MM5450/51 LED Display Driver Features General Description Continuous Brightness Control The MM5450 and MM5451 LED display drivers are monolithic MOS ICs fabricated in an N-Channel, Serial Data Input metal-gate process. The technology produces No Load Signal Requirement low-threshold, enhancement-mode, and ion-implanted Enable (MM5450 Only) depletion-mode devices. Wide Power Supply Operation A single pin controls the LED display brightness by TTL Compatibility setting a reference current through a variable resistor 34 or 35 Outputs, 15 mA Capability connected to the supply. Alphanumeric Capability Applications Industrial Control Indicator Relay Driver Digital Clock, Thermometer, Counter, Voltmeter Instrumentation Readouts Block Diagram OUT 34 OUT 1 VDD 20 24 18 BRIGHTNESS CONTROL 19 35 OUTPUT BUFFERS LOAD 35 LATCHES 23 DATA ENABLE/OUT 35 (See Note 1) 22 35-BIT SHIFT SERIAL DATA REGISTER RESET RESET 21 CLOCK (only available 1 in die form) Note 1: Pin in Data Enable in MM5450 Pin in Output 25 in MM5451 2016 Microchip Technology Inc. DS20005651A-page 1OUTPUT BIT 34 OUTPUT BIT 35 ENABLE DATA CLK V DD BRIGTNESS CONTROL RESET OUTPUT BIT 1 OUTPUT BIT 2 MM5450/51 Connection Diagram: Die OUTPUT BIT 12 OUTPUT BIT 24 OUTPUT BIT 11 OUTPUT BIT 25 OUTPUT BIT 10 OUTPUT BIT 26 OUTPUT BIT 9 OUTPUT BIT 27 OUTPUT BIT 8 OUTPUT BIT 28 OUTPUT BIT 7 OUTPUT BIT 29 MM5450/5451 DIE PINOUT V V SS SS OUTPUT BIT 6 OUTPUT BIT 30 OUTPUT BIT 5 OUTPUT BIT 31 OUTPUT BIT 4 OUTPUT BIT 32 OUTPUT BIT 3 OUTPUT BIT 33 DS20005651A-page 2 2016 Microchip Technology Inc. OUTPUT BIT 13 OUTPUT BIT 14 OUTPUT BIT 15 OUTPUT BIT 16 OUTPUT BIT 17 V SS OUTPUT BIT 18 OUTPUT BIT 19 OUTPUT BIT 20 OUTPUT BIT 21 OUTPUT BIT 22 OUTPUT BIT 23