Abstract: A charging base includes: a base seat installed on a floor surface; a columnar tower part provided on the base seat; a first support provided on the tower part and capable of supporting a vertical first electric vacuum cleaner; and a second support provided on the tower part and capable of supporting a vertical second electric vacuum cleaner. An electric vacuum cleaner system includes the charging base configured as described above, the vertical first electric vacuum cleaner, and the vertical second electric vacuum cleaner.

Abstract: A charging base (400) includes: a base seat (401) installed on a floor surface; a columnar tower part (402) provided on the base seat (401); a first support (403) provided on the tower part (402) and capable of supporting a vertical first electric vacuum cleaner (100); and a second support (404) provided on the tower part (402) and capable of supporting a vertical second electric vacuum cleaner (200). An electric vacuum cleaner system 1 includes the charging base (400) configured as described above, the vertical first electric vacuum cleaner (100), and the vertical second electric vacuum cleaner (200).

Abstract: A selected static type random access memory cell changes associated bit lines between a positive high voltage level and a ground voltage level in a write-in sequence and between the positive high voltage level and a middle voltage level in a read-out sequence, and a timing controller monitors the bit lines for producing an enable signal supplied to a word line driving unit and for canceling a precharge controlling signal supplied to a pull-up/balancing unit upon arrival of either bit line at the middle voltage level, thereby preventing the static type random access memory cell from connection with the associated bit lines with a large potential difference.