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19-3475; Rev 0; 10/04
Silicon Oscillator with Reset Output
General Description
The MAX7376 silicon oscillator with reset, is a replacement for ceramic resonators, crystals, crystal oscillator modules, and discrete reset circuits. The MAX7376 provides the primary clock source and reset function for microcontrollers in 3V, 3.3V, and 5V applications. The MAX7376 features a factory-programmed high-speed oscillator and a microprocessor (P) power-on-reset (POR) supervisor. Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7376 is resistant to vibration and EMI. The high-output-drive current and absence of highimpedance nodes make the oscillator less susceptible to dirty or humid operating conditions. With a wide operating temperature range as standard, the MAX7376 is a good choice for demanding home appliance, industrial, and automotive environments. The MAX7376 is available in factory-programmed frequencies from 32.768kHz to 10MHz. See Table 2 for standard frequencies and contact the factory for custom frequencies. The MAX7376 is available in a 5-pin SOT23 package. Refer to the MAX7382 data sheet for frequencies 10MHz. The MAX7376 standard operating temperature range is -40C to +125C. See the Applications Information section for the extended operating temperature range. 2.7V to 5.5V Operation Accurate Oscillator: 600kHz to 10MHz or 32kHz Reset Output Holds the C in Reset for 100s After Clock Startup 10mA Clock Output Drive Capability 2% Initial Accuracy 50ppm/C Temperature Coefficient 50% Duty Cycle 5ns Output Rise and Fall Time Low Jitter: 160psP-P) at 8MHz (No PLL) 3mA Operating Current (8MHz) 13A Operating Current (32kHz) -40C to +125C Temperature Range
Features
MAX7376
Ordering Information
PART TEMP RANGE PINPACKAGE RESET OUTPUT Open drain Active high push-pull Active low push-pull
MAX7376C_ _ _-T -40C to +125C 5 SOT23-5 MAX7376A_ _ _-T MAX7376B_ _ _-T -40C to +125C 5 SOT23-5 -40C to +125C 5 SOT23-5
Applications
White Goods Automotive Consumer Products Appliances and Controls Handheld Products Portable Equipment Microcontroller (C) 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 twoletter code from Table 2 in the remaining two positions for the desired frequency range. See Table 3 for standard part numbers.
Pin Configuration
TOP VIEW
CLOCK 1 5 E.C.
Typical Application Circuit appears at end of data sheet.
GND 2
MAX7376
RST/RST 3
4
VCC
SOT23
________________________________________________________________ Maxim Integrated Products
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Silicon Oscillator with Reset Output MAX7376
ABSOLUTE MAXIMUM RATINGS
VCC to GND .............................................................-0.3V to +6V All Other Pins to GND ................................-0.3V to (VCC + 0.3V) CLOCK Current ................................................................10mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C) ...................571mW (U5 - 2) Operating Temperature Range .........................-40C to +135C Junction Temperature .....................................................+150C Storage Temperature Range.............................-60C 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
(VCC = 2.7V to 5.5V, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = 5V and TA = +25C.) (Note 1)
PARAMETER Operating Supply Voltage Operating Supply Current CLOCK OUTPUT Minimum Operating Voltage VCC = 4.5V, ISOURCE = 9mA Output High Voltage VOH VCC = 2.7V, ISOURCE = 2.5mA Output Low Voltage Initial Frequency Accuracy Frequency Temperature Sensitivity Initial Frequency Accuracy (32.768kHz) Frequency Temperature Sensitivity CLOCK Output Duty Cycle CLOCK Output Jitter CLOCK Output Rise Time CLOCK Output Fall Time tR tF Observation of 8MHz output for 20s using a 500MHz oscilloscope 10% to 90% 90% to 10% fCLOCK VOL fCLOCK VCC = 4.5V, ISINK = 20mA VCC = 2.7V, ISINK = 10mA VCC = 5V, TA = +25C (Note 2) VCC = 2.7V to 5.5V, TA = +25C (Note 3) VCC = 5V, TA = +25C (Note 2) VCC = 2.7V to 5.5V, TA = +25C 32.768kHz (Note 3) 43 32.440 31.785 50 50 160 5 5 -2 -4 50 32.768 VCC - 0.4 V VCC - 0.4 0.4 0.4 +2 +4 325 33.096 33.751 325 57 V % ppm/oC kHz ppm/oC % psP-P ns ns 1.65 V SYMBOL VCC ICC fCLOCK = 8MHz, no load fCLOCK = 32.768kHz, no load CONDITIONS MIN 2.7 3 13 TYP MAX 5.5 5 25 UNITS V mA A
2
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Silicon Oscillator with Reset Output
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.7V to 5.5V, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = 5V and TA = +25C.) (Note 1)
PARAMETER RST/RST OUTPUT TA = +25C Reset Threshold VTH+ VCC rising TA = -40C to +125C Reset Hysteresis POR Delay Output High Voltage Output Low Voltage Leakage Current VOH VOL ILEAK VTHYS VHYST = {(VTH+) - ( VTH-)}/(VTH-) x 100% VCC rising from 0V to (VTH + 200mV) in 1s VCC = 4.5V, ISOURCE = 9mA VCC = 2.7V, ISOURCE = 2.5mA VCC = 4.5V, ISINK = 20mA VCC = 2.7V, ISINK = 10mA VCC = 5.5V, VRST = 5.5V, open drain VCC - 0.4 VCC - 0.4 0.4 0.4 1 VTH 2% VTH 5% 2.0 100 VTH + 2% V VTH + 5% % s V V A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX7376
Note 1: All parameters are tested at TA = +25C. Specifications over temperature are guaranteed by design. Note 2: The frequency is determined by part number selection. See Table 3. Note 3: Guaranteed by design. Not production tested.
