Maximum Feedback Frequency (MHz) S5B Divide-by-P 0 P=1 560 1 P=2 1120 4 480 – 1120 ClockWorks™ SY89423V Micrel ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VI Parameter Power Supply Voltage –0.5 to +7.0 V –0.5 to 6.0 V (2) –30 to +5.0 mA TTL Input Voltage TTL Input Current IOUT ECL Output Current mA –Continuous –Surge TA Unit (2) II Tstore Value 50 100 Storage Temperature –65 to +150 °C 0 to +85 °C (3) Operating Temperature 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. 5V DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 5.0V ±5% Symbol Parameter Min. Typ. Max. Unit VCC Power Supply Voltage 4.75 — 5.25 V ICC Power Supply Current (VCC) — — 200 mA ICCO Power Supply Current (VCCO) — — 56 mA Condition VCC = VCCO PECL outputs are open 3.3V DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V ±5% Symbol Parameter Min. Typ. Max. Unit VCC Power Supply Voltage 3.135 — 3.465 V ICC Power Supply Current (VCC) — — 200 mA ICCO Power Supply Current (VCCO) — — 56 mA Condition VCC = VCCO PECL outputs are open PECL DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V or 5.0V ±5% Symbol Parameter Min. Typ. Max. Unit VOH Output HIGH Voltage VCC – 1.025 — VCC – 0.780 V VOL Output LOW Voltage VCC – 1.810 — VCC – 1.520 V VIH Input HIGH Voltage VCC – 1.165 — VCC – 0.780 V VIL Input LOW Voltage VCC – 1.810 — VCC – 1.475 V 5 Condition ClockWorks™ SY89423V Micrel TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V or 5.0V ±5% Symbol Parameter Min. Typ. Max. Unit Condition VIH Input HIGH Voltage 2.0 — — V VIL Input LOW Voltage — — 0.8 V IIH Input HIGH Current — — 20 100 µA VIN = 2.7V VIN = VCC IIL Input LOW Current — — –0.3 mA VIN = 0.5V VIK Input Clamp Voltage — — –1.2 V IIN = –12mA AC ELECTRICAL CHARACTERISTICS VCC = VCCOA = VCCOB = 3.3V or 5.0V ±5% Symbol Parameter Min. Typ. Max. Unit ∆Τ Output Period Jitter — 10 15 ps rms PPW Output Duty Cycle 45 50 55 % tr tf Output Rise/Fall Time (20% to 80%) — — 300 300 550 550 ps RINA, B Reference Frequency Inputs — — 560 MHz FINA, B FINB Feedback Frequency Inputs Feedback Frequency Input — — — — 560 1120 MHz MHz HFINA, B High Frequency Inputs — — 2000 MHz HFOUTA, B High Frequency Outputs — — 1120 MHz FOUTA Frequency Outputs PLLA — — 560 MHz FOUTB Frequency Outputs PLLB — — 1120 MHz PRODUCT ORDERING CODE Ordering Code Package Type Operating Range SY89423VJC J44-1 Commercial SY89423VJCTR J44-1 Commercial 6 Condition — S5B = 0 S5B = 1 ClockWorks™ SY89423V Micrel 44 LEAD PLCC (J44-1) Rev. 02 7 ClockWorks™ SY89423V Micrel MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA + 1 (408) 980-9191 FAX + 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. © 2000 Micrel Incorporated 8