4 ecs, inc. international 1105 s. ridgeview, olathe, ks 66062 ? 913-782-7787 ? 800-237-1041 ? fax 913-782-6991 ? www.ecsxtal.com crystals crystals the ECS-31 series features the same characteristics as only tuning fork crystals offer. because of their miniature size they are ideal for portable and communication equipment applications. features ? miniature size ? cost effective ? long term stability ? excellent shock and vibration characteristics ECS-31 series low frequency quartz crystals operating conditions/electrical characteristics parameters 3x8 2x6 1x5 conditions frequency range f o 20khz ~ 40khz 30khz ~ 150khz 200khz khz frequency tolerance ? f/f o 30 ppm 30 ppm 10,000 ppm @ +25?c frequency vs. temp. charac. ? f/f o see drawing -10?c ~ +60?c turnover temperature tm +25?c typ. temperature coefficient ? -0.034 ppm/?c 2 typ. varies depending on frequency operating temp. range t opr -10 ~ +60 ?c storage temp. range t stg -40 ~ +85 ?c equivalent series resistance r 1 30 ~ 50 (max.) 10 (max.) k load capacitance c l 12.5pf typ. (customer specified) pf motional capacitance c 1 1 ~ 4ff typ. ff shunt capacitance c 0 0.8 ~ 1.7pf typ. pf capacitance ratio t 425 ~ 800 typ. drive level dl 1w max. w insulation resistance ir 500 m min. dc 100v15 aging (first year) ? f/f o 5 ppm max. +25?c 3?c 5 ppm max. conditions will vary shock resistance drop test of 3 times on a hard board from 75 cm height or shock test of 3000g x 0.3ms x 1/2 sin wave x 3 directions depending on frequency part numbering guide example manufacturer frequency load capacitance package type* ecs C .400 C 12.5 C 8 ecs C .400 C 12.5 C 13 ecs C 2.0 C 12.5 C 14 3.1 max. ?0.35 1.1 8.2 max. 10 package dimensions (mm) figure 1) ECS-31-8 ?2.1 max ?0.26 0.7 6.2 max. 10 figure 2) ECS-31-13 ?1.5 max ?0.2 0.45 5.1 max. 4.3 figure 3) ECS-31-14 * package type examples (8=3x8, 13=2x6, 14=1x5) parabolic temperature curve -20 -10 -20 -30 -40 -50 -60 -10 0 10 20 30 40 50 60 70 f/f (ppm) t (?c) to determine frequency stability, use parabolic curvature. for example: what is the stability at 45?c? 1) change in t (?c) = 45 -25 = 20?c 2) change in frequency = -0.04 ppm x ( ? t) 2 = -0.04 ppm x (20) 2 = -16.0 ppm
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