general description the max7375 is a silicon oscillator, intended as a low-cost improvement replacing ceramic resonators, crystals, and crystal oscillator modules used as the clock source for micro - controllers 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-to-rail 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 tem - perature range, the oscillator is a good choice for demanding home appliance environments. available in 3-pin space-saving sc70 package, 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 max7375s standard operating temperature range is -40c to +125c. see the applications information sec - tion for extended operating temperature range. applications 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: 5s 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: 160ps p-p at 8mhz tiny surface-mount package (sc70) -40c to +125c temperature range 19-3060; rev 4; 4/14 white goods appliances and controls hand-held products portable equipment microcontroller systems note: 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 ver - sions available in tape-and-reel only. part temp range pin-package max7375axr105-t -40c to +125c 3 sc70-3 max7375axr185-t -40c to +125c 3 sc70-3 max7375axr365-t -40c to +125c 3 sc70-3 max7375axr375-t -40c to +125c 3 sc70-3 max7375axr405-t -40c to +125c 3 sc70-3 max7375axr425-t -40c to +125c 3 sc70-3 MAX7375AXR805-t -40c to +125c 3 sc70-3 max7375 osc1osc2 2.7v to 5.5v v+gnd clock c pin configuration and selector guide appear at end of data sheet. max7375 3-pin silicon oscillator typical application circuit ordering information downloaded from: http:///
(v+ = 2.7v to 5.5v, t a = -40c to +125c, unless otherwise noted. typical values are at v+ = 5v, t a = +25c, unless otherwise noted.) (note 1)note 1: all parameters are tested at t a = +25c. 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. parameter symbol conditions min typ max units operating supply voltage v+ 2.7 5.5 v operating supply current i+ max7375a_r105 0.55 1.1 ma max7375a_r185 0.8 1.25 max7375a_r405 1.7 4.2 max7375a_r805 3.2 6.4 output high voltage v oh v+ 2.7v, i source = 2.5ma v+ - 0.4 v v+ 4.5v, i source = 9ma v+ - 0.4 output low voltage v ol v+ 2.7, i sink = 10ma 0.4 v v+ 4.5v, i sink = 20ma 0.4 initial clock frequency accuracy f clock v+ = 3.0v, t a = +25c (note 2) max7375a_r_ _ _ -2 +2 % v+ = 2.7v to 5.5v, t a = +25c (note 2) max7375a_r_ _ _ -4 +4 clock frequency temperature sensitivity (note 3) 50 325 ppm/c duty cycle (note 3) 45 52 57 % output jitter observation for 20s using a 500mhz oscilloscope (max7375a_r805) 160 ps p-p output rise time t r (note 3) 5.0 ns output fall time t f (note 3) 2.5 ns v+ to gnd ............................................................... -0.3v to +6v clock to gnd ........................................... -0.3v to (v+ + 0.3v) continuous power dissipation (t a = +70c) 3-pin sc70 (derate 2.9mw/c over +70c) ................ 235mw operating temperature range ......................... -55c to +135c junction temperature ...................................................... +150c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................. +300c max7375 3-pin silicon oscillator www.maximintegrated.com maxim integrated 2 absolute maximum ratings 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 downloaded from: http:///
(v+ = 5v, t a = +25c, c l = 10pf, 8mhz output, unless otherwise noted.) duty cycle vs. temperature max7375 toc01 temperature (c) duty cycle (%) 110 95 65 80 -10 5 20 35 50 -25 46 47 48 49 50 51 52 53 54 5545 -40 125 supply current vs. supply voltage max7375 toc04 supply voltage (v) supply current (ma) 4.8 4.1 3.4 2.0 2.5 3.0 3.5 4.01.0 1.5 2.7 5.5 supply current vs. frequency max7375 toc07 frequency (mhz) supply current (ma) 6.5 4.5 2.5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 0.5 8.5 v+ = 5.5v v+ = 5v v+ = 3.3v v+ = 2.7v duty cycle vs. supply voltage max7375 toc02 supply voltage (v) duty cycle (%) 4.8 4.1 3.4 47 49 51 53 5545 2.7 5.5 frequency vs. supply voltage max7375 toc05 supply voltage (v) normalized frequency 4.8 4.1 3.4 0.994 0.996 0.998 1.000 1.0020.990 0.992 2.7 5.5 settling time from start max7375 toc08 1s/div v+2v/div clock2v/div v+ = 3.3v supply current vs. temperature max7375 toc03 temperature (c) supply current (ma) 110 95 65 80 -10 5 20 35 50 -25 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 -40 125 v+ = 3.3v v+ = 5v v+ = 2.7v 0.980 0.9900.985 1.0000.995 1.0151.010 1.005 1.020 -40 10 -15 35 60 85 110 135 frequency vs. temperature max7375 toc06 temperature (c) normalized frequency clock output waveform with cl = 10pf max7375 toc09 40ns/div clock1v/div v+ = 3.3v max7375 3-pin silicon oscillator maxim integrated 3 www.maximintegrated.com typical operating characteristics downloaded from: http:///
(v+ = 5v, t a = +25c, c l = 10pf, 8mhz output, unless otherwise noted.) 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 oscilla - tor, 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 speci - fied 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 capa - ble of driving a ground-connected 1k load or a positive supply connected 500 load to within 300mv of either supply rail. the clock output remains stable over the full operating voltage range and does not generate short out - put cycles during either power on or power off. a typical startup characteristic is shown in the typical operating characteristics section. output jitter the max7375s 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 approxi - mately 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. pin name function sc70 1 v+ positive supply voltage 2 clock clock output. output is push-pull. 3 gnd ground clock output waveform with c l = 50pf max7375 toc10 40ns/div clock1v/div v+ = 3.3v clock output waveform with c l = 100pf max7375 toc11 40ns/div clock1v/div v+ = 3.3v max7375 3-pin silicon oscillator maxim integrated 4 www.maximintegrated.com pin description typical operating characteristics (continued) downloaded from: http:///
applications information interfacing to a microcontroller clock input the max7375 clock output is a push-pull, cmos, logic output, which directly drives any microprocessor (p) or microcontroller (c) 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 crys - tal oscillator, remove all biasing components from the oscillator input. startup performance 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 +25c. use a reset or similar voltage-detection circuit to disable devices con - nected to the max7375 until 5s after the voltage on v+ has risen above 2.7v. extended temperature operation the max7375 was tested to +135c during product characterization and shown to function normally at this temperature (see typical operating characteristics ). however, production test and qualification is only per - formed from -40c to +125c 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 per - formance of the max7375. use a 0.1f surface-mount ceramic capacitor connected between v+ and gnd and mounted as close as possible to the device. if possible, mount the max7375 close to the microcontrollers decou - pling capacitor so that additional decoupling is not required. 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. 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 clock 1 3 gnd v+ max7375axr sc70 top view 2 chip information process: bicmos max7375 3-pin silicon oscillator www.maximintegrated.com maxim integrated 5 selector guide pin coniguration downloaded from: http:///
package type package code document no. land pattern no. 3 sc70 x3-2 21-0075 90-0208 max7375 3-pin silicon oscillator www.maximintegrated.com maxim integrated 6 package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. downloaded from: http:///
revision number revision date description pages changed 0 10/03 initial release 1 2 3 12/07 removed all references to max7375aur_ and sot23 package 1, 2, 4, 5 4 4/14 removed automotive reference from general description and applications 1 revision history maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max7375 3-pin silicon oscillator ? 2014 maxim integrated products, inc. 7 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///
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