Patent ID: 8493809
Filing Date: 2013-07-23
Classification: G11C

Abstract:
1. A refresh control circuit for activating a plurality of bank selection signals in response to a refresh command signal, each of the plurality of bank selection signals being assigned to one of a plurality of bank groups, wherein the refresh control circuit is configured to activate the plurality of bank selection signals when a refresh cycle selection signal is deactivated, and activate a part of the plurality of bank selection signals when the refresh cycle selection signal is activated, wherein the refresh control unit comprises: a first control pulse output group configured to output a plurality of first control pulse signals which are selectively activated in response to the refresh command signal, the refresh cycle selection signal, and the counting flag signal; a second control pulse output group configured to output a plurality of second control pulse signals which are selectively activated in response to the refresh command signal, the refresh cycle selection signal, and an inversion signal of the counting flag signal; and a pulse output section configured to output the plurality of bank selection signals which are activated corresponding to activation time points of each of the plurality of first and second control pulse signals.