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Clock generators target low-skew apps

Posted: 21 Apr 2006     Print Version  Bookmark and Share

Keywords:XRK69772  XRK69773  XRK69774  XRK697H73  clock generator 

Exar Corp. added a family of clock generators to its clock and timing solution portfolio, which spans applications from telecommunications, networking to servers and consumer applications.

This family of PLL-based, low voltage CMOS (LVCMOS) clock generators includes the XRK69772, XRK69773, XRK69774 and XRK697H73. The XRK6977x family can generate different bank frequency ratios and output-to-input frequency ratios from a single clock signal source, said the company. This is accomplished by each device using a PLL circuit to frequency lock its outputs to the input reference clock. The divider in the feedback path then determines the frequency of the VCO. In addition, each of the separate output banks can individually divide down the VCO output frequency.

The product family accepts either a crystal oscillator input or one of two LVCMOS-compatible inputs for use as the input reference clock source. The XRK697H73 can accept either PECL or one of the two LVCMOS inputs. The XRK69772, XRK69773 and XRK697H73 can select between one of three reference inputs and provide (12) LVCMOS outputs—(3) banks of (4) for clock distribution, (1) for feedback and (1) for synchronization. The XRK69774 can select between one of two reference inputs and provide (14) LVCMOS outputs—(2) banks of (5) and (1) bank of (4) for clock distribution and (1) for feedback. The XRK697H73 adds the higher drive and lower impedance capability to XRK69773. To support clock redundancy, two LVCMOS inputs are provided where switching the internal reference clock is controlled by the control input.

The XRK69772, XRK69773, XRK69774 and XRK697H73 are housed in a 52-pin LQFP package. Currently available, the clock generators are priced at Rs.170.82 ($3.82) for 10,000-unit quantities.

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