CY7C9915

The CY7C9915 RoboClock is a 150-MHz Low-voltage Programmable Skew Clock Buffer that offers user-selectable control over system clock functions. This multiple-output clock driver,CY7C9915 provides the system integrator with functions necessary to optimize the timing of high-performance computer systems. Eight individual drivers, arranged as four pairs of user-controllable outputs, can each drive terminated transmission lines with impedances as low as 50 while delivering minimal and specified output skews and full-swing logic levels (LVTTL).

Each output of the CY7C9915 can be hardwired to one of nine delay or function configurations. Delay increments of 0.42 to 1.6 ns are determined by the operating frequency with outputs able to skew up to ±6 time units from their nominal "zero" skew position. The completely integrated PLL allows external load and  ransmission line delay effects to be canceled. When this "zero delay" capability of the LVPSCB is combined with the selectable output skew functions, the user can create output-to-output delays of up to ±12 time units.

Divide-by-two and divide-by-four output functions of the CY7C9915 are provided for additional flexibility in designing complex clock systems. When combined with the internal PLL, these divide functions allow distribution of a low-frequency clock that can be multiplied by two or four at the clock destination. This facility minimizes clock distribution difficulty while allowing maximum system clock speed and flexibility.