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The CAT4008 is an eight-channel, constant-current-sink LED driver for billboard, marquee, instrument and other large, general-purpose LED displays. The LED channels can operate with an output voltage on the LED pins as low as 0.4V - for a 2 to 100mA LED current - to enable more power-efficient designs. The nominal LED current is set by an external resistor. A high-speed, four-wire serial interface with up to 25MHz clock frequency controls each of the eight channels using a shift register and latch configuration. A serial output data pin allows multiple devices to be cascaded and programmed via one serial interface. All channels can be disabled independently.