OUTPUT BUFFER, OSCILLATING CIRCUIT, VOLTAGE GENERATING CIRCUIT, FUSE CIRCUIT, SEMICONDUCTOR STORAGE DEVICE INCLUDING THE SAME, AND LAYOUT SYSTEM AND TEST SYSTEM THEREOF

摘要

PURPOSE:To stabilize the pseudo static RAM, and to reduce energy consumption by suitably setting the refresh cycle of the pseudo static RAM at a value approaching the information holding ability of a memory cell. CONSTITUTION:The discharge current of the capacitor of an oscillating circuit such as a refresh timer circuit TMR is stabilized, and since the approximate same parasitic capacity is coupled among a polycrystal silicone resistance, the supply voltage of the circuit and a ground potential, the power source fluctuation can be offset, and the fluctuation of the oscillating frequency of the oscillating circuit caused by a power source bump, etc., can be suppressed. Further since the operational characteristics of the oscillating circuit and a refresh timer counter circuit SRC, the address dependency of the information holding characteristic of the memory cell, etc., can be efficiently tested and confirmed, the refresh cycle of the pseudo static RAM can be suitably set at the value approaching the information holding ability of the memory cell. Thus the operation of the pseudo static RAM can be stabilized, and the energy consumption can be reduced.