Citizen Crystals and Oscillators - CMR250T Page 1 of 2 CMR250T (2,000pcs/reel) FEATURES: z z z z Because of their excellent shock resistance and low power consumption, the units are ideal for portable equipment. Features superior characteristics indigenous to tuning fork-type quartz crystal units. Ideal for low cost SMD applications. Provided in Tape and Reel. APPLICATIONS: z Permits use as a clock source for communication equipment, AV equipment, OA equipment, measuring instruments and pagers. STANDARD SPECIFICATIONS Item Nominal frequency Frequency tolerance Frequency vs.Temperature Characteristics CM250T f0 delta f/f0 delta f/f0 Conditions 30kHz to165kHz 30ppm At 25C See drawing -10C to +60C Turnover temperature Tm 25C 5C Temperature coefficient beta -0.034 0.006ppm/C2 Operating temperature range Topr -40C to + 85C Storage temperature range Tstg -55C to +125C Equivalent series resistance R1 35k ohm to 50k ohm At 25C Load capacitance 12.5pF TYP. Please specify 0.001 to 0.004pF TYP. Shunt capacitance CL C1 C0 Capacitance ratio gamma 425 to 800 TYP. Drive level DL 1 W MAX. Insulation resistance IR delta f/f0 500M ohm MIN. DC100V 15V 5ppm MAX. 25C 3C Motional capacitance Aging (First year) Sealing Shock resistance 0.8 to1.7pF TYP. 1 x 10-2 Pa*m3 /s MAX. 5ppm MAX. Drop test of 3 times on a hard board from 75cm height or shock test of 3000G x 0.3ms x 1/2sin wave x 3 directions FREQUENCY vs TEMPERATURE CURVE http://www.citizencrystal.com/quartz/crystals/cmr250t_d.htm 4/2/2003 Citizen Crystals and Oscillators - CMR250T Page 2 of 2 DIMENSIONS: (UNIT=mm) RECOMENDED SOLDERING PATTERN: (UNIT=mm) http://www.citizencrystal.com/quartz/crystals/cmr250t_d.htm 4/2/2003