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MAX7384A Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX7384A Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page Detailed Description The MAX7384 is a dual-speed clock generator with inte- grated reset for microcontrollers (µCs) and UARTs in 3V, 3.3V, and 5V applications. The MAX7384 is a replace- ment 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 low- speed clock frequency is fixed at 32.768kHz; 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 start- up is shown in the Typical Operating Characteristics. 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 µP GPIO port) used to change clock speed on the fly. If SPEED is connected to a µP GPIO port, connect a pullup or pulldown resistor to set the clock to the preferred speed on power-up. SPEED input bias current is 2µA (max), so a resistor value as high as 500kΩ 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 µP or µC 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. Reset Output 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 moni- tored input (VCC) drops below the internal VTH- threshold and remains asserted for 120µs after the monitored input exceeds the internal VTH+ threshold. The open-drain RST output requires an external pullup resistor. Output Jitter 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 6 _______________________________________________________________________________________ MAX7384 RST CLOCK 10MHz TO 16MHz (HF OSCILLATOR) POR VCC 2.7V TO 5.5V GND 32kHz (LF OSCILLATOR) VL MUX LOGIC SPEED Figure 1. Functional Diagram Pin Description PIN NAME FUNCTION 1VCC Positive Supply Voltage. Bypass VCC to GND with a 0.1µF capacitor. 2VL Output Supply Voltage. Bypass VL to GND with a 0.1µF capacitor. VL must be connected to VCC. 3 SPEED Clock-Speed Select Input. Drive SPEED low to select the 32kHz fixed frequency. Drive SPEED high to select factory-trimmed frequency. 4 RST Reset Output. Open-drain or push-pull output. See the Ordering Information. 5 CLOCK Push-Pull Clock Output 6 GND Ground 7 E.C. Externally Connected. Connect to Vcc. 8 N.C. No Connection. Not internally connected. |
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