Patent ID: 7031216

Claim:
A refresh controller comprising a first element, a second element, and a third element, and outputting a first bank enable signal, a second bank enable signal, and a delayed refresh enable signal in response to a bank enable signal and a refresh enable signal, comprising: a first delay unit for outputting a second bank enable signal by delaying a first bank enable signal when a delayed refresh enable signal is active and outputting the bank enable signal as the second bank enable signal when the delayed refresh enable signal is inactive; a second delay unit for allowing a delayed bank enable signal to be in an enable state when the first bank enable signal or the second bank enable signal is active and allowing the delayed bank enable signal to be in a disable state when the first and second bank enable signals are inactive; and a latch for outputting the delayed refresh enable signal using a refresh enable signal when the delayed bank enable signal is inactive and maintaining a logical state of the delayed refresh enable signal outputted when the delayed bank enable signal is active.