DS1090U-2+T

DS1090 Low-Frequency, Spread-Spectrum EconOscillator General Description The DS1090 is a low-cost, dithered oscillator intended to be used as an external clock for switched-mode power supplies and other low-frequency applications. The dithering or sweeping function reduces peak-radiated emissions from the power supply at its fundamental frequency, as well as harmonic frequencies. The device consists of a resistor-programmed master oscillator, factory-programmed clock prescaler, and a pin-programmed dither circuit. These features allow the DS1090 to be used in applications where a spread-spectrum clock is desired to reduce radiated emissions. A combination of factory-set prescalers and external resistor allows for output frequencies ranging from 125kHz to 8MHz. Both dither frequency and dither percentage are set using control pins. Features ●● Low-Cost, Spread-Spectrum EconOscillator™ ●● Simple User Programming ●● O utput Frequency Programmable from 125kHz to 8MHz ●● Dither Percentage Programmable from 0% to 8% ●● D ither Rate Programmable (fMOSC/512, 1024, 2048, or 4096) ●● 3.0V to 5.5V Single-Supply Operation ●● CMOS/TTL-Compatible Output ●● Operating Temperature Range: -40°C to +85°C Ordering Information OUTPUT FREQUENCY RANGE PRESCALER PINPACKAGE DS1090U-1+ 4MHz to 8MHz 1 8 µSOP DS1090U-2+ 2MHz to 4MHz 2 8 µSOP DS1090U-4+ 1MHz to 2MHz 4 8 µSOP DS1090U-8+ 500kHz to 1MHz 8 8 µSOP DS1090U-16+ 250kHz to 500kHz 16 8 µSOP DS1090U-32+ 125kHz to 250kHz 32 8 µSOP PART Applications ●● ●● ●● ●● ●● Switched-Mode Power Supplies Servers Printers Embedded Microcontrollers Industrial Controls Typical Operating Circuit VOUT VIN Pin Configuration VCC VCC DC-DC STEP-DOWN CONVERTER JC0 45kΩ TO 91kΩ J0 GND TOP VIEW OUT DS1090 JC1 RSET Add “T” for Tape & Reel orders. J1 OUT 1 RSET 2 8 7 JC0 3 6 J1 GND 4 5 J0 VCC DS1090 µSOP EconOscillator is a trademark of Maxim Integrated Products, Inc. 19-7500; Rev 3; 9/16 JC1 DS1090 Low-Frequency, Spread-Spectrum EconOscillator Absolute Maximum Ratings Voltage Range on VCC Relative to Ground..........-0.5V to +6.0V Voltage Range on Input Pins Relative to Ground............................... -0.5V to (VCC + 0.5V), not to exceed 6.0V Operating Temperature Range............................ -40°C to +85°C Storage Temperature Range............................. -55°C to +125°C Soldering Temperature.......................................See IPC/JEDEC J-STD-020A Specification Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended DC Operating Conditions (TA = -40°C to +85°C) PARAMETER SYMBOL MAX UNITS 3.0 5.5 V VIH 0.7 x VCC VCC + 0.3 V VIL -0.3 +0.3 x VCC V TYP 1.4 MAX UNITS 1.7 3 Supply Voltage VCC Input Logic 1 (J0, J1, JC0, JC1) Input Logic 0 (J0, J1, JC0, JC1) CONDITIONS (Note 1) MIN TYP DC Electrical Characteristics (VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER SYMBOL Supply Current ICC High-Level Output Voltage (OUT) VOH Low-Level Output Voltage (OUT) VOL CONDITIONS CL = 15pF, VCC = 3.3V, RSET = 40kΩ CL = 15pF, VCC = 5.5V, RSET = 40kΩ IOH = -4mA VCC = min V +1.0 µA VIH = VCC Low-Level Input Current (J0, J1, JC0, JC1) IIL VIL = 0V www.maximintegrated.com V 0.4 IIH IRES 2.4 mA IOL = 4mA High-Level Input Current (J0, J1, JC0, JC1) Resistor Current MIN VCC = max -1.0 µA 150 µA Maxim Integrated │  2 DS1090 Low-Frequency, Spread-Spectrum EconOscillator AC Electrical Characteristics (VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER SYMBOL Internal Master Oscillator Frequency fMOSC Output Frequency Tolerance ∆fOUT Voltage Frequency Variation Temperature Frequency Variation ∆fOUT ∆fOUT Peak-to-Peak Dither (3σ) (Note 5) Power-Up Time Load Capacitance MIN MAX UNITS 4.0 8.0 MHz VCC = 3.3V, TA = +25°C -3.0 +3.0 % TA = +25°C, RSET = 60kΩ, VCC = 3.0V to 3.6V (Notes 2, 3) -0.5 +0.5 TA = +25°C, RSET = 60kΩ, VCC = 4.5V to 5.5V (Notes 2, 3) -1.25 +1.25 VCC = 3.3V (Notes 2, 3, 4) -2.0 +2.0 J0 = GND, J1 = GND 0 J0 = VCC, J1 = GND 2 J0 = VCC, J1 = VCC 8 tPOR + tSTAB (Note 6) CL (Note 7) 4MHz to 8MHz, TA = +25°C (Note 3)