The 5481 is a monolithic MOS integrated circuit utilizing Nchannel metal gate low threshold enhancement mode and ion-implanted depletion mode devices It utilizes the MM5450 die packaged in a 20-pin package making it ideal for a 2 digit display The MM5481 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 either to VDD or to a separate supply of 11V maximum