3 ecs, inc. international 1105 s. ridgeview, olathe, ks 66062 ? 913-782-7787 ? 800-237-1041 ? fax 913-782-6991 ? www.ecsxtal.com crystals crystals 3.1 max. ?0.35 1.1 8.2 max. 10 ecs tuning fork type crystals are used as a clock source in communication equipment, measuring instruments, microprocessors and other time management applications. their low power consumption makes these crystals ideal for portable equipment. features ? cost effective ? tight tolerance ? long term stability ? excellent resistance and environmental characteristics ecs-3x8, 2x6, 1x5 32.768 khz tuning fork crystals operating conditions/electrical characteristics package dimensions (mm) parameters ecs-3x8 ecs-2x6 ECS-1X5 units nominal frequency fo 32.768 32.768 32.768 khz frequency tolerance ? f/fo 20 20 20 ppm load capacitance (typ.) c l 12.5 12.5 8.0 pf drive level (max.) d l 111w resistance at series resonance r 1 35 (max.) 35 (max.) 40 (max.) k q-factor q 90,000 (typ.) 70,000 (typ.) 80,000 (typ.) turnover temperature t m +25 5 +25 5 +25 5 ?c temperature coefficient ? -0.040ppm/?c 2 max. -0.040ppm/?c 2 max. -0.040ppm/?c 2 max. ppm/( ? c?) shunt capacitance c o 1.60 (typ.) 1.35 (typ.) 1.00 (typ.) pf capacitance ratio 460 (typ.) 450 (typ.) 400 (typ.) operating temp. range t opr -10~+60 ?c storage temp. range t stg -40~+85 ?c shock resistance drop test 3 times on hard wooden board from height of 75cm / 5 ppm max. ppm insulation resistance ir 500m min./dc100v m aging (first year) ? f/fo 3 ppm max. @ +25?c 3?c ppm motional capacitance c 1 0.0035 (typ.) 0.0030 (typ.) 0.0025 (typ.) pf part numbering guide example frequency load capacitance package type* ecs C .327 C 12.5 C 8 ecs C .327 C 12.5 C 13 ecs C .327 C 8 C 14 figure 1) ecs-3x8 ?2.1 max ?0.26 0.7 6.2 max. 10 figure 2) ecs-2x6 ?1.5 max ?0.2 0.45 5.1 max. 4.3 figure 3) ECS-1X5 * package type examples (8=3x8, 13=2x6, 14=1x5) note: contact factory for optional load capacitance. rf rd c 2 c 1 electrical characteristics ic: tc 4069p rf: 10m rd: 330k (as required) c 1 = 22pf, c 2 = 22pf v dd = 3.0v recommended oscillation circuit parabolic temperature curve in this circuit, low drive level with a maximum of 1w is recommended. if excessive drive is applied, irregular oscillation or quartz element fractures may occur. -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 .com .com .com 4 .com u datasheet
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