One LM3914 can drive up to 10 LEDs, LCDs, or vacuum fluorescent displays on its outputs. The linear scaling of the output thresholds makes the device usable, for example, as a voltmeter. In the basic configuration it provides a ten step scale which is expandable to over 100 segments with other LM3914 ICs in series.
This IC was introduced by National Semiconductor in 1980 and is still available as of 2018 from Texas Instruments. Two variants of this part are the LM3915 with 3dB logarithmic scale steps, and the LM3916 which emulates the scale of a VU-meter .
Internally, each device contains ten comparators and a resistor scaling network, as well as a 1.25 volt reference source. As the input voltage increases, each comparator turns on. The device can be configured for either a bar-graph mode, where all lower-output terminals switch on, or "dot" mode in which only one output goes on.  The device is packaged in an 18 pin dual in-line package or in a surface mount leadless chip carrier.
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