19-3060; Rev 2; 7/04 3-Pin Silicon Oscillator The MAX7375 is a silicon oscillator, intended as a lowcost improvement replacing ceramic resonators, crystals, and crystal oscillator modules used as the clock source for microcontrollers and UARTs in 3V, 3.3V, and 5V applications. The MAX7375 is a fully integrated oscillator, supplied at specific factory-trimmed frequencies with a Rail-toRail® 50% duty cycle square-wave output. The oscillator frequency is generated directly without the use of a phase-locked loop (PLL). No additional components are used to set or adjust the frequency. Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7375 is highly resistant to vibration and EMI. The high output drive current and absence of high-impedance nodes also makes the oscillator less susceptible to dirty or humid operating conditions. With a wide operating temperature range, the oscillator is a good choice for demanding home appliance and automotive environments. Available in 3-pin space-saving SC70 and SOT23 packages, the MAX7375 is offered in standard and nonstandard factory-set frequencies ranging from 600kHz to 9.99MHz. See the MAX7381 data sheet for frequencies ≥10MHz. The MAX7375’s standard operating temperature range is -40°C to +125°C. See the Applications Information section for extended operating temperature range. Applications White Goods Portable Equipment Automotive Microcontroller Systems Appliances and Controls Hand-Held Products Typical Application Circuit 2.7V TO 5.5V V+ CLOCK OSC1 µC Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ 2.7V to 5.5V Operation Factory-Trimmed Oscillator (600kHz to 9.99MHz) No External Components Required ±10mA Output Drive Current 2% Initial Accuracy ±50ppm/°C Temp Drift Fast Startup Time: 5µs 40% to 60% Maximum Duty Cycle 5ns Output Rise and Fall Time-Low EMI Very Low EMI Susceptibility-No High-Impedance Nodes ♦ Very Low Jitter: 160psP-P at 8MHz ♦ Tiny Surface-Mount Package (SC70, SOT23) ♦ -40°C to +125°C Temperature Range Ordering Information PART TEMP RANGE PIN-PACKAGE MAX7375AXR105-T -40°C to +125°C 3 SC70-3 MAX7375AXR185-T -40°C to +125°C 3 SC70-3 MAX7375AXR365-T -40°C to +125°C 3 SC70-3 MAX7375AXR375-T -40°C to +125°C 3 SC70-3 MAX7375AXR405-T -40°C to +125°C 3 SC70-3 MAX7375AXR425-T -40°C to +125°C 3 SC70-3 MAX7375AXR805-T -40°C to +125°C 3 SC70-3 MAX7375AUR105-T -40°C to +125°C 3 SOT23-3 MAX7375AUR185-T -40°C to +125°C 3 SOT23-3 MAX7375AUR365-T -40°C to +125°C 3 SOT23-3 MAX7375AUR375-T -40°C to +125°C 3 SOT23-3 MAX7375AUR405-T -40°C to +125°C 3 SOT23-3 MAX7375AUR425-T -40°C to +125°C 3 SOT23-3 MAX7375AUR805-T -40°C to +125°C 3 SOT23-3 The MAX7375 is available in factory-set frequencies from 600kHz to 9.99MHz. There are seven standard versions (1MHz, 1.84MHz, 3.58MHz, 3.69MHz, 4MHz, 4.19MHz, and 8MHz, as shown in the Selector Guide) with a required 2.5k order increment. Nonstandard frequencies are also available with a required 10k order increment. For nonstandard versions, contact factory for availability and ordering information. All versions available in tape-and-reel only. MAX7375 GND OSC2 Pin Configuration and Selector Guide appear at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd, ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX7375 General Description MAX7375 3-Pin Silicon Oscillator ABSOLUTE MAXIMUM RATINGS V+ to GND ................................................................-0.3V to +6V CLOCK to GND ............................................-0.3V to (V+ + 0.3V) Continuous Power Dissipation (TA = +70°C) 3-Pin SC70 (derate 2.9mW/°C over +70°C) .................235mW 3-Pin SOT23 (derate 4mW/°C over +70°C ...................320mW Operating Temperature Range .........................