Crystals cut real-time clocks down to size

An Euroquartz product story

Edited by the Electronicstalk editorial team Apr 25, 2005

A new range of ultraminiature crystals provides 32.768kHz output for use in real-time clock applications.

Frequency control specialist, Euroquartz has launched a new range of ultraminiature crystals providing 32.768kHz output for use in real-time clock applications.

The devices are housed in surface mount packages measuring just 3.2 x 1.2 x 0.95mm, making the crystals ideal for use in battery-powered and handheld equipment.

Euroquartz EQ157 series crystals are designed to provide the smallest possible component size for real-time clock applications and also feature low mass rugged construction.

Nominal frequency is 32.7680kHz with calibration tolerance of +/-20ppm at 25C.

Specifications include maximum drive level of 1uW, load capacitance (CL) of 12.5 or 7pF, equivalent series resistance of 65Kohm, temperature coefficient of -0.035/C (parabolic), and shunt capacitance of 1.7pF typical.

Ageing is +/-5ppm maximum in first year at 25C with operating temperature range from -40 to +85C.

Storage temperature range is -55 to +125C.

Suitable for reflow soldering for 10s maximum at 260C twice or 180s at 230C once, the X cut EQ157 series crystals are supplied packaged in bulk in standard EIA tape and reel.