MPC990

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Low Voltage PLL Clock Driver The MPC990/991 is a 3.3V compatible, PLL based ECL/PECL clock driver. The fully differential design ensures optimum skew and PLL jitter performance. The performance of the MPC990/991 makes the device ideal for Workstation, Mainframe Computer and Telecommunication applications. The MPC990 and MPC991 devices are identical except in the interface to the reference clock for the PLL. The MPC990 offers an on–board crystal oscillator as the PLL reference while the MPC991 offers a differential ECL/PECL input for applications which need to lock to an existing clock signal. Both designs offer a secondary single–ended ECL clock for system test capabilities. MPC990 MPC991 LOW VOLTAGE PLL CLOCK DRIVER Fully Integrated PLL Output Frequency Up to 400MHz ECL/PECL Inputs and Outputs Operates from a 3.3V Supply Output Frequency Configurable TQFP Packaging ±50ps Cycle–to–Cycle Jitter The MPC990/991 offers three banks of outputs which can each be FA SUFFIX programmed via the the four fsel pins of the device. There are 16 different 52–LEAD TQFP PACKAGE output frequency configurations available in the device. The CASE 848D–03 configurations include output ratios of 1:1, 2:1, 3:1, 3:2, 4:1, 4:3, 4:3:1 and 4:3:2. The programming table in this data sheet illustrates the various programming options. The SYNC output monitors the relationship between the Qa and Qc output banks. The output pulses per the timing diagram...