Programmable clock generators
22 July 2009
Electronics Technology
The newest members of IDT’s VersaClock family of timing devices – VersaClock III – are programmable clock generators specifically designed for use in high-performance consumer, telecommunications, networking and data communications applications, providing a cost-effective alternative to using multiple crystals and oscillators.
For design flexibility, the devices feature four internal PLLs, each individually programmable and able to generate four unique frequencies. In addition, EMI-reducing spread spectrum technology is available on two of the PLLs, ensuring high signal integrity. For even greater integration, VCXO versions are available to ensure compatibility with industry timing standards.
The new timing devices also feature an I²C interface, providing programmability during normal operation. The internal EEPROM allows the user to save and restore configuration of the device without having to reprogram it on power-up, saving valuable design time. Moreover, the new VersaClock devices can generate frequencies from 5 kHz to 500 MHz, and are also compatible with many different output types – from single-ended LVCMOS to differential LVDS, LVPECL and HCSL – to support all timing systems in a single device.
The VersaClock III devices feature low jitter and clock redundancy, with a glitchless automatic or manual switchover function that allows a secondary clock source to be selected if a clock error occurs during normal operation of the primary source. The devices are available in several packages, including 28-pin TSSOP and 32-pin VFQFPN packages.
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