PCK942P

General description

The PCK942P is a 1 : 18 low voltage clock distribution chip with 2.5 V or 3.3 V LVCMOS output capabilities. The device is offered in two versions: the PCK942C has an LVCMOS input clock, while the PCK942P has a LVPECL input clock. The 18 outputs are 2.5 V or 3.3 V LVCMOS compatible and feature the drive strength to drive 50 Ohm series-terminated transmission lines. With output-to-output skews of 200 ps, the PCK942P is ideal as a clock distribution chip for the most demanding of synchronous systems. The 2.5 V output also makes the device ideal for supplying clocks for a higher performance Pentium II microprocessor-based design.

With a low output impedance of approximately 12 Ohm, in both the HIGH and LOW logic states, the output buffers of the PCK942P are ideal for driving series-terminated transmission lines. With an output impedance of 12 Ohm, the PCK942P can drive two series-terminated transmission lines from each output. This capability gives the PCK942P an effective fan-out of 1 : 36. The PCK942P provides enough copies of low skew clocks for most high performance synchronous systems.

The differential LVPECL inputs of the PCK942P allow the device to interface directly with a LVPECL fan-out buffer like the MC100EP111 to build very wide clock fan-out trees or to couple to a high frequency clock source. The OE pin will place the outputs to a high-impedance state. The OE pin has an internal pull-up resistor.

The PCK942P is a single supply device. The VCC power pins require either 2.5 V or 3.3 V. The 32-lead LQFP package was chosen to optimize performance, board space, and cost of the device. The 32-lead LQFP package has a 7 mm X 7 mm body size with a conservative 0.8 mm pin spacing.

Features

• LVPECL clock input
• 2.5 V LVCMOS outputs for Pentium II microprocessor support
• 200 ps maximum targeted output-to-output skew
• Maximum output frequency of 250 MHz at 3.3 V V_CC
• 32-lead LQFP packaging
• Single 3.3 V or 2.5 V supply voltage

Block diagrams/pinning

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