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| 19-3493; Rev 1; 2/05 Silicon Oscillator with Low-Power Frequency Switching and Reset Output General Description The MAX7384 dual-speed silicon oscillator replaces ceramic resonators, crystals, and crystal-oscillator modules as the primary and secondary clock source for microcontrollers in 3V, 3.3V, and 5V applications. The MAX7384 features a factory-programmed high-speed oscillator, a 32.768kHz oscillator, a clock-selector input, and a P power-on-reset (POR) supervisor. The clock output can be switched at any time between the highspeed clock and the 32.768kHz clock for low-power operation. Switchover is synchronized internally to provide glitch-free clock switching. Unlike typical crystal and ceramic-resonator oscillator circuits, the MAX7384 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 MAX7384 is a good choice for demanding home appliance, industrial, and automotive environments. The MAX7384 is available with factory-programmed frequencies ranging from 10MHz to 32MHz. See Table 1 for standard frequencies and contact the factory for custom frequencies. Refer to the MAX7378 data sheet for frequencies less than 10MHz. The MAX7384 is available in an 8-pin MAX(R) package. The MAX7384 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 High-Speed Oscillator from 10MHz to 32MHz Low-Speed 32kHz Oscillator Glitch-Free Clock-Speed Switching 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 13A, 32kHz Operating Current -40C to +125C Temperature Range MAX7384 Ordering Information PART* MAX7384A_ _ _ MAX7384B_ _ _ MAX7384C_ _ _ TEMP RANGE PINPACKAGE RESET OUTPUT Active high push-pull Active low push-pull Open drain -40C to +125C 8 MAX -40C to +125C 8 MAX -40C to +125C 8 MAX 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 Application Circuit VCC 2.7V TO 5.5V 0.1F 0.1F VCC VL CLOCK OSC1 OSC2 MAX7384 E.C. RST/RST SPEED GND RST I/O PORT C MAX is a registered trademark of Maxim Integrated Products, Inc. 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 Low-Power Frequency Switching and Reset Output MAX7384 ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +6.0V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) CLOCK, RST Current .......................................................50mA Input Current (SPEED)......................................................50mA Continuous Power Dissipation (TA = +70C) 8-Pin MAX (derate 4.5mW/C above +70C) ...362mW (U8-1) 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 fCLOCK = 12MHz, TA = -40C to +125C, no load Operating Supply Current ICC fCLOCK = 11.0592MHz, TA = -40C to +125C, no load fCLOCK = 10MHz, TA = -40C to +125C, no load fCLOCK = 32.768kHz, TA = -40C to +125C, no load LOGIC INPUTS (SPEED) Input High Voltage Input Low Voltage Input Current 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 fCLOCK VCC = 2.7V to 5.5V, TA = +25C, deviation from selected frequency TA = -40C to +125C -2.5 -5 50 VL - 0.4 0.4 +2.5 % +3.5 350 ppm/C V V VIH VIL IIN VCC = SPEED = 5.5V 0.7 x VCC 0.3 x VCC 2 A V 13 CONDITIONS MIN 2.7 TYP MAX 5.5 8.7 8.0 6.5 6.0 5.4 25 A mA UNITS V Initial Fast Clock Frequency Accuracy Fast Clock Temperature Coefficient 2 _______________________________________________________________________________________ Silicon Oscillator with Low-Power Frequency Switching and 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 Slow Clock Frequency Slow Clock Temperature Coefficient Duty Cycle Output Jitter Output Rise Time Output Fall Time Power-On-Reset Threshold tR tF VTH SYMBOL fCLOCK CONDITIONS VCC = 5V, TA = +25C VCC = 2.7V to 5.5V, TA = +25C TA = -40C to +125C (Note 2) 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 40 MIN 32.268 31.768 TYP 32.768 32.768 50 50 80 5 5 +2 +5 % MAX 33.268 33.768 325 60 UNITS kHz ppm/C % psP-P ns ns MAX7384 Power-On-Reset Hysteresis Power-On-Reset Delay RESET OUTPUT Output High Voltage (Note 3) VHYST 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. _______________________________________________________________________________________ 3 Silicon Oscillator with Low-Power Frequency Switching and Reset Output