LED Display Driver
MM5450/51
LED Display Driver
Features
• Continuous Brightness Control • Serial Data Input • No Load Signal Requirement ...
Description
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 ...
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