CX-2 CRYSTAL 760 kHz to 1.35 MHz TM Miniature Quartz Crystal DESCRIPTION The CX-2 quartz crystal is a high quality extensional mode resonator. The CX-2 is hermetically sealed in a rugged, miniature ceramic package, one-fourth the size of an eightpin mini-DIP. The CX-2 crystal is manufactured using the STATEK-developed photolithographic process, and was designed utilizing the experience acquired by producing millions of crystals for industrial, commercial, military and medical applications. actual size FEATURES Extensional mode Ideal for use with microprocessors Designed for low power applications Compatible with hybrid or PC board packaging Low aging Full military testing available PACKAGE DIMENSIONS Ideal for battery operated applications -02 End Lead Designed and manufactured in the USA The CX crystal is hermetically sealed in a ceramic package. Normal handling and soldering precautions for small, low thermal mass parts are adequate when installing or testing CX crystals. CX crystals may be wave soldered, with proper precaution taken to avoid desoldering the leads. A slow machine rate or too high a pre-heat temperature or solder bath temperature can damage the crystals. Lead to package solder interface temperature should not exceed 175oC, glass lid to package seal rim temperature should not exceed 210oC. If the seal rim reaches temperatures above the maximum specified, the package may lose its hermeticity. Loss of hermeticity results in a frequency decrease and motional resistance increase. .094 (2.39) 2 .260 (6.60) 1 .200 (5.08) .205 (5.21) A R1 2 3 2 .210 (5.33) 3 A .050(1.27) -04 Side Lead .260 (6.60) INCHES (mm) .094 (2.39) 1.Terminal 1 is electrically connected internally to terminal 3. C0 C1 1 3 1 2 Notes: EQUIVALENT CIRCUIT L1 .260 (6.60) .094 (2.39) PACKAGE HANDLING 1 -03 Side Lead .210 (5.33) 2.Lead dimensions Width: .013” (.33mm) Typical Thickness: .007” (.18mm) Typical 3.A = Glass Lid .080 (2.03) max. Ceramic Lid .095 (2.41) max. .100 (2.54) A R1 Motional Resistance L1 Motional Inductance C1 Motional Capacitance C0 Shunt Capacitance 10139 - Rev C STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com TYPICAL APPLICATION FOR A PIERCE OSCILLATOR SPECIFICATIONS Specifications are typical at 25OC unless otherwise noted. Specifications are subject to change without notice. Frequency Range 760 kHz - 1.35 MHz Functional Mode Extensional Calibration Tolerance* A B C + _ 0.05% ( +_ 500ppm) 0.1% + _ 1.0% + _ Load Capacitance 7 pF Motional Resistance (R1) 5 kV MAX Motional Capacitance (C1) 1.2fF Quality Factor (Q) 150 k Shunt Capacitance (C0) 1.0 pF Drive Level 3 mW MAX. Turning Point (TO)** 35OC The low profile CX miniature leaded crystal is ideal for small, high density, battery operated portable products. The CX crystal designed in a Pierce oscillator (single inverter) circuit provides very low current consumption and high stability. A conventional CMOS Pierce oscillator circuit is shown below. The crystal is effectively inductive and in a PI-network circuit with CD and CG provides the additional phase shift necessary to sustain oscillation. The oscillation frequency (fO) is 15 to 150 ppm above the crystal’s series resonant frequency (fs). Drive Level RA is used to limit the crystal’s drive level by forming a voltage divider between RA and CD. RA also stabilizes the oscillator against changes in the amplifiers output resistance (R0). RA should be increased for higher voltage operation. Temperature Coefficient (k) -0.035 ppm/OC2 Note: Frequency (f) deviation from frequency (fO) @ turning point temperature (TO); f-fO = k(T-T )2 O fO Load Capacitance The CX crystal calibration tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (CL). CL is approximately equal to: CL = CD x CG CD + CG (1) + CS Aging, first year 5ppm MAX. Shock 1000g peak, 0.3 msec.,1/2 sine Vibration, survival 10g rms, 20-1,000 Hz random Operating Temperature -10OC to +70OC Commercial -40OC to +85OC Industrial -55OC to +125OC Military NOTE: CD and CG include stray layout to ground and Cs is the stray shunt capacitance between the crystal terminal. In practice, the effective value of CL will be less than that calculated from CD, CG and CS values because of the effect of the amplifier output resistance. CS should be minimized. Storage Temperature -55OC to +125OC The oscillation frequency (fO) is approximately equal to: Max Process Temperature See package handling [ fO = fS 1 + * Tighter frequency calibration available. ** Other turning point available. HOW TO ORDER CX-2-LEADED CRYSTALS CX-2 “S” if special or custom design. Blank if Std. -03 1.0 MHz Leads -02 -03 -04 Frequency *Other calibration fill in ppm. ( Calibration Tolerance* @ 250C (A) (B) (C) A / I Where f S C1 C0 C1 2(C0 + CL) ] (2) = Series resonant frequency of the crystal = Motional Capacitance = Shunt Capacitance ) Temp. Range: C = Commercial I = Industrial M = Military S = Specify CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT Rf BUFFER AMPLIFIER CS PACKAGING RA OSC Freq (fO) Contact factory for design guidelines CX-2-Leaded -Tray Pack (Standard) CG CX-1 CX-2 CD 10139 - Rev C STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com