An improved programmable comparator circuit having a pair of differential inputs (VN, VP), that will, through respective identical resistor networks (16, 30, 17, 31), turn on a first current switch (22, 23) for comparing the differential of the inputs to a threshold voltage. The threshold voltage is established by the voltage created when a selected current is drawn through one of said resistor networks, such that a bias current, through one of the transistors forming the first current switch, and through a second current switch (12, 13) establishes a hysteresis current through one of the transistors forming the second current switch. Positive feed back means (28, 29, D1-D4) coupled to the output of said first current switch (22, 23) control the second current switch (12, 13).