| Package(s) : |
|---|
| 32-Pin RAD-PAK® Flat Package |
| Type |
| Clock Buffer |
| Radiation Performance: |
|---|
| SEL > 116MeV/mg/cm2 |
| SEUTH -3 MeV/mg/cm2 |
| SEU sat cross section: 1E-3/device |
| >100 krad (Si), depending upon space mission |
| Specifications At A Glance |
| 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 ½ and ¼ 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 |
| Compatible with Pentium™-based processor |
| Jitter < 200 ps peak-to-peak (< 25 ps RMS) |
| Low operating current |
| Outputs drive 50. terminated lines |
Maxwell Technologies’ 7B991 Programmable Skew Clock Buffers (PSCB) offer user-selectable control over system clock functions. These multiple-output clock drivers provide the system integrator with functions necessary to optimize 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.
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 units.
About RAD-PAK® Technology
Maxwell Technologies' patented RAD-PAK® packaging technology incorporates radiation shielding in the microcircuit package. It eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. In a GEO orbit, RAD-PAK provides greater than 100 krad (Si) radiation dose tolerance. This product is available with screening up to Class S.
