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19-3060; Rev 2; 7/04
3-Pin Silicon Oscillator
General Description
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(R) 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 -40C to +125C. See the Applications Information section for extended operating temperature range.
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: 160psP-P at 8MHz Tiny Surface-Mount Package (SC70, SOT23) -40C to +125C Temperature Range
MAX7375
Ordering Information
PART MAX7375AXR105-T MAX7375AXR185-T MAX7375AXR365-T MAX7375AXR375-T MAX7375AXR405-T MAX7375AXR425-T MAX7375AXR805-T MAX7375AUR105-T MAX7375AUR185-T MAX7375AUR365-T MAX7375AUR375-T MAX7375AUR405-T MAX7375AUR425-T TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PIN-PACKAGE 3 SC70-3 3 SC70-3 3 SC70-3 3 SC70-3 3 SC70-3 3 SC70-3 3 SC70-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3 3 SOT23-3
Applications
White Goods Automotive Appliances and Controls Hand-Held Products Portable Equipment Microcontroller Systems
Typical Application Circuit
2.7V TO 5.5V OSC1 C
V+
CLOCK
MAX7375AUR805-T
MAX7375
GND
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.
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 1
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.
3-Pin Silicon Oscillator MAX7375
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V CLOCK to GND ............................................-0.3V to (V+ + 0.3V) Continuous Power Dissipation (TA = +70C) 3-Pin SC70 (derate 2.9mW/C over +70C) .................235mW 3-Pin SOT23 (derate 4mW/C over +70C ...................320mW Operating Temperature Range .........................-55C to +135C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = -40C to +125C, unless otherwise noted. Typical values are at V+ = 5V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Operating Supply Voltage SYMBOL V+ MAX7375A_R105 Operating Supply Current I+ MAX7375A_R185 MAX7375A_R405 MAX7375A_R805 Output High Voltage Output Low Voltage VOH VOL V+ 2.7V, ISOURCE = 2.5mA V+ 4.5V, ISOURCE = 9mA V+ 2.7, ISINK = 10mA V+ 4.5V, ISINK = 20mA V+ = 3.0V, TA = +25C (Note 2) V+ = 2.7V to 5.5V, TA = +25C (Note 2) (Note 3) (Note 3) Observation for 20s using a 500MHz oscilloscope (MAX7375A_R805) tR tF (Note 3) (Note 3) 45 MAX7375A_R_ _ _ MAX7375A_R_ _ _ -2 -4 50 52 160 5.0 2.5 V+ - 0.4 V+ - 0.4 0.4 0.4 +2 % +4 325 57 ppm/C % psP-P ns ns CONDITIONS MIN 2.7 0.55 0.8 1.7 3.2 TYP MAX 5.5 1.1 1.25 4.2 6.4 V V mA UNITS V
Initial CLOCK Frequency Accuracy
fCLOCK
CLOCK Frequency Temperature Sensitivity Duty Cycle Output Jitter Output Rise Time Output Fall Time
Note 1: All parameters are tested at TA = +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.
2
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3-Pin Silicon Oscillator MAX7375
Typical Operating Characteristics
(V+ = 5V, TA = +25C, CL = 10pF, 8MHz output, unless otherwise noted.)
DUTY CYCLE vs. TEMPERATURE
MAX7375 toc01
DUTY CYCLE vs. SUPPLY VOLTAGE
MAX7375 toc02
SUPPLY CURRENT vs. TEMPERATURE
3.5 SUPPLY CURRENT (mA) 3.0 2.5 2.0 1.5 1.0 0.5 V+ = 2.7V V+ = 3.3V V+ = 5V
MAX7375 toc03
55 54 53 DUTY CYCLE (%) 52 51 50 49 48 47 46 45
55
4.0
53 DUTY CYCLE (%)
51
49
47
45 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 2.7 3.4 4.1 4.8 5.5 SUPPLY VOLTAGE (V)
0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7375 toc04
FREQUENCY vs. SUPPLY VOLTAGE
MAX7375 toc05
FREQUENCY vs. TEMPERATURE
1.015 NORMALIZED FREQUENCY 1.010 1.005 1.000 0.995 0.990 0.985 0.980
MAX7375 toc06
4.0 3.5 SUPPLY CURRENT (mA) 3.0 2.5 2.0 1.5 1.0 2.7 3.4 4.1 4.8
1.002 1.000 NORMALIZED FREQUENCY 0.998 0.996 0.994 0.992 0.990
1.020
5.5
2.7
3.4
4.1
4.8
5.5
-40
-15
10
35
60
85
110
135
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
SUPPLY CURRENT vs. FREQUENCY
3.5 SUPPLY CURRENT (mA) 3.0 2.5 2.0 V+ = 3.3V 1.5 1.0 0.5 0 0.5 2.5 4.5 FREQUENCY (MHz) 6.5 8.5 V+ = 2.7V V+ = 5V
MAX7375 toc07
SETTLING TIME FROM START
MAX7375 toc08
4.0 V+ = 5.5V
CLOCK OUTPUT WAVEFORM WITH CL = 10pF
MAX7375 toc09
CLOCK 2V/div
V+ 2V/div
CLOCK 1V/div
V+ = 3.3V 1s/div 40ns/div
V+ = 3.3V
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3
3-Pin Silicon Oscillator MAX7375
Typical Operating Characteristics (continued)
(V+ = 5V, TA = +25C, CL = 10pF, 8MHz output, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM WITH CL = 50pF
MAX7375 toc10
CLOCK OUTPUT WAVEFORM WITH CL = 100pF
MAX7375 toc11
CLOCK 1V/div
CLOCK 1V/div
V+ = 3.3V 40ns/div 40ns/div
V+ = 3.3V
Pin Description
PIN SC70 1 2 3 SOT23 2 1 3 NAME V+ CLOCK GND Positive Supply Voltage Clock output. Output is push-pull. Ground FUNCTION
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.
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 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.
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 1k load or a
4
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3-Pin Silicon Oscillator
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 crystal oscillator, remove all biasing components from the oscillator input.
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 performed from -40C to +125C at this time. Contact the factory if operation outside this range is required.
MAX7375
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 0.1F 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. 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.
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 connected to the MAX7375 until 5s after the voltage on V+ has risen above 2.7V.
Selector Guide
PART MAX7375AXR105 MAX7375AXR185 MAX7375AXR365 MAX7375AXR375 MAX7375AXR405 MAX7375AXR425 MAX7375AXR805 MAX7375AUR105 MAX7375AUR185 MAX7375AUR365 MAX7375AUR375 MAX7375AUR405 MAX7375AUR425 MAX7375AUR805 FREQUENCY (MHz) 1.00 1.84 3.58 3.69 4.00 4.19 8.00 1.00 1.84 3.58 3.69 4.00 4.19 8.00 TOP MARK AOV AOU AOT AOS AOR AOQ AOP FZPZ FZPT FZPU FZPV FZPY FZPW FZPX
CLOCK 2 V+ 1
Pin Configuration
TOP VIEW
CLOCK
1
MAX7375AXR
3
GND V+ 2
MAX7375AUR
3
GND
SC70
SOT23
Chip Information
TRANSISTOR COUNT: 432 PROCESS: BiCMOS
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5
3-Pin Silicon Oscillator MAX7375
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
6
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3-Pin Silicon Oscillator
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.)
MAX7375
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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOT23 L.EPS

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