5V/3.3V HIGH-PERFORMANCE PHASE LOCKED LOOP FEATURES 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 ■ Low jitter differential design ■ Frequency doubler mode ■ PECL Differential output ■ External loop filter optimizes performance/cost ■ Available in 20-pin SOIC package 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 ■ Workstations ■ Advanced communications ■ High-performance computing PIN CONFIGURATION S1 1 20 S2 FIN 2 19 RIN FIN 3 18 RIN VEE 4 17 S3 F1 5 16 VCC F2 6 15 FOUT S5 7 14 FOUT HFIN 8 13 VCCO HFIN 9 12 HFOUT 11 HFOUT S4 10 ClockWorks™ SY89421V TOP VIEW SOIC Z20-1 Rev.: F 1 Amendment: /0 Issue Date: May 2000 ClockWorks™ SY89421V Micrel BLOCK DIAGRAM F1 F2 HFIN LOOP FILTER RIN D HFIN RIN ÷2 PHASE-FREQUENCY DETECTOR FIN FIN VCO ÷P (1, 2) S4 0 1 MUX 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 = 1.0µF ±10% (X7R dielectric) R = 560Ω ±10% 2 ClockWorks™ SY89421V Micrel PIN NAMES Pin PIN DESCRIPTION Function RIN, RIN Reference frequency inputs. These are differential signal pairs and may be driven differentially or single-ended. I/O F1 Filter Pin 1 I/O F2 Filter Pin 2 I/O RIN Reference Input I RIN Inverted Reference Input I FIN Feedback Input I FIN Inverted Feeback Input I HFIN High Frequency Input I HFIN Inverted High Frequency Input I HFOUT High Frequency Output O HFOUT Inverted High Frequency Output O FOUT Frequency Output O FOUT Inverted Frequency Output O VCC VCC — VCCO Output VCC — VEE VEE (0V) — S1 Select Input 1 (TTL) I S2 Select Input 2 (TTL) I S3 Select Input 3 (TTL) I S4 Select Input 4 (TTL) I S5 Select Input 5 (TTL) I 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 ClockWorks™ SY89421V Micrel FREQUENCY SELECTION TABLE S4 S3 S2 S1 N FOUT Freq. Range MHz HFOUT Freq. Range 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 20 – 56 480 – 1120 1 0 0 0 2 HFIN divide by 4 HFIN divide by 2 1 0 0 1 4 HFIN divide by 8 HFIN divide by 2 1 0 1 0 8 HFIN divide by 16 HFIN divide by 2 1 0 1 1 16 HFIN divide by 32 HFIN divide by 2 1 1 0 0 1 HFIN divide by 2 HFIN divide by 2 1 1 0 1 10 HFIN divide by 20 HFIN divide by 2 1 1 1 0 12 HFIN divide by 24 HFIN divide by 2 1 1 1 1 20 HFIN divide by 40 HFIN divide by 2 S5 Divide-by-P Maximum Feedback Frequency (MHz) 0 P= 1 560 1 P= 2 1120 ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC Parameter Unit –0.5 to +7.0 V VI (2) TTL Input Voltage –0.5 to 6.0 V II TTL Input Current(2) –30 to +5.0 mA IOUT ECL Output Current — Continuous — Surge Tstore TA Power Supply Voltage Value mA 50 100 Storage Temperature (3) Operating Temperature Range –65 to +150 °C 0 to +85 °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 termperature range. 4 ClockWorks™ SY89421V Micrel 5V DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 5.0V ±5% Symbol Parameter Min. Typ. Max. Unit VCC Power Supply Voltage 4.75 — 5.25 V ICC Power Supply Current (VCC) — — 100 mA ICCO Power Supply Current (VCCO) — — 28 mA Condition VCC = VCCO PECL outputs are open 3.3V DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 3.3V ±5% Symbol Parameter Min. Typ. Max. Unit VCC Power Supply Voltage 3.135 — 3.465 V ICC Power Supply Current (VCC) — — 100 mA ICCO Power Supply Current (VCCO) — — 28 mA Condition VCC = VCCO PECL outputs are open PECL DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 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 Condition TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCO = 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 5 IIN = –12mA ClockWorks™ SY89421V Micrel AC ELECTRICAL CHARACTERISTICS VCC = VCCO = 3.3V or 5.0V ±5% Symbol ∆Τ Parameter Min. Typ. Max. Unit 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 RIN Reference Frequency Input — — 560 MHz FIN Feedback Frequency Input — — — — 560 1120 MHz MHz HFIN High Frequency Input — — 2000 MHz HFOUT High Frequency Output — — 1120 MHz FOUT Frequency Output — — 1120 MHz PRODUCT ORDERING CODE Odering Code Package Type Operating Range SY89421VZC Z20-1 Commercial SY89421VZCTR Z20-1 Commercial 6 Condition — S5 = 0 S5 = 1 ClockWorks™ SY89421V Micrel 20 LEAD SOIC .300" WIDE (Z20-1) Rev. 03 7 ClockWorks™ SY89421V 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