| 摘要 |
PURPOSE:To automatically perform the discrimination of variety by beforehand incorporating a circuit in a chip and putting the specific output terminal to a high level only when the combination of specific high and low levels is applied to input terminal groups. CONSTITUTION:A variety discrimination circuit 4 is constituted like (a)-(h), and circuits of (a)-(h) are respectively disposed to each variety. With the integrated circuit constituted in this way, an output terminal 5 rises to a high level only when all of the input terminal i1, i2, i3 lower to a low level. Namely, the low level 0 and high level 1 are applied successively to i1, i2, i3, and the kind of the integrated circuit can be discriminated from the combination of the levels of i1-i3 when the rise of the terminal 5 to a high level is observed. By the incorporation of such means, in the discrimination of variety the limits for the combinations of the varieties on wafers and the positions of placing variety are eliminated and the discrimination of variety is executed with a tester alone. |
