The recommended power-up sequence is to apply VCC first, followed by a valid clock signal, and then the reset signal (RST) can be released.
To ensure accuracy, use a high-quality crystal oscillator, keep the crystal and oscillator circuitry away from noise sources, and use a decoupling capacitor between VCC and GND.
The maximum frequency deviation is ±100 ppm over the operating temperature range of -40°C to +85°C.
Yes, the DS1338U-33+ can be used as a clock source for a microcontroller. The clock output is a CMOS-compatible signal that can drive a microcontroller's clock input.
The DS1338U-33+ can be reset by asserting the RST pin low for at least 100 ns. This resets the clock output to a stable state.
DS1338U-33+ datasheet
by Maxim Integrated Products