-55°C to +135°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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. ELECTRICAL CHARACTERISTICS (V+ = 2.7V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 5V, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER Operating Supply Voltage Operating Supply Current SYMBOL I+ Output High Voltage VOH Output Low Voltage VOL Initial CLOCK Frequency Accuracy CONDITIONS V+ fCLOCK CLOCK Frequency Temperature Sensitivity MIN TYP 2.7 MAX UNITS 5.5 V MAX7375A_R105 0.55 1.1 MAX7375A_R185 0.8 1.25 MAX7375A_R405 1.7 4.2 MAX7375A_R805 3.2 6.4 V+ ≥ 2.7V, ISOURCE = 2.5mA V+ - 0.4 V+ ≥ 4.5V, ISOURCE = 9mA V+ - 0.4 V V+ ≥ 2.7, ISINK = 10mA 0.4 V+ ≥ 4.5V, ISINK = 20mA 0.4 V+ = 3.0V, TA = +25°C (Note 2) MAX7375A_R_ _ _ V+ = 2.7V to 5.5V, TA = +25°C (Note 2) MAX7375A_R_ _ _ mA -2 V +2 % -4 (Note 3) 45 +4 ±50 ±325 ppm/°C 52 57 % Duty Cycle (Note 3) Output Jitter Observation for 20s using a 500MHz oscilloscope (MAX7375A_R805) 160 psP-P Output Rise Time tR (Note 3) 5.0 ns Output Fall Time tF (Note 3) 2.5 ns Note 1: All parameters are tested at TA = +25°C. Specifications over temperature are guaranteed by design and characterization. Note 2: Typical frequencies are nominal values. Note 3: Guaranteed by design and characterization. Not production tested. 2 _______________________________________________________________________________________ 3-Pin Silicon Oscillator 53 DUTY CYCLE (%) 52 51 50 49 51 49 48 47 2.5 V+ = 3.3V 2.0 1.5 V+ = 2.7V 0.5 45 45 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 2.7 TEMPERATURE (°C) 3.4 4.1 5.5 4.8 -40 -25 -10 5 20 35 50 65 80 95 110 125 SUPPLY VOLTAGE (V) FREQUENCY vs. SUPPLY VOLTAGE 2.0 1.5 1.015 NORMALIZED FREQUENCY 2.5 1.020 MAX7375 toc05 1.000 NORMALIZED FREQUENCY 3.0 FREQUENCY vs. TEMPERATURE 1.002 MAX7375 toc04 3.5 TEMPERATURE (°C) 0.998 0.996 0.994 0.992 1.0 3.4 4.1 4.8 5.5 3.4 4.1 4.8 5.5 SUPPLY VOLTAGE (V) SUPPLY CURRENT vs. FREQUENCY SETTLING TIME FROM START V+ = 5.5V 1.000 0.995 0.990 -40 -15 10 35 60 85 110 135 TEMPERATURE (°C) CLOCK OUTPUT WAVEFORM WITH CL = 10pF MAX7375 toc08 MAX7375 toc07 3.5 1.005 0.980 2.7 SUPPLY VOLTAGE (V) 4.0 1.010 0.985 0.990 2.7 MAX7375 toc06 SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.0 SUPPLY CURRENT (mA) 3.0 1.0 47 46 SUPPLY CURRENT (mA) V+ = 5V 3.5 SUPPLY CURRENT (mA) 53 SUPPLY CURRENT vs. TEMPERATURE 4.0 MAX7375 toc02 MAX7375 toc01 54 DUTY CYCLE (%) DUTY CYCLE vs. SUPPLY VOLTAGE 55 MAX7375 toc03 DUTY CYCLE vs. TEMPERATURE 55 MAX7375 Typical Operating Characteristics (V+ = 5V, TA = +25°C, CL = 10pF, 8MHz output, unless otherwise noted.) 3.0 MAX7375 toc09 CLOCK 2V/div 2.5 2.0 V+ = 5V V+ = 3.3V CLOCK 1V/div V+ 2V/div 1.5 1.0 V+ = 2.7V 0.5 V+ = 3.3V V+ = 3.3V 0 0.5 2.5 4.5 FREQUENCY (MHz) 6.5 8.5 1µs/div 40ns/div _______________________________________________________________________________________ 3 MAX7375 3-Pin Silicon Oscillator Typical Operating Characteristics (continued) (V+ = 5V, TA = +25°C, CL = 10pF, 8MHz output, unless otherwise noted.) CLOCK OUTPUT WAVEFORM WITH CL = 100pF CLOCK OUTPUT WAVEFORM WITH CL = 50pF MAX7375 toc11 MAX7375 toc10 CLOCK 1V/div CLOCK 1V/div V+ = 3.3V V+ = 3.3V 40ns/div 40ns/div Pin Description PIN NAME SC70 SOT23 1 2 V+ 2 1 CLOCK 3 3 GND FUNCTION Positive Supply Voltage Clock output. Output is push-pull. Ground Detailed Description The MAX7375 is a replacement for ceramic resonators, crystals, and crystal oscillator modules as the clock source for microcontrollers and UARTs in 3V, 3.3V, and 5V applications. The MAX7375 is an integrated oscillator, supplied at specific frequencies just like crystals and resonators. A variety of popular standard frequencies are available. No external components are required for setting or adjusting the frequency. Supply Voltages The MAX7375 has been designed for use in systems with nominal supply voltages of 3V, 3.3V, or 5V and is specified for operation with supply voltages in the 2.7V to 5.5V range. Operation outside this range is not guaranteed. See the Absolute Maximum Ratings table for limit values of power-supply and pin voltages. Oscillator The clock output is a push-pull configuration and is capable of driving a ground-connected 1kΩ load or a 4 positive supply connected 500Ω load to within 300mV of either supply rail. The clock output remains