| 摘要 |
<p>Circuitry within a device provides an output signal to an output pad (23) of the device. One of a plurality of current levels is selected by a mode input (41). When a first current level is selected, the circuitry (33, 34) generates only a first amount of current to maintain the output signal on the output pad. When a second current level is selected, the circuitry (50, 51), in addition to the first amount of current, generates a second amount of current to maintain the output signal on the output pad. The first current level may be used in a test mode. In this way high current switching noise can be eliminated during testing. The second current level may then be used in a normal operating mode.</p> |
