MPC9449 查看數據表（PDF） - Motorola => Freescale

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MPC9449

3.3V/2.5V 1:15 PECL/LVCMOS Clock Fanout Buffer

Motorola => Freescale 

MOTOROLA

Freescale Semiconductor, Inc.

Order Number: MPC9449/D

SEMICONDUCTOR TECHNICAL DATA

Rev 1, 08/2002

3.3V/2.5V 1:15 PECL/LVCMOS

Clock Fanout Buffer

MPC9449

The MPC9449 is a 3.3V or 2.5V compatible, 1:15 clock fanout buffer

targeted for high performance clock tree applications. With output

frequencies up to 200 MHz and output skews less than 200 ps the device

meets the needs of the most demanding clock applications.

Features

• 15 LVCMOS compatible clock outputs

3.3V/2.5V 1:15

PECL/LVCMOS

• Two selectable LVCMOS and one differential LVPECL compatible clock

inputs

CLOCK FANOUT BUFFER

• Selectable output frequency divider (divide-by-one and divide-by-two)

• Maximum clock frequency of 200 MHz

• Maximum clock skew of 200 ps

• High-impedance output control

• 3.3V or 2.5V power supply

• Drives up to 30 series terminated clock lines

• Ambient temperature range –40°C to +85°C

• 52 lead LQFP packaging

• Supports clock distribution in networking, telecommunication and

computing applications

• Pin and function compatible to MPC949

FA SUFFIX

52 LEAD LQFP PACKAGE

CASE 848D

Functional Description

The MPC9449 is specifically designed to distribute LVCMOS

compatible clock signals up to a frequency of 200 MHz. The device has

15 identical outputs, organized in 4 output banks. Each output bank

provides a retimed or frequency divided copy of the input signal with a

near zero skew. The output buffer supports driving of 50Ω terminated

transmission lines on the incident edge: each output is capable of driving

either one parallel terminated or two series terminated transmission lines.

Two selectable LVCMOS compatible clock inputs are available. This feature supports redundant differential clock sources. In

addition, the MPC9449 accepts one differential PECL clock signal. The DSELx pins choose between division of the input

reference frequency by one or two. The frequency divider can be set individually for each of the four output banks. Applying the

OE control will force the outputs into high-impedance mode.

All inputs have an internal pull-up or pull-down resistor preventing unused and open inputs from floating. The device supports a

2.5V or 3.3V power supply and an ambient temperature range of –40°C to +85°C. The MPC9449 is pin and function compatible

but performance-enhanced to the MPC949. The device is packaged in a 52-lead LQFP package.

© Motorola, Inc. 2002

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