MAX7384 Typical Operating Characteristics (VCC = VL = 5V, TA = +25C, frequency = 10MHz, unless otherwise noted.) DUTY CYCLE vs. SUPPLY VOLTAGE MAX7384 toc02 MAX7384 toc01 DUTY CYCLE vs. TEMPERATURE 50.5 51 SUPPLY CURRENT vs. TEMPERATURE MAX7384 toc03 3.25 3.20 SUPPLY CURRENT (mA) 3.15 3.10 FREQUENCY = 10MHz 3.05 3.00 2.95 2.90 FREQUENCY = 11.0592MHz 50 DUTY CYCLE (%) 49 48 47 46 45 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 MAX7384 toc04 FREQUENCY DEVIATION vs. SUPPLY VOLTAGE FREQUENCY = 11.0592MHz 1.5 FREQUENCY DEVIATION (%) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 MAX7384 toc05 FREQUENCY DEVIATION vs. TEMPERATURE FREQUENCY = 10MHz 3 FREQUENCY DEVIATION (%) 2 1 0 -1 -2 -3 -4 MAX7384 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) 2.7 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) SETTLING TIME FROM START MAX7384 toc07 CLOCK OUTPUT WAVEFORM (CL = 10pF) MAX7384 toc08 CLOCK OUTPUT WAVEFORM (CL = 50pF) MAX7384 toc09 CH1 FREQ 9.992MHz LOW RESOLUTION 10s/div CHANNEL 1 = CLOCK, CHANNEL 2 = VCC 20ns/div 20ns/div 4 _______________________________________________________________________________________ Silicon Oscillator with Low-Power Frequency Switching and Reset Output MAX7384 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 MAXIMUM TRANSIENT DURATION (s) MAX7384 toc11 HIGH-SPEED TO LOW-SPEED TRANSITION MAX7384 toc12 MAX7384 toc10 1 0.1 0.01 1m 10m 100m 1 0.04 VRESET = 4.32V 20ns/div 0.09 0.14 0.19 0.24 10s/div CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED RESET THRESHOLD OVERDRIVE (V) HIGH-SPEED TO LOW-SPEED TRANSITION MAX7384 toc13 LOW-SPEED TO HIGH-SPEED TRANSITION MAX7384 toc14 LOW-SPEED TO HIGH-SPEED TRANSITION MAX7384 toc15 40ns/div CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED 10s/div CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED 100ns/div CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED SUPPLY CURRENT vs. FREQUENCY MAX7384 toc16 5 SUPPLY CURRENT (mA) 4 3 2 1 10 11 12 13 14 15 16 FREQUENCY (MHz) _______________________________________________________________________________________ 5 Silicon Oscillator with Low-Power Frequency Switching and Reset Output MAX7384 Pin Description PIN 1 2 3 4 5 6 7 8 NAME VCC VL SPEED RST CLOCK GND E.C. N.C. FUNCTION Positive Supply Voltage. Bypass VCC to GND with a 0.1F capacitor. Output Supply Voltage. Bypass VL to GND with a 0.1F capacitor. VL must be connected to VCC. Clock-Speed Select Input. Drive SPEED low to select the 32kHz fixed frequency. Drive SPEED high to select factory-trimmed frequency. Reset Output. Open-drain or push-pull output. See the Ordering Information. Push-Pull Clock Output Ground Externally Connected. Connect to Vcc. No Connection. Not internally connected. Detailed Description The MAX7384 is a dual-speed clock generator with integrated reset for microcontrollers (Cs) and UARTs in 3V, 3.3V, and 5V applications. The MAX7384 is a replacement for crystal-oscillator modules, crystals, or ceramic resonators and a system reset IC. The high-speed clock frequency and reset threshold voltage are factory trimmed to specific values (see Table 1). A variety of popular standard frequencies are available. The lowspeed clock frequency is fixed at 32.768kHz; see Table 2. No external components are required for setting or adjusting the frequency. Clock-Speed Selection Drive SPEED low to select slow clock speed (nominally 32.768kHz) or high to select full clock speed. SPEED can be connected to VCC or to GND to select fast or slow clock speed, or connected to a logic output (such as a P GPIO port) used to change clock speed on the fly. If SPEED is connected to a P GPIO port, connect a pullup or pulldown resistor to set the clock to the preferred speed on power-up. SPEED input bias current is 2A (max), so a resistor value as high as 500k can be used. Applications Information Interfacing to a Microcontroller Clock Input The MAX7384 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 MAX7384. Refer to the microcontroller data sheet for clock input compatibility with external clock signals. The MAX7384 requires no biasing components or load capacitance. When using the MAX7384 to retrofit a crystal oscillator, remove all biasing components from the oscillator input. 