Staas & Halsey
Range checking comparator
 A comparator includes a first terminal, a second terminal, a first flip-flop circuit which inverts when the voltage applied to the first terminal becomes larger by .DELTA.V.sub.1 than the voltage applied to the second terminal, a third terminal, a fourth terminal, and a second flip-flop circuit which inverts when the voltage applied to the third terminal becomes smaller by .DELTA.V.sub.2 than the voltage applied to the fourth terminal. The comparator further includes a first switching circuit and a second switching circuit which, respectively, connect the first terminal and the fourth terminal to a voltage source to be compared, a third switching circuit and a fourth switching circuit which connect the second terminal and the third terminal to a reference voltage source. Also included is a fifth switching circuit which is commonly connected to the first flip-flop circuit and the second flip-flop circuit. 
Fujitsu Limited
H H
H03K H03K
inventional inventional
Yasuo Yoshihiro
Suzuki Takemae