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Refresh control device

a control device and control device technology, applied in the direction of digital storage, generating/distributing signals, instruments, etc., can solve the problems of data damage, word line disturbance, and data damage of memory cells, and achieve the effect of reducing the failure of refresh

Active Publication Date: 2018-03-29
SK HYNIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]Various embodiments are directed to a refresh control device capable of generating a row hammer address through a plurality of oscillators having different cycles, thereby reducing a refresh fail.

Problems solved by technology

However, the above-described increase in coupling effect between adjacent word lines may damage data of a memory cell coupled to a word line adjacent to a word line which is frequently activated.
Word line disturbance may damage data of a memory cell before the memory cell is refreshed.

Method used

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Embodiment Construction

[0022]Hereinafter, a refresh control device according to the present disclosure will be described below with reference to the accompanying drawings through exemplary embodiments.

[0023]FIG. 1 is a diagram for describing word line disturbance, illustrating a part of a cell array included in a memory device.

[0024]In FIG. 1, ‘WLK’ represents a word line which is frequently activated, and ‘WLK−1’ and ‘WLK+1’ represent word lines adjacent to the word line WLK. Furthermore, ‘CELL_K’ represents a memory cell coupled to the word line WLK, ‘CELL_K−1’ represents a memory cell coupled to the word line WLK−1, and ‘CELL_K+1’ represents a memory cell coupled to the word line WLK+1. The memory cells include cell transistors TR_K, TR_K−1 and TR_K+1 and cell capacitors CAP_K, CAP_K−1 and CAP_K+1, respectively.

[0025]In FIG. 1, when the word line WLK is activated or deactivated, a coupling effect may occur between the word line WLK and the word lines WLK−1 and WLK+1, thereby affecting charges of the ce...

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Abstract

A refresh control device may include a first oscillator configured to generate a first oscillation signal, a second oscillator configured to generate a second oscillation signal having a different cycle from the first oscillation signal, a first address controller configured to latch an address in response to the first oscillation signal, and output the latched address when a refresh signal is enabled. The refresh control device may also include a second address controller configured to latch the address in response to the second oscillation signal, and output the latched address when the refresh signal is enabled. Further included may be a selector configured to select any one of the output of the first address controller and the output of the second address controller in response to a select signal, and output the selected output as a row hammer address.

Description

CROSS-REFERENCES TO RELATED APPLICATION[0001]The present application claims priority under 35 U.S.C. § 119(a) to Korean application number 10-2016-0123184, filed on Sep. 26, 2016, in the Korean Intellectual Property Office, which is incorporated herein by reference in its entirety.BACKGROUND1. Technical Field[0002]Various embodiments relate to a refresh control device, and more particularly, to a technique for overcoming row hammering.2. Related Art[0003]With the increase in integration density of memories, a pitch between word lines included in a memory has been reduced. The reduction of the pitch between word lines has increased a coupling effect between adjacent word lines.[0004]Whenever data is inputted to or outputted from a memory cell, a word line toggles between an active state and an inactive state. However, the above-described increase in coupling effect between adjacent word lines may damage data of a memory cell coupled to a word line adjacent to a word line which is fre...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11C11/406G06F1/24G06F1/08
CPCG11C11/40615G06F1/08G06F1/24G11C11/406G11C11/40611G11C11/40618G06F2212/7211
Inventor KIM, DAE SUKKIM, JAE IL
Owner SK HYNIX INC
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