MPC9817 Datasheet, PDF (1/8 Pages) Freescale Semiconductor, Inc – Clock Generator for PowerQUICC and PowerPC Microprocessors and Microcontrollers

Freescale Semiconductor
Technical Data
MPC9817
Rev 1, 11/2004
Clock Generator for PowerQUICC
and PowerPC Microprocessors and
Microcontrollers
MPC9817
The MPC9817 is a PLL-based clock generator specifically designed for
Freescale Semiconductor Microprocessor and Microcontroller applications
including the PowerPC and PowerQUICC. This device generates the
microprocessor input clock and other microprocessor system and bus clocks at
any one of four output frequencies. These frequencies include the popular
33- and 66-MHz PCI bus frequencies. The device offers five low-skew clock
outputs plus three reference outputs. The clock input reference is 25 MHz and
may be derived from an external source or by the addition of a 25-MHz crystal to
the on-chip crystal oscillator. The extended temperature range of the MPC9817
supports telecommunication and networking requirements.
Features
• 5 LVCMOS outputs for processor and other system circuitry
• 3 Buffered 25-MHz reference clock outputs
• Crystal oscillator or external reference input
• 25-MHz input reference frequency
• Selectable output frequencies include: 25, 33, 50, or 66 MHz
• Low cycle-to-cycle and period jitter
• Package: 20-lead SSOP
• 3.3-V supply
• Supports computing, networking, and telecommunications applications
• Ambient temperature range: –40°C to +85°C
MICROPROCESSOR
CLOCK GENERATOR
SD SUFFIX
20 SSOP PACKAGE
CASE 1461-01
EN SUFFIX
20 SSOP PACKAGE
Pb-FREE PACKAGE
CASE 1461-01
Functional Description
The MPC9817 uses a PLL with a 25-MHz input reference frequency to generate a single bank of five configurable LVCMOS
output clocks. The output frequency of this bank is configurable to either 25, 33, 50, or 66 MHz by two FSEL pins. The 25-MHz
reference may be either an external frequency source or a 25-MHz crystal. The 25-MHz crystal is directly connected to the
XTAL_IN and XTAL_OUT pins with no additional components required. An external reference may be applied to the XTAL_IN
pin with the XTAL_OUT pin left floating. The input reference, whether provided by a crystal or an external input, is also directly
buffered to a second bank of three LVCMOS outputs. These outputs may be used as the clock source for processor I/O
applications such as an Ethernet PHY. When FSEL0 and FSEL1 are both configured low, the QA outputs are directly fed from
the input reference providing a total of eight low-skew 25-MHz outputs. For all other combinations of FSEL0 and FSEL1 the
single-ended LVCMOS outputs provide five low-skew outputs for use in driving a microprocessor or microcontroller clock input
as well as other system components.
The MPC9817 is packaged in a 20-lead SSOP package.
© Freescale Semiconductor, Inc., 2004. All rights reserved.