MPC9855

Rev 2, 1/2005

Freescale Semiconductor

Technical Data

© Freescale Semiconductor, Inc., 2005. All rights reserved.

Preliminary Information

Clock Generator for PowerQUICC

and PowerPC Microprocessors

The MPC9855 is a PLL based clock generator specifically designed for

Freescale Microprocessor and Microcontroller applications including the

PowerPC and PowerQUICC. This device generates a microprocessor input

clock. The microprocessor clock is selectable in output frequency to any of the

commonly used microprocessor input and bus frequencies. The device offers

eight low skew clock outputs in two banks, each configurable to support different

clock frequencies. The extended temperature range of the MPC9855 supports

telecommunication and networking requirements.

Features

•

8 LVCMOS outputs for processor and other circuitry

•

Crystal oscillator or external reference input

•

25 or 33 MHz Input reference frequency

•

Selectable output frequencies include = 200, 166, 133,125, 111, 100, 83, 66,

50, 33, or 16 MHz

•

Buffered reference clock output (2 copies)

•

Low cycle-to-cycle and period jitter

•

100-lead PBGA package

•

100-lead Pb-free Package Available

•

3.3 V supply with 3.3 V or 2.5 V LVCMOS output supplies

•

Supports computing, networking, telecommunications applications

•

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

•

100-lead PBGA package

•

100-lead Pb-free Package Available

Functional Description

The MPC9855 uses either a 25 or 33 MHz reference frequency to generate 8 LVCMOS output clocks, of which, the frequency

is selectable from 16 MHz to 200 MHz. The reference is applied to the input of a PLL and multiplied to 2 GHz. Output dividers,

divide this frequency by 10, 12, 15, 16, 18, 20, 24, 30, 40, 60, or 120 to produce output frequencies of 200, 166, 133, 125, 111,

100, 83, 66, 50, 33, or 16 MHz. The single-ended LVCMOS outputs provide 8 low skew outputs for use in driving a microprocessor

or microcontroller clock input as well as other system components. The input reference, either crystal or external input is also

buffered to a separate dual outputs that my be used as the clock source for a Ethernet PHY if desired.

The reference clock may be provided by either an external clock input of 25 or 33 MHz. An internal oscillator requiring a 25

MHz crystal for frequency control may also be used. The external clock source my be applied to either of two clock inputs and

selected via the CLK_SEL control input. Both single ended LVCMOS and differential LVPECL inputs are available. The crystal

oscillator or external clock input is selected via the input pin of XTAL_SEL. Other than the crystal, no external components are

required for crystal oscillator operation. The REF_33 MHz configuration pin is used to select between a 33 and 25 MHz input

frequency.

The MPC9855 is packaged in a 100 lead MAPBGA package to optimize both performance and board density.

ORDERING INFORMATION

Device

Temp. Range

Case No.

Package

MPC9855

–40°C to +85°C

1462-01

100 lead MAPBGA

MPC9855

MICROPROCESSOR

CLOCK GENERATOR

VF SUFFIX

VM SUFFIX (Pb-FREE)

100 MAPBGA PACKAGE

CASE 1462-01