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Sep 26, 2006 The LM111, LM211, LM311 are voltage comparators that have low input currents. They are also designed to operate over a wide range of supply voltages: from standard 15V operational amplifier supplies down to the single. +5V supply used for IC logic. Their output is compatible with RTL-DTL and TTL. The ability to operate from a single power supply of 5.0 V to 30 V or. $15 V split supplies, as commonly used with operational amplifiers, makes the LM211/ LM311 a truly versatile comparator. Moreover, the inputs of the device can be isolated from system ground while the output can drive loads referenced either to ground, The LM311 performs like a free running multivibrator with high duty cycle. The IC is designed to operate from a stan- dard single 5 volt supply and has a high output current capability for driving the switching transistor Q2. The duty cycle is given by the voltage divider R3 and R4 and the frequency of C1 in conjunction with R5 2017 6 29 LM311 -MIL . . 15V . 5V . TTL MOS comparator, the LM311 , has a response time of 200 us. Also the output of an operational ampli er is not readily matched to standard logic levels. Without external clamping or level- shifting, an op amp operating as a comparator will swing to within a few volts of the positive and negative supplies, which is incom- patible with