| 摘要 |
PURPOSE:To install external terminals for an internal monitor almost without increasing power consumption at the time of practical operation by controlling the base potential of an emitter follower transistor via a diode, from a second external terminal. CONSTITUTION:The output of an emitter follower transistor 11 constituting an ECL circuit of an internal circuit 1 is connected with the base of an emitter follower transistor 13, via a resistor 12 of an external circuit 2, and the emitter follower transistor 13 drives a first external terminal 3. The cathode of a diode 14 is connected with the base of an emitter follower transistor 13, and the anode of the diode 14 is connected with a second external terminal 4. When an external terminal 4 is set at a potential equal to or lower than the emitter potential of the transistor 11 of the internal circuit 1, the external terminal 8 can be used as a monitor terminal. When the external terminal 4 is grounded, the external terminal 3 is fixed at a high potential. |
