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| 5V/3.3V FREQUENCY SYNTHESIZER (60MHz to 1GHz) FEATURES s 3.3V and 5V power supply options s Up to 1GHz clock frequencies s Internal quartz reference oscillator driven by quartz crystal or PECL source s Low jitter PLL design s On-chip 20 ohm driver s Differential outputs with 600mV (min) swing s Optional pull-down resistors for AC-coupled outputs s Low power consumption s External loop filter optimizes performance/cost s Available in 16-pin SOIC package ClockWorksTM SY89424V DESCRIPTION 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 PDR2 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 XTAL1 OSC XTAL2 PHASE COMP CHARGE PUMP LOOP FILTER / 24, / 50 VCO S1A / 1, 2, 3, 4 FOUT FOUT PDR1 PDR2 S2A S3A OE Rev.: G Amendment: /0 1 Issue Date: May, 1998 Micrel ClockWorksTM SY89424V PIN CONFIGURATION PIN NAMES Pin XTAL1 Function Crystal Input 1 Crystal Input 2 Filter Pin 1 Filter Pin 2 (Reference) Positive Power Supply (Charge Pump) Select Input 1 Select Input 2 Select Input 3 Output (TTL) (TTL) (TTL) (PECL) (PECL) (PECL) I/O I/O I/O -- -- -- I I I O O -- -- I -- -- -- VCCQ XTAL2 VEE XTAL1 S1 VCC S3 S2 1 2 3 4 Top View 5 Gullwing 6 7 8 16 15 14 13 12 11 10 9 F1 F2 OE PDR1 FOUT FOUT PDR2 VCCO XTAL2 F1 F2 VCCQ S1 S2 S3 FOUT FOUT VCC VCCO OE VEE PDR1 PDR2 Complement Output (PECL) Positive Power Supply (Logic) Positive Power Supply (PECL Outputs) Output Enable Pulldown Resistor Pulldown Resistor (TTL) (100) (100) Negative Power Suppy (0.0V) FREQUENCY SELECTION TABLE Input FOSC (1) S1 0 0 0 0 1 1 1 1 S2 0 0 1 1 0 0 1 1 S3 0 1 0 1 0 1 0 1 FOUT, FOUT 24X FOSC 12X FOSC 8X FOSC 6X FOSC 50X FOSC 25X FOSC 16.67X FOSC 12.5X FOSC Frequency Range MHz 240 - 480 120 - 240 80 - 160 60 - 120 500 - 1000 250 - 500 167 - 333 125 - 250 NOTE: 1. FOSC = 10MHz to 25MHz. ABSOLUTE MAXIMUM RATING(1) Symbol VCC VI II IOUT Tstore TA TTL Input Voltage(2) TTL Input Current(2) ECL Output Current Storage Temperature Operating Temperature -Continuous -Surge Parameter Power Supply Voltage Value -0.5 to +7.0 -0.5 to 6.0 -30 to +5.0 50 100 -65 to +150 0 to +75 Unit V V mA mA 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. 2 Micrel ClockWorksTM SY89424V 5V DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 4.75V to 5.25V Symbol VCC ICC ICCQ ICCO Parameter Power Supply Voltage Power Supply Current (VCC) Power Supply Current (VCCQ) Power Supply Current (VCCO) Min. 4.75 -- -- -- Typ. -- -- -- -- Max. 5.25 80 10 20 Unit V mA mA mA PECL outputs FOUT & FOUT are open Condition VCC = VCCQ = VCCO 3.3V DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V Symbol VCC ICC ICCQ ICCO Parameter Power Supply Voltage Power Supply Current (VCC) Power Supply Current (VCCQ) Power Supply Current (VCCO) Min. 3.0 -- -- -- Typ. -- -- -- -- Max. 3.8 68 9 18 Unit V mA mA mA PECL outputs FOUT & FOUT are open Condition VCC = VCCQ = VCCO PECL DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V Symbol VO VOH VOL VIH VIL Parameter Output Voltage Swing Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage (1) Min. 0.55 VCC - 1.075 VCC - 1.860 VCC - 1.165 VCC - 1.810 Typ. 0.85 -- -- -- -- Max. 1.15 VCC - 0.800 VCC - 1.570 VCC - 0.880 VCC - 1.475 Unit V V V V V Peak-to-Peak Condition FOUT & FOUT loaded with 50 to VCC - 2.0V FOUT & FOUT loaded with 50 to VCC - 2.0V (1) NOTE: 1. Forcing voltage at XTAL1 and XTAL2 TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V 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 -0.2 -1.2 Unit V V A mA V VIN = 2.7V VIN = VCC VIN = 0.5V IIN = -18mA Condition 3 Micrel ClockWorksTM SY89424V AC ELECTRICAL CHARACTERISTICS VCC = VCCQ = VCCO = 3.0V to 5.25V Symbol Parameter Jitter Duty Cycle Output Rise/Fall Time (20% to 80%) Min. -- 45% 100 100 Typ. -- 50% 300 300 Max. 10 55% 500 500 ps Unit ps Condition RMS <500MHz -- tJIT PPW tr tf APPLICATION AC Coupled Load VTERM = 2.5V CB2 + - VEE RS ZO Clock Interface On chip pulldown resistor provides 25mA (40mA at 5V VCC) of driver current. CB2 RS RC RR ZO = = = = = 10nF 6.8 Ohm 20 Ohm 5 KOhm 20 Ohm 20% 5% 1% 5% 2 Ohm RR To clock inputs RC VEE = GND PRODUCT ORDERING CODE Odering Code SY89424VZC SY89424VZCTR Package Type Z16-1 Z16-1 Operating Range Commercial Commercial 4 Micrel ClockWorksTM SY89424V 16 LEAD SOIC .300" WIDE (Z16-1) Rev. 03 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 5 |
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