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19-3491; Rev 0; 1/05
Silicon Oscillator with Reset Output
General Description
The MAX7382 silicon oscillator replaces ceramic resonators, crystals, and crystal-oscillator modules as the clock source for microcontrollers in 3V, 3.3V, and 5V applications. The MAX7382 features a factory-programmed oscillator and a microprocessor (P) poweron-reset (POR) supervisor. Unlike typical crystal and ceramic-resonator oscillator circuits, the MAX7382 is resistant to vibration and EMI. The high-output-drive current and absence of highimpedance nodes makes the oscillator less susceptible to dirty or humid operating conditions. With a wide operating temperature range as standard, the MAX7382 is a good choice for demanding home appliance and automotive environments. The MAX7382 is available with factory-programmed frequencies ranging from 10MHz to 32MHz. See Table 2 for standard frequencies and contact the factory for custom frequencies. Refer to the MAX7376 data sheet for frequencies less than 10MHz. The MAX7382 is available in a 5-pin SOT23 package. The MAX7382 standard operating temperature range is -40C to +125C. See the Applications Information section for extended operating temperature range. 2.7V to 5.5V Operation 10MHz to 32MHz Oscillator Integrated POR 10mA Clock Output Drive Capability 2.5% Initial Accuracy 50ppm/C Frequency Drift 50% Duty Cycle 5ns Output Rise and Fall Time Low Jitter: 80psP-P at 16MHz 4mA Operating Current at 16MHz -40C to +125C Temperature Range Small 5-Pin SOT23 Package
Features
MAX7382
Ordering Information
PART* TEMP RANGE PINPACKAGE RESET OUTPUT
Active-high MAX7382A_ _ _-T -40C to +125C 5 SOT23-5 push-pull Active-low MAX7382B_ _ _-T -40C to +125C 5 SOT23-5 push-pull MAX7382C_ _ _-T -40C to +125C 5 SOT23-5 Open drain
Applications
White Goods Automotive Consumer Products Appliances and Controls Handheld Products Portable Equipment Microcontroller Systems
*Standard version is shown in bold. The first letter after the part number designates the reset output option. Insert the letter corresponding to the desired reset threshold level from Table 1 in the next position. Insert the two-letter code from Table 2 in the remaining two positions for the desired frequency range. Table 1 and Table 2 are located at the end of the data sheet.
Typical Operating Circuit
VCC 2.7V TO 5.5V
0.1F
VCC CLOCK
OSC1
OSC2 MAX7382 E.C. RST/RST RST C
GND
Pin Configuration appears at end of data sheet. ________________________________________________________________ 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.
Silicon Oscillator with Reset Output MAX7382
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +6.0V All Other Pins to GND...................................-0.3V to (V+ + 0.3V) CLOCK, RST Current .......................................................50mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C) ....571mW (U5-2) 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
(Typical Operating Circuit, VCC = 2.7V to 5.5V, VL = VCC, TA = -40C to +125C. Typical values are at VCC = 5.0V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Operating Supply Voltage SYMBOL VCC fCLOCK = 16MHz, TA = -40C to +125C, no load fCLOCK = 14.7456MHz, TA = -40C to +125C, no load Operating Supply Current ICC fCLOCK = 12MHz, TA = -40C to +125C, no load fCLOCK = 11.0592MHz, TA = -40C to +125C, no load fCLOCK = 10MHz, TA = -40C to +125C, no load CLOCK OUTPUT Output High Voltage Output Low Voltage VOH VOL VL = 4.5V, ISOURCE = 7.0mA VL = 2.7V, ISOURCE = 2.0mA VL = 4.5V, ISINK = 20mA VL = 2.7V, ISINK = 10mA VCC = 5V, TA = +25C, deviation from selected frequency Clock Frequency Accuracy fCLOCK VCC = 2.7V to 5.5V, TA = +25C, deviation from selected frequency TA = -40C to +125C (Note 2) 40 -2.5 -5.0 50 50 VL - 0.4 0.4 +2.5 % +3.5 350 60 ppm/C % V V CONDITIONS MIN 2.7 TYP MAX 5.5 8.7 8.0 6.5 6.0 5.4 mA UNITS V
Clock Temperature Coefficient Duty Cycle
2
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Silicon Oscillator with Reset Output
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, VCC = 2.7V to 5.5V, VL = VCC, TA = -40C to +125C. Typical values are at VCC = 5.0V, TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Output Jitter Output Rise Time Output Fall Time Power-On-Reset Threshold tR tF VTH SYMBOL CONDITIONS Observation of 16MHz for 20s using a 12GHz oscilloscope 10% to 90% 90% to 10% VCC rising, deviation from nominal threshold TA = +25C TA = -40C to +125C -2 -5 1 122 VCC 0.4 V VL = 2.7V, ISOURCE = 2.0mA Output Low Voltage VOL VL = 4.5V, ISINK = 20mA VL = 2.7V, ISOURCE = 10mA VCC 0.4 0.4 0.4 V MIN TYP 80 5 5 +2 +5 % MAX UNITS psP-P ns ns
MAX7382
Reset Hysteresis Power-On-Reset Delay RESET OUTPUT Output High Voltage (Note 3)
HYST PORDLY
Difference between rising and falling thresholds VCC rising from 0 to 5V in 1s at +25C
% s
VL = 4.5V, ISOURCE = 7.0mA VOH
Note 1: All parameters tested at TA = +25C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design. Not production tested. Note 3: For push-pull output only.
