The LM111-N, LM211-N and LM311-N are voltage comparators that have input currents nearly
a thousand times lower than devices like the LM106 or LM710. They are also designed to operate over
a wider range of supply voltages: from standard ±15V op amp supplies down to the single 5V supply
used for IC logic. Their output is compatible with RTL, DTL and TTL as well as MOS circuits.
Further, they can drive lamps or relays, switching voltages up to 50V at currents as high as 50
Both the inputs and the outputs of the LM111-N, LM211-N or the LM311-N can be isolated
from system ground, and the output can drive loads referred to ground, the positive supply or the
negative supply. Offset balancing and strobe capability are provided and outputs can be wire OR'ed.
Although slower than the LM106 and LM710 (200 ns response time vs 40 ns) the devices are also much
less prone to spurious oscillations. The LM111-N has the same pin configuration as the LM106 and
The LM211-N is identical to the LM111-N, except that its performance is specified over a
−25°C to +85°C temperature range instead of −55°C to +125°C. The LM311-N has a temperature range of
0°C to +70°C.
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