IQXO-691 Clock Oscillators IQD IQXO-691 Clock Oscillators offer a low supply voltage of 0.9 and 1.2V in a hermetically sealed package. These oscillators offer a frequency range of 24MHz - 40MHz and an operating temperature range of -40°C to +85°C. The IQD IQXO-691 series is available in a 3.2mm x 2.5mm or 2.5mm x 2mm SMT case.