MAX7219CNG LED Matrix/Digit Display Driver - MAX7219
When need some help driving a lot of LEDs, the MAX7219 is the best friend could hope for. The thing about 'plexing is that you need to use 8 power transistors (or a power register/latch, that can supply over 100mA per pin) AND have to constantly refresh the display to keep the image stable. The MAX7219 does all the control and refresh work for driving either an 8x8 matrix display or 8 x 7-segment displays (usually these also have a dot so its really an 8-segment display) - 64 LEDs total. All have to do is send it serial commands via the 4-pin SPI interface and it will auto-magically take care of the rest.
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