| 摘要 |
PURPOSE:To set output currents variably by arranging a plurality of P channel transistors and N channel transistors each connected by wirings selectively as the P channel transistors and N channel transistors constituting a CMOS output buffer. CONSTITUTION:Desired output currents can be selected by a wiring process, and the combination of P channel transistors (Pch Tr) 12-15 and N channel transistors (Nch Tr) 22-25 used as output buffers for an actual gate array can be selected freely. Only the P channel transistor such as numeral 12 is employed as the Pch Tr, and gate input terminals for other Pch Trs 13-15 are connected to the positive power terminal 40 side. On the other hand, the Nch Trs 22-24 are used and a gate input terminal for the residual Nch Tr 25 is connected to a negative power terminal 50. According to such selection, arbitrary output-buffer drive capacity can be acquired. |
