MPC931
MPC931 is LOW VOLTAGE PLL CLOCK DRIVER manufactured by Motorola Semiconductor.
- Part of the MPC930 comparator family.
- Part of the MPC930 comparator family.
features for power conscious portable or “green” designs. The power down pin will seemlessly reduce all of the clock rates by one half so that the system will run at half the potential clock rate to extend battery life. The POWER_DN pin is synchronized internally to the slowest output clock rate. This allows the transition in and out of the power- down mode to be output glitch free. In addition, the shut down control pins will turn off various binations of clock outputs while leaving a subset active to allow for total processor shut down while maintaining system monitors to “wake up” the system when signaled. During shut down, the PLL will remain locked, if internal feedback is used, so that wake up time will be minimized. The shut down and power down pins can be bined for the ultimate in power savings. The Shut_Dn pins are synchronized to the clock internal to the chip to eliminate the possibility of generating runt pulses. The MPC930/931 devices offer a great deal of flexibility in what is used as the PLL reference. The MPC930 offers an integrated crystal oscillator that allows for an inexpensive crystal to be used as the frequency reference. For more information on the crystal oscillator please refer to the applications section of this data sheet. In those...