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. VCC 2.7V TO 5.5V VL Reset Output MAX7384 32kHz (LF OSCILLATOR) SPEED LOGIC 10MHz TO 32MHz (HF OSCILLATOR) MUX CLOCK POR RST The MAX7384 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. Under a reset condition, the oscillator is turned off. Output Jitter GND Figure 1. Functional Diagram 6 The MAX7384's jitter performance is given in the Electrical Characteristics table as a peak-to-peak value obtained by observing the output of the MAX7384 for _______________________________________________________________________________________ Silicon Oscillator with Low-Power Frequency Switching and Reset Output 20s with a 12GHz oscilloscope. Jitter measurements are approximately proportional to the output period 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. The MAX7384 is relatively immune to vibration, shock, and EMI influences and thus provides a considerably more robust clock source than crystal or ceramic resonatorbased oscillator circuits. MAX7384 Table 1. Standard Reset Threshold Levels SUFFIX X V R Q P N J M RESET THRESHOLD (V) 2.50 2.71 2.89 Standard value 3.13 3.34 3.44 3.96 4.38 Standard value Initial Power-Up and Operation An internal power-up reset asserts RST until the supply voltage has risen above the power-on-reset threshold (VTH+). RST holds the microcontroller in a reset condition until 120s after VCC has risen above VTH+. 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 MAX7384 has a fast startup, eliminating the need for such a long reset delay. Contact factory for nonstandard reset threshold options. Table 2. Standard Frequencies SUFFIX UK UT VB VT WB YN STANDARD FREQUENCY (MHz) 10 11.0592 12 14.7456 16 32 Extended Temperature Operation The MAX7384 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. For all other frequency options, contact factory. Table 3. Standard Part Numbers PART MAX7384CRUK MAX7384CRUT MAX7384CRVB MAX7384CRVT MAX7384CRWB MAX7384CMUK MAX7384CMUT MAX7384CMVB MAX7384CMVT RESET OUTPUT TYPE Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain RESET FREQUENCY THRESHOLD (MHz) (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 10 11.0592 12 14.7456 16 32 10 11.0592 12 14.7456 16 32 Power-Supply Considerations The MAX7384 operates with a 2.7V and 5.5V powersupply voltage. VCC provides power to the the internal circuitry and VL supplies power to the clock and reset outputs. Good power-supply decoupling is needed to maintain the power-supply rejection performance of the MAX7384. Bypass both VCC and V L to GND with a 0.1F surface-mount ceramic capacitor. Mount the bypassing capacitors as close to the device as possible. Use a larger value bypass capacitor if the MAX7384 is to operate with a large capacitive load. Use a bypass capacitor value of at least 1000 times that of the output load capacitance. MAX7384CRYN* Open drain MAX7384CMWB Open drain MAX7384CMYN* Open drain *Contact factory for availability. _______________________________________________________________________________________ 7 Silicon Oscillator with Low-Power Frequency Switching and Reset Output MAX7384 Chip Information TRANSISTOR COUNT: 2937 PROCESS: BiCMOS TOP VIEW VCC 1 VL 2 SPEED 3 8 7 N.C. E.C. GND CLOCK Pin Configuration MAX7384 6 5 RST 4 MAX 8 _______________________________________________________________________________________ Silicon Oscillator with Low-Power Frequency Switching and 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.) 8LUMAXD.EPS MAX7384 8 4X S 8 INCHES DIM A A1 A2 b c D e E H MIN 0.002 0.030 MAX 0.043 0.006 0.037 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 O0.500.1 E H 0.60.1 1 0.60.1 1 D L S BOTTOM VIEW 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC TOP VIEW A2 A1 A e c b L SIDE VIEW FRONT VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. REV. 21-0036 J 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 _____________________ 9 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. |
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