stable over the full operating voltage range and does not generate short output cycles during either power on or power off. A typical startup characteristic is shown in the Typical Operating Characteristics section. Output Jitter The MAX7375’s jitter performance is given in the Electrical Characteristics table as a peak-to-peak value obtained by observing the output of the MAX7375 for 20s with a 500MHz oscilloscope. Jitter measurements are approximately proportional to the period of the output frequency of the device. Thus, a 4MHz part has approximately twice the jitter value of an 8MHz part. The jitter performance of all clock sources degrades in the presence of mechanical and electrical interference. The MAX7375 is relatively immune to vibration, shock, and EMI influences and thus provides a considerably more robust clock source than crystal- or ceramic-resonator-based oscillator circuits. _______________________________________________________________________________________ 3-Pin Silicon Oscillator Interfacing to a Microcontroller Clock Input The MAX7375 clock output is a push-pull, CMOS, logic output, which directly drives any microprocessor (µP) or microcontroller (µC) clock input. There are no impedance-matching issues when using the MAX7375. Operate the MAX7375 and microcontroller (or other clock input device) from the same supply voltage level. Refer to the microcontroller data sheet for clock input compatibility with external clock signals. The MAX7375 requires no biasing components or load capacitance. When using the MAX7375 to retrofit a crystal oscillator, remove all biasing components from the oscillator input. Startup Performance Extended Temperature Operation The MAX7375 was tested to +135°C during product characterization and shown to function normally at this temperature (see Typical Operating Characteristics). However production test and qualification is only performed from -40°C to +125°C at this time. Contact the factory if operation outside this range is required. Power-Supply Considerations The MAX7375 operates with power-supply voltages in the 2.7V to 5.5V range. Good power-supply decoupling is needed to maintain the power-supply rejection performance of the MAX7375. Use a 0.1µF surface-mount ceramic capacitor connected between V+ and GND and mounted as close to the device as possible. If possible, mount the MAX7375 close to the microcontroller’s decoupling capacitor so that additional decoupling is not required. The MAX7375 oscillator output stabilizes within a few cycles of operation after V+ rises to a sufficient voltage to start the oscillator, typically 1.65V at +25°C. Use a reset or similar voltage-detection circuit to disable devices connected to the MAX7375 until 5µs after the voltage on V+ has risen above 2.7V. A larger value of bypass capacitor is recommended if the MAX7375 is to operate with a large capacitive load. Use a bypass capacitor value of at least 1000 times that of the output load capacitance. Selector Guide Pin Configuration PART FREQUENCY (MHz) TOP MARK MAX7375AXR105 1.00 AOV MAX7375AXR185 1.84 AOU MAX7375AXR365 3.58 AOT MAX7375AXR375 3.69 AOS MAX7375AXR405 4.00 AOR MAX7375AXR425 4.19 AOQ MAX7375AXR805 8.00 AOP MAX7375AUR105 1.00 FZPZ MAX7375AUR185 1.84 FZPT MAX7375AUR365 3.58 FZPU MAX7375AUR375 3.69 FZPV MAX7375AUR405 4.00 FZPY MAX7375AUR425 4.19 FZPW MAX7375AUR805 8.00 FZPX TOP VIEW V+ 1 CLOCK MAX7375AXR 3 1 GND CLOCK 2 MAX7375AUR 3 GND V+ 2 SC70 SOT23 Chip Information TRANSISTOR COUNT: 432 PROCESS: BiCMOS _______________________________________________________________________________________ 5 MAX7375 Applications Information Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) SC70, 3L.EPS MAX7375 3-Pin Silicon Oscillator 6 _______________________________________________________________________________________ 3-Pin Silicon Oscillator SOT23 L.EPS PACKAGE OUTLINE, 3L SOT-23 21-0051 F 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX7375 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)