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1. 发明专利

JPH06111597A SEMICONDUCTOR MEMORY DEVICE 失效
公开(公告)号：JPH06111597A
公开(公告)日：1994-04-22
申请号：JP25505892
申请日：1992-09-24
申请人： NEC CORP
发明人： ITO MUNEHIRO
IPC分类号： G11C11/41 , G11C8/18 , G11C11/413 , G11C29/00 , G11C29/04
摘要： PURPOSE:To activate a selected redundancy address switch at high speed and to shorten address access time by using a signal of an input side of a logic circuit as a pre-charge signal of a redundancy decoder and performing pre- charge quickly. CONSTITUTION:A redundancy decoder (RD) and address buffer groups 10, 11 specifying a reading address are provided on an information reading circuit of a buffer group 13. ATD circuits A 20 and B 21 connected to these buffer groups 10, 11 detect variation of an address signal and the outputted detected output ATDA and B are integrated by a NAND gate 23. Further, a signal of an input side of a gate 23 is used as a pre-charge signal of the RD, a transistor 52 is added in parallel to a (p) type transistor 51 of ATD input, and each input is made ATDA and B of two stages before ATD. Thereby, precharge of RD is quickly performed, the selected redundancy address switches are activated at high speed and address access time is shortened.

2. 发明专利

JP2001156608A THROUGH-CURRENT PREVENTING CIRCUIT FOR OUTPUT TRANSISTOR 失效
公开(公告)号：JP2001156608A
公开(公告)日：2001-06-08
申请号：JP33810599
申请日：1999-11-29
申请人： NEC CORP
发明人： ITO MUNEHIRO
IPC分类号： H03K17/16 , H03K19/0175
摘要： PROBLEM TO BE SOLVED: To surely prevent a through-current at application of power by adding a P-channel transistor(TR) in series to an output TR circuit. SOLUTION: The through-current preventing circuit for output transistor has two systems of power supplies; an external power supply VCC2 and an internal power supply VCC1 generated from the VCC1, a P-channel TR 17 driven by the external power supply VCC2 is inserted in series with output TRs (18, 19) of an output circuit where N-channel TRs are stacked longitudinally, the external power supply VCC2 is used for a power supply of an inverter to drive a gate of this P-channel TR, and by utilizing a difference between a rise time of the external power supply and a rise time of the internal power supply, activation of the output TR is suppressed to prevent its through-current.

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