MPC9653AAC

MPC9653AAC Datasheet

MPC9653A Rev 4, 10/2004

Part	Datasheet
MPC9653AAC	MPC9653AAC (pdf)

Related Parts	Information
MPC9653AFAR2	MPC9653AFAR2
MPC9653AFA	MPC9653AFA

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Freescale Semiconductor Technical Data V 1:8 LVCMOS PLL Clock Generator MPC9653A The MPC9653A is a 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 V LVCMOS 1:8 PLL CLOCK GENERATOR • 1:8 PLL based low-voltage clock generator • Supports zero-delay operation • V power supply • Generates clock signals up to 125 MHz • PLL guaranteed to lock down to 145 MHz, output frequency = 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 Functional Description FA SUFFIX 32-LEAD LQFP PACKAGE CASE 873A-03 AC SUFFIX 32-LEAD LQFP PACKAGE Pb-FREE PACKAGE CASE 873A-03 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 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 Fref = MHz. 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 configurations 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, enabling the PLL to recover to normal operation. The MPC9653A is fully V compatible and requires no external loop filter components. The inputs except 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 MPC9653A outputs can drive one or two traces giving the devices an effective fanout of The device is packaged in a 7x7 mm2 32-lead LQFP package. Freescale Semiconductor, Inc., All rights reserved. PCLK & Ref VCO 1 PLL1 200-500 MHz FB_IN PLL_EN VCO_SEL BYPASS MR/OE 25 k Note PLL will lock 145 MHz Figure MPC9653A Logic Diagram GND Q0 VCC QFB GND PLL_EN BYPASS VCO_SEL 24 23 22 21 20 19 18 17 MPC9653A 12345678 Q5 VCC Q6 GND Q7 VCC MR/OE PCLK PCLK FB_IN VCC_PLL Figure MPC9653A 32-Lead Package Pinout Top View MPC9653A 2 Advanced Clock Drivers Device Data Freescale Semiconductor Table Pin Configuration Type

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Freescale Semiconductor Technical Data

V 1:8 LVCMOS PLL Clock Generator

MPC9653A

The MPC9653A is a 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 V LVCMOS 1:8 PLL CLOCK GENERATOR
• 1:8 PLL based low-voltage clock generator
• Supports zero-delay operation
• V power supply
• Generates clock signals up to 125 MHz
• PLL guaranteed to lock down to 145 MHz, output frequency = 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

Functional Description

FA SUFFIX 32-LEAD LQFP PACKAGE

CASE 873A-03

AC SUFFIX 32-LEAD LQFP PACKAGE

Pb-FREE PACKAGE CASE 873A-03

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 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 Fref = MHz.

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 configurations 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, enabling the PLL to recover to normal operation.

The MPC9653A is fully V compatible and requires no external loop filter components. The inputs except 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 MPC9653A outputs can drive one or two traces giving the devices an effective fanout of The device is packaged in a 7x7 mm2 32-lead LQFP package.

Freescale Semiconductor, Inc., All rights reserved.

PCLK
& Ref

VCO 1

PLL1
200-500 MHz

FB_IN

PLL_EN

VCO_SEL

BYPASS MR/OE 25 k

Note PLL will lock 145 MHz

Figure MPC9653A Logic Diagram

GND Q0 VCC

QFB GND PLL_EN BYPASS VCO_SEL
24 23 22 21 20 19 18 17

MPC9653A
12345678

Q5 VCC Q6 GND Q7 VCC MR/OE PCLK

PCLK

FB_IN

VCC_PLL

Figure MPC9653A 32-Lead Package Pinout Top View

MPC9653A 2

Advanced Clock Drivers Device Data Freescale Semiconductor

Table Pin Configuration

Type

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Datasheet ID: MPC9653AAC 635587