Explore LM3914 pins, signal names, electrical functions and connection guidance for each package.
Select a pin to explore its connection
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Current-regulated cathode driver for indicator 1. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Common supply and signal return.
Connect to GND.
Use exact package pin mapping; PLCC numbering differs from DIP.
Positive supply for the analog circuitry.
Connect to regulated +5 V with local bypass.
Use exact package pin mapping; PLCC numbering differs from DIP.
Bottom of the ten-step resistor ladder.
Connect to GND for a zero-based scale.
Use exact package pin mapping; PLCC numbering differs from DIP.
High-impedance measured signal, compared with the ladder taps.
Apply a signal between ground and the reference full scale.
Normal measurement input must stay within V+−1.5 V. Protection ratings are not measurement ranges.
Top of the ten-step resistor ladder.
Connect to REFOUT in this example.
Use exact package pin mapping; PLCC numbering differs from DIP.
Adjustable reference output; loading this pin also programs LED current.
Join RHI; connect 2.49 kΩ to GND for approximately 6 mA per LED.
Use exact package pin mapping; PLCC numbering differs from DIP.
Reference adjustment return.
Connect to GND for the nominal 1.25 V reference.
Use exact package pin mapping; PLCC numbering differs from DIP.
Selects bar or dot display; also supports cascading.
Connect to V+ for bar mode. Leave open for the single-chip dot example.
Do not simply ground MODE: pulling it far below the LED supply can disable LED10.
Current-regulated cathode driver for indicator 10. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 9. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 8. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 7. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 6. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 5. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 4. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 3. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
Current-regulated cathode driver for indicator 2. Current flows into this pin when active.
Connect the LED cathode here and its anode to the positive LED supply.
Check total package dissipation when many LEDs are lit.
No internal electrical connection in the PLCC package.
Leave unconnected.
No internal electrical connection in the PLCC package.
Leave unconnected.
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