MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order Number: MPC9446/D

Rev 1, 03/2002

1

2.5V and 3.3V LVCMOS Clock

Fanout Buffer

The MPC9446 is a 2.5V and 3.3V compatible 1:10 clock distribution

buffer designed for low-voltage mid-range to high-performance telecom,

networking and computing applications. Both 3.3V, 2.5V and dual supply

voltages are supported for mixed-voltage applications. The MPC9446

offers 10 low-skew outputs and 2 selectable inputs for clock redundancy.

The outputs are configurable and support 1:1 and 1:2 output to input

frequency ratios. The MPC9446 is specified for the extended temperature

range of --40°Cto85°C.

Features

computer applications

Functional Description

The MPC9446 is a full static fanout buffer design supporting clock

frequencies up to 250 MHz. The signals are generated and retimed

on-chip to ensure minimal skew between the three output banks. Two

independent LVCMOS compatible clock inputs are available. This feature

supports redundant clock sources or the addition of a test clock into the

system design. Each of the three output banks can be individually

supplied by 2.5V or 3.3V supporting mixed voltage applications. The

FSELx pins choose between division of the input reference frequency by

one or two. The frequency divider can be set individually for each of the

three output banks. The MPC9446 can be reset and the outputs are

disabled by deasserting the MR/OE pin (logic high state). Asserting

MR/OE will enable the outputs.

All inputs accept LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated

50 Ω transmission lines. Please consult the MPC9456 specification for a 1:10 mixed voltage buffer with LVPECL compatible

inputs. For series terminated transmission lines, each of the MPC9446 outputs can drive one or two traces giving the devices an

FA SUFFIX

LQFP PACKAGE

CASE 873A

MPC9446

LOW VOLTAGE SINGLE OR

DUAL SUPPLY 2.5V AND 3.3V

LVCMOS CLOCK

DISTRIBUTION BUFFER

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com