| 摘要 |
PROBLEM TO BE SOLVED: To suppress the coupling noise on parallel address signal lines without increasing their line capacitance, thereby realizing a low noise and high speed synchronous cash SRAM, etc. SOLUTION: The device comprises address signal lines which need drive circuit stages and are disposed at comparatively long distances wherein inverters V01-V02, V11, V21-V22, V31, V41-V42, the drive circuits, are disposed at specified spacings s with offsets of a half the spacing s between adjacent address signal lines the signal wirings of which are formed by an uppermost layer e.g. 4-layer metal wiring layer M4 and disposed e.g. at pitches 4 times a minimal wiring pitch p. Lower metal wiring layer signal lines are not disposed parallel beneath the upper most metal wiring layer signal wirings below which no shield wiring is laid. |
