| 摘要 |
<p>PURPOSE:To attain high speed by giving a time difference between the operation of a sense amplifier and its output changeover when only a read signal of the number of split bits among plural bits is sent to an external terminal to send only a true read signal to an output signal path. CONSTITUTION:When an address signal Ai is at a low level, an output signal of a NOR gate circuit G4 goes to a high level, the output signal of a NOR gate circuit G6 is brought into the low level, a control signal S1 reaches the high level in a comparatively fast timing to bring sense amplifiers SA0-SA7 to the operating state. In this case, sense amplifiers SA8-SA15 remain inactive and a CMOS switch circuit comprising MOSFETs Q3, Q4. In response to the output signal of an inverter circuit N9 brought into the low level with a delay, an output signal S1' of a NOR gate circuit G7 changes from the low level to the high level. Thus, the MOSFETs Q1, Q2 are turned on with a delay and an output signal of the sense amplifiers is sent to external terminals D0-D7.</p> |
