5V/3.3V FREQUENCY SYNTHESIZER (60MHz to 1GHz) FEATURES ClockWorks™ SY89424V DESCRIPTION ■ 3.3V and 5V power supply options ■ Up to 1GHz clock frequencies ■ Internal quartz reference oscillator driven by quartz crystal or PECL source ■ Low jitter PLL design ■ On-chip 20 ohm driver ■ Differential outputs with 600mV (min) swing ■ Optional pull-down resistors for AC-coupled outputs ■ Low power consumption ■ External loop filter optimizes performance/cost ■ Available in 16-pin SOIC package The SY89424V is a low-power Phase Locked Loop (PLL) based frequency synthesizer. The device is capable of generating up to 1GHz clock frequencies with a low-cost 10–25MHz external series-resonant quartz crystal. One can also use PECL differential clock signals to drive this device instead of the quartz crystal. Operation of this chip is controlled by three select pins (S1, S2 and S3). S1 selects the divide ratio of 24 or 50 for the PLL. S2 and S3 select the output frequency. There are two pull-down resistor pins (PDR1 and PDR2). Each pin has an on-chip resistor that will control the output driver currents. When PDR1 and PDR2 pins are open, both outputs are normal open emitter PECL drivers. When PDR1 and PDR 2 pins are shorted to the outputs, on-chip pull down currents of 25mA (40mA at 5V VCC) are provided. Both output drivers are capable of driving 20 ohm clock lines. An output enable (OE) pin is available and it can be HIGH or left open for normal operation. When OE is LOW, a built-in Disable Timing Synchronizer will force the FOUT output to LOW at the completion of the HIGH clock cycle. The FOUT output remains HIGH during that time. BLOCK DIAGRAM F1A F2A LOOP FILTER XTAL1 OSC XTAL2 PHASE COMP CHARGE PUMP ÷ 24, ÷ 50 VCO S1A FOUT ÷ 1, 2, 3, 4 FOUT PDR1 PDR2 S2A S3A OE Rev.: G 1 Amendment: /0 Issue Date: May, 1998 ClockWorks™ SY89424V Micrel PIN NAMES PIN CONFIGURATION Pin VCCQ XTAL2 VEE XTAL1 S1 VCC S3 S2 1 2 3 4 Top View 5 Gullwing 6 7 8 F1 F2 OE PDR1 FOUT FOUT PDR2 VCCO 16 15 14 13 12 11 10 9 Function I/O XTAL1 Crystal Input 1 (PECL) I/O XTAL2 Crystal Input 2 (PECL) I/O F1 Filter Pin 1 — F2 Filter Pin 2 (Reference) — VCCQ Positive Power Supply (Charge Pump) — S1 Select Input 1 (TTL) I S2 Select Input 2 (TTL) I S3 Select Input 3 (TTL) I FOUT Output (PECL) O FOUT Complement Output (PECL) O VCC Positive Power Supply (Logic) — VCCO Positive Power Supply (PECL Outputs) — OE Output Enable VEE Negative Power Suppy (0.0V) (TTL) — I PDR1 Pulldown Resistor (100Ω) — PDR2 Pulldown Resistor (100Ω) — FREQUENCY SELECTION TABLE Input FOSC (1) S1 S2 S3 FOUT, FOUT Frequency Range MHz 0 0 0 24X FOSC 240 – 480 0 0 1 12X FOSC 120 – 240 0 1 0 8X FOSC 80 – 160 0 1 1 6X FOSC 60 – 120 1 0 0 50X FOSC 500 – 1000 1 0 1 25X FOSC 250 – 500 1 1 0 16.67X FOSC 167 – 333 1 1 1 12.5X FOSC 125 – 250 NOTE: 1. FOSC = 10MHz to 25MHz. ABSOLUTE MAXIMUM RATING(1) Symbol Parameter Value Unit –0.5 to +7.0 V VCC Power Supply Voltage VI TTL Input Voltage(2) –0.5 to 6.0 V II TTL Input Current(2) –30 to +5.0 mA IOUT ECL Output Current 50 100 mA Tstore Storage Temperature –65 to +150 °C TA Operating Temperature 0 to +75 °C –Continuous –Surge 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. 2 ClockWorks™ SY89424V Micrel 5V DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 4.75V to 5.25V Symbol Parameter Min. Typ. Max. Unit VCC Power Supply Voltage 4.75 — 5.25 V ICC Power Supply Current (VCC) — — 80 mA ICCQ Power Supply Current (VCCQ) — — 10 mA ICCO Power Supply Current (VCCO) — — 20 mA Min. Typ. Max. Unit Condition VCC = VCCQ = VCCO PECL outputs FOUT & FOUT are open 3.3V DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V Symbol Parameter VCC Power Supply Voltage 3.0 — 3.8 V ICC Power Supply Current (VCC) — — 68 mA ICCQ Power Supply Current (VCCQ) — — 9 mA ICCO Power Supply Current (VCCO) — — 18 mA Condition VCC = VCCQ = VCCO PECL outputs FOUT & FOUT are open PECL DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V Symbol Parameter Min. Typ. Max. Unit VO Output Voltage Swing 0.55 0.85 1.15 V Peak-to-Peak VOH Output HIGH Voltage VCC – 1.075 — VCC – 0.800 V FOUT & FOUT loaded with 50Ω to VCC – 2.0V VOL Output LOW Voltage VCC – 1.860 — VCC – 1.570 V FOUT & FOUT loaded with 50Ω to VCC – 2.0V (1) VCC – 1.165 — VCC – 0.880 V VCC – 1.810 — VCC – 1.475 V VIH VIL Input HIGH Voltage (1) Input LOW Voltage Condition NOTE: 1. Forcing voltage at XTAL1 and XTAL2 TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V 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 — — –0.2 mA VIN = 0.5V VIK Input Clamp Voltage — — –1.2 V 3 IIN = –18mA ClockWorks™ SY89424V Micrel AC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V Symbol Parameter Min. Typ. Max. Unit Condition — — 10 ps RMS tJIT Jitter PPW Duty Cycle 45% 50% 55% tr tf Output Rise/Fall Time (20% to 80%) 100 100 300 300 500 500 <500MHz ps — APPLICATION AC Coupled Load VTERM = 2.5V CB2 RR RS ZO + – Clock Interface VEE To clock inputs RC On chip pulldown resistor provides 25mA (40mA at 5V VCC) of driver current. VEE = GND PRODUCT ORDERING CODE Odering Code Package Type Operating Range SY89424VZC Z16-1 Commercial SY89424VZCTR Z16-1 Commercial 4 CB2 = 10nF ±20% RS = 6.8 Ohm ±5% RC = 20 Ohm ±1% RR = 5 KOhm ±5% ZO = 20 Ohm ±2 Ohm ClockWorks™ SY89424V Micrel 16 LEAD SOIC .300" WIDE (Z16-1) Rev. 03 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 5