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3
Silicon Oscillator with Reset Output MAX7382
Typical Operating Characteristics
(VCC = VL = 5V, TA = +25C, frequency = 10MHz, unless otherwise noted.)
DUTY CYCLE vs. TEMPERATURE
MAX7382 toc01
DUTY CYCLE vs. SUPPLY VOLTAGE
MAX7382 toc02
SUPPLY CURRENT vs. TEMPERATURE
MAX7382 toc03
50.5
51 FREQUENCY = 11.0592MHz 50 DUTY CYCLE (%) 49 48 47 46 45
3.25 3.20 SUPPLY CURRENT (mA) 3.15 3.10 FREQUENCY = 10MHz 3.05 3.00 2.95 2.90
50.0 DUTY CYCLE (%)
49.5
FREQUENCY = 10MHz
49.0
48.5
48.0 -55 -17 21 59 97 135 TEMPERATURE (C)
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
-55
-17
21
59
97
135
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7382 toc04
FREQUENCY DEVIATION vs. SUPPLY VOLTAGE
FREQUENCY = 11.0592MHz 1.5 FREQUENCY DEVIATION (%) 1.0 0.5 0 -0.5 -1.0 -1.5
MAX7382 toc05
FREQUENCY DEVIATION vs. TEMPERATURE
FREQUENCY = 10MHz 3 FREQUENCY DEVIATION (%) 2 1 0 -1 -2 -3 -4
MAX7382 toc06
4.0 FREQUENCY = 11.0592MHz 3.5 SUPPLY CURRENT (mA)
2.0
4
3.0
2.5
2.0
1.5 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 SUPPLY VOLTAGE (V)
-2.0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 SUPPLY VOLTAGE (V)
-55
-17
21
59
97
135
TEMPERATURE (C)
SETTLING TIME FROM START
MAX7382 toc07
CLOCK OUTPUT WAVEFORM (CL = 10pF)
CLOCK OUTPUT WAVEFORM (CL = 10pF)
MAX7382 toc08
MAX7382 toc09
CH1 FREQ 9.992MHz LOW RESOLUTION
10s/div CHANNEL 1 = CLOCK, CHANNEL 2 = VCC
20ns/div
20ns/div
4
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Silicon Oscillator with Reset Output
Typical Operating Characteristics (continued)
(VCC = VL = 5V, TA = +25C, frequency = 10MHz, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM (CL = 100pF) MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX7382 toc11
MAX7382
MAX7382 toc10
SUPPLY CURRENT vs. FREQUENCY
MAX7382 toc12
1 MAXIMUM TRANSIENT DURATION (s) 0.1 0.01 1m 10m 100m 1 0.04 VRESET = 4.32V
5
SUPPLY CURRENT (mA) 0.24
4
3
2
20ns/div
1 0.09 0.14 0.19 10 11 12 13 14 15 16 RESET THRESHOLD OVERDRIVE (V) FREQUENCY (MHz)
Pin Description
PIN 1 2 3 4 5 NAME CLOCK GND RST VCC E.C. Push-Pull Clock Output Ground Reset Output. Open-drain or push-pull output. See the Ordering Information. Positive Supply Voltage. Bypass with a 0.1F capacitor to GND. Externally Connected. Connect to Vcc. FUNCTION
Detailed Description
The MAX7382 is a clock generator with integrated reset for microcontrollers (Cs) and UARTs in 3V, 3.3V, and 5V applications. The MAX7382 is a replacement for crystal-oscillator modules, crystals, or ceramic resonators, and a system reset IC. The clock frequency and reset threshold voltage are factory trimmed to specific values. A variety of popular standard frequencies are available; see Table 2. No external components are required for setting or adjusting the frequency.
