MPC909 查看數據表（PDF） - Motorola => Freescale

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MPC909

LOW VOLTAGE CMOS 1:18 CLOCK DISTRIBUTION CHIP

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Low Voltage CMOS 1:18 Clock

Distribution Chip

MPC909

The MPC909 is a 1:18 low voltage clock distribution chip. The 18

outputs are LVCMOS or LVTTL compatible and feature the drive strength

to drive 50Ω series or parallel terminated transmission lines. With

output–to–output skews of 250ps, the MPC909 is ideal as a clock

distribution chip for the cost sensitive, high performance designs. With

low cost as one of the critical parameters, technology, design and test

choices were made which adversely affect part–to–part skew

performance. For very high performance applications, where part–to–part

skew is critical, please refer to the MPC940 datasheet.

LOW VOLTAGE CMOS

1:18 CLOCK

DISTRIBUTION CHIP

• LVCMOS/LVTTL Clock Inputs and Outputs

• 250ps Maximum Targeted Output–to–Output Skew

• Drives Up to 36 Independent Clock Lines

• Maximum Output Frequency of 100MHz

• High Impedance Output Enable

• 32–Lead TQFP Packaging

• 3.3V VCC Supply Voltage

FA SUFFIX

32–LEAD TQFP PACKAGE

CASE 873A–02

With a low output impedance, in both the HIGH and LOW logic states,

the output buffers of the MPC909 are ideal for driving series terminated

transmission lines. More specifically, each of the 18 MPC909 outputs can

drive two series terminated 50Ω transmission lines. With this capability,

the MPC909 has an effective fanout of 1:36 in applications where each

line drives a single load. With this level of fanout, the MPC909 provides

enough copies of low skew clocks for many high performance

synchronous systems.

The MPC909 is fully 3.3V compatible. 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.

This document contains information on a product under development. Motorola reserves the right to change or

discontinue this product without notice.

6/97

© Motorola, Inc. 1997

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