The MAX7381 is a silicon oscillator intended as a low-cost improvement to ceramic resonators, crystals, and crystal oscillator modules as the clock source for microcontrollers and UARTs in 3V, 3.3V, and 5V applications. The MAX7381 is an integrated oscillator, supplied at specific frequencies, just like crystals and resonators, and with a rail-to-rail, 50%, duty-cycle square-wave output. The oscillator frequency is generated directly without the use of a phase-locked loop (PLL). No additional components are required for setting or adjusting the frequency. Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7381 is resistant to vibration and EMI. The high output-drive current and absence of high-impedance nodes make the oscillator invulnerable to dirty or humid operating conditions. With a wide operating temperature range as standard, the oscillator is a good choice for demanding appliance and automotive environments. The MAX7381 is available with frequencies in the 10MHz to 16MHz range. The MAX7381 is offered in a space-saving 3-pin SC70 package. All ICs are guaranteed to operate over the -55°C to +135°C temperature range and specified from the -40°C to +125°C temperature range.
The MAX7381 silicon oscillator provides a factory‑trimmed, low‑cost clock source for microcontrollers and UARTs in 3 V, 3.3 V and 5 V systems. It is supplied at specific frequencies from 10 MHz to 16 MHz, offers a rail‑to‑rail 50 % duty‑cycle square‑wave output, and requires no external components.
Its specifications include a 2.7 V‑5.5 V supply range, +10 mA output‑drive current, 2 % initial accuracy, 100 ppm/°C temperature drift, 5 µs startup time, 40‑60 % duty cycle, 5 ns rise/fall time and 180 ps peak‑to‑peak jitter at 16 MHz. The device is packaged in a 3‑pin SC70‑3 package and is rated for operation from –55 °C to +135 °C (guaranteed –40 °C to +125 °C).
| Output Drive Current | +10 mA |
|---|---|
| Initial Accuracy | 2 % |
| Temperature Drift | +100 ppm/°C |
| Duty Cycle Range | 40 % to 60 % |
| Output Rise/Fall Time | 5 ns |
| Output Jitter (16 MHz) | 180 ps p‑p |
| Operating Temperature Range | –55 °C to +135 °C (guaranteed –40 °C to +125 °C) |
It provides about +10 mA of output drive current.
The jitter is 180 ps peak‑to‑peak at 16 MHz.