GENERAL DESCRIPTION
The XRK69772 is a highly flexible device. It can be configured to accept either a crystal oscillator input or one of two LVCMOS compatible inputs for use as the input reference clock source. To support clock redundancy, two LVCMOS inputs are provided. Switching the internal reference clock is controlled by the control input, CLK_SEL. The XRK69772 uses PLL technology to frequency lock its outputs to the input reference clock. The divider in the feedback path will determine the frequency of the VCO. Each of the separate output banks can individually divide down the VCO output frequency. This allows the XRK69772 to generate a multitude of different bank frequency ratios and output-to-input frequency ratios. The outputs of the XRK69772 can individually be immobilized, in the low state, by use of the stop clock feature. All outputs except QC0 and QFB can be immobilized through a 2 pin serial interface. Global output disabling and reset can be achieved the control input MR/OE.
Exar Corporation
