MPC942

The MPC942 is a 1:18 low voltage clock distribution chip with 2.5V or 3.3V LVCMOS output capabilities. The device is offered in two versions; the MPC942C has an LVCMOS input clock while the MPC942P has a LVPECL input clock. The 18 outputs are 2.5V or 3.3V LVCMOS compatible and feature the drive strength to drive 50W series or parallel terminated transmission lines. With outputtooutput skews of 200ps, the MPC942 is ideal as a clock distribution chip for the most demanding of synchronous systems. The 2.5V outputs also make the device ideal for supplying clocks for a high performance Pentium IIE microprocessor based design.
• LVCMOS/LVTTL Clock Input
• 2.5V LVCMOS Outputs for Pentium II Microprocessor Support
• 150ps Maximum Targeted OutputtoOutput Skew
• Maximum Output Frequency of 250MHz @ 3.3 V_CC
• 32Lead TQFP Packaging
• Single 3.3V or 2.5V Supply
With a low output impedance (912W), in both the HIGH and LOW logic states, the output buffers of the MPC942 are ideal for driving series terminated transmission lines. With an output impedance of 12W it can drive two series terminated transmission lines from each output. This capability gives it an effective fanout of 1:36. The MPC942 provides enough copies of low skew clocks for most high performance synchronous systems.

The LVCMOS/LVTTL input of the MPC942C provides a more standard LVCMOS interface. The OE pins will place the outputs into a high impedance state. The OE pin has an internal pullup resistor.

The MPC942 is a single supply device. The V_CC power pins require either 2.5V or 3.3V. The 32lead TQFP package was chosen to optimize performance, board space and cost of the device. The 32lead TQFP has a 7x7mm body size with a conservative 0.8mm pin spacing.