Typical Operating Characteristics
(VCC = 5V, TA = +25C, unless otherwise noted.)
DUTY CYCLE vs. TEMPERATURE
MAX7376 toc01
DUTY CYCLE vs. SUPPLY VOLTAGE
MAX7376 toc02
SUPPLY CURRENT vs. TEMPERATURE
1.4 1.3 SUPPLY CURRENT (mA) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 CLOCK = 4MHz
MAX7376 toc03
55 54 53 DUTY CYCLE (%) 52 51 50 49 48 47 46 45 -55 -30 -5 20 45 70 95 120 TEMPERATURE (C) CLOCK = 4MHz
55 54 53 DUTY CYCLE (%) 52 51 50 49 48 47 46 45 4.3 4.6 4.9 5.2 CLOCK = 4MHz
1.5
5.5
0.5 -55 -30 -5 20 45 70 95 120 TEMPERATURE (C)
SUPPLY VOLTAGE (V)
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Silicon Oscillator with Reset Output MAX7376
Typical Operating Characteristics (continued)
(VCC = 5V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7376 toc04
FREQUENCY vs. SUPPLY VOLTAGE
MAX7376 toc05
FREQUENCY vs. TEMPERATURE
4.08 4.06 FREQUENCY (MHz) 4.04 4.02 4.00 3.98 3.96 3.94 3.92 3.90 CLOCK = 4MHz
MAX7376 toc06
1.5 1.4 1.3 SUPPLY CURRENT (mA) 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 4.3 4.6 4.9 5.2 CLOCK = 4MHz
4.10 4.08 4.06 FREQUENCY (MHz) 4.04 4.02 4.00 3.98 3.96 3.94 3.92 3.90 CLOCK = 4MHz
4.10
5.5
4.3
4.6
4.9
5.2
5.5
-55
-30
-5
20
45
70
95
120
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
CLOCK OUTPUT WAVEFORM (CL = 10pF)
MAX7376 toc07
CLOCK OUTPUT WAVEFORM (CL = 50pF)
MAX7376 toc08
CLOCK OUTPUT WAVEFORM (CL = 100pF)
MAX7376 toc09
CLOCK CLOCK CLOCK
f = 4MHz, CL = 10pF 40ns/div
f = 4MHz, CL = 50pF 40ns/div
f = 4MHz, CL = 100pF 40ns/div
MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD
MAXIMUM TRANSIENT DURATION (s)
MAX7376 toc10
1000
RESET OCCURS ABOVE THE CURVE 100
RESET = 4.29V 10 0 200 400 600 800 1000 RESET THRESHOLD OVERDRIVE (mV)
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Silicon Oscillator with Reset Output
Pin Description
PIN 1 2 3 4 5 NAME CLOCK GND RST VCC E.C. Push-Pull Clock Output Ground Reset Output. See the RST Reset Output Options section for more details. Positive Supply Voltage. Bypass VCC to GND with a 0.1F capacitor. Must Be Externally Connected to VCC FUNCTION
MAX7376
Detailed Description
The MAX7376 is a clock generator with integrated reset for Cs and UARTs in 3V, 3.3V, and 5V applications (Figure 1). The MAX7376 is a replacement for crystal oscillator modules, crystals, or ceramic resonators and a system-reset IC. The clock frequency is factory trimmed to specific values. A variety of popular standard frequencies are available (Table 2). No external components are required for setting or adjusting the frequency.
