NEW ROCHELLE, N.Y. MF Electronics Corp.'s T3312 and T3212 clock oscillators are miniature, industrial-grade surface-mount devices based on inverted mesa crystals and a rugged multilayer gold/ceramic package design. With electrical, thermal and mechanical advances tested in MIL and COTS applications, the oscillators are targeted at global datacom equipment such as outdoor repeaters and weather reporting stations in desert or arctic environments.
The oscillators also afford a heightened comfort level for conservative manufacturers designing room-temperature equipment. The components feature 5 ps RMS jitter over the -40 degrees C to 85 degrees C extended temperature range.
The SMD clock oscillators T3312 and T3212 provide time/frequency reference signals at frequencies from 20 kHz to 100 MHz. The oscillators operate from 3.3 volts (T3312) or 5 V (T3212) and draw 35 mA and 45 mA maximum load current, respectively. Waveform symmetry is better than 45/55.
Models T3312 and T3212 drive CMOS and TTL loads and incorporate 0.1 bypass capacitors for power supply decoupling. They accept tristate input for automatic test equipment diagnostics. The new oscillators may be used in double-sided pc-board designs, as well as portable, personal and handheld devices.
The oscillators undergo 24 hours of burn-in and are then guaranteed to meet the plus/minus 50-ppm frequency stability specification over -40 degrees C to 85 degrees C temperatures. First year drift of the "green" oscillator is less than plus/minus 3 ppm; long-term drift is plus/minus 1 ppm/year.
T3312 and T3212 oscillators are glass-sealed in gold/ceramic surface-mount packages measuring 5 x 7 x 1.9 mm. They are available on tape and reel for automated assembly equipment.
Unlike large SMD parts, the miniature T3312 and T3212 oscillators do not require flexible J-leads. With a 5 x 7-mm footprint and solder pads spanning 0.2 inches of pc-board surface, the minuscule amount of pc-board bending that occurs across a 7-mm stretch of surface is resisted by the T3312 and T3212 oscillator soldered joints.
Pricing in OEM quantities for the T3312 and T3212 is $8.75. Delivery is stock to six weeks.
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EETInfo No. 625