New four-pin crystal oscillators designed for high reliability applications

Saelig has announced the EQXO-2000BM mil-spec high reliability crystal oscillators. These new four-pin models add to the recently launched range of Euroquartz defence specification crystal oscillators designed for use in applications that require high reliability. The industry-standard ‘eight-pin DIP oscillator' dimensions feature four active pins and a ruggedised three-point crystal mounting system. The new series clock oscillators complement the previous 14-pin DIP models - EQXO-1000BMK and EQXO-3000BMK - which also incorporate a custom-designed quartz crystal and a CMOS/TTL compatible hybrid circuit on a ceramic substrate. Manufactured using the latest production techniques, these oscillators feature tight frequency calibration tolerance and high stability over a wide temperature range. The available frequency range is from 30kHz to 70MHz with a calibration tolerance of ±10 to ±25ppm at 25C and a frequency stability of ±100 or ±50ppm over the full military temperature range (-55C to +125C). Additional specifications include ageing of ±3ppm maximum in the first year, symmetry of 45%/55%, and standard 5VDC supply voltage (other voltages on request). Standard output is CMOS, 50pF/10 TTL loads, with other outputs available to special order. Ideal for upper atmosphere, aerospace, defence and other applications where high-reliability clock oscillators are required, the new crystal oscillators can be screened to MIL-O-55310C, class B if required. Radiation tolerant versions will withstand ionising radiation to resist electrical failures for a total radiation dose of 40krad(SI).