Oscillator
The clock output is a push-pull configuration and is capable of driving a ground-connected 500 or a positive-supply-connected 250 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 power-off. A typical startup characteristic is shown in the Typical Operating Characteristics.
Applications Information
Interfacing to a C Clock Input
The MAX7376 clock output is a push-pull, CMOS, logic output that directly drives any P or C clock input. There are no impedance-matching issues when using the MAX7376. The MAX7376 is not sensitive to its position on the board and it does not need to be placed right next to the P. Refer to the C data sheet for clock-input compatibility with external clock signals. The MAX7376 requires no biasing components or load capacitance. When using the MAX7376 to retrofit a crystal oscillator, remove all biasing components from the oscillator input.
Supply Voltage
The MAX7376 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. See the Absolute Maximum Ratings section for limit values of power-supply and pin voltages.
VCC
RST Reset Output Options
The MAX7376 is available with three reset output stage options: push-pull with active-low output, push-pull with active-high output, and open drain with active-low output. The RST output is asserted when the monitored input (VCC) drops below the internal VTH- threshold and remains asserted for 100s after the monitored input exceeds the internal VTH+ threshold. The open-drain RST output requires an external pullup resistor.
BIAS_V
LOGIC
POR
RST/RST
MUX
CLOCK
Output Jitter
The MAX7376's jitter performance is given in the Electrical Characteristics table as a peak-to-peak value obtained by observing the output of the MAX7376 for 20s with a 500MHz oscilloscope. Jitter values 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 clock sources degrades in the presence of mechanical and electrical interference.
5
600kHz TO 10MHz MAX7376
Figure 1. Functional Diagram
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Silicon Oscillator with Reset Output MAX7376
The MAX7376 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.
Power-Supply Considerations
The MAX7376 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 MAX7376. Bypass VCC to GND with a 0.1F surface-mount ceramic capacitor. Mount the bypass capacitor as close to the device as possible. If possible, mount the MAX7376 close to the C's decoupling capacitor so that additional decoupling is not required. A larger value bypass capacitor is recommended if the MAX7376 is to operate with a large capacitive load. Use a bypass capacitor value of at least 1000 times that of the output load capacitance.
Initial Power-Up and Operation
The clock starts up within 30s (typ) after VCC has risen above the reset threshold. The reset output remains asserted for 100s after the reset threshold is reached.
Extended Temperature Operation
The MAX7376 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.
Table 1. Standard Reset Threshold Levels
SUFFIX R M RESET THRESHOLD (V) 2.57 4.29
Typical Application Circuit
SUPPLY VOLTAGE
For all other reset threshold options, contact factory.
Table 2. Standard Frequencies
SUFFIX AA MG OK QT QW RD RH TP STANDARD FREQUENCY (MHz) 32.768kHz 1 1.8432 3.39545 3.6864 4 4.1943 8
E.C.
VCC OSC1 CLOCK OSC2
MAX7376
RST/RST
RST
C
For all other reset threshold options, contact factory.
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Silicon Oscillator with Reset Output MAX7376
Table 3. Standard Part Numbers
PART MAX7376CRAA MAX7376CRMG MAX7376CROK MAX7376CRQT MAX7376CRQW MAX7376CRRD MAX7376CRRH MAX7376CRTP MAX7376CMMG MAX7376CMOK MAX7376CMQT MAX7376CMQW MAX7376CMRD MAX7376CMRH MAX7376CMTP PIN-PACKAGE 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 5 SOT23 RESET THRESHOLD (V) 2.57 2.57 2.57 2.57 2.57 2.57 2.57 2.57 4.29 4.29 4.29 4.29 4.29 4.29 4.29 FREQUENCY (Hz) 32.768k 1M 1.8432M 3.39545M 3.6864M 4M 4.1943M 8M 1M 1.8432M 3.39545M 3.6864M 4M 4.1943M 8M TOP MARK AEUZ AEUN AEUJ AETT AETU AETV AETW AESF AEUM AEUI AESH AETP AESJ AETR AETS
Chip Information
TRANSISTOR COUNT: 2027 PROCESS: BiCMOS
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Silicon Oscillator with Reset Output MAX7376
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.)
PACKAGEOUTLINE,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) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOT-23 5L .EPS

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