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MPC9259 Datasheet(PDF) 1 Page - Motorola, Inc |
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MPC9259 Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 12 page MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order Number: MPC9259/D Rev 0, 12/2002 © Motorola, Inc. 2002 Preliminary Information 900 MHz Low Voltage LVDS Clock Synthesizer The MPC9259 is a 3.3V compatible, PLL based clock synthesizer targeted for high performance clock generation in mid-range to high-performance telecom, networking and computing applications. With output frequencies from 50 MHz to 900 MHz and the support of differential LVDS output signals the device meets the needs of the most demanding clock applications. Features • 50 MHz to 900 MHz synthesized clock output signal • Differential LVDS output • LVCMOS compatible control inputs • On-chip crystal oscillator for reference frequency generation • Alternative LVCMOS compatible reference input • 3.3V power supply • Fully integrated PLL • Minimal frequency overshoot • Serial 3-wire programming interface • Parallel programming interface for power-up • 32 Pin LQFP Package • SiGe Technology • Ambient temperature range 0°C to + 70° C Functional Description The internal crystal oscillator uses the external quartz crystal as the basis of its frequency reference. The frequency of the internal crystal oscillator or external reference clock signal is multiplied by the PLL. The VCO within the PLL operates over a range of 800 to 1800 MHz. Its output is scaled by a divider that is configured by either the serial or parallel interfaces. The crystal oscillator frequency fXTAL, the PLL feedback-divider M and the PLL post-divider N determine the output frequency. The feedback path of the PLL is internal. The PLL adjusts the VCO output frequency to be M times the reference frequency by adjusting the VCO control voltage. Note that for some values of M (either too high or too low) the PLL will not achieve phase lock. The PLL will be stable if the VCO frequency is within the specified VCO frequency range (800 to 1800 MHz). The M-value must be programmed by the serial or parallel interface. The PLL post-divider N is configured through either the serial or the parallel interfaces, and can provide one of four division ratios (1, 2, 4, or 8). This divider extends performance of the part while providing a 50% duty cycle. The configuration logic has two sections: serial and parallel. The parallel interface uses the values at the M[6:0] and N[1:0] inputs to configure the internal counters. It is recommended on system reset to hold the P_LOAD input LOW until power becomes valid. On the LOW–to–HIGH transition of P_LOAD, the parallel inputs are captured. The parallel interface has priority over the serial interface. Internal pullup resistors are provided on the M[6:0] and N[1:0] inputs prevent the LVCMOS compatible control inputs from floating. The serial interface centers on a twelve bit shift register. The shift register shifts once per rising edge of the S_CLOCK input. The serial input S_DATA must meet setup and hold timing as specified in the AC Characteristics section of this document. The configuration latches will capture the value of the shift register on the HIGH–to–LOW edge of the S_LOAD input. See the programming section for more information. The TEST output reflects various internal node values, and is controlled by the T[2:0] bits in the serial data stream. In order to minimize the PLL jitter, it is recommended to avoid active signal on the TEST output. The PWR_DOWN pin, when asserted, will synchronously divide the FOUT by 16. The power down sequence is clocked by the PLL reference clock, thereby causing the frequency reduction to happen relatively slowly. Upon de–assertion of the PWR_DOWN pin, the FOUT input will step back up to its programmed frequency in four discrete increments. This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. MPC9259 900 MHZ LOW VOLTAGE CLOCK SYNTHESIZER FA SUFFIX 32–LEAD LQFP PACKAGE CASE 873A Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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