Description:
The FD51xxT-32.768K is derived from the PLE FD51T series Programmable CMOS Clock Oscillator which is a modular PLL-based low cost, high-performance oscillator. The frequency output is set to 32.768KHz. The FD51xxT-32.768K base frequency is a 24.576MHz AT cut fundamental mode crystal.
The FD5T has a separate output supply pin, VDDOUT, for either 1.8, 2.5 or 3.3V output logic levels. The device supply, VDD which provides power to all the internal circuits, is nominally 1.8V.
The PLL is only utilized to support Spread Spectrum Clocking (SSC), in all other cases the PLL is disabled to reduce power. SSC may be programmed to be either center-spread or down-spread. This is an important technique to reduce electro-magnetic interference (EMI).

• Pletronics’ FD51T Series is a quartz crystal
   controlled precision square wave generator
• Output frequency 32.768KHz
• Selectable low jitter or spread spectrum output.
• Device characteristics may be either factory or
   field programmable
• Tape and Reel or cut tape packaging is available
• 3.2 x 5 mm LCC Ceramic Package
• Stability is much better than
   an XY cut watch crystal
• Very fast Start-up time, <10mS
• Low power
• 1.8V, 2.5 or 3.3V LVCMOS outputs
• Designed for high density SMD needs