CX3SM CRYSTAL 800 kHz to 1.35 MHz Low Profile Miniature Surface Mount Quartz Crystal DESCRIPTION actual size The CX3SM quartz crystals are leadless devices designed for surface mounting on printed circuit boards or hybrid substrates. They are hermetically sealed in a rugged, miniature ceramic packages and are designed specifically for manufacturing temperatures up to 260OC. side view Glass Lid Shown PACKAGE DIMENSIONS FEATURES D Extensional mode Ideal for use with microprocessors Designed for low power applications Compatible with hybrid or PC board packaging TOP A BOTTOM E Low aging Full military testing available Ideal for battery operated applications D Designed and manufactured in the USA E B C EQUIVALENT CIRCUIT C0 1 L1 C1 TYP. R1 R1 Motional Resistance L1 Motional Inductance C1 Motional Capacitance C0 Shunt Capacitance 2 inches mm inches mm A 0.263 6.68 0.270 6.86 B 0.097 2.46 0.104 2.64 C - - D 0.052 1.32 0.058 1.47 E 0.030 0.76 0.035 0.89 DIM “C“” SUGGESTED LAND PATTERN 0.070 (1.78) MAX. DIM GLASS LID see below CERAMIC LID MAX inches mm inches mm SM1 0.053 1.35 0.067 1.70 SM2/SM4 0.055 1.40 0.069 1.75 SM3/SM5 0.058 1.47 0.072 1.83 0.110 (2.79) inches (mm) 0.210 (5.33) 10123 - 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 800 kHz - 1.35 MHz Functional Mode Extensional Calibration Tolerance + _ Load Capacitance 500 ppm (0.05%) 1000 ppm (0.1%) + _ 10000 ppm (1.0%) 7 pF Motional Resistance (R1) 5 kΩ MAX Motional Capacitance (C1) 1.2 fF Quality Factor (Q) 150 k Shunt Capacitance (C0) 1.0 pF Drive Level 3 µW MAX. 1 + _ Turning Point (T0) 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. 35OC 2 The low profile CX miniature surface mount 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 (f0) is 15 to 150 ppm above the crystal’s series resonant frequency (fS). Temperature Coefficient (k) -0.035 ppm/OC2 Note: Frequency f at temperature T is related to frequency f0 at turning point temperature T0 by: f-f0 2 = k(T-T0) f0 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 (1) + CS Aging, first year 5 ppm MAX Shock, survival 1000 g, 0.3 ms,1/2 sine Vibration, survival 10 g RMS, 20-1,000 Hz random Operating Temp. Range -10OC to +70OC (Commercial) -40OC to +85OC (Industrial) -55OC to +125OC (Military) Storage Temp. Range -55OC to +125OC 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. Max Process Temperature 260OC for 20 sec. The oscillation frequency (f0) is approximately equal to: 1. Tighter tolerances available. 2. Other values available. f0 = fS PACKAGING OPTIONS CX3SM [1 + 2(CC - Tape and Reel (Reference tape and reel data sheet 10109) TERMINATIONS Where f S C1 C0 S Blank = Glass Lid C = Ceramic Lid “S” if special or custom design. Blank if Std. SM1 1.0M , 500 Frequency Calibration Tolerance K = kHz @ 25OC M = MHz (in ppm) SM1 = Gold Plated SM2 = Solder Plated SM3 = Solder Dipped SM4 = Solder Plated (Lead Free) SM5 = Solder Dipped (Lead Free) ] (2) CONVENTIONAL CMOS PIERCE OSCILLATOR CIRCUIT Termination Gold Plated Solder Plated Solder Dipped Solder Plated (Lead Free) Solder Dipped (Lead Free) C + CL) = Series resonant frequency of the crystal = Motional Capacitance = Shunt Capacitance Rf BUFFER HOW TO ORDER CX3SM CRYSTALS CX3 1 0 - Tray Pack Designation SM1 SM2 SM3 SM4 SM5 CD + CG / AMPLIFIER I Operating Temp. Range: C = -10OC to +70OC I = -40OC to +85OC M = -55OC to +125OC S = Customer Specified CG CX3 XTAL RA OSC Freq (fO ) CD STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com 10123 - Rev C