Microchip Technology MM5451
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.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
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