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 description the 32.7368khz LFXO oscillator has been designed especially for applications requiring low power consumption, as low as 500na. the oscillator consists of a miniature tuning fork quartz crystal and a cmos/ttl compatible hybrid circuit. each crystal is pre-qualified before assembly by electrical tests and temperature characterization. outline & dimensions specifications are typical at 25c unless otherwise indicated. specifications are liable to change without notice. frequency: 32.768khz supply voltage: 1.8v to +5.0 volts 10% calibration tolerance: 10, 50 or 100ppm frequency stability over operating temperature range 0 ~ +50c: 25ppm -40 ~ +85c: 100ppm -55 ~ +125c: 100ppm ageing: 1ppm year typical 3ppm per year maximum. shock, survival: 5000g, 0.3ms, ? sine vibration survival: 20g, 10~2000hz swept sine frequency change vs. 10% output load change: 1ppm maximum. operating temperature range commercial: -10 to +70c industrial: -40 to +85c military: -55 to +125c typical current consumption vdd = 1.8v: 0.5a vdd = 2.5v: 0.6a vdd = 3.3v: 0.7a vdd = 5.0v: 1.3a output: cmos rise/fall times: 12ns typical, 25ns maximum duty cycle: 45/55% process temperature: 260c, 20 seconds storage temperature: -55 to +125c specification features very low power consumption tight frequency tolerance cmos output optional output eanable/disable with tri-state low emi emission full military testing available output frequency output high z state oscillator oscillates stops current normal very low when pad 1 is allowed to float it is held high (output enabled) by an internal pull-up resistor. enable (pad 1 high) enable/disable options how to order LFXO smd crystal oscillators LFXO tf 4 s t - sm3 - 32.768k 30 / 30 / ? / i blank = standard s = special or custom enable/disable option, t or n terminations blank = sm1 =gold plated sm3 = solder dipped sm5 = solder dipped (sm1 and sm5 are pb free) frequency k = khz calibration tolerance at 25c (in ppm) frequency stability over temp. range (in ppm) temp. range c = -10 ~ +70c i = -40 ~ +85c m = -55 ~ +125c s = customer specified low power coinsumption smd crystal oscillator 32.768khz supply voltage 1 = 1.8v 2 = 2.5v 3 = 3.0v 4 = 3.3v 5 = 5.0v tf = low power there are two enable/disable options available, 'e' and 'n'. the 'e' option stops oscillating when the output is put into the high z state. the 'n' version does not have pad 1 connected internally. the table below describes the 'e' enable/disable option. disable (pad 1 low) LFXO tf oscillators total frequency tolerance (in ppm) temp. range c = -10 ~ +70c i = -40 ~ +85c m = -55 ~ +125c s = customer specified ? / ? / 50 / i or
|
