LM311P听说是个集成块？

The LM111, LM211, and LM311 are single high-speed voltage comparators. These devices are designed to
operate from a wide range of power-supply voltages, including ±15-V supplies for operational amplifiers and
5-V supplies for logic systems. The output levels are compatible with most TTL and MOS circuits. These
comparators are capable of driving lamps or relays and switching voltages up to 50 V at 50 mA. All inputs and
outputs can be isolated from system ground. The outputs can drive loads referenced to ground, VCC+ or VCC–.
Offset balancing and strobe capabilities are available, and the outputs can be wire-OR connected. If the strobe
is low, the output is in the off state, regardless of the differential input.

就是一高速电压比较器，输出兼容TTL，COMS电平。输入电压范围宽。