CY7B992

92 CY7B991 CY7B992 Programmable Skew Clock Buffer Features All output pair skew <100 ps typical (250 max.) 3.75- to 80-MHz output operation 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) Zero input to output delay 50% duty-cycle outputs Outputs drive 50Ω terminated lines Low operating current 32-pin PLCC/LCC package Jitter < 200 ps peak-to-peak (< 25 ps RMS) Compatible with a Pentium™-based processor functions. These multiple-output clock drivers provide 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 (CY7B991 TTL or CY7B992 CMOS). Each output can be hardwired to one of nine delay or function configurations. Delay increments of 0.7 to 1.5 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 PSCB is combined with the selectable output skew functions, the user can create output-to-output delays of up to ±12 time u...