MM5450

MM5450/51 LED Display Driver Features Continuous Brightness Control Serial Data Input No Load Signal Requirement Enable (MM5450 Only) Wide Power Supply Operation TTL Compatibility 34 or 35 Outputs, 15 mA Capability Alphanumeric Capability Applications Industrial Control Indicator Relay Driver Digital Clock, Thermometer, Counter, Voltmeter Instrumentation Readouts General Description The MM5450 and MM5451 LED display drivers are monolithic MOS IC’s fabricated in an N-Channel, metal-gate process. The technology produces low-threshold, enhancement-mode, and ion-implanted depletion-mode devices. A single pin controls the LED display brightness by setting a reference current through a variable resistor connected to the supply. Block Diagram BRIGHTNESS CONTROL OUT 34 VDD 20 24 OUT 1 18 19 35 OUTPUT BUFFERS DATA ENABLE/OUT 35 (See Note 1) SERIAL DATA 23 22 21 CLOCK 35 LATCHES LOAD 35-BIT SHIFT REGISTER RESET Note 1: Pin in Data ...