MILPITAS, CALIF. International Microcircuits Inc.'s 11-member line of zero-delay buffers eliminates clock-propagation delays and reduces electrical noise in PCs, workstations, network cards, ADSL modems and set-top boxes.
The buffers reduce electrical noise produced by multiple, long clock connections by receiving a single clock line and distributing it to local circuitry using up to 14 output pins. Randy Frederick, vice president of marketing, said propagation delays and skew problems are caused by variations in the length and capacitive loading on printed-circuit-board connections. Those problems grow worse as clock speeds get faster, he said, adding that clock signals can be delayed to the point that the signal's edges can miss the data it was intended to latch.
The buffers offer a pin-to-pin output skew of less than 200 ps and jitter of less than 200 ps. They can operate at up to 150 MHz from a single 3.3-V supply. They are available in 8- and 16-pin SOIC, 16- and 24-pin TSSOP and 32- and 52-pin TQFP packages. Prices range from $1.35 to $2.95 in 1,000-piece quantities.
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EETInfo No. 605