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    • 4. 发明授权
    • Semiconductor device using complementary clock and signal input state
detection circuit used for the same
    • 半导体器件采用互补时钟和信号输入状态检测电路相同
    • US6104225A
    • 2000-08-15
    • US76810
    • 1998-05-13
    • Masao TaguchiYasurou MatsuzakiMiki Yanagawa
    • Masao TaguchiYasurou MatsuzakiMiki Yanagawa
    • G11C7/22H03K5/00H03K5/135H03K5/151H03L7/081G06F1/04
    • H03L7/0805G11C7/22G11C7/222G11C7/225H03K5/135H03K5/151H03K2005/00234H03L7/0814
    • A semiconductor device for generating first and second internal clocks complementary with each other from an external clock and usable for both a system of a type using a complementary clock and a system of a type generating a 180.degree. phase clock internally, is disclosed. A first clock input circuit (buffer) is supplied with a first external clock and outputs a first internal clock. A second clock input circuit (buffer) is supplied with a second external clock complementary with the first external clock and outputs a second clock. A 1/2 phase clock generating circuit generates a 1/2 phase shift signal 180.degree. out of phase with the first internal clock. A second external clock state detection circuit judges whether the second external clock is input to the second clock input buffer. A switch is operated to produce the second clock as the second internal clock when the second external clock is input and to produce the 1/2 phase shift signal as the second internal clock when the second external clock is not input, in accordance with the judgement at the second external clock state detection circuit.
    • 公开了一种半导体器件,用于从外部时钟产生彼此互补的第一和第二内部时钟,并且可用于使用互补时钟的系统和内部产生180°相位时钟的系统的系统。 第一时钟输入电路(缓冲器)被提供有第一外部时钟并输出第一内部时钟。 第二时钟输入电路(缓冲器)被提供有与第一外部时钟互补的第二外部时钟并输出第二时钟。 A + E,fra 1/2 + EE相位时钟发生电路产生与第一内部时钟异相180°的+ E,fra 1/2 + EE相移信号。 第二外部时钟状态检测电路判断第二外部时钟是否被输入到第二时钟输入缓冲器。 当第二外部时钟被输入时,开关被操作以产生第二时钟作为第二内部时钟,并且当第二外部时钟未被输入时产生+ E,fra 1/2 + EE相移信号作为第二内部时钟 ,根据第二外部时钟状态检测电路的判断。