euroquartz limited blacknell lane crewkerne somerset uk ta18 7he tel: +44 (0)1460 230000 fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk euro quartz low power at-cut clock oscillator description XO3225 oscillators utilise at-cut crystals providing much improved, tight frequency stability as opposed to that stabiity provided by 32.768khz oscillators using the more usual x-cut (tuning fork) crystals. the tight control of frequency provided by these oscillators results in a typical variation of 52 seconds for one month of continuous operation as against 260 seconds over the same period for oscillators that use tuning fork crystals.other benefits include low supply current consumption coupled with quick start-up times. at-cut crystal for excellent temperature stability low power consumption: 50a typical at 15pf load wide supply voltage: +1.8 v to 5.0 volts stability 20ppm, 25ppm or 30ppm fast start-up time micro-miniature 3.2mm x 2.5mm package features outline & dimensions frequency: 32.7680khz frequency stability* 20ppm, 25ppm, 30ppm (overall conditions) operating temperature range: -40 to +85c storage temperature range: -55 to +125c input voltage: +1.8 volts to 5.0 volts 5% input current: 80a maximum (50a typical) output symmetry: 45% to 55% at ? vdd level rise/fall times: 6ns maximum (10% to 90%vdd) logic low '0' level (vol): 10% vdd maximum logic high '1' level (voh): 90% vdd minimum output load: cmos 15pf maximum start-up time: 1ms maximum ageing: 3ppm max. at 253c 1st year enable/disable delay time*: 100ns maximum specification note part numbers XO3225 oscillators part numbers are ordered as follows: 32.7680khz XO3225 - 25 - b XO3225 oscillator 32.768khz frequency 32.768khz model number XO3225 stability in ppm 20, 25 or 30ppm supply voltage blank = 5.0 volts a = 3.3 volts b = 2.5 volts c = 1.8 volts stability over temperature (high stability over -40 to +85c for XO3225 at-cut type) input current vs. vdd
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