DATA SHEET
Low Voltage PLL Clock Driver MPC9351
MPC9351 REVISION 7 3/14/16 1 ©2016 Integrated Device Technology, Inc.
The MPC9351 is a 2.5V and 3.3V compatible, PLL based clock generator
targeted for high performance clock distribution systems. With output
frequencies of up to 200 MHz and a maximum output skew of 150ps, the
MPC9351 is an ideal solution for the most demanding clock tree designs. The
device offers 9 low-skew clock outputs, each is configurable to support the
clocking needs of the various high-performance microprocessors including the
PowerQUICC II integrated communication microprocessor. The extended
temperature range of the MPC9351 supports telecommunication and networking
requirements.The device employs a fully differential PLL design to minimize
cycle-to-cycle and long-term jitter.
Features
• 9 Outputs LVCMOS PLL Clock Generator
• 25 – 200MHz Output Frequency Range
• Fully Integrated PLL
• 2.5V and 3.3V Compatible
• Compatible to Various Microprocessors Such as PowerQuicc II
• Supports Networking, Telecommunications and Computer Applications
• Configurable Outputs: Divide-by-2, 4 and 8 of VCO Frequency
• LVPECL and LVCMOS Compatible Inputs
• External Feedback Enables Zero-Delay Configurations
• Output Enable/disable and Static Test Mode (PLL Enable/Disable)
• Low Skew Characteristics: Maximum 150ps Output-to-Output
• Cycle-to-Cycle Jitter Max. 22ps RMS
• 32-Lead LQFP Package, Pb-Free
• Ambient Temperature Range -40°C to +85°C
• For functional replacement use 8T49N285
Functional Description
The MPC9351 utilizes PLL technology to frequency and phase lock its outputs onto an input reference clock. Normal operation
of the MPC9351 requires a connection of one of the device outputs to the EXT_FB input to close the PLL feedback path. The
reference clock frequency and the output divider for the feedback path determine the VCO frequency. Both must be selected to
match the VCO frequency range. With available output dividers of divide-by-2, divide-by-4 and divide-by-8, the internal VCO of
the MPC9351 is running at either 2x, 4x or 8x of the reference clock frequency. The frequency of the QA, QB, QC and QD outputs
is either the one-half, one-fourth or one-eighth of the selected VCO frequency and can be configured for each output bank using
the FSELA, FSELB, FSELC and FSELD pins, respectively. The available output-to-input frequency ratios are 4:1, 2:1, 1:1, 1:2
and 1:4. The REF_SEL pin selects the differential LVPECL (PCLK and PCLK) or the LVCMOS compatible reference input
(TCLK). The MPC9351 also provides a static test mode when the PLL enable pin (PLL_EN) is pulled to logic low state. In test
mode, the selected input reference clock is routed directly to the output dividers bypassing the PLL. The test mode is intended
for system diagnostics, test and debug purposes. This test mode is fully static and the minimum clock frequency specification
does not apply. The outputs can be disabled by deasserting the OE
pin (logic high state). In PLL mode, deasserting OE causes
the PLL to loose lock due to no feedback signal presence at EXT_FB. Asserting OE
will enable the outputs and close the phase
locked loop, also enabling the PLL to recover to normal operation. The MPC9351 is fully 2.5 V and 3.3 V compatible and requires
no external loop filter components. All inputs except PCLK and PCLK
accept LVCMOS signals, while the outputs provide
LVCMOS compatible levels with the capability to drive terminated 50 transmission lines. For series terminated transmission
lines, each of the MPC9351 outputs can drive one or two traces giving the device an effective fanout of 1:18. The device is pack-
aged in a 7x7 mm
2
32-lead LQFP package.
Application Information
The fully integrated PLL of the MPC9351 allows the low-skew outputs to lock onto a clock input and distribute it with essentially
zero propagation delay to multiple components on the board. In zero-delay buffer mode, the PLL minimizes phase offset between
the outputs and the reference signal.
MPC9351
LOW VOLTAGE
2.5 V AND 3.3 V PLL
CLOCK GENERATOR
AC SUFFIX
32-LEAD LQFP PACKAGE
Pb-FREE PACKAGE
CASE 873A-03
PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES SEPTEMBER 7, 2016
