| 摘要 |
<p>A circuit for use with interface systems for providing a threshold setting function wherein the system can be made to interface with T2L or CMOS logic with either 5 or 15 volt power supply capabilities. The circuit comprises a pair of matched resistors (18, 20) coupled in series to one another. The first one of the resistors (18) is returned to a select terminal (16) via a first pair of diodes (12, 14). The second resistor (20) is returned to a terminal at which may be supplied a ground reference potential (26) via a second pair of diodes (22, 24). A source of current (28) is provided that is coupled to the interconnection of the second resistor with the second pair of diodes. A treshold output is provided to the interface system at the interconnection between the serially connected resistors.</p> |
