Freescale Semiconductor, Inc.
Order number: MPC9653A
DATRAevS3,H08E/2E00T4
TECHNICAL DATA
MPC9653A
MPC9653A
3.3 V 1:8 LVCMOS PLL Clock
3.3 V 1:8 LVCMOS PLL Clock
Generator
Generator
The MPC9653A is a 3.3 V compatible, 1:8 PLL based clock generator and
zero-delay buffer targeted for high performance low-skew clock distribution in
mid-range to high-performance telecom, networking and computing
applications. With output frequencies up to 125 MHz and output skews less
than 150 ps the device meets the needs of the most demanding clock
applications.
LOW VOLTAGE
3.3 V LVCMOS 1:8
PLL CLOCK GENERATOR
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
1:8 PLL based low-voltage clock generator
Supports zero-delay operation
3.3 V power supply
Generates clock signals up to 125 MHz
PLL guaranteed to lock down to 145 MHz, output frequency = 36.25 MHz
Maximum output skew of 150 ps
Differential LVPECL reference clock input
External PLL feedback
Drives up to 16 clock lines
32-lead LQFP packaging
32-lead Pb-free Package Available
Ambient temperature range 0°C to +70°C
Pin and function compatible to the MPC953 and MPC9653
FA SUFFIX
32-LEAD LQFP PACKAGE
CASE 873A-03
AC SUFFIX
32-LEAD LQFP PACKAGE
CASE 873A-03
Functional Description
The MPC9653A utilizes PLL technology to frequency lock its outputs onto an input reference clock. Normal operation of the
MPC9653A requires the connection of the QFB output to the feedback input to close the PLL feedback path (external feedback). With
the PLL locked, the output frequency is equal to the reference frequency of the device and VCO_SEL selects the operating frequency
range of 25 to 62.5 MHz or 50 to 125 MHz. The two available post-PLL dividers selected by VCO_SEL (divide-by-4 or divide-by-8)
and the reference clock frequency determine the VCO frequency. Both must be selected to match the VCO frequency range. The
internal VCO of the MPC9653A is running at either 4x or 8x of the reference clock frequency. The MPC9653A is guaranteed to lock
in a low power PLL mode in the high frequency range (VCO_SEL = 0) down to PLL = 145 MHz or F = 36.25 MHz.
ref
The MPC9653A has a differential LVPECL reference input along with an external feedback input. The device is ideal for use as a
zero delay, low skew fanout buffer. The device performance has been tuned and optimized for zero delay performance.
The PLL_EN and BYPASS controls select the PLL bypass configuration for test and diagnosis. In this configuration, the selected
input reference clock is bypassing the PLL and routed either to the output dividers or directly to the outputs. The PLL bypass config-
urations are fully static and the minimum clock frequency specification and all other PLL characteristics do not apply. The outputs can
be disabled (high-impedance) and the device reset by asserting the MR/OE pin. Asserting MR/OE also causes the PLL to loose lock
due to missing feedback signal presence at FB_IN. Deasserting MR/OE will enable the outputs and close the phase locked loop, en-
abling the PLL to recover to normal operation.
The MPC9653A is fully 3.3 V compatible and requires no external loop filter components. The inputs (except PCLK) accept LVC-
MOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated 50 Ω transmission lines. For
series terminated transmission lines, each of the MPC9653A outputs can drive one or two traces giving the devices an effective fanout
2
of 1:16. The device is packaged in a 7x7 mm 32-lead LQFP package.
FREESCALE SEMICONDUCTOR ADVANCED CLOCK DRIVERS DEVICE DATA
529
MPC9653A
IDT™ 3.3 V 1:8 LVCMOS PLL Clock Generator
Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc
1