LM3914 IC Dot/Bar Display Driver


The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V.
The LM3914 is rated for operation from 0°C to +70°C. The LM3914N-1 is available in an 18-lead PDIP (NFK) package.

Drives LEDs, LCDs or Vacuum Fluorescents
Bar or Dot Display Mode Externally Selectable by User
Expandable to Displays of 100 Steps
Internal Voltage Reference from 1.2V to 12V
Operates with Single Supply of Less than 3V
Inputs Operate Down to Ground
Output Current Programmable from 2 mA to 30 mA
No Multiplex Switching or Interaction Between Outputs
Input Withstands ±35V without Damage or False Outputs
LED Driver Outputs are Current Regulated, Open-collectors
Outputs can Interface with TTL or CMOS Logic
The Internal 10-step Divider is Floating and can be Referenced to a Wide Range of Voltages

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