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SEMICONDUCTOR TECHNICAL DATA

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1

REV 0

02/01

Low Voltage 1:18 Clock

Distribution Chip

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 50

Ω series or parallel

terminated transmission lines. With output–to–output 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 II

™ microprocessor

based design.

With a low output impedance (

≈12Ω), 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 12

Ω the

MPC942 can drive two series terminated transmission lines from each

output. This capability gives the MPC942 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 VCC power pins require either 2.5V or 3.3V. The 32–lead TQFP package was

chosen to optimize performance, board space and cost of the device. The 32–lead TQFP has a 7x7mm body size with a

conservative 0.8mm pin spacing.

Pentium II is a trademark of Intel Corporation.

MPC942C

LOW VOLTAGE

1:18 CLOCK

DISTRIBUTION CHIP

FA SUFFIX

32–LEAD TQFP PACKAGE

CASE 873A–02

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com