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The MM5450 and MM5451 are monolithic MOS integrated circuits utilizing N-channel metal-gate low threshold, enhancement mode, and ion-implanted depletion mode devices. They are available in 40-pin molded or cavity dual-in-line packages. The MM5450/MM5451 is designed to drive common anode-separate cathode LED displays. A single pin controls the LED display brightness by setting a reference current through a variable resistor connected to VDD.