| 摘要 |
PURPOSE:To enable checking of all of desired tests at a stage when products are delivered from a manufacturer, by a method wherein it is previously tested whether or not a driver of a P-PROM has an ability to absorb a writing current. CONSTITUTION:A P-ROM has several output terminals and a terminal, wherethrough a writing current flows, is combined with the output terminal, which is utilized for testing an ability for a driver, selected by a decoder, to absorb a current by a method wherein a current, having no possibility of simultaneously writing a memory cell, is caused to flow from each output terminal to the memory cell connected to each output terminal selected by a decoder. Thus, it can be tested whether or not the driver has an ability to absorb a writing current without destroying the memory cell, and all of the desired tests can be checked at a stage when poducts are delivered from the manufacturer. |
