MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

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1

REV 1.0

3/99

Low Voltage 1:18 Clock

Distribution Chip

The MPC9109 is a 1:18 low voltage clock distribution chip with 2.5V or

3.3V LVCMOS output capabilities. The device features the capability to

select either a differential LVPECL or an LVCMOS compatible input. 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 MPC9109 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. For a higher

performance version of the 9109 refer to the MPC940L data sheet.

• Dual VCC Supply Voltage, 3.3V Core and 2.5V Output

• Single 3.3V VCC Supply Voltage for 3.3V Outputs

• Single 2.5V VCC Supply Voltage for 2.5V I/O

With a low output impedance (

≈20Ω), in both the HIGH and LOW logic

states, the output buffers of the MPC9109 are ideal for driving series

terminated transmission lines. With a 20

Ω output impedance the 9109

has the capability of driving two series terminated lines from each output.

This gives the device an effective fanout of 1:36. If a lower output

impedance is desired please see the MPC942 data sheet. If better

performance is desired please see the MPC940L data sheet.

The differential LVPECL inputs of the MPC9109 allow the device to interface directly with a LVPECL fanout buffer like the

MC100EP111 to build very wide clock fanout trees or to couple to a high frequency clock source. The LVCMOS input provides a

more standard interface for applications requiring only a single clock distribution chip at relatively low frequencies. In addition, the

two clock sources can be used to provide for a test clock interface as well as the primary system clock. A logic HIGH on the

LVCMOS_CLK_Sel pin will select the LVCMOS level clock input. All inputs of the MPC9109 have internal pullup/pulldown

resistor so they can be left open if unused.

The MPC9109 is a single or dual supply device. The device power supply offers a high degree of flexibility. The device can

operate with a 3.3V core and 3.3V output, a 3.3V core and 2.5V outputs as well as a 2.5V core and 2.5V outputs. The 32–lead

QFP 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.

MPC9109

LOW VOLTAGE

1:18 CLOCK

DISTRIBUTION CHIP

FA SUFFIX

32–LEAD QFP PACKAGE

CASE 873A–02

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com