XT26T Vishay Dale Tuning Fork Crystal FEATURES • Miniature package • Low cost • KHz frequency • Tight tolerance The tuning fork type quartz crystal provides ultimate in size, performance and economic trade-offs. So it is used as a clock source in communication equipment, measuring instrument, microprocessor and other time management applications. STANDARD ELECTRICAL SPECIFICATIONS PARAMETER SYMBOL Frequency Range CONDITION FO UNIT ± 20 ∆F/FO at 25°C ppm Frequency Coefficient K ref to 25°C ppm/(∆°C)2 TOPR Storing Temperature Range - 10 - 20 TSTG °C CO pF Motional Capacitance C1 fF Load Capacitance CL pF Insulation Resistance IR DL Aging (first year) Fa Equivalent Series Resistance(ESR) Rs 100VDC MAX - 0.042 °C Shunt Capacitance Drive Level TYPICAL 32.768 Frequency Tolerance Operating Temperature Range MIN KHz + 60 + 70 0.85 2 2 4 1 12.5 500 MΩ µW at 25°C ± 3°C 1 ppm - 5.0 + 5.0 KΩ 50 PARABOLIC TEMPERATURE CURVE DIMENSIONS in inches [millimeters] TEMPERATURE (°C) 0.008 [0.20] 0.248 [6.3] Max - 20 - 10 0 10 0.083 [2.1] Max 20 30 40 50 60 70 - 10 0.158 [4.0] Min 0.028 [0.7] - 20 - 30 - 40 - 50 - 60 ORDERING INFORMATION ∆F/f(ppm) XT26T 32.768KHz MODEL FREQUENCY/KHz Document Number: 35017 Revision: 28-Mar-03 To determine frequency stability, use parabolic curvature (k). For example: What is stability at 45°C? 1) Change in Temperature (°C) = 45 - 25 = 20°C 2) Change in Frequency = - 0.042ppm*(∆°C) = - 0.042ppm*(20)2 = - 16.8ppm(max) For technical questions contact: [email protected] www.vishay.com 1