CY7C9925

PRELIMINARY CY7C9925 3.3V/2.5V Programmable Skew Clock Buffer Features All output pair skew <100 ps (typical) Input Frequency Range: 3.75 MHz to 200 MHz Output Frequency Range: 3.75 MHz to 200 MHz User-selectable output functions — Selectable skew to 18 ns — Inverted and non-inverted — Operation at 1⁄2 and 1⁄4 input frequency — Operation at 2x and 4x input frequency (input as low as 3.75 MHz) Functional Description The CY7C9925 RoboClock is 200-MHz Low-voltage Programmable Skew Clock Buffer that offers user-selectable control over system clock functions. This multiple-output clock driver 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 50Ω while delivering minimal and specified output skews and full-swing logic levels (LVTTL). Each output can be hardwired to one of nine delay or function configurations. Delay increments of 0.32 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 transmission 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...