Oscillator
The push-pull clock output drives a load to within 400mV 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 changing of the frequency. A typical oscillating startup is shown in the Typical Operating Characteristics.
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5
Silicon Oscillator with Reset Output MAX7382
Applications Information
Interfacing to a Microcontroller Clock Input
The MAX7382 clock output is a push-pull, CMOS, logic output that directly drives a P or C clock input. There are no impedance-matching issues when using the MAX7382. Refer to the microcontroller data sheet for clock input compatibility with external clock signals. The MAX7382 requires no biasing components or load capacitance. When using the MAX7382 to retrofit a crystal oscillator, remove all biasing components from the oscillator input.
Table 1. Standard Reset Threshold Levels
SUFFIX RESET THRESHOLD (V) X 2.50 V 2.71 R 2.89 standard value Q 3.13 P 3.34 N 3.44 J 3.96 M 4.38 standard value Contact factory for nonstandard reset threshold options.
Reset Output
The MAX7382 is available with three reset output stage options: push-pull active-low, push-pull active-high, and open-drain active-low. RST is asserted when the monitored input (VCC) drops below the internal VTH- threshold and remains asserted for 120s after the monitored input exceeds the internal VTH+ threshold. The open-drain RST output requires an external pullup resistor.
Table 2. Standard Frequencies
SUFFIX UK UT VB VT WB YN STANDARD FREQUENCY (MHz) 10 11.0592 12 14.7456 16 32
Output Jitter
The MAX7382's jitter performance is given in the Electrical Characteristics table as a peak-to-peak value obtained by observing the output of the MAX7382 for 20s with a 12GHz oscilloscope. Jitter measurements are approximately proportional to the period of the output of the device. Thus, a 10MHz device has approximately twice the jitter value of a 20MHz device. The jitter performance of all clock sources degrades in the presence of mechanical and electrical interference.
For all other frequency options, contact factory.
Table 3. Standard Part Numbers
PART MAX7382CRUK MAX7382CRUT* MAX7382CRVB MAX7382CRVT* MAX7382CRWB MAX7382CRYN* MAX7382CMUK* MAX7382CMUT* MAX7382CMVB MAX7382CMVT* MAX7382CMWB MAX7382CMYN* RESET THRESHOLD (V) 2.89 2.89 2.89 2.89 2.89 2.89 4.38 4.38 4.38 4.38 4.38 4.38 FREQUENCY (MHz) 10 11.0592 12 14.7456 16 32 10 11.0592 12 14.7456 16 32 TOP MARK AEVU -- AEVM -- AEVK AEVL -- -- AEVJ -- AEVH AEVI
VCC 2.7V TO 5.5V
MAX7382
POR
RST
OSCILLATOR
CLOCK
*Contact factory for availability.
GND
The MAX7382 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.
Figure 1. Functional Diagram 6 _______________________________________________________________________________________
Silicon Oscillator with Reset Output
Initial Power-Up and Operation
An internal power-up reset holds the clock output low until the supply voltage has risen above the power-onreset threshold (VTH+). RST holds the microcontroller in a reset condition until 120s after the clock has started up. This reset delay ensures that the clock output and the microcontroller's internal clock circuits have stabilized before the system is allowed to start. Typical microcontroller reset delay ranges from 1ms to 250ms to allow a slow crystal oscillator circuit to start up. The MAX7382 has a fast startup, eliminating the need for such a long reset delay.
TOP VIEW
CLOCK 1 5 E.C.
Pin Configuration
MAX7382
GND 2
MAX7382
RST 3
4
VCC
Extended Temperature Operation
The MAX7382 was tested to +135C during product characterization and shown to function normally at this temperature (see the 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.
SOT23
Chip Information
TRANSISTOR COUNT: 2937 PROCESS: BiCMOS
Power-Supply Considerations
The MAX7382 operates with a 2.7V and 5.5V powersupply voltage. Good power-supply decoupling is needed to maintain the power-supply rejection performance of the MAX7382. Bypass VCC to GND with a 0.1F surface-mount ceramic capacitor. Mount the bypassing capacitor as close to the device as possible. If possible, mount the MAX7382 close to the microcontroller's decoupling capacitor so that additional decoupling is not required. Use a larger value of bypass capacitor recommended if the MAX7382 is to operate with a large capacitive load. Use a bypass capacitor value of at least 1000 times that of the output load capacitance.
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7
Silicon Oscillator with Reset Output
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.)
MAX7382
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
SOT-23 5L .EPS

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