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MAX7376CRRH Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX7376CRRH Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page Silicon Oscillator with Reset Output _______________________________________________________________________________________ 5 Detailed Description The MAX7376 is a clock generator with integrated reset for µCs 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 stan- dard frequencies are available (Table 2). No external components are required for setting or adjusting the frequency. 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 sec- tion 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 500Ω or a posi- tive-supply-connected 250Ω 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 µC Clock Input The MAX7376 clock output is a push-pull, CMOS, logic output that directly drives any µP or µC clock input. There are no impedance-matching issues when using the MAX7376. The MAX7376 is not sensitive to its posi- tion on the board and it does not need to be placed right next to the µP. Refer to the µC 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. 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 out- put. The RST output is asserted when the monitored input (VCC) drops below the internal VTH- threshold and remains asserted for 100µs after the monitored input exceeds the internal VTH+ threshold. The open-drain RST output requires an external pullup resistor. 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. Pin Description PIN NAME FUNCTION 1 CLOCK Push-Pull Clock Output 2 GND Ground 3 RST Reset Output. See the RST Reset Output Options section for more details. 4VCC Positive Supply Voltage. Bypass VCC to GND with a 0.1µF capacitor. 5 E.C. Must Be Externally Connected to VCC LOGIC 600kHz TO 10MHz POR MUX RST/RST CLOCK BIAS_V VCC MAX7376 Figure 1. Functional Diagram |
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