Dallas Semiconductor was a Dallas, Texas-based semiconductor company founded in 1984 specializing in analog, digital, and mixed-signal ICs. Its product portfolio included real-time clocks, non-volatile RAM, microcontrollers, temperature sensors, 1-Wire and iButton devices, and silicon oscillators. Maxim Integrated acquired Dallas Semiconductor in 2001 for approximately $2.5 billion in stock. Maxim was subsequently acquired by Analog Devices in 2021.