TRAS adjusting circuit for self-refresh mode in a semiconductor device

摘要

A tRAS adjusting circuit extends an active operation in a self-refresh operation. The tRAS adjusting circuit includes: a self-refresh sensing unit for receiving a self-refresh signal and a refresh signal and generating a sensing signal; a first extension unit for extending an enable interval of an active operation pulse; a second extension unit for extending an enable interval of an output signal of the first extension unit; a transfer unit for transferring either the output signal of the first extension unit or an output signal of the second extension unit as a tRAS signal according to an enable state of the sensing signal; and an active signal output unit for receiving the active operation pulse and tRAS signal and outputting an enable state of the active operation pulse as an active signal until the tRAS signal is disabled.